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Topic: Using speech codecs to store Hi-Fi, stereo music like on CDs (Read 347 times) previous topic - next topic
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Using speech codecs to store Hi-Fi, stereo music like on CDs

What I remember last days is:
Quote
If you make the Frankenstein of dividing a piece of music in 6 bands (each band has 4 kHz of bandwidth), divide in left and right channels, and encode each using TWELP at 3.6 kbps, you can store music with TWELP at 43.2 kbps, either 44.1 or 48 kHz and stereo!
So, that's what I said. Using speech codecs to store high-fidelity, stereo sound! Challenge is to write a tool to do that.
Maybe not the best idea but will be better than MP3 at the same bitrate.
Here is a table showing this in a more simple form:

CodecBitrate for each band and channelTotal bitrate for full-band, stereo music (44.1 or 48 kHz)Approximate equivalent to more common codecs
TWELP3.6 kbps43.2 kbpsOpus or HE-AACv2 at 40/44 kbps
Codec23.2 kbps38.4 kbpsMP3 at 40 kbps or Opus/HE-AACv2 at 36/40 kbps
Voxware MetaVoice3 kbps36 kbpsOpus or HE-AACv2 at 36 kbps
MetaVoice, TWELP, MELPe or Codec22.4 kbps28.8 kbpsOpus or HE-AACv2 at 28 kbps
TWELP or Codec21.6 kbps19.2 kbpsOpus, xHE-AAC or HE-AACv2 at 20 kbps
Codec21.4 kbps16.8 kbpsOpus, xHE-AAC or HE-AACv2 at 16 kbps
Codec21.3 kbps15.6 kbpsOpus, xHE-AAC or HE-AACv2 at 16 kbps
Codec2, MELPe or TWELP1.2 kbps14.4 kbpsOpus, xHE-AAC or HE-AACv2 at 12/14 kbps
Codec2 or TWELP700 bps (0.7 kbps)8.4 kbpsOpus or xHE-AAC in mono at 8 kbps
TWELP or MELPe600 bps (0.6 kbps)7.2 kbpsOpus or xHE-AAC in mono at 6/8 kbps
TWELP480 bps (0.48 kbps)5.76 kbpsOpus or xHE-AAC in mono at 6 kbps
TWELP400 bps (0.4 kbps)4.8 kbpsClose to xHE-AAC in mono at 6 kbps. Opus at 5 kbps
TWELP300 bps (0.3 kbps)3.6 kbpsOpus at 3/4 kbps