US5148280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereo fm radio in a television receiver
Assignee: Technicolor USA Inc
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Filing: 1990-08-06
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Granted: 1992-09-15
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Expires: 2010-08-06
Abstract
Abstract A television receiver includes a single tuner for tuning both television channels and broadcast FM stations. The tuner is operated at a fixed gain setting in FM reception mode. The tuner serves as the first conversion stage of a double conversion FM receiver, wherein the mixer of an FM radio integrated circuit serves as the second conversion stage. The arrangement operates at a specific and non-arbitrary first IF frequency. The FM receiver is also capable of automatically receiving National Weather Service broadcasts on that one of NWS's seven allocated frequencies which is operating in a listener's area. The receiver provides an on-screen display of the currently tuned FM channel number.
Inventors
- 👤 Leroy S. Wignot
- 👤 Kevin E. Nortrup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:37
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/60; G; G06; G06F; G06F13/00; G06F13/14; G06F13/20; G06F13/28; H04B; H04B1/00; H04B1/06; H04B1/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
217 words
A television receiver, comprising: tuner means for operating in a first mode for receiving television RF signals, said tuner means selecting a particular television RF signal from a plurality of television RF signals in response to a control signal; said tuner means also operating in a second mode as a first frequency conversion stage for a double conversion broadcast FM radio signal receiver, for receiving broadcast FM radio RF signals, said tuner means selecting a particular broadcast FM radio RF signal from a plurality of broadcast FM radio RF signals in response to said control signal, and for converting said particular broadcast FM radio RF signal to a first intermediate frequency; control means for generating said control signal for causing said tuner means to select one of said particular television RF signal and said particular broadcast FM radio RF signal; a second frequency conversion stage of said double conversion broadcast FM radio signal receiver, said second frequency conversion stage receiving said broadcast FM radio signal at said first intermediate frequency and converting said broadcast FM radio signal at said first intermediate frequency to a second intermediate frequency, said second intermediate frequency being other than a television intercarrier sound intermediate frequency; and means for demodulating audio signals from said broadcast FM radio signal at said second intermediate frequency.
Claim 2
Dependent Claim
217 words
A television receiver, comprising: tuner means for operating in a first mode for receiving television RF signals, said tuner means selecting a particular television RF signal from a plurality of television RF signals in response to a control signal; said tuner means also operating in a second mode as a first frequency conversion stage for a double conversion broadcast FM radio signal receiver, for receiving broadcast FM radio RF signals, said tuner means selecting a particular broadcast FM radio RF signal from a plurality of broadcast FM radio RF signals in response to said control signal, and for converting said particular broadcast FM radio RF signal to a first intermediate frequency; control means for generating said control signal for causing said tuner means to select one of said particular television RF signal and said particular broadcast FM radio RF signal; a second frequency conversion stage of said double conversion broadcast FM radio signal receiver, said second frequency conversion stage receiving said broadcast FM radio signal at said first intermediate frequency and converting said broadcast FM radio signal at said first intermediate frequency to a second intermediate frequency, said second intermediate frequency being other than a television intercarrier sound intermediate frequency; and means for demodulating audio signals from said broadcast FM radio signal at said second intermediate frequency.
Claim 3
Dependent Claim
14 words
The television receiver of claim 1, wherein said second intermediate frequency is 10.7 MHz.
Claim 4
Dependent Claim
22 words
The television receiver of claim 2, wherein said second frequency conversion stage is an element of an FM radio receiver integrated circuit.
Claim 5
Dependent Claim
33 words
The television receiver of claim 1, wherein during said second mode of operation said television receiver generates video signals which when displayed on a display screen produce a display of a uniform color.
Claim 6
Dependent Claim
12 words
The television receiver of claim 4, wherein said uniform color is black.
Claim 7
Dependent Claim
40 words
The television receiver of claim 1, wherein during a predetermined period of said second mode of operation said television receiver generates video signals which when displayed on a display screen produce characters indicative of the currently tuned FM radio station.
Claim 8
Dependent Claim
65 words
The television receiver of claim 1, wherein during a predetermined period of said second mode of operation said television receiver generates video signals which when displayed on a display screen produce characters indicative of the currently tuned FM radio station, and during the remaining portion of said second mode of operation generates signals which when displayed on said display screen cause a uniformly blanked display.
Claim 9
Dependent Claim
203 words
A television receiver, comprising: tuner means for operating in a first mode for receiving television RF signals, said tuner means selecting a particular television RF signal from a plurality of television RF signals in response to a control signal and converting said selected RF signal to a television intermediate frequency (IF) signal; means for demodulating said television IF signal to produce a television audio signal; control means for generating said control signal for causing said tuner means to select said particular RF signal; said tuner means also operating in a second mode as a first frequency conversion stage for a double conversion broadcast FM stereo radio signal receiver, for converting a FM stereo signal to a first intermediate frequency; a second frequency conversion stage of said double conversion broadcast FM radio signal receiver, said second frequency conversion stage receiving said FM stereo signal at said first intermediate frequency and converting said FM stereo signal to a second intermediate frequency; means for demodulating audio signals from said FM stereo signal at said second intermediate frequency and to produce demodulated FM stereo audio signals; and means for selecting for amplification and reproduction one of said television audio signal and said demodulated FM stereo audio signals.
Claim 10
Dependent Claim
203 words
A television receiver, comprising: tuner means for operating in a first mode for receiving television RF signals, said tuner means selecting a particular television RF signal from a plurality of television RF signals in response to a control signal and converting said selected RF signal to a television intermediate frequency (IF) signal; means for demodulating said television IF signal to produce a television audio signal; control means for generating said control signal for causing said tuner means to select said particular RF signal; said tuner means also operating in a second mode as a first frequency conversion stage for a double conversion broadcast FM stereo radio signal receiver, for converting a FM stereo signal to a first intermediate frequency; a second frequency conversion stage of said double conversion broadcast FM radio signal receiver, said second frequency conversion stage receiving said FM stereo signal at said first intermediate frequency and converting said FM stereo signal to a second intermediate frequency; means for demodulating audio signals from said FM stereo signal at said second intermediate frequency and to produce demodulated FM stereo audio signals; and means for selecting for amplification and reproduction one of said television audio signal and said demodulated FM stereo audio signals.
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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) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |