US4969207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio receiver with reception deterioration compensation
Assignee: NTT Docomo Inc
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Filing: 1988-03-17
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Granted: 1990-11-06
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Expires: 2008-03-17
Abstract
Abstract A receiver for receiving angle-modulated radio signals includes detecting occurrence of interference from adjacent channels when an evelope of demodulated signal of the received radio signals exceeds a threshold. This receiver improves the quality of received signals, attenuates them, limits the amplitude thereof, or blocks them and to insert interpolation signals in replacement thereof when the detection output is transmitted thereto.
Inventors
- 👤 Masayuki Sakamoto
- 👤 Isao Shimizu
- 👤 Seizo Onoe
- 👤 Mitsuru Murata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:51
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/34; H03G3/345; H04; H04B; H04B17/00; H04B17/20; H04B17/25; H04B17/255
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A radio receiver of the type which uses one of plural radio channels arranged at a frequency interval and which receives angle-modulated signals transmitted to said one radio channel, and has a demodulator which demodulates the angle-modulated signal comprising: a circuit to detect deterioration in reception performance when an envelope of the demodulator output obtained by demodulating angle-modulated signals exceeds a threshold; a means to process received signals in accordance with a detection output from said circuit; wherein the means to process received signals includes a switch which becomes an open circuit with the output from the detector which passes the signals and detects deterioration in reception performance, and an interpolation circuit which outputs interpolation signals of the received signals in replacement thereof when the switch is open.
Claim 2
Dependent Claim
128 words
A radio receiver of the type which uses one of plural radio channels arranged at a frequency interval and which receives angle-modulated signals transmitted to said one radio channel, and has a demodulator which demodulates the angle-modulated signal comprising: a circuit to detect deterioration in reception performance when an envelope of the demodulator output obtained by demodulating angle-modulated signals exceeds a threshold; a means to process received signals in accordance with a detection output from said circuit; wherein the means to process received signals includes a switch which becomes an open circuit with the output from the detector which passes the signals and detects deterioration in reception performance, and an interpolation circuit which outputs interpolation signals of the received signals in replacement thereof when the switch is open.
Claim 3
Dependent Claim
34 words
The radio receiver as claimed in claim 1 wherein the interpolation circuit includes a circuit which repeats the waveform of the signal received immediately before the switch became an open circuit in output therefrom.
Claim 4
Dependent Claim
21 words
The radio receiver as claimed in claim 1 wherein the received signals are speech signals obtained by demodulating the angle-modulated signals.
Claim 5
Dependent Claim
120 words
A radio receiver of the type which uses one of plural radio channels arranged at a frequency interval and which receives angle-modulated signals transmitted to said one radio channel, and has a demodulator which demodulates the angle-modulated signal comprising: a circuit to detect deterioration in reception performance when an envelope of the demodulator output obtained by demodulating angle-modulated signals exceeds a threshold; and a means to process received signal in accordance with a detection output from said circuit; wherein the means to process received signals includes a means to correct errors of digital signals which have been encoded for error correction regarding the position where the error occurs as identical to the position where the deterioration of reception performance occurs.
Claim 6
Dependent Claim
120 words
A radio receiver of the type which uses one of plural radio channels arranged at a frequency interval and which receives angle-modulated signals transmitted to said one radio channel, and has a demodulator which demodulates the angle-modulated signal comprising: a circuit to detect deterioration in reception performance when an envelope of the demodulator output obtained by demodulating angle-modulated signals exceeds a threshold; and a means to process received signal in accordance with a detection output from said circuit; wherein the means to process received signals includes a means to correct errors of digital signals which have been encoded for error correction regarding the position where the error occurs as identical to the position where the deterioration of reception performance occurs.
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) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |