Digital signal transmitting and/or receiving system
AssigneeSony Corporation
InventorsYoshiyuki Kondoh, Takanobu Ishidoh
Life of this patent
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Abstract
A digital signal transmitting system includes a signal generator for producing time division-multiplexed digital audio signals and service bit signals, a modulator for modulating a carrier in accordance with the time division-multiplexed signals and a transmitter to transmit the modulated carrier through a CATV (cable television) transmission line. In a receiver, the service bit signals are decoded so as to control the channel changeover of a television receiver when an emergency broadcast signal is transmitted. A muting control circuit is also provided so as to mute an audio signal from a D/A (digital-to-analog) converter.
Claims7
A digital signal transmitting system comprising:
- means for generating a word synchronizing signal;
- means for generating digital audio signals sampled at a sampling frequency and coded in a predetermined data length;
- means for generating service bit signals including an identifying signal indicating that an emergency broadcast signal is being transmitted;
- means for mutiplexing said word synchronizing signal, digital audio signals and service bit signals so as to produce a digital word signal;
- a cable television transmission line;
- and
- means for modulating a carrier in accordance with said digital word signal and transmitting the modulated carrier through said cable television transmission line.
A digital signal receiver comprising:
- a signal input terminal for receiving a modulated carrier modulated by a time-multiplexed word synchronizing signal, digital audio signals and service bit signals, said service bit signals including an identifying signal indicating than an emergency broadcast signal is being transmitted;
- means for demodulating said time division-multiplexed word synchronizing signal, digital audio signals and service bit signals;
- a speaker,
- an audio amplifier connected to said speaker;
- means for digital-to-analog-converting said digital audio signals into analog signals which are supplied to said speaker through said audio amplifier;
- a television receiver connected to said signal input terminal so as to receive a plurality of channels;
- means for latching said service bit signals;
- and
- control means connected to said latching means so as to produce a control signal which is supplied to said television receiver to turn on said television receiver when said identifying signal is received.
Dependencies are inferred from the claim text.