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US4103239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressor for both speech and carrier signals
Assignee: US Philips Corp
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Filing: 1977-05-02
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Granted: 1978-07-25
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Expires: 1997-05-02
Abstract
Abstract A transmitter has a dynamic compressor provided with a dynamic control device and a compression rectifier fed by the signals to be transmitted, whose output signal controls the dynamic control device via a threshold device and also comprises a signal source which supplies a pilot signal, the signal to be transmitted and the pilot signal being fed to the input of the dynamic control device.
Inventors
- 👤 Willem Douwe Meewezen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:18
CPC Classifications
H; H03; H03G; H03G7/00; H04; H04B; H04B1/00; H04B1/62; H04B1/64
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
A transmitter comprising a dynamic compressor having a dynamic control device and a compression rectifier fed by the signals to be transmitted, a threshold device coupled between said rectifier and said control device, a carrier signal source which supplies a pilot signal, the signal to be transmitted and the pilot signal being supplied to the dynamic control device, the dynamic control device comprising an input circuit including an amplitude modulator coupled to said signal source, the signal to be transmitted being applied to said modulator for generating at an angle a double-sideband signal with suppressed carrier, said input circuit including a combination device means coupled to the modulator output and to said signal source for combining the double-sideband modulated signal said control device further comprises amplitude control means coupled to said combination and threshold devices and the pilot signal.
Claim 2
Dependent Claim
139 words
A transmitter comprising a dynamic compressor having a dynamic control device and a compression rectifier fed by the signals to be transmitted, a threshold device coupled between said rectifier and said control device, a carrier signal source which supplies a pilot signal, the signal to be transmitted and the pilot signal being supplied to the dynamic control device, the dynamic control device comprising an input circuit including an amplitude modulator coupled to said signal source, the signal to be transmitted being applied to said modulator for generating at an angle a double-sideband signal with suppressed carrier, said input circuit including a combination device means coupled to the modulator output and to said signal source for combining the double-sideband modulated signal said control device further comprises amplitude control means coupled to said combination and threshold devices and the pilot signal.
Claim 3
Dependent Claim
17 words
A transmitter as claimed in claim 1 wherein said amplitude control means comprises an adjustable attenuation network.
Claim 4
Dependent Claim
53 words
A transmitter as claimed in claim 2, wherein the transmitter comprises a 90° phase shifting network coupled between said source and said combination device by means of which the carrier signal supplied to the modulator and to the combination device shows a mutual phase difference of 90° for obtaining a quadrature-modulated output signal.
Claim 5
Dependent Claim
123 words
A transmitter as claimed in claim 3, wherein the signals to be transmitted are speech signals in a frequency band of 300 to 3400 Hz and further comprising a limiter receiving said speech signals and coupled to the dynamic compressor and having a control characteristic so that the level of the quadrature-modulated signal supplied to the adjustable attenuation network of the compressor is compressed to a level which is a given amount lower relative to the quadrature-modulated signal corresponding to the maximum input signal level, the level of the carrier signal which is supplied to the adjustable attenuation network corresponding to this level, the carrier signal being compressed in the compressor in accordance with the instantaneous degree of compression of the speech signal.
Claim 6
Dependent Claim
14 words
A transmitter as claimed in claim 4, wherein said given amount is 20 decibels.
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) | 1981-07-24 | 1982-01-23 | 1982-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-24 | 1986-01-23 | 1986-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-24 | 1990-01-23 | 1990-07-25 | $7700.00 | Window Closed / Lapsed |