Title:
FM TRANSMITTER
Document Type and Number:
Japanese Patent JP3957314
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the number of components such as an expensive crystal resonator, and also to reduce a cost and a mounting area in an FM transmitter.
SOLUTION: The FM transmitter is provided with: an oscillation circuit of an FM broadcast wave; a stereo modulation circuit for performing stereo modulation for sound signals of two systems on right and left, and outputting a signal for controlling oscillation of the oscillation circuit; and a PLL frequency synthesizer consisting of a program counter for variably dividing the output frequency of the oscillation circuit, of a reference frequency dividing circuit for dividing a reference frequency of 7.6 MHz (or a part for integral multiple of this frequency or integer), and of a phase comparing circuit for comparing an output of the program counter with an output of the reference frequency dividing circuit and outputting a signal for controlling oscillation of the oscillation circuit. The stereo modulation circuit uses a clock to be generated from an output of the reference frequency dividing circuit to make stereo modulation.
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Inventors:
Tamotsu Suzuki
Hiroyuki Soda
Masatoshi Tsuji
Hiroyuki Soda
Masatoshi Tsuji
Application Number:
JP2005351229A
Publication Date:
August 15, 2007
Filing Date:
December 05, 2005
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
H04B1/04; H04H20/48; H04H1/00
Domestic Patent References:
| JP2000228635A | ||||
| JP9321720A |
Attorney, Agent or Firm:
Tsuneo Fujikawa
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