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1. 发明授权

US4674121A Circuit for detecting the level of noise in FM signal for use in AM/FM receiver 失效
标题翻译：用于检测AM / FM接收机中使用的FM信号中的噪声电平的电路
公开(公告)号：US4674121A
公开(公告)日：1987-06-16
申请号：US777163
申请日：1985-09-18
申请人： Masami Miura , Naotoshi Higashiyama
发明人： Masami Miura , Naotoshi Higashiyama
IPC分类号： H03D5/00 , H04B1/16 , H04H5/00
CPC分类号： H04B1/1661 , H03D5/00
摘要： A circuit is provided for detecting the level of noises in received FM signals in an AM/FM receiver which includes at least an FM intermediate-frequency amplifier, an FM detector connected thereto, an AM intermediate-frequency amplifier and an AM detector connected thereto. This FM noise level detecting circuit includes a frequency converter receiving the output of the FM detector for converting noise components contained in the output of the FM detector into a noise signal of the AM intermediate-frequency, which is in turn outputted to the AM intermediate-frequency amplifier, so that the converted noise signal is amplified by the AM intermediate-frequency amplifier and then detected by the AM detector to produce a DC signal. The signal thus obtained is not only representative of the level of the noise contained in the received FM signal, but also representative of the received FM signal strength.
摘要翻译：提供了一种用于检测AM / FM接收机中接收的FM信号中的噪声电平的电路，其包括至少一个FM中频放大器，与其连接的FM检测器，AM中频放大器和与其连接的AM检测器。该FM噪声电平检测电路包括频率转换器，接收FM检测器的输出，用于将FM检波器的输出中包含的噪声分量转换成AM中频的噪声信号，该噪声信号又被输出到AM中间 - 使得转换的噪声信号由AM中频放大器放大，然后由AM检测器检测以产生DC信号。这样获得的信号不仅代表接收的FM信号中包含的噪声电平，而且也代表接收到的FM信号强度。

2. 再颁专利

USRE29286E Power amplifier with a bootstrapped driver stage 失效
标题翻译：功率放大器带有自举驱动级
公开(公告)号：USRE29286E
公开(公告)日：1977-06-28
申请号：US729285
申请日：1976-10-04
申请人： Hirokazu Fukaya , Naotoshi Higashiyama
发明人： Hirokazu Fukaya , Naotoshi Higashiyama
IPC分类号： H03F3/30
CPC分类号： H03F3/3091
摘要： A power amplifier includes a bootstrapped driver circuit in which the load element is divided into two parts. A single-ended push-pull circuit provides a feedback to the junction point of those two parts. A resistor element having 0.1 to 10 times the resistance of the load element is connected in parallel with the load element.

3. 发明授权

US5225793A Voltage-controlled oscillator system 失效
标题翻译：电压控制振荡器系统
公开(公告)号：US5225793A
公开(公告)日：1993-07-06
申请号：US862166
申请日：1992-04-02
申请人： Naotoshi Higashiyama , Fumikazu Ohkubo , Tetsuo Nakamura
发明人： Naotoshi Higashiyama , Fumikazu Ohkubo , Tetsuo Nakamura
IPC分类号： H03B5/32 , H03B5/36 , H03L7/099
CPC分类号： H03B5/368 , H03B2200/002 , H03B2200/004
摘要： A ceramic resonator, a variable reactance circuit, and a limiter circuit are connected to the output of an amplifier having an output that is fed back to the positive phase-sequence input, and the frequency of oscillation is controlled by varying an equivalent capacitance of the reactance circuit with a control voltage applied to the reactance circuit. The limiter circuit ensures a variable frequency range on the high frequency side, and the symmetry of the capture range when this system is applied to a PLL can be improved.

