Television receiver for demodulating a two-language stereo broadcast signal
First Claim
1. Apparatus for demodulating a multiplexed sound signal comprised of a first sound signal formed by the sum of a first channel signal and a second channel signal, a second sound signal formed by the difference of said first channel signal and said second channel signal, and a third sound signal, comprising:
- demodulation means for producing one of said second sound signal and third sound signal in response to said multiplexed sound signal;
selector means for selectively controlling said demodulation means to produce one of said second sound signal and third sound signal in response to said multiplexed sound signal;
matrix means for producing a stereo sound signal in response to said first and second sound signals;
output means; and
switch means for supplying said third sound signal to said output means when said selector means controls said demodulation means to produce said third sound signal and for supplying said stereo sound signal to said output means when said selector means controls said demodulation means to produce said second sound signal.
1 Assignment
0 Petitions
Accused Products
Abstract
Apparatus for demodulating a multiplexed sound signal comprised of a first sound signal formed by the sum of a left channel signal and a right channel signal in a first language, a second sound signal formed by the difference of the left channel signal and the right channel signal, and a third sound signal in a second language, comprising a single demodulation circuit for producing either the second sound signal or third sound signal in response to the multiplexed sound signal; a selector switch for selectively changing the center frequency of the demodulation circuit to control the latter to produce either the second sound signal or third sound signal in response to the multiplexed sound signal; a matrix circuit for producing a stereo sound signal in response to the first and second sound signals; a pair of output terminals; and a switch device for supplying the third sound signal as a second language monaural sound signal from the demodulation circuit to one output terminal when the selector switch controls the demodulation circuit to produce the third sound signal and for supplying the stereo sound signal to both output terminals from the matrix circuit as a first-language stereo signal when the selector switch controls the demodulation circuit to produce the second sound signal.
40 Citations
7 Claims
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1. Apparatus for demodulating a multiplexed sound signal comprised of a first sound signal formed by the sum of a first channel signal and a second channel signal, a second sound signal formed by the difference of said first channel signal and said second channel signal, and a third sound signal, comprising:
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demodulation means for producing one of said second sound signal and third sound signal in response to said multiplexed sound signal; selector means for selectively controlling said demodulation means to produce one of said second sound signal and third sound signal in response to said multiplexed sound signal; matrix means for producing a stereo sound signal in response to said first and second sound signals; output means; and switch means for supplying said third sound signal to said output means when said selector means controls said demodulation means to produce said third sound signal and for supplying said stereo sound signal to said output means when said selector means controls said demodulation means to produce said second sound signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification