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    • 41. 发明授权
    • Signal processsing circuit for a telephone set
    • 电话机信号处理电路
    • US4791638A
    • 1988-12-13
    • US106692
    • 1987-10-13
    • Norikazu FujieHitoshi Sugiyama
    • Norikazu FujieHitoshi Sugiyama
    • H04M1/58
    • H04M1/585
    • A signal processing circuit for a telephone set. This circuit includes signal sending means that sends to a transmission line a sound signal produced from a telephone transmitter, a first adding circuit that adds the signal from the transmission line to the sound signal from the transmitter, an inverting circuit that phase-inverts the output signal from the first adding circuit, an impedance element provided between the transmission line and the output of the inverting circuit, and a second adding circuit that adds the output sound signal from the transmitter to the output signal from the inverting means and supplies the resulting composite signal to a telephone receiver.
    • 一种用于电话机的信号处理电路。 该电路包括信号发送装置,其向传输线发送从电话发射机产生的声音信号,将来自传输线的信号与来自发射机的声音信号相加的第一加法电路,将反相电路相位反相的反相电路 来自第一加法电路的信号,设置在传输线和反相电路的输出之间的阻抗元件,以及第二加法电路,其将来自发射器的输出声音信号与来自反相装置的输出信号相加,并将所得到的复合物 信号到电话接收机。