Telecommunications – Transmitter – Having harmonic radiation suppression
Patent
1996-11-04
1998-05-26
Eisenzopf, Reinhard J.
Telecommunications
Transmitter
Having harmonic radiation suppression
455 91, 375296, H04B 104
Patent
active
057582688
ABSTRACT:
In a microphone, unnecessary radiation can be easily reduced with a simple construction. This invention provides a power supply output generating means for generating a power supply output of predetermined voltage on the basis of an output of a power supply unit; a tone signal generating means for operating according to the output of the power supply unit and generating a tone signal; a sound electric signal converting means for converting a sound into an electric signal; a mixing means for mixing the sound signal obtained by the sound electric signal converting means and the tone signal; a modulating means for modulating a carrier wave with a low frequency signal consisting of the sound signal and tone signal which are mixed by the mixing means; and a transmitting means for transmitting modulated wave signal modulated by the modulating means in an electric wave, and wherein the tone signal generating means generates the tone signal having predetermined frequency and predetermined frequency deviation such as not to extend across predetermined frequency bandwidth of the carrier wave, and the voltage generating means generates the power supply output of predetermined voltage on the basis of the output of the power supply unit by using the tone signal as a clock.
REFERENCES:
patent: 4370622 (1983-01-01), Hornbeck et al.
patent: 4811422 (1989-03-01), Kahn
patent: 5077831 (1991-12-01), Weber
Murakami Yoshihiro
Tomiyama Yasuaki
Eisenzopf Reinhard J.
Frommer William S.
Le Thanh
Sony Corporation
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