EP0141431A2
Expired / Lapsed
EP
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Digital signal transmitting and/or receiving system
Assignee: Sony Corp
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Filing: 1984-11-09
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Granted: —
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Expires: 2004-11-09
Abstract
Abstract A digital signal transmitting system includes a signa' generator (22 to 24) for producing a time division multiplexed ditigal audio signals and service bit signals, modulator (26) for modulating a carrier in accordance witt the time division-multiplexed signals and a transmitter (20) to transmit the modulated carrier through a CATV (cable television) transmission line. At a receiver side, the service bit signals are decoded so as to control the channel change-over of a television receiver (30) 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 (52).
Inventors
- 👤 Yoshiyuki C/O Sony Corporation Kondoh
- 👤 Takanobu C/O Sony Corporation Ishidoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 05:31
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/65; H04H20/76; H04H20/77; H04H20/78; H04H20/79; H04H20/53; H04H20/59; H04H60/00; H04H60/09; H04H60/14; H04H60/15; H04H60/16; H04H60/23; H04J; H04J3/00; H04J3/16; H04J3/1605; H04N; H04N7/00; H04N7/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
A digital signal transmitting system comprising: (24) a) means/for generating a word synchronizing signal; b) means/for generating digital audio signals sampled at a sampling frequency and coded in a predetermined data length; and (24) c) means/for generating service bit signals to control an operation of a receiver, characterized by (23) d) means/for multiplexing said word synchronizing signal, digital audio signals and servce bit signals so as to produce a digital word signal: and . (26) e) means/for modulating a carrier in accordance with said digital word signal and transmitting the modulated carrier through a transmission line (1).
Claim 2
Dependent Claim
97 words
A digital signal transmitting system comprising: (24) a) means/for generating a word synchronizing signal; b) means/for generating digital audio signals sampled at a sampling frequency and coded in a predetermined data length; and (24) c) means/for generating service bit signals to control an operation of a receiver, characterized by (23) d) means/for multiplexing said word synchronizing signal, digital audio signals and servce bit signals so as to produce a digital word signal: and . (26) e) means/for modulating a carrier in accordance with said digital word signal and transmitting the modulated carrier through a transmission line (1).
Claim 3
Dependent Claim
22 words
A digital signal transmitting system according to claim 1, in which said transmission line (1) comprises a CATV (cable television) transmission line.
Claim 4
Dependent Claim
29 words
A digital signal transmitting system according to claim 2, in which said digital audio signals at least include a 2 channel stereo broadcast signal and an emergency broadcast signal.
Claim 5
Dependent Claim
30 words
A digital signal transmitting system according to claim 3, in which said service bit signals at least include an identifying signal indicative of that said emergency broadcast signal is transmitted.
Claim 6
Dependent Claim
117 words
A digital signal receiving systems, characterized by a) a signal input terminal for receiving a modulated carrier modulated by a time-multiplexed word synchronizing signal, digital audio signals and service bit signals; b) means/for demodulating said time division-multiplesword synchronizing signal, digital audio signals and service bit signals; c) means/for D/A (digital-to-analog)-converting said digital audio signals into analog signals which are supplied to a speaker through an audio amplifier; (30) d) a television receiver/connected to said signal input terminal so as to receive a plurality of channels; (62, 63) e) means/for latching said service bit signals; and (67) f) control means/connected to said latching means so as to produce a control signal which is supplied to said television receiver.
Claim 7
Dependent Claim
117 words
A digital signal receiving systems, characterized by a) a signal input terminal for receiving a modulated carrier modulated by a time-multiplexed word synchronizing signal, digital audio signals and service bit signals; b) means/for demodulating said time division-multiplesword synchronizing signal, digital audio signals and service bit signals; c) means/for D/A (digital-to-analog)-converting said digital audio signals into analog signals which are supplied to a speaker through an audio amplifier; (30) d) a television receiver/connected to said signal input terminal so as to receive a plurality of channels; (62, 63) e) means/for latching said service bit signals; and (67) f) control means/connected to said latching means so as to produce a control signal which is supplied to said television receiver.
Claim 8
Dependent Claim
32 words
A digital signal receiving system according to claim 5, in which the channel of said television receiver(30) is changed-over by said control signal from said control means to receive a predetermined channel.
Claim 9
Dependent Claim
19 words
A digital signal receiving system according to claim 6, in which said predetermined channel receives an emergency broadcast signal.
Claim 10
Dependent Claim
18 words
A digital signal receiving system according to claim 7, in which said control means (67) comprises a micro-computer.
Claim 11
Dependent Claim
32 words
A digital signal receiving system according to claim 7, in which said control means/produces a muting control signal which is used to prevent an analog signal from being transmitted to said speaker.
References Cited (Backward Citations)
No citation records indexed.
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