Patent US3602818A successfully refreshed from Google Patents.
US3602818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delay line amplitude compression transmission system
Assignee: US Philips Corp
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Filing: 1969-05-19
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Granted: 1971-08-31
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Expires: 1989-05-19
Abstract
Abstract An amplitude compression-expansion circuit features a cotransmitted control signal that indicates the degree of compression at the transmitter for use at the receiver to control the degree of expansion. The compression control signal is applied to the compressor through a delay line, while the receiver features two expandors.
Inventors
- 👤 Germain Francois Loui Carrette
- 👤 Michel Jules Phile Christiaens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:24
CPC Classifications
B; B60; B60P; B60P3/00; B60P3/32; B60P3/36; H; H04; H04B; H04B1/00; H04B1/68
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
172 words
A transmitter comprising a source of information signAls; a compandor having an input coupled to said information signal source, an output, and a control terminal; a source of control signals having a frequency different from said information signals coupled to said compandor input; a time demodulator having an input coupled to said control signal source and an output; means for time delay having an input coupled to said demodulator output and an output coupled to said control signal source and an output; means for time delay having an input coupled to said demodulator output and an output coupled to said control terminal; a difference signal producer having a first input coupled to said demodulator output, a second input, and an output; a rectifier having an input coupled to said information signal source and an output coupled to said difference producer second input; a time modulator having an input coupled to said difference-signal producer output and an output coupled to said control signal source; and means for transmitting the output of the compandor.
Claim 2
Dependent Claim
172 words
A transmitter comprising a source of information signAls; a compandor having an input coupled to said information signal source, an output, and a control terminal; a source of control signals having a frequency different from said information signals coupled to said compandor input; a time demodulator having an input coupled to said control signal source and an output; means for time delay having an input coupled to said demodulator output and an output coupled to said control signal source and an output; means for time delay having an input coupled to said demodulator output and an output coupled to said control terminal; a difference signal producer having a first input coupled to said demodulator output, a second input, and an output; a rectifier having an input coupled to said information signal source and an output coupled to said difference producer second input; a time modulator having an input coupled to said difference-signal producer output and an output coupled to said control signal source; and means for transmitting the output of the compandor.
Claim 3
Dependent Claim
29 words
A transmitter as claimed in claim 1 wherein said time delay means has a time delay substantially equal to the system time differences between said information and control signals.
Claim 4
Dependent Claim
134 words
A receiver comprising means for receiving a signal having information and control signal components; a first compandor having an input coupled to said receiving means, an output, and a control terminal; filter means for selecting said control signal having an input coupled to said receiving means and an output; a time demodulator having an input coupled to said filter output and an output; a second compandor coupled between said receiving means and said first compandor and having a control terminal coupled to said time demodulator output; a difference signal producer having a first input coupled to said demodulator output; a second input and an output coupled to said control terminal; a rectifier coupled between said first compandor output and said difference producer second input, and an output circuit coupled to said first compandor output.
Claim 5
Dependent Claim
134 words
A receiver comprising means for receiving a signal having information and control signal components; a first compandor having an input coupled to said receiving means, an output, and a control terminal; filter means for selecting said control signal having an input coupled to said receiving means and an output; a time demodulator having an input coupled to said filter output and an output; a second compandor coupled between said receiving means and said first compandor and having a control terminal coupled to said time demodulator output; a difference signal producer having a first input coupled to said demodulator output; a second input and an output coupled to said control terminal; a rectifier coupled between said first compandor output and said difference producer second input, and an output circuit coupled to said first compandor output.
Claim 6
Dependent Claim
22 words
A receiver as claimed in claim 3 further comprising a low pass filter coupled between said rectifier and said difference signal producer.
Claim 7
Dependent Claim
291 words
A transmission system comprising a transmitter and receiver coupled thereto, said transmitter comprising a source of information; a compandor having an input coupled to said information signal source, an output, and a control terminal; a source of control signals having a frequency different from said information signals coupled to said compandor input; a time demodulator having an input coupled to said control signal source and an output; means for time delay having an input coupled to said demodulator output and an output coupled to said control terminal; a difference signal producer having a first input coupled to said demodulator output, a second input, and an output; a rectifier having an input coupled to said information signal source and an output coupled to said difference producer second input; a time modulator having an input coupled to said difference-signal producer output and an output coupled to said control signal source; and means for transmitting the output of the compandor; said receiver comprising means for receiving a signal having information and control signal components; a first compandor having an input coupled to said receiving means, an output, and a control terminal; filter means for selecting said control signal having an input coupled to said receiving means and an output; a time demodulator having an input coupled to said filter output and an output; a second compandor coupled between said receiving means and said first compandor and having a control terminal coupled to said time demodulator output; a difference signal producer having a first input coupled to said demodulator output, a second input, and an output coupled to said control terminal; a rectifier coupled between said first compandor output and said difference producer second input, and an output circuit coupled to sAid first compandor output.
Claim 8
Dependent Claim
291 words
A transmission system comprising a transmitter and receiver coupled thereto, said transmitter comprising a source of information; a compandor having an input coupled to said information signal source, an output, and a control terminal; a source of control signals having a frequency different from said information signals coupled to said compandor input; a time demodulator having an input coupled to said control signal source and an output; means for time delay having an input coupled to said demodulator output and an output coupled to said control terminal; a difference signal producer having a first input coupled to said demodulator output, a second input, and an output; a rectifier having an input coupled to said information signal source and an output coupled to said difference producer second input; a time modulator having an input coupled to said difference-signal producer output and an output coupled to said control signal source; and means for transmitting the output of the compandor; said receiver comprising means for receiving a signal having information and control signal components; a first compandor having an input coupled to said receiving means, an output, and a control terminal; filter means for selecting said control signal having an input coupled to said receiving means and an output; a time demodulator having an input coupled to said filter output and an output; a second compandor coupled between said receiving means and said first compandor and having a control terminal coupled to said time demodulator output; a difference signal producer having a first input coupled to said demodulator output, a second input, and an output coupled to said control terminal; a rectifier coupled between said first compandor output and said difference producer second input, and an output circuit coupled to sAid first compandor output.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |