Transmission of wideband speech signals

Details Transmission of wideband speech signals Transmission of wideband speech signals

H - Electricity

04

L

354/47, 379/9

H04L 25/02 (2006.01) G10L 19/06 (2006.01) H03M 1/12 (2006.01) H04B 1/66 (2006.01) H04J 3/16 (2006.01)

Patent

CA 1220282

TRANSMISSION OF WIDEBAND SPEECH SIGNALS Abstract of the Disclosure Speech signal components in a high band of frequencies between 4 and 8kHz are transmitted via a digital transmission channel, which carries speech signal samples at frequencies below 4kHz and sampled at a rate of 8kHz, by replacing the least significant bit of the samples with bits of information derived from the high band by linear predictive coding. These information bits are transmitted in frames, each frame comprising a synchronizing bit and bits representing the power of and a set of filter coefficients for the high band signal components occurring in a period corresponding to the frame duration. Each such bit is transmitted redundantly three or six times in view of bit stealing techniques already used for signalling on digital transmission links. The resulting wideband speech signal transmission is compatible with existing limited bandwidth voice channel transmission arrangements. - i -

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