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1. 发明专利

JP2007228566A Method and apparatus for minimizing harmonic interference in radio receiver 审中-公开
标题翻译：用于最小化无线电接收机谐波干扰的方法和装置
公开(公告)号：JP2007228566A
公开(公告)日：2007-09-06
申请号：JP2007012324
申请日：2007-01-23
申请人： Mitsubishi Electric Research Laboratories Inc , ミツビシ・エレクトリック・リサーチ・ラボラトリーズ・インコーポレイテッド
发明人： YERAZUNIS WILLIAM S , LEIGH DARREN L , DIETZ PAUL H
IPC分类号： H04B1/10 , H03D3/04
CPC分类号： H04B15/06
摘要： PROBLEM TO BE SOLVED: To solve the problem that, in the case of a demodulation method, any interference passing through an analog filter stage is demodulated and is present as interference in an output signal, and in the case of a detector, all interferences appear as a part of a baseband signal in an output of the detector, thereby minimizing harmonic interference which appears in the case of a synchronous detector or a quadrature demodulator.
SOLUTION: A method and apparatus for minimizing harmonic interference in a radio receiver are presented. A received radio signal is periodically switched to an integrator as a positive signal, and periodically switched to the integrator as a negative signal. The integrator is periodically switched to ground to block the received signal from the integrator to minimize the harmonic interference.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题为了解决在解调方法的情况下，通过模拟滤波级的任何干扰被解调并作为输出信号中的干扰存在的问题，并且在检测器的情况下，所有干扰在检测器的输出中表现为基带信号的一部分，从而最小化在同步检波器或正交解调器的情况下出现的谐波干扰。提出了一种用于最小化无线电接收机中的谐波干扰的方法和装置。接收到的无线电信号被周期地切换到积分器作为正信号，并且周期性地切换到积分器作为负信号。积分器周期性地切换到地，以阻止来自积分器的接收信号，以最小化谐波干扰。版权所有（C）2007，JPO＆INPIT

2. 发明专利

JP3820295B2 失效
公开(公告)号：JP3820295B2
公开(公告)日：2006-09-13
申请号：JP34785696
申请日：1996-12-26
IPC分类号： H03D3/00 , H03D3/04
摘要： A frequency modulation (FM) signal demodulating circuit having a simple structure using general digital devices is provided. The FM signal demodulating circuit according to the present invention includes a first pulse generator for generating a pulse signal having a predetermined pulse width at every rising edge of the input FM signal, a second pulse generator for generating a pulse signal having a predetermined pulse width at every falling edge of the input FM signal, a combining portion for combining the pulse signals generated in the first pulse generator and the second pulse generator, and a low-pass filter for performing a low-pass filtering operation by receiving a combined pulse signal generated in the combining portion and outputting a signal having a magnitude corresponding to the frequency of the input FM signal. The FM signal demodulating circuit according to the present invention has a simple structure.

3. 发明专利

JP3485088B2 失效
公开(公告)号：JP3485088B2
公开(公告)日：2004-01-13
申请号：JP2000381245
申请日：2000-12-15
IPC分类号： G06F1/06 , G11B20/14 , H03D3/00 , H03D3/04 , H04L25/34

4. 发明专利

JPH031856B2 失效
公开(公告)号：JPH031856B2
公开(公告)日：1991-01-11
申请号：JP12985581
申请日：1981-08-18
申请人： PIONEER ELECTRONIC CORP
发明人： ISHIDA KOJI , NUMATA TATSUO , NOGUCHI TADASHI
IPC分类号： H03D1/22 , H03D3/04 , H04H1/00 , H04H40/45 , H04H40/72

5. 发明专利

JPH0216608B2 失效
公开(公告)号：JPH0216608B2
公开(公告)日：1990-04-17
申请号：JP5479384
申请日：1984-03-21
申请人： ROHM KK
发明人： IZAWA KAORU
IPC分类号： H03D3/00 , H03D3/04

6. 发明专利

JPH0281366A FM WAVE DEMODULATING CIRCUIT 失效
公开(公告)号：JPH0281366A
公开(公告)日：1990-03-22
申请号：JP23391288
申请日：1988-09-19
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： HONJO MASAHIRO
IPC分类号： G11B20/06 , H03D3/00 , H03D3/04 , H04N5/92 , H04N5/931
摘要： PURPOSE:To prevent an FM inverting phenomenon without changing the zero cross point of a normal FM signal by inputting the frequency modulated wave and the output from a pulse generating circuit to two differential inputs of a differential input type limiter circuit and executing the FM modulation after a limiter is executed. CONSTITUTION:The title circuit is composed of a peak detecting circuit to detect the peak point of an frequency modulated wave, a pulse generating circuit 3 to have a mirror width by the information from a peak detecting circuit and generate the pulse of the polarity reverse to the frequency modulated wave and a demodulating circuit 5 having a differential input type limiter circuit 4. The frequency modulated wave and the output from the pulse generating circuit 3 are inputted to two differential inputs of the differential input type limiter circuit 4 and after the limiter is executed, the frequency demodulated is executed. Thus, over all frequency ranges where the FM fundamental wave exists, the inverting phenomenon can be prevented.

7. 发明专利

JPH0122765B2 失效
公开(公告)号：JPH0122765B2
公开(公告)日：1989-04-27
申请号：JP6695483
申请日：1983-04-18
申请人： HITACHI LTD
发明人： MIURA KUNIAKI , KOBORI YASUNORI , FUKUSHIMA ISAO , SHIOMI MAKOTO , KANO KENJI
IPC分类号： H04N5/922 , G11B20/06 , H03D3/00 , H03D3/04

8. 发明专利

JPS6329442B2 失效
公开(公告)号：JPS6329442B2
公开(公告)日：1988-06-14
申请号：JP7146479
申请日：1979-06-06
申请人： ONKYO KK
发明人： HANDA JINKO
IPC分类号： H03D3/00 , H03D3/04

9. 发明专利

JPS6236401B2 失效
公开(公告)号：JPS6236401B2
公开(公告)日：1987-08-06
申请号：JP9094080
申请日：1980-07-03
申请人： TOKYO SHIBAURA ELECTRIC CO
发明人： OKUI ISAMU , YOSHIHISA KOZO
IPC分类号： H03D1/18 , H03D3/00 , H03D3/02 , H03D3/04

10. 发明专利

JPS60218909A DEMODULATING CIRCUIT 失效
公开(公告)号：JPS60218909A
公开(公告)日：1985-11-01
申请号：JP7447884
申请日：1984-04-13
申请人： NIPPON ELECTRIC CO
发明人： INOUE TAKETOSHI
IPC分类号： H03K9/06 , H03D3/00 , H03D3/04
摘要： PURPOSE:To improve S/N in a simple and effective way by using plural Schmitt trigger circuits and monostable multivibrators and synthesizing the demodulated signals at a time. CONSTITUTION:The modulated signal applied to an input terminal 26 is converted into a pulse signal by a Schmitt trigger circuit group 27 and then into a PPM signal by a monostable multivibrator group 28. The MM1, MM2... of the group 28 have the same working, and the demodulated signals are extracted after the high frequency components are eliminated by LPF1, LPF2... of an LPF group 29. These demodulated signals are applied to an adder 30. The noise components are produced by the Schmitt trigger circuits and monostable multivibrators respectively and therefore not correlative with each other. Therefore, the synthetic noise volume of the adder 30 is set at P1/2N. Thus the S/N of the output of the adder 30 is increased in proportion to the square root of the number P of the monostable multivibrator groups.

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