Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1988-06-27
1990-03-06
Kemeny, Emanuel S.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
371 31, 375122, G10L 500
Patent
active
049072773
ABSTRACT:
A method of reconstructing, at the receiving end, digital data defining an encoded voice signal segment lost in transmission between the transmitter and the receiver in a transmission system wherein a low-frequency signal such as a residual baseband signal is derived at the transmitting end from the signal to be encoded and is then distributed among several sub-bands whose sampled contents are quantized separately. The reconstruction method includes a step of analyzing the received signal to detect any missing segment thereof and, as the case may be, to initiate an analysis, within each sub-band, of the segment(s) adjacent to the lost segment, so as to generate a term relating to the period T.sub.(k) of the signal so analyzed and to reconstruct a segment of signal of period T.sub.(k) intended to be substituted for the lost segment. Cyclic redundancy is used to detect errors, and modulo sequence numbering identification is used to detect loss of packet.
REFERENCES:
patent: 4216354 (1980-08-01), Esteban
patent: 4287592 (1981-09-01), Paulish
patent: 4291405 (1981-09-01), Jayant
patent: 4464783 (1984-08-01), Beraud et al.
patent: 4672670 (1987-06-01), Wang
Callens Paul
Galand Claude
Platel Guy
Vermot-Gauchy Robert
Frisone John B.
International Business Machines Corp.
Kemeny Emanuel S.
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