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    • 3. 发明授权
    • Stereo demodulator system
    • 立体声解调器系统
    • US4140878A
    • 1979-02-20
    • US832896
    • 1977-09-13
    • Mitsuo Ohsawa
    • Mitsuo Ohsawa
    • H03F3/343H03D1/22H03F3/34H03F3/45H04H1/00H04H40/45H04H5/00
    • H03F3/45103H03D1/2227
    • A stereo demodulator system includes first and second differential amplifiers differentially responding to a first form of a stereo signal and at least a pair of differentially connected transistors serially connected to the output circuit of the first differential amplifier and responding to a second signal related to the first signal. A current mirror circuit is provided from the output circuit of the second differential amplifier to the pair of differentially connected transistors to produce a mixed output signal at the output terminal of the pair of transistors to separate the stereo signal into component signals. An offset current compensator is provided to avoid producing an offset current in the mixed output signal.
    • 立体声解调器系统包括对第一形式的立体声信号进行差分响应的第一和第二差分放大器以及串联连接到第一差分放大器的输出电路的至少一对差分连接的晶体管,并且响应与第一 信号。 从第二差分放大器的输出电路向一对差分连接的晶体管提供电流镜电路,以在该对晶体管的输出端产生混合输出信号,以将立体声信号分离成分量信号。 提供偏移电流补偿器以避免在混合输出信号中产生偏移电流。
    • 4. 发明授权
    • Circuit for demodulating a stereo signal
    • 用于解调立体声信号的电路
    • US4074075A
    • 1978-02-14
    • US736306
    • 1976-10-28
    • Mitsuo Ohsawa
    • Mitsuo Ohsawa
    • H03D1/22H04H1/00H04H40/45H04H5/00
    • H03D1/229H03D1/2227
    • A circuit for demodulating a composite stereo signal of the type including a main-channel (L+R) signal and a sub-channel (L-R) signal to derive therefrom individual channel information signals L and R, respectively. A switching circuit of the balanced-modulator type is supplied with the composite stereo signal at one set of input terminals and with a switching signal whose frequency is equal to the sub-carrier onto which the sub-channel (L-R) signal is modulated, at another set of input terminals. The switching circuit produces oppositely-phased sub-channel signals which are applied to first and second current generators, respectively. An amplifier is supplied with the composite stereo signal to amplify the main-channel (L+R) signal, the amplifier including a channel separation control to adjustably vary the currents flowing through the amplifier so as to correspondingly vary the main-channel (L+R) currents. The main-channel currents produced by the amplifier and the oppositely-phased sub-channel currents produced by the current generators are supplied to respective output terminals whereat they are combined to produce the separate channel information signals L and R with minimum crosstalk.
    • 一种用于解调包括主信道(L + R)信号和子信道(L-R)信号的类型的复合立体声信号的电路,从而分别导出各个信道信息信号L和R. 平衡调制器类型的开关电路在一组输入端子处提供复合立体声信号,并且具有频率等于子信道(LR)信号被调制到的子载波的开关信号,在 另一组输入端子。 开关电路产生分别施加到第一和第二电流发生器的反相子通道信号。 放大器被提供有复合立体声信号以放大主通道(L + R)信号,放大器包括通道分离控制器,以可调节地改变流过放大器的电流,从而相应地改变主通道(L + R)电流。 由放大器产生的主通道电流和由电流发生器产生的相反的子通道电流被提供给相应的输出端子,在这些输出端子上它们被组合以产生具有最小串扰的单独的通道信息信号L和R.