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US3940702A Expired / Lapsed US ⏱️ 0.0 years remaining

Automatically presetting channel selecting system

Assignee: Alps Alpine Co Ltd
•
Filing: 1974-10-07
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Granted: 1976-02-24
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Expires: 1994-10-07
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Abstract

Abstract A channel selecting system for use in a receiver having a voltage controlled tuning element which has an automatic channel presetting function which utilizes a pulse generator and a binary counter connected to the generator to count the pulses and to generate a binary coded output in accordance with the sum of the pulses. A digital-to-analog converter changes the binary coded output into a linearly increasing tuning sweep voltage which in turn conditions the voltage controlled tuning element to scan the frequency range of the tuner as the tuning voltage increases. As the frequencies are scanned, a detector, connected to the tuning element, senses the presence of a broadcast channel. When a channel is detected, the scan is interrupted and a binary memory is utilized to store the binary coded output which corresponds to the frequency of the detected broadcast channel. A control gate signal generator driven by the detector controls the pulse generator and memory such that the scan is continued until the entire frequency range has been scanned. Channel selection is accomplished by switch means actuatable to address the memory to read out a selected binary code output corresponding to the channel desired which causes the converter to generate a voltage to condition the tuning element to tune to the desired frequency. The voltage control tuning element may comprise several different elements, one for each of a plurality of different frequency ranges. Means are provided for selecting an appropriate tuner such that channels from any of the frequency ranges may be selected.

Inventors

  • 👤 Jun'Ichi Yoshimura
  • 👤 Tatsumi Watabe

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 14:01
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/18; H03J7/20; H03J7/28; H03J5/00; H03J5/02; H03J5/0245; H03J5/0254; H03J5/0263

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 215 words
A channel selecting system for use in a receiver or the like having a first voltage controlled tuning element capable of tuning in a first frequency range and a second voltage control tuning element capable of tuning in a second frequency range, said system comprising means for detecting the presence of a broadcast signal at a selected frequency, means for generating a first data signal corresponding to the voltage level necessary to condition one of said elements to tune said frequency, storage means, control means operably connected to said detecting means and said storage means for actuating said storage means to store said first data signal, means for generating a voltage in accordance with said first data signal, a selected one of said tuning elements being conditionable by said voltage to select a frequency in accordance therewith, a read-only memory having stored therein second data signals corresponding to voltages capable of conditioning each of said first and second tuning elements to the upper and lower limits of their respective frequency ranges, means for comparing said first data signals with said second data signals and for generating an equality signal in the event said signals are equal and means for selecting one of said first and said second tuning elements in accordance with said equality signal.
Claim 2
Dependent Claim 215 words
A channel selecting system for use in a receiver or the like having a first voltage controlled tuning element capable of tuning in a first frequency range and a second voltage control tuning element capable of tuning in a second frequency range, said system comprising means for detecting the presence of a broadcast signal at a selected frequency, means for generating a first data signal corresponding to the voltage level necessary to condition one of said elements to tune said frequency, storage means, control means operably connected to said detecting means and said storage means for actuating said storage means to store said first data signal, means for generating a voltage in accordance with said first data signal, a selected one of said tuning elements being conditionable by said voltage to select a frequency in accordance therewith, a read-only memory having stored therein second data signals corresponding to voltages capable of conditioning each of said first and second tuning elements to the upper and lower limits of their respective frequency ranges, means for comparing said first data signals with said second data signals and for generating an equality signal in the event said signals are equal and means for selecting one of said first and said second tuning elements in accordance with said equality signal.
Claim 3
Dependent Claim 107 words
The system of claim 1 wherein said voltage generating means comprises a digital to analog converter, a pulse generator and a counter, said converter being operably connected to said counter to generate a voltage which is a function of the entry on said counter, said pulse generator being operatively connected to said counter to index same to produce said first data signals, said read-only memory having second data signals stored therein corresponding to the entries in said counter which will cause said converter to generate voltages capable of conditioning each of said first and second tuning elements to the upper and lower limits of their respective ranges.
Claim 4
Dependent Claim 54 words
The system of claim 2 comprising a second counter operatively connected to said comparing means and said pulse generator for deactuating said pulse generator when the entry in said second counter equals the second data signal in said read-only memory corresponding to the upper limit of the range of one of said tuning elements.
Claim 5
Dependent Claim 21 words
The system of claim 1 further comprising means for detecting the presence of an empty address location in said storage means.

References Cited (Backward Citations)

US3651411A Cited
US3845394A Cited
US3821651A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-02-23 1979-08-25 1980-02-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-02-23 1983-08-25 1984-02-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-02-23 1987-08-25 1988-02-24 $7700.00 Window Closed / Lapsed

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