Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1979-08-14
1981-10-13
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455183, 455170, 334 86, H04B 116
Patent
active
042952247
ABSTRACT:
Tuning indicator apparatus is provided for use with a frequency synthesizer tuner of the type having a phase-locked loop including a reference oscillator, a variable frequency oscillator to produce a local oscillating signal, a programmable frequency divider coupled to the variable frequency oscillator for dividing the frequency of the local oscillating signal by a variable dividing ratio to produce a frequency-divided oscillating signal, a phase comparator for comparing the frequency-divided oscillating signal to the output of the reference oscillator to produce an error signal, and a feedback circuit for feeding back the error signal from the phase comparator to the variable frequency oscillator to adjust the frequency of the local oscillating signal and thereby establish a tuning condition of the tuner. The tuning indicator apparatus includes a counter for counting counter pulses supplied thereto, the count of this counter determining the dividing ratio of the programmable frequency divider. An indicating circuit is responsive to a change in at least a predetermined value of the count of this counter to indicate that the count has changed and, thus, that the tuning condition of the tuner has changed. In a preferred embodiment, a sound generator is provided to generate an audible indication of a change in the tuning condition.
REFERENCES:
patent: 3676781 (1972-07-01), Worcester
patent: 3803494 (1974-04-01), Howell et al.
patent: 3949304 (1976-04-01), McClaskey
patent: 4008436 (1977-02-01), Fujita
patent: 4048570 (1977-09-01), Sumi
patent: 4114103 (1978-09-01), Pelasterer
patent: 4117407 (1978-09-01), Kusakabe
patent: 4161708 (1979-07-01), Friberg
Harada Hideo
Nishimura Yoshinori
Umeda Kaoru
Bookbinder Marc E.
Chin Tommy P.
Eslinger Lewis H.
Sinderbrand Alvin
Sony Corporation
LandOfFree
Tuning indicator apparatus for a frequency synthesizer tuner does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tuning indicator apparatus for a frequency synthesizer tuner, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tuning indicator apparatus for a frequency synthesizer tuner will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-934794