Adaptive expanders for fm stereophonic broadcasting system...

Details Adaptive expanders for fm stereophonic broadcasting system... Adaptive expanders for fm stereophonic broadcasting system...

H - Electricity

04

B

325/73

H04B 1/16 (2006.01) H04H 5/00 (2006.01)

Patent

CA 1243359

ABSTRACT A stereophonic broadcasting system incorporating companding of the difference signal in which both the usu- al difference signal and a compressed version of the dif- ference signal are transmitted to one or more remote re- ceivers. At the receiver the usual, unchanged, difference signal is used as a reference signal for controlling the expansion of the compressed difference signal so as to cause the amplitude of the companded difference to equal the level of the usual difference signal. Thus, the ex- pander is adaptive to any compression characteristic that might be employed at the transmitter. Further, the avail- ability of the usual uncompressed difference signal at the receiver enables the adaptive decoding of dynamic parame- ters of the received signal, such as frequency response and attack and recovery times, so that all of the parame- ters of the original signal can be restored automatical- ly.

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