EP0144801A2
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EP
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Digital signal transmitting 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 produces digital signals of up to four different modes for transmission over an unused television channel in an existing cable television transmission line and which requires no more bandwidth than that normally required by a single existing television channel, the various modes of digital signals all include synchronizing signals and service bit signals which are used to address any of the numerous terminals at the receiving side to control access to the various modes of digital signals transmitted over the single channel. By controlling the transmission of the modes to have constant time intervals, which can be selected based upon different sampling times, high quality audio signals may be transmitted or/and data channels or monaural audio signals, all of which may be transmitted over the single cable television transmission line.
Inventors
- 👤 Masakatsu C/O Sony Corporation Toyoshima
- 👤 Yasuhiro C/O Sony Corporation Hideshima
- 👤 Etsumi C/O Sony Corporation Fujita
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 17:28
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88; H04H20/28; H04H20/65; H04H20/76; H04H20/77; H04H20/78; H04H20/79
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
183 words
A digital signal transmitting and receiving system comprising: (207-210, 213) means /for generating a first mode of digital word signals, each.digital word signal consisting of a word synchronizing signal, a service bit signal, and data signals having a first plurality of data channels of data sampled at a first sampling frequency; (215) means for generating a second mode of digital word signals, each digital word signal consisting of a word synchronizing signal, a service bit signal, and data signals having a second plurality of data channels of data sampled at a second sampling frequency: (219-221) means for selectively transmitting said first mode of digital word signals and said second mode of digital words through a cable television transmission line (222); and a plurality of receivers connected to said cable television transmission line, each receiving said selectively transmitted first and second modes of digital word signals; characterized by means for addressing said plurality of receivers in response to a control signal produced by decoding said frame synchronizing signal and said service bit signals contained in said first and second modes of digital word signals.
Claim 2
Dependent Claim
183 words
A digital signal transmitting and receiving system comprising: (207-210, 213) means /for generating a first mode of digital word signals, each.digital word signal consisting of a word synchronizing signal, a service bit signal, and data signals having a first plurality of data channels of data sampled at a first sampling frequency; (215) means for generating a second mode of digital word signals, each digital word signal consisting of a word synchronizing signal, a service bit signal, and data signals having a second plurality of data channels of data sampled at a second sampling frequency: (219-221) means for selectively transmitting said first mode of digital word signals and said second mode of digital words through a cable television transmission line (222); and a plurality of receivers connected to said cable television transmission line, each receiving said selectively transmitted first and second modes of digital word signals; characterized by means for addressing said plurality of receivers in response to a control signal produced by decoding said frame synchronizing signal and said service bit signals contained in said first and second modes of digital word signals.
Claim 3
Dependent Claim
46 words
A digital signal transmitting and receiving system according to claim 1, in which said means for addressing includes means for producing said control signal from a plurality of said word synchronizing signals in successive ones of said first and second modes of said digital words signals.
Claim 4
Dependent Claim
25 words
A digital signal transmitting and receiving system according to claim 1, in which said first and second sampling frequencies are both at a same frequency.
Claim 5
Dependent Claim
18 words
A digital signal transmitting and receiving system according to claim 3, in which said same frequency is 44.1KHz.
Claim 6
Dependent Claim
25 words
A digital signal transmitting and receiving system according to claim 1, in which said second sampling frequency is one half of said first sampling frequency.
Claim 7
Dependent Claim
46 words
A digital signal transmitting and receiving system according to claim 1, in which said first mode of digital word signals includes left channel and right channel stereo signals, said first sampling frequency is 44.1KHz, and said first plurality of data channels is arranged in 16-bit words.
Claim 8
Dependent Claim
42 words
A digital signal transmitting and receiving system according to claim 1, in which said second mode of digital word signals includes a monaural signal, said second sampling frequency is 22.05KHz, and said first plurality of data channels is arranged in 8-bit words.
