Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1985-04-08
1991-11-26
Shaw, Dale M.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
3701101, G10L 302, H04J 312, H04B 166
Patent
active
050688995
ABSTRACT:
Speech signal components in a high band of frequencies between 4 and 8 kHz are transmitted via a digital transmission channel, which carries speech signal samples at frequencies below 4 kHz and sampled at a rate of 8 kHz, 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.
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Ellis John G.
Townsend Bruce L.
Haley R. John
Knepper David D.
Northern Telecom Limited
Shaw Dale M.
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