238 Royalty-Free Audio Tracks for "Reduced"

Livery Stable Blues by the Original Dixieland Jass Band, recorded 26 February 1917. It was released on the Victor label on 7 March 1917, and was the first released jazz recording. 78 RPM, transferred to .ogg from a .mp3 file from The Internet Archive. This version has been edited to reduce the hiss. Українська: «Livery Stable Blues» від «Ориджінал диксиленд джаз-банд», записаний 26 лютого 1917 року, перший випущений джазовий запис.

The symmetry of Webern's tone row from Variations, Op. 30, is apparent from the equivalent, P1=IR1 and R12=I12, and thus reduced number of row forms, two, P and R, plus transpositions. Consisting of three related tetrachords: a and c consisting of two minor seconds and one minor third and b consisting of two minor thirds and one minor second. Notes 4-7 and 6-9 also consist of two minor seconds and one minor third. Created by Hyacinth (talk) 23:25, 19 October 2010 using Sibelius 5.

This sound is created with two sounds that i recorded at the university. First, the sound of the zip of the pocket and then the falling keys sound. First of all, i cut the two fragment,from two different track, that i wanted for my mix. After, i first worked on the zip sound, which was pretty bad recorded but, after reduced noises, all seemed better ! i made the same thing for the other sound, the falling keys one. Then i ad the last one at the end of the first one, mix a little bit to make the two sounds seemed natural together. After, i normalized the track. At the end, i saved and export my track !.

I accidentally recorded this sequence when i left my camcorder on while filming some drawing tutorials. My warehouse style studio is in the inner city at street level opening onto a street closure/park so you will hear some faint bird tweeting in the background. Near the beginning and end there is the sound of a large industrial sliding door and the loud clanging is a drop bolt on an external metal security grill gate. Wind blown chimes add to the scene. I only applied a very low level audio clean-up using adobe soundbooth cs3 to reduce hiss.

Snippets from recordings of me playing the tanpura. The strings are tuned to b, d, g and e, so would work well in the keys of g or e minor. I noticed that my first pack of tanpura samples has a bit of fuzzy white noise so in this pack i have equalized - i reduced all the very high frequencies which got rid of most of the white noise without affecting the low frequency sounds of the tanpura itself. Please note this is the tanpura part of an instrument called the swar sangam which combines the swarmandal (indian harp) and the tanpura, it is not a traditional tanpura and does sound slightly different.

It's a recording of over 100 people watching a football match (poland-greece @ uefa euro 2012). Recorded in a medium-sized hall. You can hear the sport live commentary broadcasted from television, people expressing their emotions with their voices. Clapping their hands, cheering their team (poland) and generally making a lot of interesting noises as they watch the game. Recorded with zoom h2 in 2-channel surround mode. Originally 24-bit wav, normalized and converted to 24-bit flac with audacity. I have reduced the mic gain at 0:56 to ensure i will not have a clipped recording. I didn't edit the result to let you cut-out whatever you may need.

A request for freesounder neilreynolds1980, intended as a soundtrack for the play dr faustus at the point the eponymous character is sucked into hell. A bit of technical information: the basic sound is a stacked set of ‘devil’s intervals’ (augmented fourths) with doubling at the octave, playing an instance of calf organ set to a truly horrifying demonic choir patch i created. The rest of the effects are accomplished using automation of this instrument as well as calf pulsator and calf filter in ardour. This sounds much better when downloaded than it does in the freesound player. The stereo image and sample rate are much reduced in the version you hear in the player.

Recorded a short drum and bass loops at 120-bpm using ableton live 9. 4 notes per bar played on bass in this order: a1 f1 c2 g1. This recording is designed for a mid-range frequency instrument, like a guitar, over the loop. Mid range frequencies are reduced to allow space for a guitar, vocals, etc. Additional notes:-15. 2 lufs integrated-1. 0 db true peak max. Want something more customized? send me a note or visit my youtube. Com/bainmackhope this helps and is useful for your next project. Cheers,bainmack.

Recorded a short drum and bass loops at 100-bpm using ableton live 9. 4 notes per bar played on bass in this order: g1 e1 g1 e1. This recording is designed for a mid-range frequency instrument, like a guitar, over the loop. Mid range frequencies are reduced to allow space for a guitar, vocals, etc. Additional notes:-15. 9 lufs integrated-1. 1 db true peak max. Want something more customized? send me a note or visit my youtube. Com/bainmackhope this helps and is useful for your next project. Cheers,bainmack.

