US3783383A
Expired / Lapsed
US
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Low disparity bipolar pcm system
Assignee: Alcatel Lucent NV
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Filing: 1972-05-10
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Granted: 1974-01-01
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Expires: 1992-05-10
Abstract
Abstract There is disclosed herein a signalling process for a PCM transmission system having reduced disparity, that is, a substantially equal number of binary ''''1'''' digits for the pulse stream. This is accomplished by complementing normal PCM words if the number of binary ''''1''''s in a word are less than n/2, where n is equal to the number of digits per word, and using alternatepolarity bipolar code PCM transmission. In accordance with the present invention the complementing of PCM words is indicated by a polarity violation of the bipolar code of the first digit of the complemented words. This results in two pulses of the same polarity being adjacent each other rather than alternate polarity as is usual in alternate-polarity bipolar PCM. Transmission and reception circuits are also disclosed to implement the PCM signalling process of this invention.
Inventors
- 👤 D Forster
- 👤 J Perrault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:58
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4917; H04L25/4923; H04L25/4925; H04L7/00; H04L7/02; H04L7/04; H04L7/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
320 words
A transmitter circuit for a PCM transmission system using alternate polarity bipolar code and disparity reduction comprising: a source of binary words to be transmitted according to said bipolar code; first means coupled to said source for determining the number of binary ''''1''''s in each of said words, said first means producing a first control signal when the number of binary ''''1''''s present in said words is less than n/2, where n is equal to the number of digits of each of said words; second means coupled to said source to store each of said words while said first means determines the number of binary ''''1''''s present in the corresponding one of said words; third means coupled to said first and second means responsive to said first control signal to complement each of said words at the output of said second means responsible for said first means producing said first control signal; fourth means coupled to said first means to produce a second control signal for controlling the polarity of the pulses to be transmitted; fifth means to shape the pulses to be transmitted, said fifth means having two inputs and one output, said output delivering pulses of either polarity depending upon which of said two inputs is excited; and sixth means coupled to said third, fourth and fifth means responsive to said second control signal to selectively excite either of said two inputs by each pulse from said third means; said fourth means including seventh means for alternately controlling said sixth means during the absence of said first control signal, and eighth means coupled to said first means and said seventh means to suppress the operation of said seventh means in response to said first control signal to provide a polarity violation of said bipolar code of one pulse of said words responsible for said first means producing said first control signal at said output of said first means.
Claim 2
Dependent Claim
320 words
A transmitter circuit for a PCM transmission system using alternate polarity bipolar code and disparity reduction comprising: a source of binary words to be transmitted according to said bipolar code; first means coupled to said source for determining the number of binary ''''1''''s in each of said words, said first means producing a first control signal when the number of binary ''''1''''s present in said words is less than n/2, where n is equal to the number of digits of each of said words; second means coupled to said source to store each of said words while said first means determines the number of binary ''''1''''s present in the corresponding one of said words; third means coupled to said first and second means responsive to said first control signal to complement each of said words at the output of said second means responsible for said first means producing said first control signal; fourth means coupled to said first means to produce a second control signal for controlling the polarity of the pulses to be transmitted; fifth means to shape the pulses to be transmitted, said fifth means having two inputs and one output, said output delivering pulses of either polarity depending upon which of said two inputs is excited; and sixth means coupled to said third, fourth and fifth means responsive to said second control signal to selectively excite either of said two inputs by each pulse from said third means; said fourth means including seventh means for alternately controlling said sixth means during the absence of said first control signal, and eighth means coupled to said first means and said seventh means to suppress the operation of said seventh means in response to said first control signal to provide a polarity violation of said bipolar code of one pulse of said words responsible for said first means producing said first control signal at said output of said first means.
Claim 3
Dependent Claim
27 words
A circuit according to claim 1, wherein said one pulse is the first pulse of said words responsible for said first means producing said first control signal.
Claim 4
Dependent Claim
419 words
A PCM transmission system using alternate polarity bipolar code and disparity reduction comprising: a source of binary words to be transmitted according to said bipolar code; first means coupled to said source for determining the number of binary ''''1''''s in each of said words, said first means producing a first control signal when the number of binary ''''1''''s present in said words is less than n/2, where n is equal to the number of digits of each of said words; second means coupled to said source to store each of said words while said first means determines the number of binary ''''1''''s present in the corresponding one of said words; third means coupled to said first and second means responsive to said first control signal to complement each of said words at the output of said second means responsible for said first means producing said first control signal; fourth means coupled to said first means to produce a second control signal for controlling the polarity of the pulse to be transmitted; fifth means to shape the pulses to be transmitted, said fifth means having two inputs and one output, said output delivering pulses for transmission of either polarity according to said bipolar code depending on which of said two inputs is excited; sixth means coupled to said third fourth and fifth means responsive to said second control signal to selectively excite either of said two inputs by each pulse from said third means; said fourth means including seventh means for alternately controlling said sixth means during the absence of said first control signal, and eighth means coupled to said first and said seventh means to suppress the operation of said seventh means in response to said first control signal to provide a polarity violation of said bipolar code of one pulse of said words responsible for said first means producing said first control signal at said output of said first means; ninth means coupled to said fifth means to receive each of said words at said output of said fifth means; tenth means coupled to said ninth means to store each of said words sequentially; eleventh means coupled to said ninth means to detect said polarity violation and producing a third control signal in response to said polarity violation; and twelfth means coupled to said tenth means and said eleventh means responsive to said third control signal to restore those binary words associated with said polarity violation to their original form as present at the output of said source.
Claim 5
Dependent Claim
419 words
A PCM transmission system using alternate polarity bipolar code and disparity reduction comprising: a source of binary words to be transmitted according to said bipolar code; first means coupled to said source for determining the number of binary ''''1''''s in each of said words, said first means producing a first control signal when the number of binary ''''1''''s present in said words is less than n/2, where n is equal to the number of digits of each of said words; second means coupled to said source to store each of said words while said first means determines the number of binary ''''1''''s present in the corresponding one of said words; third means coupled to said first and second means responsive to said first control signal to complement each of said words at the output of said second means responsible for said first means producing said first control signal; fourth means coupled to said first means to produce a second control signal for controlling the polarity of the pulse to be transmitted; fifth means to shape the pulses to be transmitted, said fifth means having two inputs and one output, said output delivering pulses for transmission of either polarity according to said bipolar code depending on which of said two inputs is excited; sixth means coupled to said third fourth and fifth means responsive to said second control signal to selectively excite either of said two inputs by each pulse from said third means; said fourth means including seventh means for alternately controlling said sixth means during the absence of said first control signal, and eighth means coupled to said first and said seventh means to suppress the operation of said seventh means in response to said first control signal to provide a polarity violation of said bipolar code of one pulse of said words responsible for said first means producing said first control signal at said output of said first means; ninth means coupled to said fifth means to receive each of said words at said output of said fifth means; tenth means coupled to said ninth means to store each of said words sequentially; eleventh means coupled to said ninth means to detect said polarity violation and producing a third control signal in response to said polarity violation; and twelfth means coupled to said tenth means and said eleventh means responsive to said third control signal to restore those binary words associated with said polarity violation to their original form as present at the output of said source.
Claim 6
Dependent Claim
72 words
A system according to claim 3, wherein said eleventh means includes thirteenth means coupled to said ninth means for detecting the polarity of the pulses of said words in said bipolar code, and fourteenth means coupled to said thirteenth means to compare the polarity of each two successive pulses of said words in said bipolar code to produce said third control signal when the polarity of saId two successive pulses are identical.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |