Television sound receiver

Details Television sound receiver Television sound receiver

H - Electricity

04

N

350/97

H04N 5/62 (2006.01) H04N 5/60 (2006.01)

Patent

CA 1170355

ABSTRACT OF THE DISCLOSURE A television sound receiver having an input terminal for receiving a television sound signal, a tuner, including a local oscillator connected to the input terminal, an intercarrier sound demodulating circuit connected to the tuner, a split-carrier sound demodulating circuit, in- cluding a limiter amplifier, connected to the tuner, a sound signal output terminal, and a switching device for selectively and operatively connecting either the inter- carrier or split-carrier sound demodulating circuits between the tuner and the sound signal output terminal. Additionally, the receiver includes an error detecting device connected to the split-carrier sound demodulating circuit for detecting the frequency error of the local oscillator and a first operational device which is responsive to an output signal from the error detecting device and which produces a first operational device output signal which activates the switching device such that the split-carrier sound demodulating circuit is operatively connected between the tuner and the sound output terminal when the output signal from the error detecting device is less than a predetermined level. Level detectors are connected to the limiter amplifier and detect a level of split-carrier sound signal. A second operational device, which is responsive to the output signal from the level detectors, produces an output signal which activates the switching device such that the intercarrier sound de- modulating circuit is operatively connected between the tuner and the sound output terminal when the output signals from the level detectors are less than a pre- determined value.

394390

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