H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/117, 325/18
H04B 1/26 (2006.01) H03J 7/28 (2006.01)
Patent
CA 1089017
ABSTRACT OF THE DISCLOSURE A superheterodyne receiver comprises a high frequency amplifier, a local oscillator implemented by a frequency syn- thesizer including a phase locked loop, a mixer, an intermediate frequency amplifier, and an up down counter for providing data concerning the frequency division ratio of a programmable coun- ter in the phase locked loop. The up down counter is responsive to a command signal from an upward scanning switch to make an upward counting operation and is responsive to a command signal from a downward scanning switch to make a downward counting operation, and is further responsive to command signals simul- taneously obtained from these switches to make a consecutive upward and downward countering operation, whereby a receiving channels are consecutively selected in the upward or downward direction in a fast scanning manner. Preferably, a fast scann- ing operation responsive to simultaneous depression of the switches is stopped responsive to a receiving signal such as an intermediate frequency signal or a detected signal obtained when a broadcasting channel is selected. A digital channel display is provided such that the data representative of the channel being selected obtainable from a control is transferred in a bit serial signal format to the display; pulses having a pulse width wider than a predetermined value are utilized for the pur- pose of data processing to eliminate adverse effects of noise.
292647
Ozawa Toshiyuki
Yamashita Norio
G. Ronald Bell & Associates
Sanyo Electric Co. Ltd.
Tokyo Sanyo Electric Co. Ltd.
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