4. 发明授权

US4390746A Stereo signal demodulator having an improved separation characteristic 失效
标题翻译：具有改进的分离特性的立体声信号解调器
公开(公告)号：US4390746A
公开(公告)日：1983-06-28
申请号：US182646
申请日：1980-08-29
申请人： Naotoshi Higashiyama , Kazuyuki Doi
发明人： Naotoshi Higashiyama , Kazuyuki Doi
IPC分类号： G10L11/02 , H04H1/00 , H04H40/45 , H04H40/63 , H04H5/00
CPC分类号： H04H40/63 , G10L25/78
摘要： A stereo signal demodulator includes a switching circuit for separating the stereo composite signal into left and right signal components. A composite stereo signal is attenuated in a preset quantity and superimposed upon the left and right signal components after they are separated by the switching circuit. The superimposed signals cancel the crosstalk components, not by switching the composite signal, but only by attenuating the stereo composite signal in the preset quantity. Consequently, the attenuator for reducing the stereo composite signal can be provided separately from the switching circuit for the stereo demodulation. The switching circuit can then be driven by the entire power supply voltage without any DC potential loss caused by the attenuator. Moreover, there is no DC potential loss by the attenuator, and transistors of the stereo switching circuit can operate with a power voltage margin. The distortion-free dynamic range of the output can be widened and the separation factor can be enhanced. The bias voltage of the active elements is also raised, so that the distortion factor characteristics can be improved. The composite signal attenuated in the preset quantity is superimposed upon the demodulated left and right signal components. Thus, it is possible to eliminate the distortion in the attenuated composite signal, and especially to eliminate the distortion in the demodulated output signals.
摘要翻译：立体声信号解调器包括用于将立体声复合信号分离成左和右信号分量的切换电路。复合立体声信号以预设的量衰减，并且在由开关电路分离之后叠加在左和右信号分量上。叠加的信号消除串扰分量，而不是通过切换复合信号，而是通过衰减预设数量的立体声复合信号。因此，用于降低立体声复合信号的衰减器可以与用于立体声解调的开关电路分开提供。然后，开关电路可以由整个电源电压驱动，而没有由衰减器引起的任何DC电位损失。此外，衰减器没有DC电位损失，立体声开关电路的晶体管可以以电源电压裕度工作。可以扩大输出的无变形动态范围，提高分离系数。有源元件的偏置电压也上升，从而可以提高失真因子特性。以预设量衰减的复合信号叠加在解调的左右信号分量上。因此，可以消除衰减的复合信号中的失真，特别是消除解调输出信号中的失真。

5. 发明授权

US4380823A Multi-channel signal processing circuit formed in a semiconductor integrated circuit 失效
标题翻译：多通道信号处理电路形成于半导体集成电路中
公开(公告)号：US4380823A
公开(公告)日：1983-04-19
申请号：US57370
申请日：1979-07-13
申请人： Naotoshi Higashiyama , Kazuyuki Doi
发明人： Naotoshi Higashiyama , Kazuyuki Doi
IPC分类号： H04B1/16 , H03D5/00 , H04B1/26
CPC分类号： H03D5/00
摘要： A semiconductor chip contains a multi-channel signal-processing circuit for processing signals in different frequency bands (e.g., an AM and an FM receiver). An inductor is coupled via an external terminal on a package for the semiconductor chip to a first signal-processing circuit. A circuit detects when a connection is made between the inductor and a power supply terminal contained in the semiconductor chip. When the inductor is connected to the power supply terminals, the first signal-processing circuit is activated, while the second signal-processing circuit is deactivated. When the inductor is disconnected from the power supply terminal, the second signal-processing circuit is activated, while the first signal-processing circuit is deactivated. The circuit for detecting a connection between the inductor and the power supply terminal is either a circuit for detecting a potential change or a circuit for detecting an oscillating signal. The inductor may be either an oscillator coil or an IF transformer winding.
摘要翻译：半导体芯片包含用于处理不同频带（例如，AM和FM接收机）中的信号的多声道信号处理电路。电感器经由用于半导体芯片的封装上的外部端子耦合到第一信号处理电路。电路检测何时在电感器和包含在半导体芯片中的电源端子之间进行连接。当电感器连接到电源端子时，第一信号处理电路被激活，而第二信号处理电路被去激活。当电感器与电源端子断开时，第二信号处理电路被激活，而第一信号处理电路被去激活。用于检测电感器和电源端子之间的连接的电路是用于检测电位变化的电路或用于检测振荡信号的电路。电感器可以是振荡器线圈或中频变压器绕组。

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