US3584141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic tuning device for television receiver
Assignee: Panasonic Holdings Corp
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Filing: 1968-12-16
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Granted: 1971-06-08
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Expires: 1988-12-16
Abstract
Abstract An electronic automatic tuning device for television receivers, wherein in order to enable only a video carrier wave to be tuned in and prevent an audio carrier wave from being tuned in when the received channel is swept by applying an increment of a voltage charged at a capacitor to variable capacitance elements incorporated in the tuner, an input signal resulting from frequency-discrimination of either the video intermediatefrequency signal or the audio intermediate-frequency signal is supplied to an active element for controlling the charging with respect to said capacitor, and the supply of said input signal to said active element is controlled by an element which is adapted to produce switching action with the aid of a signal which is different from said input signal but derived from the same incoming wave.
Inventors
- 👤 Tetsuya Fujiwara
- 👤 Hachiro Omote
- 👤 Katuyoshi Gotou
- 👤 Yoshitoyo Kenjo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:17
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/18; H03J7/20; H03J7/24; H03J7/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
172 words
An automatic tuning television receiver of the type having a plurality of tuner sections responsive to frequencies of individual predetermined frequency bands, said tuner sections including tuning elements and frequency generating elements having variable capacitance elements, comprising, in combination: a sweeping means including a capacitance device operatively associated with said variable capacitance elements, said sweeping means sweeping the receiving frequencies of each of said tuner sections in accordance with the charged voltage of said capacitance device; a switching means for instantaneously discharging said capacitance device when said capacitance device completes one cycle of sweeping operation; an active element connected in parallel with said capacitance device for controlling the terminal voltage of said capacitance device depending upon the operating state of said active element; a frequency discriminator circuit for controlling the operating state of said active element; means for supplying said discriminator circuit with the video intermediate frequency signal of a television signal; and means for consecutively actuating said tuner sections one after another in response to the operation of said switching means.
Claim 2
Dependent Claim
172 words
An automatic tuning television receiver of the type having a plurality of tuner sections responsive to frequencies of individual predetermined frequency bands, said tuner sections including tuning elements and frequency generating elements having variable capacitance elements, comprising, in combination: a sweeping means including a capacitance device operatively associated with said variable capacitance elements, said sweeping means sweeping the receiving frequencies of each of said tuner sections in accordance with the charged voltage of said capacitance device; a switching means for instantaneously discharging said capacitance device when said capacitance device completes one cycle of sweeping operation; an active element connected in parallel with said capacitance device for controlling the terminal voltage of said capacitance device depending upon the operating state of said active element; a frequency discriminator circuit for controlling the operating state of said active element; means for supplying said discriminator circuit with the video intermediate frequency signal of a television signal; and means for consecutively actuating said tuner sections one after another in response to the operation of said switching means.
Claim 3
Dependent Claim
24 words
An automatic tuning television receiver as set forth in claim 1, wherein said circuit means comprises a multivibrator having a plurality of stable states.
Claim 4
Dependent Claim
35 words
An automatic tuning television receiver as set forth in claim 2, wherein said tuner sections comprise a high frequency band tuner section and a low frequency band tuner section alternatively actuated by a bistable multivibrator.
Claim 5
Dependent Claim
99 words
An automatic tuning television receiver as set forth in claim 3, further comprising an indicator associated with said capacitance device and with said bistable multivibrator in such a manner that during the low frequency band sweeping operation the reading of said indicator is no greater than half of the full scale of said indicator, and means supplying a signal voltage obtained from the inversion of the stable state of said bistable multivibrator during the high frequency band sweeping operation to said indicator whereby the reading of said indicator is larger than half of the full scale of said indicator.
Claim 6
Dependent Claim
45 words
An automatic tuning television receiver as set forth in claim 2, wherein said tuner sections comprise a VHF high frequency band tuner section, a VHF low frequency band tuner section and a UHF band tuner section consecutively actuated one After another by a tristable multivibrator.
Claim 7
Dependent Claim
142 words
An automatic tuning television receiver as set forth in claim 5, further comprising an indicator associated with said capacitance device and with said tristable multivibrator in such a manner that during the VHF low frequency band-sweeping operation the reading of said indicator is no greater than half of said indicator; means supplying a signal voltage obtained from a first inversion of the stable state of said tristable multivibrator during the VHF high band-sweeping operation to said indicator, whereby the reading of said indicator is larger than half of the full scale of said indicator; and means supplying a signal voltage obtained from a second inversion of the stable state of said tristable multivibrator during the UHF band sweeping operation to said indicator, whereby the sensitivity of said indicator is twice that during the VHF band-sweeping operation to effect a full scale indication.
Claim 8
Dependent Claim
83 words
An automatic tuning television receiver as set forth in claim 1, further comprising gate means connected with said capacitance device to charge said capacitance device through said gate means; and a monostable multivibrator circuit connected with said gate means to on-off control the latter, said monostable multivibrator operable to deliver an output signal in response to a decrease in the intensity of a signal wave under reception and in response to an input signal fed to said monostable multivibrator by a manual operation.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |