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1. 发明授权

US4523329A FM receiver 失效
标题翻译： FM接收机
公开(公告)号：US4523329A
公开(公告)日：1985-06-11
申请号：US529781
申请日：1983-09-06
申请人： Kohji Ishida , Tatsuo Numata , Masaharu Sakamoto
发明人： Kohji Ishida , Tatsuo Numata , Masaharu Sakamoto
IPC分类号： H03D1/22 , H03D3/06 , H04B1/16 , H04H1/00 , H04H40/45 , H04H5/00
CPC分类号： H03D1/2236
摘要： An FM receiver comprising a 90 degree phase shifter 21 of the FM signal and a first multiplier 22 for multiplying the FM signal and the phase shifted signal to produce a main signal L+R and a second multiplier 6 for multiplying the FM signal, the phase shifted signal and a subcarrier wave of 38 kHz to produce a sub-signal L-R.
摘要翻译： FM接收机包括FM信号的90度移相器21和用于将FM信号和相移信号相乘以产生主信号L + R的第一乘法器22和用于乘以FM信号的第二乘法器6，该相位移位信号和38kHz的副载波产生子信号LR。

2. 发明授权

US4510452A Circuit having square-law transfer characteristic 失效
标题翻译：电路具有平方律转移特性
公开(公告)号：US4510452A
公开(公告)日：1985-04-09
申请号：US389770
申请日：1982-06-18
申请人： Kohji Ishida , Masaharu Sakamoto
发明人： Kohji Ishida , Masaharu Sakamoto
IPC分类号： G06G7/20 , H03D7/12 , G06G7/12
CPC分类号： H03D7/12
摘要： Disclosed is a frequency converter circuitry having square-law transfer characteristics.In order to reduce undesirable harmonic components of the output signal, the circuitry comprises a plurality of active elements, each being responsive to respective harmonic components and having a characteristic adjusting means, connected in parallel with each other so as to provide an overall input/output transfer function approximating a square-law transfer characteristic.
摘要翻译：公开了具有平方律转移特性的变频器电路。为了减少输出信号的不期望的谐波分量，电路包括多个有源元件，每个有源元件响应于相应的谐波分量并且具有彼此并联连接的特征调整装置，以便提供总体输入/输出传递函数近似平方律传递特性。

3. 发明授权

US4539697A FM Stereo demodulating circuit 失效
标题翻译： FM立体声解调电路
公开(公告)号：US4539697A
公开(公告)日：1985-09-03
申请号：US529773
申请日：1983-09-06
申请人： Kohji Ishida , Tatsuo Numata , Masaharu Sakamoto
发明人： Kohji Ishida , Tatsuo Numata , Masaharu Sakamoto
IPC分类号： H03D1/22 , H04B1/16 , H04H1/00 , H04H40/45 , H04H40/54 , H04H5/00
CPC分类号： H04H40/54 , H03D1/2236 , H04B1/1646
摘要： An FM stereo demodulating circuit comprising a pulse counter detector 1 for generating a pulse train signal including the frequency spectrum of the FM signal, DC biasing means for current biasing the detector output about a midpoint, a subcarrier signal generator 2 and current drivers 8, 10 for generating dual polarity biased subcarrier currents, first and second transistor pairs 3, 4, the emitters of each being connected to one of the current drivers, and the bases of the pairs being cross-connected to one of the biased detector outputs, at least one reference transistor pair whose emitters are connected to a current source 11 and whose collectors are connected to each of the biased detector outputs. The currents entering the cross-connected collectors of the first and second transistor pairs, when referenced against the currents into the emitters of the reference transistor pair, produce signals proportional to the right and left channels of the FM signal.
摘要翻译：一种FM立体声解调电路，包括用于产生包括FM信号的频谱的脉冲串信号的脉冲计数器检测器1，用于电流偏置关于中点的检测器输出的DC偏置装置，副载波信号发生器2和电流驱动器8,10 为了产生双极性偏置子载波电流，第一和第二晶体管对3,4，每个的发射极连接到电流驱动器中的一个，并且对的基极至少与偏置的检测器输出之一交叉连接一个参考晶体管对，其发射极连接到电流源11，并且其集电极连接到每个偏置的检测器输出。当参考相对于参考晶体管对的发射极的电流时，进入第一和第二晶体管对的交叉集电极的电流产生与FM信号的右通道和左通道成比例的信号。

