公开(公告)号：US3931482A

公开(公告)日：1976-01-06

申请号：US463669

申请日：1974-04-24

申请人： Yukio Sugimoto ,  Makoto Okamasa ,  Toyoshi Fukumura

发明人： Yukio Sugimoto ,  Makoto Okamasa ,  Toyoshi Fukumura

IPC分类号： H04H20/89 ,  H04S3/00 ,  G11B3/74 ,  H04B5/00

CPC分类号： H04H20/89 ,  H04S3/006

摘要： In a four-channel stereophonic reproducing system of the type in which a first, second, third and fourth audio signals are reproduced from two stereophonic composite signals which are respectively comprised of a left side signal consisting of a main channel signal composed of the sum of the first and second audio signals and a sub-channel signal obtained by frequency modulating or phase modulating the difference between the first and second audio signals, and a right side signal consisting of a main channel signal composed of the sum of the third and fourth audio signals and a sub-channel signal obtained by frequency modulating or phase modulating the difference between the third and fourth audio signals, a detector circuit for detecting each sub-channel signal is followed by a filter circuit for eliminating undesired higher frequencies whereby to eliminate higher audio frequencies including increased noise components to improve the S/N ratio, and at the same time a phase correction circuit is provided in the reproducing section for each main channel signal to correct for any phase distortion due to the filter circuit whereby to ensure a greatly improved separation.

摘要翻译： 在这种类型的四通道立体声再现系统中，其中从两个立体声复合信号再现第一，第二，第三和第四音频信号，这两个立体声复合信号分别包括由主信道信号组成的左侧信号， 第一音频信号和第二音频信号以及通过对第一和第二音频信号之间的差进行频率调制或相位调制获得的子信道信号，以及由第三和第四音频之和组成的主信道信号组成的右侧信号 信号和通过对第三和第四音频信号之间的差进行频率调制或相位调制获得的子信道信号，用于检测每个子信道信号的检测器电路之后是用于消除不期望的更高频率的滤波器电路，从而消除较高音频 频率包括增加的噪声分量以提高S / N比，同时进行相位校正ci 在每个主信道信号的再现部分提供电路，以校正由于滤波电路引起的任何相位失真，从而确保大大改善的分离。

公开(公告)号：US4013845A

公开(公告)日：1977-03-22

申请号：US463668

申请日：1974-04-24

申请人： Yukio Sugimoto ,  Makoto Okamasa ,  Toyoshi Fukumura

发明人： Yukio Sugimoto ,  Makoto Okamasa ,  Toyoshi Fukumura

IPC分类号： H04R3/00 ,  H04R3/04 ,  H04R1/16

CPC分类号： H04R3/04 ,  H04R3/00

摘要： A record reproducing system comprising a displacement detection type cartridge and a reproducing circuit for converting the output signal of the displacement detection type cartridge into audio signals. Either the displacement detection type cartridge or a pre-amplifier in the reproducing circuit is provided with a temperature sensitive resistive element so that temperature compensation with respect to the output-temperature characteristic of the displacement detection type cartridge may be effected at either the displacement detection type cartridge or the reproducing circuit.

公开(公告)号：US3936619A

公开(公告)日：1976-02-03

申请号：US463667

申请日：1974-04-24

申请人： Yukio Sugimoto ,  Makoto Okamasa ,  Toyoshi Fukumura

发明人： Yukio Sugimoto ,  Makoto Okamasa ,  Toyoshi Fukumura

IPC分类号： H04B1/10 ,  H04S3/00 ,  G11B3/00 ,  G11B3/74 ,  H04B5/00

CPC分类号： H04S3/006

摘要： There is provided a four-channel stereophonic reproducing system wherein each muting circuit comprises a limiter for limiting the carrier level of a frequency-modulated signal to a predetermined level, a control circuit actuated by the output of the limiter and a switching circuit controlled by the control circuit, whereby when the carrier level of the frequency-modulated signal decreases, the detected output of the sub-channel signal including a large amount of noise components is blocked by the muting circuit.

摘要翻译： 提供了一种四通道立体声再现系统，其中每个静音电路包括用于将调频信号的载波电平限制到预定电平的限幅器，由限幅器的输出启动的控制电路和由 控制电路，由此当调频信号的载波电平降低时，包含大量噪声分量的子信道信号的检测输出被静音电路阻挡。