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121. 发明专利

JPS5831133B2 失效
公开(公告)号：JPS5831133B2
公开(公告)日：1983-07-04
申请号：JP8767377
申请日：1977-07-20
申请人： MITSUBISHI ELECTRIC CORP
发明人： SASADA MASAAKI
IPC分类号： H03C1/50 , H03C3/00 , H03C3/06 , H04H1/00 , H04H40/36 , H04S1/00

122. 实用新型

JPS5893075U 失效
公开(公告)号：JPS5893075U
公开(公告)日：1983-06-23
申请号：JP18778781
申请日：1981-12-16
IPC分类号： H04N5/60 , H04H1/00 , H04H40/36 , H04N7/06 , H04N7/08 , H04N7/081 , H04H5/00

123. 发明专利

JPS5890875A SOUND MULTIPLEX RECEIVER 失效
公开(公告)号：JPS5890875A
公开(公告)日：1983-05-30
申请号：JP18973781
申请日：1981-11-25
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： YAMADA TADASHI , UTSU YOSHITOMO
IPC分类号： H04H20/00 , H04H40/36 , H04H60/80 , H04N5/60
摘要： PURPOSE:To listen to desired sound without hindrance, by transmitting a sub- sound signal when a sound signal is biased to a main sound signal and transmitting the main sound signal when biased to the sub-sound signal through FM modulation at the reception of duplex sound signal. CONSTITUTION:In receiving duplex sound signals, a mode switching circuit 1 is changed over into ''main sound + sub-sound signal'' mode to obtain main and sub-sound signals from a multiplex demodulator 2 and outputted respectively from speakers 6 and 7. Further, the main and sub-sound signals are led to an FM modulator 8 via a switch circuit 9. The sound volume of the main and sub- sound signals is compared at a sound volume/sound quality balance control circuit 3, the result is given to a duplex sound signal switching circuit 10, and when the main sound signal is larger than the sub-sound signal, the sub-sound signal is transmitted to an FM modulator 8 and when the sub-sound signal is larger, the main sound signal is transmitted. Thus, the desired sound signals can be listened to without being interfered with the other sound signal.

124. 发明专利

JPS5846738A AMPLITUDE LIMITER 失效
公开(公告)号：JPS5846738A
公开(公告)日：1983-03-18
申请号：JP14361681
申请日：1981-09-11
申请人： SONY CORP
发明人： YOKOYA SATOSHI
IPC分类号： H03C1/02 , H03G3/20 , H04B1/04 , H04H1/00 , H04H40/36
摘要： PURPOSE:To limit the occupied band width with virtually no deterioration of the stereophonic normal and sound quality, by limiting the modulation factor of the signals having the frequencies higher than a prescribed level within a allowable occupied band width down to a level lower than the prescribed value and to prevent the undesired out-of-band radiation caused by a higher order spectrum. CONSTITUTION:The value of a reference power supply 31 is set previously at the level corresponding to 50% modulation factor of the L-R signal. As a result, an operational amplifier 30 controls variable gain amplifiers 21 and 24 with its output when the output of rectification exceeds the reference level. Thus the gain is reduced for these amplifiers. The occupied band width is referred to as BW, and the outputs (

125. 发明专利

JPS587943A AM STEREO SYSTEM 失效
公开(公告)号：JPS587943A
公开(公告)日：1983-01-17
申请号：JP10612681
申请日：1981-07-07
申请人： SONY CORP
发明人： YOKOYA SATOSHI
IPC分类号： H04H1/00 , H04H40/36 , H04H5/00
摘要： PURPOSE:To remove distortion from the envelop components of transmitted output waves and attain the complete compatibility of the titled system with a monaural receiver by detecting the envelope of the transmitted output wave and negatively feeding back the detected wave to a total (L+R) signal of the AM stereo system. CONSTITUTION:A left signal L and a right signal R are inputted to a matrix circuit 3 and a total signal L+R and a difference signal L-R are outputted from the circuit 3 and inputted respective phase shifting networks 4, 5. A total signal X- obtained by phase-shifting by -45 deg. in the network 4 modulates a differential signal Y+ phase-shifted by +45 deg. in the network 5 in a submodulator 12 and the modulated output is supplied to a multiplier 7 to modulate -sinomegact. Together with a carrier component 1 applied from a power source 15, the signal X- is inputted to an operational amplifier 11. The envelope of transmitted output waves is detected 17 and negatively fed back to the amplifier 11. The output of the amplifier 11 is supplied to a multiplier 6 to modulate cosomegact. The outputs of the multipliers 6, 7 are added by an adder 8 and sent as a transmission wave (F)t represented by formula A. In the formula A, mt is a factorindicating the depth of submodulation and is set to 0.5-1.0 and omegac is an angle carrier.