4. 发明授权

US5067157A Noise reduction apparatus in an FM stereo tuner 失效
标题翻译： FM立体声调谐器中的降噪装置
公开(公告)号：US5067157A
公开(公告)日：1991-11-19
申请号：US442770
申请日：1989-11-29
申请人： Kohji Ishida , Yasushi Nishimura , Shigeru Yamaguchi
发明人： Kohji Ishida , Yasushi Nishimura , Shigeru Yamaguchi
IPC分类号： H04B1/16
CPC分类号： H04B1/1676
摘要： A noise reduction apparatus in an FM stereo tuner including a circuit for generating a stereo sum signal and a stereo differential signal; a noise eliminating circuit for dividing, in accordance with several frequency bands, the stereo differential signal into several divisional signals and for outputting, in accordance with signals levels corresponding to the frequency bands, a composite signal of divisional stereo differential signals respectively corresponding to the signal levels; and a circuit for reproducing a stereo signal from the composite signal and the stereo sum signal. In another embodiment, the noise reduction apparatus includes a circuit for generating a stereo sum signal and a first stereo differential signal; a noise eliminating circuit for dividing the stereo sum signal and the first stereo differential signal into several division differential signals and several divisional sum signals, for eliminating a low-level divisional stereo differential signal in each of the frequency bands to generate a second stereo differential signal, and for outputting a composite signal representing the second stereo differential signal and those divisional stereo sum signals in the same divisional band as the eliminated divisional stereo differential signals; and a circuit for reproducing a stereo signal from the composite signal and the stereo sum signal.
摘要翻译：一种FM立体声调谐器中的降噪装置，包括用于产生立体声和信号和立体声差分信号的电路; 噪声消除电路，用于根据多个频带将立体声差分信号划分为几个分数信号，并根据与频带对应的信号电平，分别对应于信号的分立体声差分信号的复合信号水平; 以及用于从复合信号和立体声和信号再现立体声信号的电路。在另一实施例中，降噪装置包括用于产生立体声和信号和第一立体声差分信号的电路; 噪声消除电路，用于将立体声和信号和第一立体声差分信号分成几个分频差分信号和几个除数和信号，用于消除每个频带中的低级分立体声差分信号，以产生第二立体声差分信号并且用于输出表示第二立体声差分信号的复合信号和与所消除的分立体声差分信号相同的分频带中的那些分立体声和信号; 以及用于从复合信号和立体声和信号再现立体声信号的电路。

5. 发明授权

US5253299A Noise reduction apparatus in an FM stereo tuner 失效
标题翻译： FM立体声调谐器中的降噪装置
公开(公告)号：US5253299A
公开(公告)日：1993-10-12
申请号：US915868
申请日：1992-07-20
申请人： Kohji Ishida , Yasushi Nishimura , Shigeru Yamaguchi
发明人： Kohji Ishida , Yasushi Nishimura , Shigeru Yamaguchi
IPC分类号： H04B1/16 , H04H5/00
CPC分类号： H04B1/1676
摘要： A noise reduction apparatus in an FM stereo tuner including a circuit for generating a stereo sum signal and a stereo differential signal; a noise eliminating circuit for dividing, in accordance with several frequency bands, the stereo differential signal into several divisional signals and for outputting, in accordance with signals levels corresponding to the frequency bands, a composite signal of divisional stereo differential signals respectively corresponding to the signal levels; and a circuit for reproducing a stereo signal from the composite signal and the stereo sum signal. In another embodiment, the noise reduction apparatus includes a circuit for generating a stereo sum signal and a first stereo differential signal; a noise eliminating circuit for dividing the stereo sum signal and the first stereo differential signal into several divisional differential signals and several divisional sum signals, for eliminating a low-level divisional stereo differential signal in each of the frequency bands to generate a second stereo differential signal, and for outputting a composite signal representing the second stereo differential signal and those divisional stereo sum signals in the same divisional band as the eliminated divisional stereo differential signals; and a circuit for reproducing a stereo signal from the composite signal and the stereo sum signal.
摘要翻译：一种FM立体声调谐器中的降噪装置，包括用于产生立体声和信号和立体声差分信号的电路; 噪声消除电路，用于根据多个频带将立体声差分信号划分为几个分数信号，并根据与频带对应的信号电平，分别对应于信号的分立体声差分信号的复合信号水平; 以及用于从复合信号和立体声和信号再现立体声信号的电路。在另一实施例中，降噪装置包括用于产生立体声和信号和第一立体声差分信号的电路; 噪声消除电路，用于将立体声和信号和第一立体声差分信号分成若干分微分信号和几个除数和信号，用于消除每个频带中的低级分立体声差分信号以产生第二立体声差分信号并且用于输出表示第二立体声差分信号的复合信号和与所消除的分立体声差分信号相同的分频带中的那些分立体声和信号; 以及用于从复合信号和立体声和信号再现立体声信号的电路。

6. 发明授权

US4399324A Multiplex demodulation circuit 失效
标题翻译：多路解调电路
公开(公告)号：US4399324A
公开(公告)日：1983-08-16
申请号：US183783
申请日：1980-09-03
申请人： Kohji Ishida , Tatsuo Numata
发明人： Kohji Ishida , Tatsuo Numata
IPC分类号： H03D1/22 , H04H1/00 , H04H40/45 , H04H40/63 , H04H5/00
CPC分类号： H04H40/63 , H03D1/2209
摘要： A multiplex demodulation circuit in which no band elimination filter is required for eliminating beating between the mixed signals and odd harmonics of the 38 KHz switching signal derived from the 19 KHz pilot signal. The FM detection signal is logarithmicly converted as is the 38 KHz subcarrier signal. The two logarithmically converted signals are added and then inversely logarithmically converted. The inversely logarithmically converted signal is added to the FM detection signal to produce the left channel signal while the inversely logarithmically converted signal is phase inverted then added to the FM detection signal to provide the right channel signal.
摘要翻译：一种复用解调电路，其中不需要消除滤波器来消除混合信号之间的跳动和从19KHz导频信号导出的38KHz开关信号的奇次谐波。 FM检测信号与38 KHz副载波信号对数转换。将两个对数转换的信号相加，然后对数对数转换。反向对数转换的信号被加到FM检测信号中以产生左声道信号，而反向对数转换的信号被相位反相，然后被加到FM检测信号以提供右声道信号。

7. 发明授权

US4315221A Switching circuit 失效
标题翻译：开关电路
公开(公告)号：US4315221A
公开(公告)日：1982-02-09
申请号：US78621
申请日：1979-09-25
申请人： Tatsuo Numata , Kohji Ishida
发明人： Tatsuo Numata , Kohji Ishida
IPC分类号： H03F1/00 , H03F1/30 , H03F3/18 , H03F3/20 , H03F3/30 , H03F3/72 , H03G3/10 , H03G3/34
CPC分类号： H03F1/303 , H03F3/72
摘要： A muting switching circuit for decoupling the output signal from an FM tuner including a transistor PNP-NPN pair push-pull connected between the terminals of a power source with a current mirror circuit supplying bias to the transistor pair in response to an input muting control signal. A middle point potential equal to one-half the voltage of the power source supplying current to the circuit is connected to a common connection point of the transistor pair so that when the transistors are rendered nonconductive by control of the input control signal, the common connection point thereof, which is also the output terminal of the circuit, is brought to the middle point potential immediately so that no pop noise is produced in the output signal. Preferably, a capacitor is coupled between the source of the middle point potential and ground to slow down transitions in the output signal when the power source is switched off or on to thereby prevent pop noise in the output signal at that time.
摘要翻译：一种静噪切换电路，用于将来自FM调谐器的输出信号去耦，该FM调谐器包括连接在电源端子之间的晶体管PNP-NPN对推挽，电流镜电路响应于输入静噪控制信号向晶体管对提供偏置。等于提供电流的电源的电压的一半的中点电位连接到晶体管对的公共连接点，使得当通过输入控制信号的控制使晶体管变得不导通时，公共连接它也是电路的输出端，立即被带到中点电位，使得在输出信号中不产生爆音噪声。优选地，当电源被切断或接通时，电容器耦合在中点电位源和地之间以减慢输出信号中的转换，从而防止此时输出信号中的弹出噪声。

