SNR of MP3, Split from Topic ID #96702 |
SNR of MP3, Split from Topic ID #96702 |
 Aug 28 2012, 18:37
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 Winamp Developer Group: Developer Posts: 662 Joined: 17-July 05 From: Ashburn, VA Member No.: 23375  |
QUOTE (jensend @ Aug 27 2012, 11:45)  The LP noise floor is rather high- maybe -70dB under very good conditions. 12-bit sampling (RMS noise floor of -72dB) would be sufficient for LP use as long as your levels are right (peak signal above -6dB). (12-bit sampling was used for DV but hasn't seen any other widespread use). The SNR of an MP3 is around 25-30dB. Does this mean that I only need to decode them to 6-bit PCM to capture all the details? I am curious if anyone has ever done a detailed analysis of an LP's SNR in different frequency bands. This post has been edited by benski: Aug 28 2012, 19:07 |
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Aug 28 2012, 20:20
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Group: Members Posts: 3080 Joined: 1-September 05 From: SE Pennsylvania Member No.: 24233 |
QUOTE (benski @ Aug 28 2012, 13:37) The SNR of an MP3 is around 25-30dB. I don't know why you say that. The dynamic range of mp3 is obviously much greater than 30 dB. I would be more inclined to describe mp3's deviation from the original as distortion rather than noise, because it is quite capable of rendering very quiet passages with very little added noise. |
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Aug 30 2012, 15:14
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Group: Members Posts: 147 Joined: 31-July 08 Member No.: 56508 |
A simpler test is a subtraction test: subtract the mp3 waveform from the original waveform and measure the difference. Your test is probably valid too, but the notch should be narrow and you should rate the noise to the original signal level.
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Lo-Fi Version | Time is now: 21st May 2013 - 14:22 |
