US3789148A
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Multiplex transmission method
Assignee: Nissan Motor Co Ltd
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Filing: 1971-02-03
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Granted: 1974-01-29
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Expires: 1991-02-03
Abstract
Abstract A multiplex transmission method using a plurality of carrier signals each of which is not correlated with one another. The carrier signals are derived from e.g., an irregular signal. Each of the carrier signals is modulated with an information signal by multiplying the former with the latter. Thereafter, the thus modulated carrier signals are demodulated by cross-correlating the sum of the modulated carrier signals and each of the original carrier signals, which is equal to the average energy of the product over one period, thereby to reproduce the information signal.
Inventors
- 👤 Y Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:44
CPC Classifications
H; H04; H04J; H04J13/00; H04J13/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
146 words
A multiplex transmission method comprising generating at least one reference signal, supplying said reference signal to at least one reference signal bus line, picking up said reference signal from said reference signal bus line, converting said reference signal into a plurality of carrier signals which are non-correlated with one another, producing a first set of product signals each from one of said carrier signals and a given information signal, supplying said first set of product signals to at least one carrier signal bus line, picking up said first set of product signals from said carrier signal bus line and picking up said reference signal from said reference signal bus line, converting said reference signal into said one of the carrier signals, correlating the sum of the picked up first set of product signals and said one of the carrier signals to thereby reproduce said information signal.
Claim 2
Dependent Claim
146 words
A multiplex transmission method comprising generating at least one reference signal, supplying said reference signal to at least one reference signal bus line, picking up said reference signal from said reference signal bus line, converting said reference signal into a plurality of carrier signals which are non-correlated with one another, producing a first set of product signals each from one of said carrier signals and a given information signal, supplying said first set of product signals to at least one carrier signal bus line, picking up said first set of product signals from said carrier signal bus line and picking up said reference signal from said reference signal bus line, converting said reference signal into said one of the carrier signals, correlating the sum of the picked up first set of product signals and said one of the carrier signals to thereby reproduce said information signal.
Claim 3
Dependent Claim
60 words
A method according to claim 1, wherein the step of converting said reference signal into said plurality of carrier signals comprises producing from said reference signal a plurality of carrier signals non-correlated with each other, and multiplying at least two of said carrier signals by each other for producing a plurality of carrier signals different from the first-named carrier signals.
Claim 4
Dependent Claim
14 words
A method according to claim 1, wherein said reference signal comprises a random signal.
Claim 5
Dependent Claim
14 words
A method according to claim 3, wherein said irregular signal comprises a pseudo-random signal.
Claim 6
Dependent Claim
50 words
A method according to claim 3, wherein said step of converting said random signal into a plurality of carrier signals comprises delaying said reference signal by a plurality of time periods different from each other, said time periods greater than the width of the autocorrelation function of said reference signal.
Claim 7
Dependent Claim
30 words
A method according to claim 4, wherein said reference signal comprises a product signal of said pseudo-random signal and a clock pulse train from which said pseudo-irregular signal is derived.
Claim 8
Dependent Claim
129 words
A multiplex transmission system comprising first means for generating at least one reference signal and applying same to at least one reference signal bus line second means receptive of said reference signal for converting said reference signal into carrier signals which are non-correlated with one another and for developing a first set of product signals comprising the product of one of said carrier signals and a given information signal, third means receptive of said first set of product signals for converting said reference signal into one of the said carrier signals and for developing a second set of product signals comprising the product of said first set of product signals and said one of the carrier signal for developing said second set of product thereby reproducing said information signal.
Claim 9
Dependent Claim
129 words
A multiplex transmission system comprising first means for generating at least one reference signal and applying same to at least one reference signal bus line second means receptive of said reference signal for converting said reference signal into carrier signals which are non-correlated with one another and for developing a first set of product signals comprising the product of one of said carrier signals and a given information signal, third means receptive of said first set of product signals for converting said reference signal into one of the said carrier signals and for developing a second set of product signals comprising the product of said first set of product signals and said one of the carrier signal for developing said second set of product thereby reproducing said information signal.
Claim 10
Dependent Claim
51 words
A multiplex transmission system according to claim 7, wherein said first means comprises a noise generator, a shaper connected to said noise generator, a sample-holder connected to said shaper, a clock pulse generator connected to said sample-holder circuit and a first multiplier connected to said sample-holder and said clock pulse generator.
Claim 11
Dependent Claim
39 words
A multiplex transmission system according to claim 7, wherein said first means comprises a clock pulse generator, an M-sequence generator connected to said clock pulse generator a second multiplier connected to said clock pulse generator and said M-sequence generator.
Claim 12
Dependent Claim
45 words
A multiplex transmission system according to claim 7, wherein said second means comprises a delaying circuit, a third multiplier connected to said delaying circuit for multiplying an output signal of said delaying circuit by said information signal and an amplifier connected to said third multiplier.
Claim 13
Dependent Claim
44 words
A multiplex transmission system according to claim 7, wherein said third means comprises a delaying circuit having the same delay time as that of said second means, a fourth multiplier connected to said delaying circuit and a smoothing filter connected to said fourth multiplier.