8. 发明授权

US4590615A Multipath distortion reducing circuit 失效
标题翻译：多径失真减少电路
公开(公告)号：US4590615A
公开(公告)日：1986-05-20
申请号：US622336
申请日：1984-06-19
申请人： Kiyoshi Ohtaki , Kohji Ishida
发明人： Kiyoshi Ohtaki , Kohji Ishida
IPC分类号： H04B1/10 , H04B1/16
CPC分类号： H04B1/1676
摘要： A multipath distortion reducing circuit particularly adapted for use with stereophonic receiving circuits in which the amount of mixing between right and left channels is reduced. In accordance with the invention, the envelope of the received FM signal is AM detected, and the envelope detected circuit is multiplied by the FM detected signal differentiated to provide a distortion cancelling signal. The distortion cancelling signal is summed with the detected FM signal to provide an output having a reduced multipath distortion component.
摘要翻译：特别适用于立体声接收电路的多路径失真减小电路，其中右声道和左声道之间的混合量减少。根据本发明，接收到的FM信号的包络被检测到AM，并且将包络检测电路乘以被分离的FM检测信号以提供失真消除信号。失真消除信号与检测到的FM信号相加以提供具有减小的多径失真分量的输出。

9. 发明授权

US4502148A FM Stereo demodulator for demodulating stereo signals directly from an FM intermediate frequency signal 失效
标题翻译： FM立体声解调器，用于直接从FM中频信号中解调立体声信号
公开(公告)号：US4502148A
公开(公告)日：1985-02-26
申请号：US392129
申请日：1982-06-25
申请人： Kohji Ishida , Tadashi Noguchi , Tatsuo Numata
发明人： Kohji Ishida , Tadashi Noguchi , Tatsuo Numata
IPC分类号： H03D1/22 , H04H5/00
CPC分类号： H03D1/2236 , H03D1/2209
摘要： Disclosed is an FM stereo demodulator in which components of the demodulated signal corresponding to odd harmonics of the subcarrier signal are eliminated.In order to prevent the production of odd harmonics, the multiplication between positive and negative sinusoidal subcarrier signals is performed with a stereo pilot signal and positive and negative pulse train signals produced by pulse detection of an FM signal.The multiplication signals are further added with each other to directly reproduce left and right stereophonic signals.
摘要翻译：公开了一种FM立体声解调器，其中消除了与子载波信号的奇次谐波相对应的解调信号的分量。为了防止奇次谐波的产生，利用立体声导频信号和由FM信号的脉冲检测产生的正和负脉冲串信号来执行正和负正弦副载波信号之间的相乘。乘法信号进一步相加，以直接再现左右立体声信号。

10. 发明授权

US4497063A FM stereo demodulator 失效
标题翻译： FM立体声解调器
公开(公告)号：US4497063A
公开(公告)日：1985-01-29
申请号：US392130
申请日：1982-06-25
申请人： Kohji Ishida , Tadashi Noguchi , Tatsuo Numata
发明人： Kohji Ishida , Tadashi Noguchi , Tatsuo Numata
IPC分类号： H03D1/22 , H04H5/00
CPC分类号： H03D1/2236
摘要： An FM stereo demodulator having improved separation and distortion characteristics comprising a high-frequency pulse signal which is modulated by a sinusoidal subcarrier signal produced in accordance with a stereo pilot signal. The high-frequency pulse signal is multiplied with a composite signal at a multiplier so as to reproduce left and right signals without frequency components of noise. Constructed accordingly, the invention advantageously obviates the use of a low-pass filter which injects delay characteristics and reduces gain of the composite signal from an FM demodulator.
摘要翻译：具有改进的分离和失真特性的FM立体声解调器包括由根据立体声导频信号产生的正弦副载波信号调制的高频脉冲信号。高频脉冲信号在乘法器上与复合信号相乘，以便再现没有噪声频率分量的左和右信号。相应地构造，本发明有利地避免使用注入延迟特性并降低来自FM解调器的复合信号的增益的低通滤波器。

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