126. 发明专利

JPS57173241A SOUND MULTIPLEX BROADCAST RECEIVER 失效
公开(公告)号：JPS57173241A
公开(公告)日：1982-10-25
申请号：JP5949981
申请日：1981-04-17
申请人： SHARP KK
发明人： TAKEDA AKINOBU , KATOU TOMIO
IPC分类号： H04H1/00 , H04H40/36 , H04N5/60
摘要： PURPOSE:to prevent a phase shift during demodulation by separating and demodulating a stereophonic signal transmitted over the 1st channel for (L+R)/2 signal transmission and the 2nd channel for R signal transmission only by addition and subtraction. CONSTITUTION:A signal (L+R)/2 supplied to an input terminal 12 is supplied to the input terminal (+) of the 2nd subtracter 9 and also supplied to the input terminal (-) of the 1st subtracter 8 and one input terminal of an adder 10 through a mode changeover switch 11. Therefore, the 1st subtracter 8 finds a difference between a signal R and the signal (L+R)/2 to generate a signal (R-L)/2. This signal is supplied to the other input terminal of the adder 10 and also inputted to the input terminal (-) of the 2nd subtracter 9 through the mode changeover switch 11, so a stereophonic signal L appears at a terminal 14 and a stereophonic signal R appears at the output terminal 15 of the adder 10. For the reception of a bilingual broadcast, the mode switch is placed in an open state reverse of the state in the figure.

127. 实用新型

JPS57148971U 失效
公开(公告)号：JPS57148971U
公开(公告)日：1982-09-18
申请号：JP3619881
申请日：1981-03-13
IPC分类号： H04N5/60 , H04B1/16 , H04H1/00 , H04H40/36 , H04N5/445 , H04H5/00

128. 实用新型

JPS57143749U 失效
公开(公告)号：JPS57143749U
公开(公告)日：1982-09-09
申请号：JP3053081
申请日：1981-03-05
IPC分类号： H04B1/18 , H04H1/00 , H04H40/36 , H04H5/00

129. 实用新型

JPS57128277U 失效
公开(公告)号：JPS57128277U
公开(公告)日：1982-08-10
申请号：JP1525781
申请日：1981-02-05
IPC分类号： H04N5/60 , H04H1/00 , H04H40/36 , H04H5/00

130. 发明专利

JPS57113644A REJECTION SYSTEM OF STEREO DISCRIMINATING SIGNAL IN AM STEREO RECEIVER 失效
公开(公告)号：JPS57113644A
公开(公告)日：1982-07-15
申请号：JP18805780
申请日：1980-12-31
申请人： VICTOR COMPANY OF JAPAN
发明人： SANO SHIYOUJI
IPC分类号： H04H1/00 , H04H40/36 , H04H5/00
摘要： PURPOSE:To eliminate stereo discrimination signals mixed in a demodulation output without losing wide band characteristics, by inputting the demodulated output of an AM stereo receiver to an operation circuit, and synthesizing the output of the circuit with the output passing through an LPF. CONSTITUTION:The output side of an AM detector 14 and a phase detector 16 of an AM stereo receiver is provided with a stereo discriminating signal rejecting circuit 28, and outputs L, R of the detector 14 are inputted to resepctive operation circuits 36, 38 of the circuit 28 via a matrix circuit 26. An output (L-R)+ID of the phase detector 16 is inputted to a 5Hz low-pass filter 30 and the outputted ID signal is inputted to a level adjuster 32 and a phase variable circuit 34, to adjust the amplitude and phase of the ID signal. The ID signal adjusted for the amplitude and phase is inputted to the circuits 36, 38 and demodulated outputs L0, R0 rejecting the ID signal are outputted to the outputs of the circuits 36, 38 without losing wide band characteristics.

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