Elmo omnigraphic 253af slide projector, similar to a kodak s-av 2000. Turn on, slide change at 10 second intervals, turn off. Recorded on a marantz pmd 661 with a rode nt4, 250 mm above centre rear of projector, angled down at 45º. I needed this sound as part of an audio-visual that mimics a slide show. I chose to record a 10-second change interval (instead of a shorter interval) because that allows me to razor the waveform between changes, and then extend (or reduce) the time between changes. Too short a time interval between slide changes means you'd have to add motor/fan sound between every change.

Recorded a short drum and bass loops at 120-bpm using ableton live 9. 4 notes per bar played on bass in this order: e1 g1 e1 d1. This recording is designed for a mid-range frequency instrument, like a guitar, over the loop. Mid range frequencies are reduced to allow space for a guitar, vocals, etc. Additional notes:-14. 9 lufs integrated-1. 1 db true peak max. Want something more customized? send me a note or visit my youtube. Com/bainmackhope this helps and is useful for your next project. Cheers,bainmack.

Warning: careful when listening, it gets loud!. July 4th. Recorded in the midwest usa, where we adore our explosives. The omnis on my humble dr-05 did a pretty good job capturing the sheer depth of zillions of people blowing stuff up together :-). You’ll hear: people having a party in the distance, a bonfire crackling on the right, a distant train blowing its whistle, and of course a lot of explosions. A couple of the big bangs clipped, but unsurprisingly, it made no audible difference. I reduced to 48khz, 24 bit and normalized to -3. 0 db. It really wakes up when you apply some eq to your liking. But i left it as is for everybody.

Elmo omnigraphic 253af slide projector, similar to a kodak s-av 2000. Turn on, slide change at 10 second intervals, turn off. Recorded on a marantz pmd 661 with a rode nt4, horizontally 250 mm from side of projector aimed at slide entry hole. I needed this sound as part of an audio-visual that mimics a slide show. I chose to record a 10-second change interval (instead of a shorter interval) because that allows me to razor the waveform between changes, and then extend (or reduce) the time between changes. Too short a time interval between slide changes means you'd have to add motor/fan sound between every change.

This sound is completely analog. I recorded the sound of a person who was walking on the street. I chose to leave the noise of the street so that we understand that the person walks outside. I used the effect "amplification" to reduce the noise of the street and increase the sound of step. I made a fade in opening and closing, so that we have the impression that the steps are moving towards us then moves away. At the same time, i played with the pitch of the sound to accentuate this effect. Descriptif selon la typologie de schaeffer :code : x''précisions morphologie :- masse : groupe nodal / complexe- timbre harmonique : terne- grain : rugeux- allure : ne comporte pas de vibrato- dynamique : l’attaque est douce et graduelle- profil mélodique : scalaire- profil de masse : le son paraît plus calibré.

Xy stereo recording from gärdet subway station in stockholm. This focuses on an older trains doors, various steams and similar "heavy" sound elements. In post: edited in pro tools with som bass cutting (eq) and automation to make some sounds stand out but still sound realistic. Put on a light compressor and pich-shifted down some elements to give more depth. This was in someway inspired by "dead space" tram and door sounds but slightly less "massive" and haunting. Ps. There's 2 versions of this recording. The one with "nr" in the title is noise reduced so sounds like the doors and steam are somewhat separated from the background. Hope you like it.

Recording of sea undertow on the beach of formicoli, vibo valentia, calabria, italy, the 19th agust 2022 16:44. The sound was recorder with a zoom h1n with windshield at a short distance from the crashing of the waves on the beach. The waves are driven by a light, gentle wind. The sound was recorded by holding the microphone in my hand while i dived knee-deep into the water and walk, filming the crashing of the waves (also on my legs). High-frequency sound details (the foam of the sea, the impact of waves on each other, etc. ) are much more audible here. Processing:* volume adjustment;* 120hz high pass filter (to reduce low some low frequencies rumble due to the wind);* cut and crossfade to eliminate very few mechanical noise of my hand on the mic;.