Claim 9
Dependent Claim
107 words
A digital signal transmitting system comprising: means for generating a first mode of digital word signals, each digital word signal consisting of a word synchronizing signal and data signals having a first plurality of "data channels of data sampled at a first sampling frequency; means for generating a second mode of digital word signals, each digital word signal consisting of a word synchronizing signal and data signals having a second plurality of data channels of data sampled at a second sampling frequency; and means for selectively transmitting said first mode . of digital word signals and said second mode of digital word signals through a transmission line.
Claim 10
Dependent Claim
107 words
A digital signal transmitting system comprising: means for generating a first mode of digital word signals, each digital word signal consisting of a word synchronizing signal and data signals having a first plurality of "data channels of data sampled at a first sampling frequency; means for generating a second mode of digital word signals, each digital word signal consisting of a word synchronizing signal and data signals having a second plurality of data channels of data sampled at a second sampling frequency; and means for selectively transmitting said first mode . of digital word signals and said second mode of digital word signals through a transmission line.
Claim 11
Dependent Claim
49 words
A digital signal transmitting system according to claim 8, in which said transmission line comprises a cable television transmission line and in which one of said first and second modes of digital word signals is amplitude modulated on a carrier frequency and transmitted on said cable television transmission line.
Claim 12
Dependent Claim
45 words
A digital signal transmitting system according to claim 9, in which said first mode of digital word signals includes left channel and right channel stereo signals, said first sampling frequency is 44.1KHz, and said first plurality of data channels includes code words having 16 bits.
Claim 13
Dependent Claim
41 words
A digital signal transmitting system according to claim 9, in which said second mode of digital word signals includes a monaural signal, said second sampling frequency is 22.05KHz, and said second plurality of data channels includes code words having 8 bits.
Claim 14
Dependent Claim
34 words
A digital signal transmitting system according to claim 9, in which each of said first and second modes of digital word signals further includes service bit signals for identifying said first and second modes.
Claim 15
Dependent Claim
187 words
A digital signal receiving system comprising: means for receiving a first mode of digital word signals, each digital word signal consisting of a word synchronizing signal, a first service bit signal, and data signals having a first bit unit produced by a first sampling frequency, and for receiving a second mode of digital word signals, each consisting of a word synchronizing signal, a second service bit signal, and data signals having a second bit unit produced by a second sampling frequency and producing corresponding outputs, respectively; a first demodulator connected to said outputs from said means for receiving for latching said first mode of digital word signals and for converting the latched digital word signals into a corresponding analog signal; and a second demodulator connected to said outputs from said means for receiving for latching said second mode of digital word signals and for converting the latched digital word signals into a corresponding analog signal; charac- terized by mode control means connected to said first and second demodulators for selectively enabling one of said first and second demodulators in response to a mode control signal produced thereby.
Claim 16
Dependent Claim
187 words
A digital signal receiving system comprising: means for receiving a first mode of digital word signals, each digital word signal consisting of a word synchronizing signal, a first service bit signal, and data signals having a first bit unit produced by a first sampling frequency, and for receiving a second mode of digital word signals, each consisting of a word synchronizing signal, a second service bit signal, and data signals having a second bit unit produced by a second sampling frequency and producing corresponding outputs, respectively; a first demodulator connected to said outputs from said means for receiving for latching said first mode of digital word signals and for converting the latched digital word signals into a corresponding analog signal; and a second demodulator connected to said outputs from said means for receiving for latching said second mode of digital word signals and for converting the latched digital word signals into a corresponding analog signal; charac- terized by mode control means connected to said first and second demodulators for selectively enabling one of said first and second demodulators in response to a mode control signal produced thereby.
Claim 17
Dependent Claim
33 words
A digital signal receiving system according to claim 13, in which said mode control means is connected for receiving said first and second service bit signals for producing said mode control signal therefrom.
Claim 18
Dependent Claim
50 words
A digital signal receiving system according to claim 13, in which said means for receiving includes an amplitude demodulator to which a carrier signal amplitude modulated by said first and second modes of digital word signals is supplied from a cable television transmission line through a receiver front end circuit.
References Cited (Backward Citations)
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