US4061980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio receiver with plural converters and frequency control
Assignee: Sony Corp
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Filing: 1976-10-18
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Granted: 1977-12-06
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Expires: 1996-10-18
Abstract
Abstract A radio receiver including first and second frequency converters to produce first and second intermediate frequency signals, a local oscillator generating a first local signal to be supplied to the second frequency converter, a variable frequency oscillator, and a circuit arrangement to produce a second local signal to be supplied to the first frequency converter based upon the first local signal and an output signal of the variable frequency oscillator. The radio receiver also includes a display means to display a received broadcasting wave.
Inventors
- 👤 Tsutomu Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:31
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/26; H03; H03D; H03D7/00; H03D7/16; H03D7/161; H03D7/163; H03J; H03J5/00; H03J5/02; H03J5/0245; H03J5/0272; H03J7/00; H03J7/02; H03J7/04; H03J7/06; H03J7/065
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
202 words
A radio receiver comprising: a. first and second frequency converters for producing first and second intermediate frequency signals; b. a first oscillator for generating a first local signal to be supplied to said second frequency converter; c. a variable frequency oscillator, d. a first mixer for producing a beat signal between said first local signal and an output signal generated by said variable frequency oscillator; e. a variable frequency divider for producing a signal having a predetermined frequency based on said beat signal; f. a second oscillator for generating a reference signal having the frequency same as that of the signal produced by said variable frequency divider; g. a comparison circuit for comparing the phase of said reference signal with that of said signal produced by said variable frequency divider and for producing a control signal; h. a voltage controlled oscillator for generating a second local signal to be supplied to said first frequency converter in response to said control signal; and i. a second mixer which is supplied with the second local signal and beat signal and produces a beat signal between both the signals, said last beat signal produced by said second mixer being supplied to said variable frequency divider.
Claim 2
Dependent Claim
202 words
A radio receiver comprising: a. first and second frequency converters for producing first and second intermediate frequency signals; b. a first oscillator for generating a first local signal to be supplied to said second frequency converter; c. a variable frequency oscillator, d. a first mixer for producing a beat signal between said first local signal and an output signal generated by said variable frequency oscillator; e. a variable frequency divider for producing a signal having a predetermined frequency based on said beat signal; f. a second oscillator for generating a reference signal having the frequency same as that of the signal produced by said variable frequency divider; g. a comparison circuit for comparing the phase of said reference signal with that of said signal produced by said variable frequency divider and for producing a control signal; h. a voltage controlled oscillator for generating a second local signal to be supplied to said first frequency converter in response to said control signal; and i. a second mixer which is supplied with the second local signal and beat signal and produces a beat signal between both the signals, said last beat signal produced by said second mixer being supplied to said variable frequency divider.
Claim 3
Dependent Claim
29 words
A radio receiver according to claim 1 further comprising means for displaying a frequency of a received broadcasting wave based on the output signal from said variable frequency oscillator.
Claim 4
Dependent Claim
101 words
A radio receiver according to claim 1 further comprising a counter circuit for counting the output signal from said variable frequency oscillator, display means for digitally displaying a received frequency by the output from said counter circuit, a circuit for producing a sampling signal in synchronism with a time base signal for said counter circuit, a sampling circuit for sampling the output from said variable frequency oscillator with said sampling signal, and means for making the output from said variable frequency oscillator have an integer multiple frequency of that of said sampling signal based on the output from said sampling circuit.
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) | 1980-12-05 | 1981-06-06 | 1981-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-05 | 1985-06-06 | 1985-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-05 | 1989-06-06 | 1989-12-06 | $7700.00 | Window Closed / Lapsed |