Insertion loss circuit for voice switch
专利汇可以提供Insertion loss circuit for voice switch专利检索，专利查询，专利分析的服务。并且PURPOSE:To secure the more natural two-way talking for the call of the loudspeaker telephone, by varying the duration of the pulse which drives the analog switch in accordance with the level difference between the transmission signal and the reception signal. CONSTITUTION:Both the reception signal sent from telephone circuit 10 and the transmission signal from terminal T receive the pulse amplitude modulation via analog switches 12 and 12' after passing through level control amplifiers 11 and 11' each, and are then demodulated by integrating circuits 13 and 13' to be furthermore amplified by output amplifiers 14 and 14'. On the other hand, the signals underwent the level control through amplifiers 11 and 11' are converted into the DC voltage through DC voltage converters 15 and 15', and the differential of the both signals is amplified by differential amplifier 16. Then the comparison is given at comparator 18 between the output of amplifier 16 and the triangular wave output of triangular wave generating circuit 17. Thus the pulse featuring the duration according to the differential is produced. Inverter 19 applies the reverse phase featuring the pulse duration of the transmission side to the reception side. As a result, the sum of the both pulse durations is always constant, and thus the loss sum becomes constant. In this way, the loss quantity can be varied continuously in accordance with the levels of the transmission and reception signals.，下面是Insertion loss circuit for voice switch专利的具体信息内容。
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