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ADAFRUIT-AUDIO-FX-taille-audio (voir la source)
Version du 2 janvier 2016 à 13:47
, 2 janvier 2016 à 13:47Page créée avec « {{ADAFRUIT-AUDIO-FX-NAV}} == Taille des fichiers audio == {{bloc-etroit|text=We have SFX boards in both 2MB and 16MB versions. You may be thinking "Wow, that is nothing,... »
{{ADAFRUIT-AUDIO-FX-NAV}}
== Taille des fichiers audio ==
{{bloc-etroit|text=We have SFX boards in both 2MB and 16MB versions. You may be thinking "Wow, that is nothing, I send emails bigger than that on a daily basis!" But you'd be surprised! For sound effects and small embedded audio devices, you need a surprisingly small amount of space.
Depending on whether or not you compress the audio, have stereo or mono, CD quality or 'every day' quality, you can store anywhere up to approx an hour of compressed music (mono 22KHz Ogg Vorbis on the 16MB version)}}
== Compressé ou pas? ==
{{bloc-etroit|text=First up, remember you can always have compressed audio which saves you a ton of space. The Sound Board can handle Ogg Vorbis (a sort of royalty-free MP3 format) in any bit rate}}
== Stéréo ou Mono ==
{{bloc-etroit|text=Most projects do not need true stereo, if you are only using one speaker or if you don't need two distinct channels, record/convert your audio as Mono! You'll get the same audio from both left and right channels and fit 2x as much music.}}
== Bit Rates / Sample Rates ==
'''Bit Rates:''' Le débit binaire est une mesure de la quantité de données numériques transmises par unité de temps. Il est le plus souvent exprimé en bits par seconde ou un de ses multiples en employant les préfixes du système international : kb/s, Mb/s, Gb/s et ainsi de suite. ... (source: [https://fr.wikipedia.org/wiki/D%C3%A9bit_binaire Wikipedia])
'''Sample Rates:''' C'est le nombre d'échantillon (capture du niveau audio) réalisé sur le signal audio chaque seconde. Elle se mesure en hertz voire même en KHertz. Par exemple, un échantillonnage 44 KHertz signifie que relève le niveau audio et le converti en valeur numérique 44000 fois chaque seconde. Cela signifie que l'on produit 44000 valeurs numérique chaque seconde.
CD quality audio is 44.1KHz 16Bit, thats 44100 2-byte samples per second. While you can decode audio on the Sound Boards at that rate, often times your speakers or headphones aren't that good anyways.
We suggest sticking with 16 bits, but reducing the sample rate to 22KHz unless you are piping the audio into a quality stereo system or expect users to have fancy headphones plugged in. If you're doing 'voice' type effects, you may be able to go down to 11KHz. Every time you reduce the sample rate, you can double or triple the length of audio.
{{ADAFRUIT-AUDIO-FX-TRAILER}}
== Taille des fichiers audio ==
{{bloc-etroit|text=We have SFX boards in both 2MB and 16MB versions. You may be thinking "Wow, that is nothing, I send emails bigger than that on a daily basis!" But you'd be surprised! For sound effects and small embedded audio devices, you need a surprisingly small amount of space.
Depending on whether or not you compress the audio, have stereo or mono, CD quality or 'every day' quality, you can store anywhere up to approx an hour of compressed music (mono 22KHz Ogg Vorbis on the 16MB version)}}
== Compressé ou pas? ==
{{bloc-etroit|text=First up, remember you can always have compressed audio which saves you a ton of space. The Sound Board can handle Ogg Vorbis (a sort of royalty-free MP3 format) in any bit rate}}
== Stéréo ou Mono ==
{{bloc-etroit|text=Most projects do not need true stereo, if you are only using one speaker or if you don't need two distinct channels, record/convert your audio as Mono! You'll get the same audio from both left and right channels and fit 2x as much music.}}
== Bit Rates / Sample Rates ==
'''Bit Rates:''' Le débit binaire est une mesure de la quantité de données numériques transmises par unité de temps. Il est le plus souvent exprimé en bits par seconde ou un de ses multiples en employant les préfixes du système international : kb/s, Mb/s, Gb/s et ainsi de suite. ... (source: [https://fr.wikipedia.org/wiki/D%C3%A9bit_binaire Wikipedia])
'''Sample Rates:''' C'est le nombre d'échantillon (capture du niveau audio) réalisé sur le signal audio chaque seconde. Elle se mesure en hertz voire même en KHertz. Par exemple, un échantillonnage 44 KHertz signifie que relève le niveau audio et le converti en valeur numérique 44000 fois chaque seconde. Cela signifie que l'on produit 44000 valeurs numérique chaque seconde.
CD quality audio is 44.1KHz 16Bit, thats 44100 2-byte samples per second. While you can decode audio on the Sound Boards at that rate, often times your speakers or headphones aren't that good anyways.
We suggest sticking with 16 bits, but reducing the sample rate to 22KHz unless you are piping the audio into a quality stereo system or expect users to have fancy headphones plugged in. If you're doing 'voice' type effects, you may be able to go down to 11KHz. Every time you reduce the sample rate, you can double or triple the length of audio.
{{ADAFRUIT-AUDIO-FX-TRAILER}}