As already stated, he term, "pyew!" does not refer to a funky smell. Think of it as the sound bernadette (from big bang theory) makes when she's playing video games and trying to phonetically approximate the single shot of a ray gun or laser weapon. This file contains a whopping 17 different individual sounds each separated by 3 seconds of silence, and each with a different lengths and sonic qualities. Everything you need to go totally pyew-wild!. *all sounds by realtheremin are genuine theremin recordings; they are provided dry, without effects of any kind, allowing you to add reverb, echo, pitch shifts, phlanging, etc. , and edit them in any way you choose. Every effort has been made to eliminate/reduce hum and distortion (unless intentionally noted).

Ambient sound akin to the bridge of a starship. Muted background hum with an overtone of air conditioning ducts. Pseudo-random high pitched blips occupy the soundstage. Could be used as an ambient sound loop for hi-tech / science fiction interiors such as a laboratory, a control room, or the bridge of a spacecraft. Created with two instances of flstudio 3x osc. One kicking out a pair of sinewaves plus noise for the background susurus (hum) and ventilation sound. Second 3x osc is set to produce two interfereing square waves for the blips, squeaks and buzzes. The background was notch filtered and bandpassed to mellow out the humming sound and reduce hiss. The blips were processed with flstudio equo, stereo enhance, fruity delay2 and fl pan-o-matic vst. Each blip was pasted by hand in a seemingly random but not too unpleasant pattern.

A second attempt at recording the deep mud i keep finding myself walking through each morning on walthamstow marshes. This recording was made using a sound devices mixpre6ii and a stereo pair of fel em172 mics (connected to a bent wire clothes hanger and positioned about 30cm above my feet). Processing: normalize -1. 0db, low cut filter 100hz, minor noise reduction to reduce background traffic/train noise. I do not require any credit or attribution. If any of these sounds have been of help, and you are feeling charitable, please do consider donating to freesound to help keep the site running (a link is also on the home page). Any donations are greatly appreciated!.

This is a first in a series of loops made with the x-base09 drum-kit i have posted long time ago, i thought this would be a nice addition. Loops will be mainly processed in live9. Information will be available depending on the loop. This loop is a dry unprocessed loop, all i did was reduce the release on one of the kicks, as it has a long delay, and i didn't want that in the background of this loop, some midi velocity on the hi-hats, and i added a groove (chachacha) with only 10% quantization. This first loop was mainly to show the original sound of the individual hits as they where recorded, playing as a loop to give you a better picture of the sounds and therefore i added it to the x-base kit instead of x-base loop pack.

Soundscape of a city street in chicago during winter. Sunday, january 31st 2016 at 6:05pm. Continual planes, trains, and cars passing. Occasional pedestrians. Cta "l" trains audible at the nearby thorndale red line stop. Mic: core sound tetramicrecorder: zoom f8. Converted to b format using vvtetravst, then processed to stereo as wide cardioids at + and - 45 degrees using ambisonics toolkit (atk). Light noise reduction applied using izotope rx 7 spectral de-noise. High pass filter applied to reduce low end rumble. Some editing done to remove wind buffeting. Please note that this is a 48k 24bit flac file - flac files can be easily read and converted by audacity [https://www. Audacityteam. Org/] and reaper [http://reaper. Fm/], among others.

Snippets from recordings of me playing the tanpura. Tuned to e flat, the notes from top to bottom are b flat, e flat, c, low e flat. In traditional indian tuning the root note in the scale is referred to as sa and is e flat in this scale the fifth note (b flat in this scale) is referred to as pa and the sixth note (c) is dha. I noticed that my first pack of tanpura samples has a bit of fuzzy white noise so in this pack i have equalized - i reduced all the very high frequencies which got rid of most of the white noise without affecting the low frequency sounds of the tanpura itself. Please note this is the tanpura part of an instrument called the swar sangam which combines the swarmandal (indian harp) and the tanpura, it is not a traditional tanpura and does sound slightly different.

A reduced amplitude version so that it doesnt blow your cotton socks off!. Quite short, 20 seconds long and good quality. Recorded using tascam dr-05 inside my hooded jumper sleeve, still quite crisp sounding. This ones on the house, minimum effort required to capture this, and i'm sure many people would be able to capture the same thing with varying degrees of quality. ** thank you for checking my work out, if you're digging it, it would mean the world to me if you could drop foolboymedia a like on. Facebook. Com/foolboymedia. If you want to use commercially, please get in touch or consider a donation to myself on foolboymedia@gmail. Com or donating to the freesound project. Thanks for stopping by!. Again, thanks for downloading my work and using it for your project! **.

Made in ableton live this time, it is a multilayered loop consisting of recordings of an ak47, a 30 caliber 1918, and an m60 machine gun to make a rediculous powerful sound. A very short clicky kick drum with the high end reduced is added before the initial gunshot to make it punch more, otherwise it would sound weaker. There are two mechanical bolt sounds, one covering the upper mid range, and the other covering the extreme highs. Shell ejections and two reverb tails were mixed in at the end with some simple automated panning to make it move around the stereo field. The tempo slowly decreases to simulate barrel heating. Lots of processing. The layers were eq'ed, then ran into a software amp that is gently distorting the low and mid range. Then smashed together with ott multiband upward/downward compression to bring out the details. A maximizer was used to bring up the loudness some. Enjoy.

Este audio es un trabajo de clase en el cual tenemos que producir y editar un sonido con un objeto común. Para este caso, se ha utilizado una moneda. En este tercer audio, el sonido es de una moneda rebotando en la mesa. Después, el audio se editó con audacity. En este programa edité el sonido con efectos como cambio de tono, ralentizar la velocidad y estiramiento deslizante. This audio is a class´s homework where we have to produce and edit a sound with a common object. In this case, it has used a coin. In this third audio, the sound is a coin that it was bouncing on the table. After, the audio edited it with audacity. In this programme, i edited this sound with a lot of effects like modulate, reduce the speed and extend the sound.

Welcome to the asylum !this creepy sound is the recording sound of laughts that i cut to work with other sound to immerse us in a creepy atmosphere of mental asylum. I transformed the laughs in tears by reducing speed, and a delay to add an effect of inaccuracy. Typologie (cf. P. Schaeffer):v = continu variéc’est un groupe de son nodalla timbre harmonique de ce son est métallique,la microstructure du son peut être associé à un son étrange , déstabilisant. Le grain du son est à la fois lisse et rugueux. Le son comporte de vibrato notamment dans la voix. L’attaque du son est assez douce pour ensuite laisse place à des sons plus fort. C’est une dynamique graduelle. Le son possède des variations en forme d’escalier. Profil de masse : site.

This sample is a vocal "arh" sound, pitch d. It was created by singing "arh" into a dynamic microphone, with pop-screen and recording, through an e-mu 1820, into cakewalk music creator pro version 2. The sample was then roughly trimmed. The sample was then imported into wavelabs lite where the dc off set was removed, the sample was normalized and the trimmed exactly. This sample was then imported back into cakewalk music creator pro version 2, compressed slightly, then duplicated 5 times. Each of these duplications was given slightly different attack and release times, different pan and different eqs. 1 sample was given a multiple voice chorus\flanger effect and another auto-pan. A 6 sample was then added before the main sample, with reduced gain. This sample has increasing volume envelope and "moving" pan envelope. All 6 samples where sent to the same master out where "chapel" style re-verb and compression was applied. The mix down from this was then imported into wavelad lite, dc off set removed and normalized.

This underwater breathing was created in audacity. To create this sound i generated 2 tracks rhythms on 2 different mono tracks. For the breathing i created a rhythm "click noise" and added the effect "paulstrech". I deleted some moments of silences. I tried to simulate a heartbeat. I generated a rhythm tracks "noise click" and added the effect "echo". I selected in the track a sound wich looks like to a beat, cut the remain and add the repeated effect on the selected moment. I added bass to make the son more organic and reduced the gain. ---. Typologie/morphologie de shaeffer. Ce son est un mélange de continu complexe (x) et d'itération complexe (x''). Masse :son cannelé. Mélange de sons complexes avec des hauteurs. Grain : a la fois rugueux (la respiration) mais aussi lisse (les battements de cœur). Dynamique :l'attaque est plus ou moins violente avec des variations. Profil mélodique :variation scalaire.

