1974-11-11
1976-07-06
Griffin, Robert L.
325453, 325455, 325459, 325465, H04B 132
Patent
active
039684440
ABSTRACT:
A digital tuning controller is provided which utilizes the storage of codes relating to the location and bandwidth of unused or illegal frequency bands to control a frequency acquisition operation with minimum circuitry.
A two digit keyboard entry corresponding to a selected channel number is stored. First counter means indicates a current channel location. Second counter means counts regularly spaced frequency markers produced as the band is scanned to increment the first counter. A comparator signals coincidence between the content of the first counter and the keyboard entry. A third counter counts the frequency markers for comparison with the current output state of a read only memory (ROM) having stored codes corresponding to the location and bandwidth of the unused frequency bands. Upon coincidence, the third counter is reset, the second counter is inhibited and the next succeeding location of the ROM is addressed to provide an output state indicating the bandwidth of the skip band. Upon coincidence again occurring between the ROM and the third counter, the second counter is activated to resume counting and the tuning operation continues until either another skip band is reached or the selected channel is acquired.
REFERENCES:
patent: 3654557 (1972-04-01), Sakamoto et al.
patent: 3818353 (1974-06-01), Sakamoto
patent: 3822405 (1974-07-01), Sakamoto
patent: 3839678 (1974-10-01), Bell
patent: 3845394 (1974-10-01), Hamada
Comfort James T.
Dixon James O.
Griffin Robert L.
Levine Harold
Ng Jin F.
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