H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/94, 350/97
H04N 7/04 (2006.01)
Patent
CA 1145032
ABSTRACT OF THE DISCLOSURE A receiver for a compatable stereophonic television sound transmission system having left and right audio signals in conjunction with a television broadcast wherein video information is conveyed on an amplitude-modulated carrier in a frequency channel having defined frequency limits. The system includes at a transmitter location a multiplex generator for generating a composite signal having a first component representative of the sum of the audio signals, a second component comprising an amplitude-modulated suppressed carrier subcarrier signal representative of the difference between the audio signals, and a pilot component representative of the phase and frequency of the suppressed carrier. The composite signal is utilized to frequency- modulate a sound carrier to develop an RF signal component which is added to the television channel at a discrete frequency spacing from the video carrier. The receiver includes a tuner for converting the transmission channel to an intermediate frequency, a filter for separating the sound signal therefrom, and a detector for deriving the composite signal from the sound signal. The composite signal is demodulated in a stereo demodulating stage to develop the left and right audio signals.
390732
Osler Hoskin & Harcourt Llp
Telesonics Systems Inc.
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