Recorded with tascam dr-07mkii. While on holiday staying in a country cottage near some cow fields, there was a mother cow and what must have been her 2 calves which had been put into separate fields either side of a road. This was obviously pretty distressing for the cows and so they were constantly mooing at each other and being the kind of guy i am, of course i recorded it!. I have done as much as i can to reduce wind and other background noises (the windshield i have for my dr-07 doesn't seem to do a lot except make it look like it's got a 70s afro) and have trimmed all the cow sounds out and put them together into this one file. Some are better than others, it was hard to know which cow was gonna make a noise next. Free to use for anything, if you use it, would be cool if you let us know where in the comments, be interesting to see where they end up :).

I found this old c-60 cassette labelled "xx" in a local thrift store. (i like to collect found sound recordings-- sometimes there's some pretty weird stuff!) well, it turns out i found some guy's old tape recording involving him having sex while blasting some awful anne murray cover album. . . The recording is the post-sex dialogue, right after that final song fades out. . . At the end, the woman asks something like "are you going to get your tape recorder?" and the guy seems to become flustered, saying something like "i wasn't recording, it's off!" (i'm paraphrasing. ) i guess he thought she realised he was recording it or something. Anyways, after this, the recording is cut off. You can also hear a toilet flush, and some sort of "squeaky toy" noise during the recording. Recorded direct to soundcard, playing back the tape on a cheap hand-held cassette player. Edited w/ compression to reduce peaking.

NOTE: Edited version (noise reduced, volume boosted), original is at File:PDP-CH_-_Opéra_Comique_-_Élie_Cohen_-_Joseph_Rogatechwsky_-_Romance_de_Nadir_-_Les_pêcheurs_de_perles_-_Bizet_-_Cormon_-_Carré_-_Columbia-12527-lx90.flac. 1st release date: 1929 1st recording date: 1928 Place of recording: unknown Author(s)/Composer(s): Georges Bizet (1838-1875) Lyricist(s): Eugène Cormon (1810-1903) and Michel Carré (1821-1872) Music arranger(s): none Conductor: Élie Cohen (unknown birth/death date) Performer(s): Joseph Rogatechwsky (1891-1985) de l'Opéra Comique Vocal range: tenor with orchestra accompaniment Title/Work: Les pêcheurs de perles (The Pearl Fishers) (opera) Content: Romance de Nadir Synonym: This is a "Je crois entendre" encore[1] Genre(s): Opera terminology

A recording of a manual typewriter. The author is inserting paper, typing a paragraph, and then removing the paper. Sound of paper being inserted into the typewriter using the paper platen winder. Then the sound of typing of about 50 words. A small bell sound is heard at the end of each line, then the sound of the platen being pushed back to start the next line, and the platen moving the paper up one line. The sample ends with the sound of the paper being wound through the typewriter and removed. I have tried to avoid clipping of each typed letter. There is a lot of percussive multi pitch sound in each typed letter. There is a mechanical escapement that provides a clicking sound as the platen is moved back for the next line. This sample was recorded direct to the hard drive of this samsung nc10 netbook using audacity set to 44. 1khz and 16 bit in mono. A dynamic microphone was used on a small desk stand about 1 foot (30cm) from the typewriter, the stand being on a different table to the one on which the typewriter was used. The microphone was a fairly cheap make (hitachi hmp606) and was pre-amplified using a maycom mictube preamplifier built into the xlr connector, connected to the mic in port of the samsung nc10 netbook. The mic boost was reduced to zero, and the gain of the maycom preamp was at its lowest setting.

Favorite airs from The Mikado (music by Gilbert and Sullivan, 1885) was a 1914 production by Edison Records, performed by the Edison Light Opera Company. This was one of several phonograph cylinders put out by Edison Records (and, no doubt, others) that attempted to encapsulate an entire opera or musical in about four minutes generally, they consisted of a bit of the opening chorus, a verse or two from one or two of the songs, then a bit of the Act II finale. This one is not atypical. The cast is not given, but in the 1913 recording of Pinafore, also by the Edison Light Opera Company, the following singers were featured: Elizabeth Spencer, Mary Jordan, Harry Anthony, Walter Van Brunt, James F. Harrison, and William F. Hooley The only copy of the recording I had to work from was not particularly high quality, and, though I think I managed to clean it up fairly well, I had to leave some of the background noise in, or the singers start to sound unnatural since cleanup of static does, by necessity, remove some information as well. By removing clicks and pops, then blending a noise-reduced track with the one just cleaned of the clicks and pops, good results can be achieved. Notes This was Edison Blue Amberol #2179, which was a reissue of Edison 4-minute Amberol #465. Songs All songs are heavily abridged: Overture (first few seconds) A wand'ring minstrel I Three little maids from school are we Tit-willow (On a tree by a river) Act II Finale: "For he's gone and married Yum-Yum" and "The threatened cloud has passed away" The full text of The Mikado is available on English Wikisource: s:The Mikado.

