Title:
AMPLITUDE-MODULATED SIGNAL RECEPTION CIRCUIT
Document Type and Number:
Japanese Patent JP3594921
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve quality of a demodulated signal without changing the radio type of an amplitude-modulated (AM) transmitted wave.
SOLUTION: A received AM signal is frequency converted, and an obtained intermediate frequency (IF) signal is divided into two signals. One is converted into an IF signal having a fixed amplitude by a limiter 107. The other is frequency converted by a frequency converter 108 and an IF signal is taken out there from by an IF filter 110. This IF signal and the above-mentioned IF signal having the fixed amplitude are multiplied by a frequency converter 111, converted into a single-sideband signal, and demodulated by an RZ SSB (Real Zero Single Sideband) demodulation circuit 113 after removing noise by an IF filter 112.
Inventors:
Yasuhiro Ito
Yasuaki Nishida
Takashi Ando
Kazuhiro Oguro
Shinichi Hosoya
Yasuaki Nishida
Takashi Ando
Kazuhiro Oguro
Shinichi Hosoya
Application Number:
JP2001326581A
Publication Date:
December 02, 2004
Filing Date:
October 24, 2001
Export Citation:
Assignee:
Japan Broadcasting Corporation
NCA Engineering Service
Rcom Co., Ltd.
Japan Castem Co., Ltd.
NCA Engineering Service
Rcom Co., Ltd.
Japan Castem Co., Ltd.
International Classes:
H04B1/26; H03D1/24; H04B1/16; H04B7/12; (IPC1-7): H04B1/26; H03D1/24; H04B7/12
Domestic Patent References:
| JP11145730A | ||||
| JP6252649A | ||||
| JP56014704A | ||||
| JP2003134069A |
Attorney, Agent or Firm:
Naotaka Ide
Toshinao Shimodaira
Toshinao Shimodaira
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