H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/34
H04N 9/12 (2006.01) H04N 7/084 (2006.01)
Patent
CA 1162294
Case No. 4300.232 ABSTRACT Auxiliary signals suitable for conveying additional audio signals for stereophonic television broadcasts, bilingual sound, and the like, are transmitted in the form of modulated bursts of such auxiliary signal placed on the front porch of the composite video signal and continued through the vertical synchronization pulse intervals. At the receiver, a transmission gate is connected to receive the composite video signal and has an output coupled to an auxiliary signal demodulation circuit. The transmission gate is operated to pass only the auxiliary signal bursts in response to control signals obtained from the sweep circuit of the television receiver. By utilizing composite AM/FM modulation of the auxiliary signal or by employing quadrature modulation, dual or stereophonic sound signals may he obtain a for reproduction with corresponding output utilization circuitry.
374957
Gowling Lafleur Henderson Llp
Matsushita Electric Corporation Of America
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