Web audio codec guide - Web media technologies
codec name (short) full codec name container support aac advanced audio coding mp4, adts, 3gp alac apple lossless audio codec mp4, quicktime (mov) amr adaptive multi-rate 3gp flac free lossless audio codec mp4, ogg, flac g.711 pulse code modulation (pcm) of voice frequencies rtp / webrtc g.722 7 khz audio coding within 64 kbps (for telephony/voip) rtp / webrtc mp3 mpeg-1 audio layer iii mp4, adts, mpeg1, 3gp opus opus webm, mp4, ogg vorbis vorbis webm, ogg [1] when mpeg-1 audio layer iii codec data is stored in an mpeg file, and there is no video track on the file, the file is typically referred to as an mp3 file, even though it's still ...
...human speech generally resides within the audio frequency range of 300 hz to 18 khz.
... however, the vast majority of human vocalizations exist in the range 300 hz to 8 khz, and you can capture enough of human vocalizations in the frequency range 500 hz to 3 khz to still be understandable.
...And 11 more matches

Digital audio concepts - Web media technologies
at the common sample rate of 48 khz (48,000 samples per second), this means each second of audio occupies 192 kb of memory.
... the most common sample rates are: 8000 hz the international g.711 standard for audio used in telephony uses a sample rate of 8000 hz (8 khz).
... 44100 hz the 44.1 khz sample rate is used for compact disc (cd) audio.
...And 9 more matches

<frequency> - CSS: Cascading Style Sheets
khz represents a frequency in kilohertz.
... examples: 0khz, 1.5khz, 10khz.
...in other words, 0 is invalid and does not represent 0hz or 0khz.
...And 3 more matches

Basic concepts behind Web Audio API - Web APIs
here's a couple of simple examples: var context = new audiocontext(); var buffer = context.createbuffer(2, 22050, 44100); note: in digital audio, 44,100 hz (alternately represented as 44.1 khz) is a common sampling frequency.
... why 44.1khz?
...therefore, the sampling rate has to be greater than 40 khz.
...And 2 more matches

attr() - CSS: Cascading Style Sheets
30.5khz).
... hz, khz <frequency> the attribute value is parsed as a css <number>, that is without the unit (e.g.
...)where <type-or-unit> = string | color | url | integer | number | length | angle | time | frequency | cap | ch | em | ex | ic | lh | rlh | rem | vb | vi | vw | vh | vmin | vmax | mm | q | cm | in | pt | pc | px | deg | grad | rad | turn | ms | s | hz | khz | % examples content property html <p data-foo="hello">world</p> css [data-foo]::before { content: attr(data-foo) " "; } result <color> value html <div class="background" data-background="lime">background expected to be red if your browser does not support advanced usage of attr()</div> css .background { height: 100vh; } .background { background-color: red; } .backgrou...

<frequency-percentage> - CSS: Cascading Style Sheets
examples valid percentage values 90% positive percentage +90% positive percentage with leading + -90% negative percentage — not valid for all properties that use percentages invalid percentage values 90 % no space is allowed between the number and the unit valid frequency values 12hz positive integer 4.3hz non-integer 14khz the unit is case-insensitive, though non-si capitalization is not recommended.
... +0hz zero, with a leading + and a unit -0khz zero, with a leading - and a unit invalid frequency values 12.0 this is a <number>, not an <frequency>, because it is missing a unit.

Web video codec guide - Web media technologies
encoding your audio using opus's fullband profile at a 48 khz sample rate maximizes the audio bandwidth captured, capturing nearly the entire frequency range that's within human hearing.
...for audio, use the aac codec at a high sample rate (at least 48 khz but ideally 96khz) and encoded with complex encoding rather than fast encoding.

Codecs used by WebRTC - Web media technologies
audio in general, if it's available and the audio you wish to send has a sample rate greater than 8 khz, you should strongly consider using opus as your primary codec.
... for voice-only connections in a constrained environment, using g.711 at an 8 khz sample rate can provide an acceptable experience for conversation, but typically you'll use g.711 as a fallback option, since there are other options which are more efficient and sound better, such as opus in its narrowband mode.

Introducing the Audio API extension - Archive of obsolete content
for example: // create a new audio element var audiooutput = new audio(); // set up audio element with 2 channel, 44.1khz audio stream.

nsIDOMHTMLAudioElement
for example, specify 44100 for 44.1khz.

AudioBufferSourceNode.playbackRate - Web APIs
consider a sound buffer containing audio sampled at 44.1 khz (44,100 samples per second).

AudioContext() - Web APIs
example this example creates a new audiocontext for interactive audio (optimizing for latency) and a sample rate of 44.1khz.

CSS numeric factory functions - Web APIs
lh(number); css.rlh(number); css.vw(number); css.vh(number); css.vi(number); css.vb(number); css.vmin(number); css.vmax(number); css.cm(number); css.mm(number); css.q(number); css.in(number); css.pt(number); css.pc(number); css.px(number); // <angle> css.deg(number); css.grad(number); css.rad(number); css.turn(number); // <time> css.s(number); css.ms(number); // <frequency> css.hz(number); css.khz(number); // <resolution> css.dpi(number); css.dpcm(number); css.dppx(number); // <flex> css.fr(number); examples we use the css.vmax() numeric factory function to create a cssunitvalue: let height = css.vmax(50); console.log( height ); // cssunitvalue {value: 50, unit: "vmax"} console.log( height.value ) // 50 console.log( height.unit ) // vmax in this example, we set the margin o...

CSSPrimitiveValue.getFloatValue() - Web APIs
css_khz the value is a <frequency> in kilohertz.

CSSPrimitiveValue.primitiveType - Web APIs
css_khz the value is a <frequency> in kilohertz.