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boeysue
Joined: 23 Dec 2004
Posts: 190
Helped: 3
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 04 Jan 2005 0:08 What is the develoment of the audio codec? |
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What is the new development of the audio codec?
I mean such as sigma delta ADC/DAC ,..Mp3,AAC ....,etc...
Thanks for answering
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kalyanram
Joined: 03 Jan 2005
Posts: 558
Helped: 346
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04 Jan 2005 9:50 Re: What is the develoment of the audio codec? |
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Hi,
If your question is with respect to the complexity and the compression then here are the standards that are latest.
Audio:
AC3, Variation of CSACELP(ITU-TG.729) for whole of audio.
Speech:
CSACELP(ITU-TG.729) the best wrt both quality & compression, MELP avg quality but greater compression.
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boeysue
Joined: 23 Dec 2004
Posts: 190
Helped: 3
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04 Jan 2005 12:30 Re: What is the develoment of the audio codec? |
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In speech,there is one king of compression named "waveform interpolation".
Will it be popular in the future?
thanks .
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Google
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04 Jan 2005 12:30 Ads |
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spweda
Joined: 28 Jun 2001
Posts: 195
Helped: 4
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05 Jan 2005 0:09 Re: What is the develoment of the audio codec? |
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SMV coder for 3GPP2. Select mode vocoder. Developed by Conexcent and other companies.
Mpeg4 audio, which includes a 2 kbps low bit rate speech coding developed by Sony. It uses hormonic coders for voiced speech and CELP for unvoiced speech.
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dinolin
Joined: 19 Jul 2002
Posts: 39
Helped: 1
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11 Jan 2005 9:57 Re: What is the develoment of the audio codec? |
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| sigma delta ADC/DAC are old tech .... more than 20 years
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boeysue
Joined: 23 Dec 2004
Posts: 190
Helped: 3
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11 Jan 2005 16:01 Re: What is the develoment of the audio codec? |
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Hi,dinolin:
Do you have some sigma delta document ??such as
1.Oversampling Delta-Sigma Data Converters : Theory, Design, and Simulation
by James C. Candy (Editor), Gabor C. Temes (Editor)
2.Understanding Delta-Sigma Data Converters
by Richard Schreier, Gabor C. Temes
3.Delta-Sigma Modulators: Modeling, Design and Applications
by George I. Bourdopoulos, Aristodemos Pnevmatikakis, Vassilis Anastassopoulos, Theodore L. Deliyannis
thanks for that.
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dinolin
Joined: 19 Jul 2002
Posts: 39
Helped: 1
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12 Jan 2005 2:57 Re: What is the develoment of the audio codec? |
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Only 1, but no ebook!
you can search the internet for delta sigma or sigma delta tutorial!
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boeysue
Joined: 23 Dec 2004
Posts: 190
Helped: 3
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12 Jan 2005 3:30 Re: What is the develoment of the audio codec? |
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Do you mean the motora's application note?
I have already had it.
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