Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1978-06-05
1979-09-11
Bookbinder, Marc E.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
17910011, 325464, 358191, 360 33, H04B 126
Patent
active
041677048
ABSTRACT:
Channel selecting apparatus for use with first and second electrically tunable tuning devices. A selectively operable channel selector, common to the first and second tuning devices, generates and supplies channel selector signals to the first and second tuning devices to determine the tuning conditon of both devices. A control circuit selectively produces a lock-out control signal; and a locking circuit is coupled to the second tuning device and is responsive to the absence of the lock-out control signal to enable the tuning condition of the second tuning device to be determined by the channel selector signals at the same time that the tuning condition of the first tuning device is determined by the channel selector signals; the locking circuit being responsive to the presence of the lock-out control signal to lock the second tuning device to the tuning condition which was determined by the channel selector signal generated immediately prior to the lock-out control signal, regardless of the subsequent generation of different channel selector signals.
One advantageous applicaton of the channel selecting apparatus is with a common channel selector for use with a television receiver and with a VTR, wherein it is necessary to prevent the broadcast channel to which the VTR is tuned from being changed during a recording operation, even though the television receiver can be tuned to any other different broadcast channel.
REFERENCES:
patent: 3699359 (1972-10-01), Shelby
patent: 4031334 (1977-06-01), Kimura et al.
Saito Takahiko
Sato Masaru
Bookbinder Marc E.
Eslinger Lewis H.
Sinderbrand Alvin
Sony Corporation
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