LPC-to-MELP transcoder
OwnerRichard L. Zinser, JR., Steven R. Koch +1inventors
InventorsRichard L. Zinser, JR., Steven R. Koch, Mark L. Grabb
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Abstract
The system and method of the present invention comprises a compressed domain universal transcoder that transcodes a bit stream representing frames of data encoded according to an LPC coding standard to a bit stream representing frames of data according to a MELP coding standard. The method includes decoding a bit stream into a first set of parameters compatible with the LPC coding standard. Next, the LPC set of parameters are transformed into a MELP set of parameters compatible with the MELP coding standard without converting the LPC set of parameters to an analog or digital waveform representation. Lastly, the MELP set of parameters are encoded into a bit stream compatible with the MELP coding standard.
Claims24
A method for transcoding a bit stream encoded according to a linear predictive coding (LPC) standard to a bit stream encoded according to a mixed-excitation linear prediction (MELP) standard, comprising:
- decoding a bit stream into a first set of vocoder parameters compatible with the LPC standard;
- transforming the first set of vocoder parameters into a second set of vocoder parameters compatible with the MELP standard without converting the first set of vocoder parameters to an analog or digital waveform representation;
- and
- encoding the second set of vocoder parameters into a bit stream compatible with the MELP vocoder standard.
A method of converting LPC parameters to MELP parameters, comprising:
- receiving LPC parameters;
- and
- transforming the LPC parameters to MELP parameters without converting to a decompressed form.
A transcoder for transcoding a bit stream encoded according to a linear predictive coding (LPC) standard to a bit stream encoded according to a mixed-excitation linear prediction (MELP) standard, comprising:
- a decoder decoding a bit stream into a first set of vocoder parameters compatible with the LPC standard;
- a conversion unit transforming the first set of vocoder parameters into a second set of vocoder parameters compatible with the MELP standard without converting the first set of vocoder parameters to an analog or digital waveform representation;
- and
- an encoder encoding the second set of vocoder parameters into a bit stream compatible with the MELP vocoder standard.
Dependencies are inferred from the claim text.