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    • 1. 发明授权
    • Telephony test system with adjustable output impedance
    • 具有可调输出阻抗的电话测试系统
    • US06285744B1
    • 2001-09-04
    • US09402693
    • 1999-12-22
    • Regis J. Nero, Jr.Louis W. Hiener, IIIRichard A. Bair, Jr.Frederick J. KikoLeo W. Manuel, IILester Mintzer
    • Regis J. Nero, Jr.Louis W. Hiener, IIIRichard A. Bair, Jr.Frederick J. KikoLeo W. Manuel, IILester Mintzer
    • H04M124
    • H04M1/24H04M3/30
    • A telephone test system (2) includes a controller (4), a programmable gate array (PGA) (24) and a digital signal processor (DSP) (26) connected by a common bus (20). The PGA (24) includes an output connected to an input of a digital-to-analog converter (DAC) (36) and input connected to an output of an analog-to-digital converter (ADC) (32). A driver circuit (46) is connected between the DAC (36) and a telephone circuit (60) and between the ADC (32) and the telephone circuit (60). Under the control of the DSP (26), the driver circuit (46) generates voltages to the telephone circuit (60) and samples the response of the telephone circuit (60) to such generated voltages. The driver circuit (46) includes control inputs for receiving from the PGA (24) an impedance adjust signal (D) and a resistance adjust signal (R). An output impedance (124) of the driver circuit (46) connected to the telephone circuit (60) is adjustable as a function of the impedance adjust signal (D) and/or the resistance adjust signal (R).
    • 电话测试系统(2)包括通过公共总线(20)连接的控制器(4),可编程门阵列(PGA)(24)和数字信号处理器(DSP)26。 PGA(24)包括连接到数模转换器(DAC)(36)的输入并连接到模数转换器(ADC)(32)的输出的输入端的输出。 驱动电路(46)连接在DAC(36)和电话电路(60)之间,并连接在ADC(32)和电话电路(60)之间。 在DSP(26)的控制下,驱动电路(46)向电话电路(60)产生电压,并将电话电路(60)的响应采样到这样的发生电压。 驱动电路(46)包括用于从PGA(24)接收阻抗调整信号(D)和电阻调节信号(R)的控制输入。 连接到电话电路(60)的驱动电路(46)的输出阻抗(124)可根据阻抗调整信号(D)和/或电阻调节信号(R)而调节。