Favorite airs from The Mikado (music by Gilbert and Sullivan, 1885) was a 1914 production by Edison Records, performed by the Edison Light Opera Company. This was one of several phonograph cylinders put out by Edison Records (and, no doubt, others) that attempted to encapsulate an entire opera or musical in about four minutes generally, they consisted of a bit of the opening chorus, a verse or two from one or two of the songs, then a bit of the Act II finale. This one is not atypical. The cast is not given, but in the 1913 recording of Pinafore, also by the Edison Light Opera Company, the following singers were featured: Elizabeth Spencer, Mary Jordan, Harry Anthony, Walter Van Brunt, James F. Harrison, and William F. Hooley The only copy of the recording I had to work from was not particularly high quality, and, though I think I managed to clean it up fairly well, I had to leave some of the background noise in, or the singers start to sound unnatural since cleanup of static does, by necessity, remove some information as well. By removing clicks and pops, then blending a noise-reduced track with the one just cleaned of the clicks and pops, good results can be achieved. Notes This was Edison Blue Amberol #2179, which was a reissue of Edison 4-minute Amberol #465. Songs All songs are heavily abridged: Overture (first few seconds) A wand'ring minstrel I Three little maids from school are we Tit-willow (On a tree by a river) Act II Finale: "For he's gone and married Yum-Yum" and "The threatened cloud has passed away" The full text of The Mikado is available on English Wikisource: s:The Mikado.

This replica of my tinnitus was created using the free program called audacity. Http://audacityteam. Org/i had to generate 3 different 'tones' and combine them before i felt the high-ish noise was close to what i hear. I then had to search freesound for something that i only hear beneath the high pitch noise when my house is very quiet, which is something like the sound of strong wind outside a closed window or a power station a mile away. It took me a few hours, and even then i had to manipulate the sound considerably. Thanks to felix. Blume forhttp://freesound. Org/people/felix. Blume/sounds/167684/#commentsthis natural wind sound file was equalized and leveled several times, then the sound level was reduced to blend with the high pitch. But it still wasn't right. So, not being an expert with audacity, i just went down the list of 'effects', trying each one, until i found "paulstretch", which somehow increases the time length of your sound file, without stretching as in 'elastic', which would deepen the existing tones, and apparently, without copying and pasting. The sound does change somewhat, becoming just slightly ragged, but it's a very interesting effect for this application and actually got used on both elements to produce the final sound. . I hope no one enjoys this sound and can't imagine that anyone will. It makes me feel slightly sick. . Info edited 28 oct 2021: with my tinnitus at it's current level, i will never, now, be able to reproduce it again, primarily because i can't hear any sounds i create in a detailed way. And secondly, because hearing this version of the sound these days is just too uncomfortable. 🥲.

