H - Electricity – 03 – J
Patent
H - Electricity
03
J
365/10
H03J 7/20 (2006.01) H03J 1/00 (2006.01)
Patent
CA 1126886
S01211 TUNING INDICATOR APPARATUS FOR A FREQUENCY SYNTHESIZER TUNER ABSTRACT OF THE DISCLOSURE 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 com- parator 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 res- ponsive 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. -i-
333864
Harada Hideo
Nishimura Yoshinori
Umeda Kaoru
Gowling Lafleur Henderson Llp
Sony Corporation
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