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101. 发明专利

JPS5928706A Demodulation circuit 失效
标题翻译：解调电路
公开(公告)号：JPS5928706A
公开(公告)日：1984-02-15
申请号：JP13739682
申请日：1982-08-09
申请人： Sansui Electric Co
发明人： IIDA HIROSHI , IWASAKI EIICHIROU
IPC分类号： H03D1/22 , H04H1/00 , H04H40/45 , H04H40/54
CPC分类号： H04H40/54 , H03D1/2236
摘要： PURPOSE:To simplify the constitution of a demodulation circuit without using an analog multiplier or the like, by switching synchronizingly an input amplitude modulation signal by a switching wave not including the 3rd harmonic for demodulating the signal. CONSTITUTION:A composite signal is inputted to a signal input terminal 1 of an FM stereo demodulation circuit and a clock signal produced in synchronizing with a pilot signal is inputted to a clock signal input terminal 2. This clock signal is frequency-divided at 1/3 and 1/2 frequency division circuits 3, 4 to output a couple of outputs Q1, Q1', Q2, Q2' having opposite phase, and the outputs are applied to AND gates 5, 6 and a pulse Q3 where 120 deg. period being 1/3 of one period is at H level and the rest is L level is outputted from the gate 5 and a pulse Q4 of opposite phase difference is outputted from the gate 6. The pulses Q3, Q4 control switches 9, 10 switching the composite signal of a switching circuit 7. Further, the input amplitude modulation wave is demodulated by the switching wave not including the 3rd harmonic and a difference signal L-R is outputted from the circuit 7.
摘要翻译：目的：为了简化解调电路的结构，不使用模拟乘法器等，通过不包括用于解调信号的三次谐波的开关波同步地切换输入幅度调制信号。构成：复合信号被输入到FM立体声解调电路的信号输入端子1，并且与导频信号同步产生的时钟信号被输入到时钟信号输入端子2.该时钟信号被分频为1 / 3和1/2分频电路3,4，以输出具有相反相位的一对输出Q1，Q1'，Q2，Q2'，并将输出施加到与门5,6和120度的脉冲Q3。一个周期的1/3是H电平，其余的L电平从门5输出，反相位差的脉冲Q4从门6输出。脉冲Q3，Q4控制开关9,10的开关转换电路7的复合信号。此外，输入幅度调制波由不包括三次谐波的开关波解调，差分信号LR从电路7输出。

102. 实用新型

JPS5824528Y2 失效
公开(公告)号：JPS5824528Y2
公开(公告)日：1983-05-26
申请号：JP2076277
申请日：1977-02-24
IPC分类号： H04B1/76 , H04H1/00 , H04H40/54 , H04H5/00

103. 实用新型

JPS5840960U 失效
公开(公告)号：JPS5840960U
公开(公告)日：1983-03-17
申请号：JP13664881
申请日：1981-09-14
IPC分类号： H04H1/00 , H04H40/45 , H04H40/54 , H04H5/00

104. 实用新型

JPS5745704Y2 失效
公开(公告)号：JPS5745704Y2
公开(公告)日：1982-10-08
申请号：JP3531773
申请日：1973-03-23
IPC分类号： H03L7/00 , H04H1/00 , H04H40/54

105. 发明专利

JPS5676650A FM STEREO DEMODULATION CIRCUIT 失效
公开(公告)号：JPS5676650A
公开(公告)日：1981-06-24
申请号：JP15292879
申请日：1979-11-28
申请人： HITACHI LTD , HITACHI OME ELECTRONIC CO
发明人： KAWAMOTO MIKIHIKO
IPC分类号： H03D1/22 , H04H1/00 , H04H40/45 , H04H40/54
摘要： PURPOSE:To assure the capture range and to improve the stereo separation degree and high band distortion, by controlling the time constant of loop filter based on the detection signal of stereo pilot signal. CONSTITUTION:A phase comparison circuit 11 phase-detects the FM signal based on 19kHz frequency dividing signal, and the phase difference detection signal is fed to a DC amplifying circuit 13 to output stereo detection signal. In case of monaural broadcast or stereo broadcast reception, until the PLL circuit is locked, the stereo detection signal is a low potential, the relay RL is not operated, and since the switch SW is off, the time constant of the loop filter 3 is small. When the PLL circuit is locked state, the stereo detection signal is at high potential, and since the relay RL is operated and the switch SW is on, the time constant of the loop filter 3 is greater.

106. 发明专利

JPS55159642A STEREO SWITCH CIRCUIT 失效
公开(公告)号：JPS55159642A
公开(公告)日：1980-12-11
申请号：JP6825679
申请日：1979-05-31
申请人： MITSUBISHI ELECTRIC CORP
发明人： UMEYAMA TAKEHIKO
IPC分类号： H04B1/16 , H04H1/00 , H04H40/54
摘要： PURPOSE:To obtain the amplitude control of reproduced subcarrier with good precision, by the series connection of a transistor controlled with the amplitude control signal and a transistor controlled with stereo monaural switching signal and obtaining the output only when both are in conduction. CONSTITUTION:The collector of transistor TRQ1, Q2 to each base of which the reproduced subcarrier signal is fed, is connected to a potential 1 via resistances R50, R51. Next, the emitter of TRQ1, Q2 is connected, the collector of TRQ20 is connected to the connecting point, the collector of TRQ3 is connected to the emitter of TRQ20, and the emitter of TRQ30 is grounded. Further, the amplitude limit signal is fed to the base of TRQ20 and the stereo monaural switching signal 8 is fed to the base of TRQ3, and the reproduced subcarrier output signal in amplitude limit is obtained from the collector of TRQ1,Q2 only when TRQ20,Q3 are both in conduction. Thus, the amplitude control of the reproduced subcarrier can be made with good accuracy.

107. 发明专利

JPS5539137B2 失效
公开(公告)号：JPS5539137B2
公开(公告)日：1980-10-08
申请号：JP3855775
申请日：1975-04-01
IPC分类号： H03D1/22 , H03D3/02 , H03L7/10 , H04H1/00 , H04H40/54 , H04S3/00

108. 实用新型

JPS55138854U 失效
公开(公告)号：JPS55138854U
公开(公告)日：1980-10-03
申请号：JP4318780
申请日：1980-04-02
IPC分类号： H03D3/00 , H03D3/02 , H03L7/00 , H03L7/093 , H04H1/00 , H04H40/54 , H04H5/00

109. 实用新型

JPS558373Y2 失效
公开(公告)号：JPS558373Y2
公开(公告)日：1980-02-25
申请号：JP6370775
申请日：1975-05-15
IPC分类号： H04B1/30 , H03D3/00 , H04H1/00 , H04H40/54 , H04H5/00

110. 发明专利

JPS5437771B2 JPS5437771B2 - 失效
公开(公告)号：JPS5437771B2
公开(公告)日：1979-11-16
申请号：JP2595074
申请日：1974-03-05
IPC分类号： H04H1/00 , H04H40/54

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