A few cycles of my dad's home oxygen machine with a ticking battery operated clock in the background recorded in the early morning in the living room with lifecam hd3000 webcam at the end of about 16 feet of usb cable dragged out of my bedroom. He's about 6 feet away, i was with my back to the room with my camera pointed at my chest so he wouldn't think i was filming. It would seem this is the first and only oxygen machine on freesound. A full cycle seems to last from between 7 to 10 seconds. From wikipediaoxygen concentrators typically use pressure swing adsorption technology and are used very widely for oxygen provision in healthcare applications, especially where liquid or pressurised oxygen is too dangerous or inconvenient, such as in homes or in portable clinics. Oxygen concentrators are also used to provide an economical source of oxygen in industrial processes, where they are also known as oxygen gas generators or oxygen generation plants. Oxygen concentrators utilize a molecular sieve to adsorb gasses and operate on the principle of rapid pressure swing adsorption of atmospheric nitrogen onto zeolite minerals and then venting the nitrogen. This type of adsorption system is therefore functionally a nitrogen scrubber leaving the other atmospheric gasses to pass through. This leaves oxygen as the primary gas remaining. Psa technology is a reliable and economical technique for small to mid-scale oxygen generation, with cryogenic separation more suitable at higher volumes and external delivery generally more suitable for small volumes. [1]at high pressure, the porous zeolite adsorbs large quantities of nitrogen, due to its large surface area and chemical character. After the oxygen and other free components are collected the pressure drops which allows nitrogen to desorb. An oxygen concentrator has an air compressor, two cylinders filled with zeolite pellets, a pressure equalizing reservoir, and some valves and tubes. In the first half-cycle the first cylinder receives air from the compressor, which lasts about 3 seconds. During that time the pressure in the first cylinder rises from atmospheric to about 1. 5 times normal atmospheric pressure (typically 20 psi/138 kpa gauge, or 1. 36 atmospheres absolute) and the zeolite becomes saturated with nitrogen. As the first cylinder reaches near pure oxygen (there are small amounts of argon, co2, water vapour, radon and other minor atmospheric components) in the first half-cycle, a valve opens and the oxygen enriched gas flows to the pressure equalizing reservoir, which connects to the patient's oxygen hose. At the end of the first half of the cycle, there is another valve position change so that the air from the compressor is directed to the 2nd cylinder. Pressure in the first cylinder drops as the enriched oxygen moves into the reservoir, allowing the nitrogen to be desorbed back into gas. Part way through the second half of the cycle there is another valve position change to vent the gas in the first cylinder back into the ambient atmosphere, keeping the concentration of oxygen in the pressure equalizing reservoir from falling below about 90%. The pressure in the hose delivering oxygen from the equalizing reservoir is kept steady by a pressure reducing valve. Older units cycled with a period of about 20 seconds, and supplied up to 5 litres per minute of 90+% oxygen. Since about 1999, units capable of supplying up to 10 lpm have been available.

88 piano keys, long natural reverb: up to 13 seconds per note. This is me giving back. I love freesound. You guys saved my bacon back in the day. Recently i searched for free piano notes for a game i'm making, but the only ones i could find ended too quickly. I need long reverb! luckily i have an old piano, so i made my own. So this is me giving back. This is an old piano!!!. We had the piano tuned a year ago, but it is well over 60 years old, so be warned! these notes have character! if you want perfect tone, either edit them individually, generate something artificially, or buy a professional set. But if you want a piano with personality, this is for you. Being an old piano, it only has 85 keys. So i created the highest 3 notes by speeding up previous notes, to make the modern standard 88 keys. How the notes were created. The notes are created on an old (well over 50 years) steinhoff upright piano. It only has 85 keys, so i faked the highest 3 keys by taking previous keys and changing their pitch. I opened the top, balanced my trusty everesta bm-800 condenser microphone across the top near the high note end, and held down the "loud" pedal. Each note was then hit and kept pressed down until i could no longer hear any reverb. Notes were saved as mp3 using my laptop, using free sound recorder on the highest quality settings. Yeah, i know it isn't flac, but i am strictly amateur with budget to match, and that was the best i could do. After that, all editing was of course uncomopressed until the final save. How the notes were edited. Editing was kept to a minimum, mainly to enhance the reverberation. All editing took place on audacity on linux mint. First i cropped any silence from the start. Next, used the envelope function to gradually increae volume to 200% over a couple of seconds. That is, the quietest part of the reverb is twice as loud as you might expect. Because for my game i sometimes need a single piano key to last ten seconds. Next i maximised the volume. If there was just a single stray waveform that stuck out then i reduced that by 2db or so then maximised again. Because like i said, i want to hear that reverb! i then found the part where background noise starts to be noticeable, and faded out over 1 second or so. This meant that the lowest notes had as much as 13 seconds of reverb, whereas the highest notes might only have 2 or so. Finally i checked the result, and edited three or four notes that i felt were just too ugly (badly tuned, or for some reason the software suddenly got hissy when the note became too quiet. Weird. ) i also slightly changed the pitch of a couple of notes that were slightly out of tune but otherwise ok. No doubt a better ear than mine could teak all of the notes. But as i said, it's an old piano and we're keeping it real. Finally, files were compressed to ogg at the highest quality setting, using soundkonverter. Why not flac?. I live in the countryside with very slow broadband, so i apologise for including more of the original files. But as it was, uploading this zip file took about an hour. Enjoy. Legal. Use this for anything you want, commercial or not, credit me or not. Consider it public domain. My main concern is that i had completely legal sound for my game, with nice long reverb and character. Uploading it here provides proof that i created it first, just in case anybody comes back and says "those are mine" (it happens).