Claim 14
Dependent Claim
51 words
A multiplex transmission system according to claim 10, wherein said delaying circuit comprises a full-wave rectifier, a flip-flop circuit connected to said full-wave rectifier, a shift-register connected to said flip-flop circuit and said full-wave rectifier, a fifth multiplier connected to said shift-register and a biasing circuit connected to said fifth multiplier.
Claim 15
Independent Claim
251 words
A method for multiplexing data transmission comprising: generating a reference signal having an autocorrelation function characteristic such that the maximum value results when the delay time between said reference signal and its delayed replica equals zero and the minimum value results when the delay time is not less than a predetermined value; transmitting said reference signals to a first plurality of transmitters and a second plurality of receivers; delaying said reference signal in each of said transmitters wherein each delay time differs from the other delay times by at least said predetermined value thereby developing a plurality of carrier signals equal in number to said first plurality of transmitters; multiplying each carrier signal with an information signal associated with the corresponding transmitter thereby generating product signals; summing the first plurality of product signals; transmitting the sum of said first plurality of product signals to each of said receivers; delaying said reference signal in each of said receivers for a delay time corresponding to the delay time of the corresponding transmitter; correlating said sum of said first plurality of product signals and said delayed reference signal thereby reproducing the corresponding information signal in each of said receivers, the correlation representing the autocorrelation of one pair of equally delayed reference signals and the autocorrelation of unequally delayed reference signals thereby obtaining both the product of the corresponding information signal and said maximum value of said autocorrelation function and the product of the other information signals and said minimum value of said autocorrelation function.
Claim 16
Independent Claim
251 words
A method for multiplexing data transmission comprising: generating a reference signal having an autocorrelation function characteristic such that the maximum value results when the delay time between said reference signal and its delayed replica equals zero and the minimum value results when the delay time is not less than a predetermined value; transmitting said reference signals to a first plurality of transmitters and a second plurality of receivers; delaying said reference signal in each of said transmitters wherein each delay time differs from the other delay times by at least said predetermined value thereby developing a plurality of carrier signals equal in number to said first plurality of transmitters; multiplying each carrier signal with an information signal associated with the corresponding transmitter thereby generating product signals; summing the first plurality of product signals; transmitting the sum of said first plurality of product signals to each of said receivers; delaying said reference signal in each of said receivers for a delay time corresponding to the delay time of the corresponding transmitter; correlating said sum of said first plurality of product signals and said delayed reference signal thereby reproducing the corresponding information signal in each of said receivers, the correlation representing the autocorrelation of one pair of equally delayed reference signals and the autocorrelation of unequally delayed reference signals thereby obtaining both the product of the corresponding information signal and said maximum value of said autocorrelation function and the product of the other information signals and said minimum value of said autocorrelation function.
Claim 17
Dependent Claim
249 words
A data transmission multiplexon comprising: means for generating a reference signal having an autocorrelation function characteristic such that the maximum value results when the delay time between said reference signal and its delayed replica equals zero and the minimum value results when the delay time is not less than a predetermined value; a first plurality of transmitter means for developing a first plurality of carrier signals and each receptive of said reference signal and each having means for delaying said reference signal for a predetermined delay time, each delay time differing from another by at least said predetermined value, and means for multiplying said delayed reference signal by an information signal associated with the transmitter means to thereby develop a product signal; means for summing the first plurality of product signals; a second plurality of receiving means each receptive of both the sum of said first plurality of product signals and said reference signal for reproducing one information signal, each receiver means having means for delaying said reference signal for a predetermined time corresponding to the delay time of the associated transmitter means, and means for correlating the delayed reference signal and said sum of said product signals which represents the autocorrelation of equally delayed reference signals and the autocorrelation of unequally delayed reference signals thereby obtaining both the product of said one information signal and said maximum value of said autocorrelation function and the product of the other information signals and said minimum value of said autocorrelation funCtion.
Claim 18
Dependent Claim
249 words
A data transmission multiplexon comprising: means for generating a reference signal having an autocorrelation function characteristic such that the maximum value results when the delay time between said reference signal and its delayed replica equals zero and the minimum value results when the delay time is not less than a predetermined value; a first plurality of transmitter means for developing a first plurality of carrier signals and each receptive of said reference signal and each having means for delaying said reference signal for a predetermined delay time, each delay time differing from another by at least said predetermined value, and means for multiplying said delayed reference signal by an information signal associated with the transmitter means to thereby develop a product signal; means for summing the first plurality of product signals; a second plurality of receiving means each receptive of both the sum of said first plurality of product signals and said reference signal for reproducing one information signal, each receiver means having means for delaying said reference signal for a predetermined time corresponding to the delay time of the associated transmitter means, and means for correlating the delayed reference signal and said sum of said product signals which represents the autocorrelation of equally delayed reference signals and the autocorrelation of unequally delayed reference signals thereby obtaining both the product of said one information signal and said maximum value of said autocorrelation function and the product of the other information signals and said minimum value of said autocorrelation funCtion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |