Patent EP0486874A2 successfully refreshed from Google Patents.
EP0486874A2
Expired / Lapsed
EP
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Multiplex digital communication system for transmitting channel identification information
Assignee: Mitsubishi Electric Corp
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Filing: 1991-11-06
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Granted: —
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Expires: 2011-11-06
Abstract
Abstract Multiplex communication system for transmitting different signals through a plurality of channels comprises a transmitter and a receiver. The transmitter comprises a transmitting section for multiplexing and transmitting the different signals through the plurality of channels, and an adder for adding channel identification signals for identifying the respective channels to the signals to be transmitted through the respective channels. The receiver comprises a setting device for setting a desired channel, a detector for detecting the channel identification signals from the signals transmitted from the transmitter, and a channel selector for selecting the channel signal preset by the setting device in accordance with the outputs of the setting device and the detector.
Inventors
- 👤 Takashi Tsushin System Kenkyusho Mizuochi
- 👤 Susumu Tsushin System Kenkyusho Sato
- 👤 Hiroshi Tsushin System Kenkyusho Ichibangase
- 👤 Tadayoshi Tsushin System Kenkyusho Kitayama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 18:48
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/236; H04N21/2365; H04J; H04J3/00; H04J3/02; H04J3/12; H04N21/40; H04N21/43; H04N21/434; H04N21/4347; H04N7/00; H04N7/08; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04J2203/00; H04J2203/0001; H04J2203/0089
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A multiplex communication system for transmitting different signals through a plurality of channels, comprising: transmitting means including a transmitting section for multiplexing and transmitting the signals through the plurality of channels, and adding means for adding channel identification signals for identifying the respective channels to the signals to be transmitted through the respective channels; and receiving means including setting means for setting a desired channel, detecting means for detecting the channel identification signals from the signals transmitted from said transmitting means, and channel selecting means for selecting the signal of the channel set by said setting means in accordance with the outputs of said setting means and said detecting means.
Claim 2
Dependent Claim
110 words
A multiplex communication system for transmitting different signals through a plurality of channels, comprising: transmitting means including a transmitting section for multiplexing and transmitting the signals through the plurality of channels, and adding means for adding channel identification signals for identifying the respective channels to the signals to be transmitted through the respective channels; and receiving means including setting means for setting a desired channel, detecting means for detecting the channel identification signals from the signals transmitted from said transmitting means, and channel selecting means for selecting the signal of the channel set by said setting means in accordance with the outputs of said setting means and said detecting means.
Claim 3
Dependent Claim
137 words
A frequency-division multiplex communication system comprising: transmitting means comprising a frequency-division multiplex transmitting section for frequency-division multlplexing and transmitting digital signals of a plurality of channels to the transmission line in the form of a frame, and inserting means for inserting carrier information for identifying the respective channels to predetermined areas of the respective frames; and receiving means comprising a receiving section for receiving the frequency-division multiplexed digital signals from the transmission line, reading means for reading the carrier information out of the digital signals received by said receiving section, setting means for setting a desired channel, and oscillating means for oscillating a frequency determined by the outputs of said reading means and said setting means, thereby receiving the digital signal of the channel preset by said setting means utilizing the frequency produced by said oscillating means.
Claim 4
Dependent Claim
137 words
A frequency-division multiplex communication system comprising: transmitting means comprising a frequency-division multiplex transmitting section for frequency-division multlplexing and transmitting digital signals of a plurality of channels to the transmission line in the form of a frame, and inserting means for inserting carrier information for identifying the respective channels to predetermined areas of the respective frames; and receiving means comprising a receiving section for receiving the frequency-division multiplexed digital signals from the transmission line, reading means for reading the carrier information out of the digital signals received by said receiving section, setting means for setting a desired channel, and oscillating means for oscillating a frequency determined by the outputs of said reading means and said setting means, thereby receiving the digital signal of the channel preset by said setting means utilizing the frequency produced by said oscillating means.
Claim 5
Dependent Claim
141 words
A frequency-division multiplex communication system according to claim 2, wherein said digital signals are transmitted from said transmitting means to said receiving means by light, said oscillating means comprises a variable wavelength laser diode which radiates a local oscillation laser beam, and said receiving section comprises a photo-coupler which receives a signal beam transmitted from said transmitting means at one input and also receives the local oscillating signal beam from said laser diode at another input, arithmetic means responsive to the outputs of said reading means and said setting means for outputting the signal for computing an oscillation frequency of said laser diode which is required to extract the signal of the channel preset by said setting means so as to output a signal designating the oscillation frequency, and driving means for driving said laser diode in accordance with designating signal.
Claim 6
Dependent Claim
79 words
A frequency-division multiplex communication system according to claim 3, further comprising a memory storing a relationship between the oscillation frequency of said laser diode and a current driving said laser diode, and wherein said arithmetic means is a microprocessor which computes a frequency to be oscillated by said laser diode in response to the outputs of said setting means and said reading means to output the designating signal by reading a current corresponding to the frequency from said memory.
Claim 7
Dependent Claim
150 words
A time-division multiplex communication system for transmitting digital signals of a plurality of channels in the form of a frame, comprising: transmitting means comprising an identification signal inserting section for inserting, to the frames of the channels, identification signals for identifying the channels through which the digital signals are transmitted and multiplex means for time-division multiplexing the signals to which the identification signals have been inserted, thereby transmitting such multiplexed signals to the transmission line; and receiving means comprising a receiving section for receiving the time-division multiplex digital signals from the transmission line, detecting means for detecting the identification signals from the digital signals received from said receiving section, setting means for setting a desired channel, and selecting means for selecting the desired channel in response to the outputs of said detecting means and said setting means, thereby receiving the digital signal of the channel preset by said setting means.
Claim 8
Dependent Claim
150 words
A time-division multiplex communication system for transmitting digital signals of a plurality of channels in the form of a frame, comprising: transmitting means comprising an identification signal inserting section for inserting, to the frames of the channels, identification signals for identifying the channels through which the digital signals are transmitted and multiplex means for time-division multiplexing the signals to which the identification signals have been inserted, thereby transmitting such multiplexed signals to the transmission line; and receiving means comprising a receiving section for receiving the time-division multiplex digital signals from the transmission line, detecting means for detecting the identification signals from the digital signals received from said receiving section, setting means for setting a desired channel, and selecting means for selecting the desired channel in response to the outputs of said detecting means and said setting means, thereby receiving the digital signal of the channel preset by said setting means.
Claim 9
Dependent Claim
59 words
A time-division multiplex communication system according to claim 5, wherein said selecting means decides whether the output of said detecting means coincides with the output of said setting means, extracts the output of said receiving section when those outputs are coincided and shifts, if those outputs do not coincide, the output of said receiving section until those outputs coincide.
References Cited (Backward Citations)
No citation records indexed.
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