Recorded in my dad's bedroom with lifecam hd3000 webcam. This is a much better recording than my previous oxygen concentrator file, as i hauled my desktop into the bedroom at the other end of the apartment where the machine now is, when i was home alone. The webcam is on the bed about 3 or 4 feet from the machineat the beginning of the file you hear me flip the big switch and the machine comes on with a long on beep and thumps. I edited it to start then. At 00:1. 8 what i suspect is the water pump comes on, though i may be wrong. That's when the gurgling starts though. The machine has a small reservoir for distilled water to moisten the airflow. A cup or two lasts several daysyou'll hear various hisses and thumps in a 15. 6 second cycle as it runs. At 03:03 i flip the big switch to shut the machine off, and it bubbles and gurgles away for the rest of the file, as water i assume slowly perculates back into the reservoir, the bubbling getting quieter and quieter until it doesn't even sound like bubbling anymore, until it finally ticks to a stop. At 03:16 you hear me step as i get my foot loose from the mic cord lol. At 04:13 the furnace shuts down as a car finishes going by outside in the bass register, faint traffic noises and the furnace being the only background noises you'll hear aside from my moving around a couple times, and a faint bluejay at the end. At about 07:00 you can barely hear the machine anymore, but i could hear a faint ticking with my own ears. At 07:04 the furnace comes back on. At 07:08 you'll hear a bluejay faintly calling outside and a car going by outside after, which finishes the file at 07:20. I edited out my walking to the computer to shut the recording down. From wikipediaoxygen concentrators typically use pressure swing adsorption technology and are used very widely for oxygen provision in healthcare applications, especially where liquid or pressurised oxygen is too dangerous or inconvenient, such as in homes or in portable clinics. Oxygen concentrators are also used to provide an economical source of oxygen in industrial processes, where they are also known as oxygen gas generators or oxygen generation plants. Oxygen concentrators utilize a molecular sieve to adsorb gasses and operate on the principle of rapid pressure swing adsorption of atmospheric nitrogen onto zeolite minerals and then venting the nitrogen. This type of adsorption system is therefore functionally a nitrogen scrubber leaving the other atmospheric gasses to pass through. This leaves oxygen as the primary gas remaining. Psa technology is a reliable and economical technique for small to mid-scale oxygen generation, with cryogenic separation more suitable at higher volumes and external delivery generally more suitable for small volumes. [1]at high pressure, the porous zeolite adsorbs large quantities of nitrogen, due to its large surface area and chemical character. After the oxygen and other free components are collected the pressure drops which allows nitrogen to desorb. An oxygen concentrator has an air compressor, two cylinders filled with zeolite pellets, a pressure equalizing reservoir, and some valves and tubes. In the first half-cycle the first cylinder receives air from the compressor, which lasts about 3 seconds. During that time the pressure in the first cylinder rises from atmospheric to about 1. 5 times normal atmospheric pressure (typically 20 psi/138 kpa gauge, or 1. 36 atmospheres absolute) and the zeolite becomes saturated with nitrogen. As the first cylinder reaches near pure oxygen (there are small amounts of argon, co2, water vapour, radon and other minor atmospheric components) in the first half-cycle, a valve opens and the oxygen enriched gas flows to the pressure equalizing reservoir, which connects to the patient's oxygen hose. At the end of the first half of the cycle, there is another valve position change so that the air from the compressor is directed to the 2nd cylinder. Pressure in the first cylinder drops as the enriched oxygen moves into the reservoir, allowing the nitrogen to be desorbed back into gas. Part way through the second half of the cycle there is another valve position change to vent the gas in the first cylinder back into the ambient atmosphere, keeping the concentration of oxygen in the pressure equalizing reservoir from falling below about 90%. The pressure in the hose delivering oxygen from the equalizing reservoir is kept steady by a pressure reducing valve. Older units cycled with a period of about 20 seconds, and supplied up to 5 litres per minute of 90+% oxygen. Since about 1999, units capable of supplying up to 10 lpm have been available.