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    • 2. 发明申请
    • VOICE-SWITCHED HANDSET RECEIVE AMPLIFIER
    • 语音切换手机接收放大器
    • WO1992012589A1
    • 1992-07-23
    • PCT/US1991009154
    • 1991-12-06
    • SCHUH, Peter, Otto
    • H04M01/60
    • H04M9/08
    • A voice-band receive amplifier for telephone handsets that mitigates loud sidetone and acoustic sing. A receive channel (30) with amplification and voice-switched attenuation is disposed between a receive port of a telephone network (80) at terminals (1a, 1b), and an electro-acoustic receiver (20). A transmit channel (70) having voice-switched attenuation that varies inversely with the receive channel attenuation is disposed between a transmit port of the telephone network at terminals (2a, 2b), and an acousto-electric microphone (10). A controller (60) with an output lead connecting to the transmit and receive channels has an input lead connecting to the microphone and an output lead connecting to the receiver. The controller provides a varying DC control signal at its output lead in response to varying levels of transmit and receive signals appearing at the input of the controller. The attenuation in each channel is characterized by having more attenuation at high-end voice-band frequencies than at lower frequencies.
    • 3. 发明申请
    • ADAPTIVE AMPLIFIER CIRCUIT
    • 自适应放大器电路
    • WO1992012588A1
    • 1992-07-23
    • PCT/US1991009210
    • 1991-12-06
    • SCHUH, Peter, Otto
    • H04M01/00
    • H04M1/6008
    • An adaptive amplifier circuit for a replacement handset emulates either a carbon microphone or an electret microphone, whichever is appropriate for the telephone base. The circuit couples microphone (10) and output terminal (2a) through a series connection of resistor (R1), input and output leads of an amplifier (12), and a sense circuit (22). The sense circuit controls two current sources (14), (16) in response to the shunt voltage and series current available from the telephone base. Current source (14) connects the amplifier output to input terminal (1a) and acts either as a bias current source, or as an electronic switch that provides a short circuit from the microphone to the amplifier output. Current source (16) connects in series between the amplifier ground lead and a common terminal (2b) and acts either as a bias current source, or as an electronic switch to enable or disable the amplifier. Overall amplification is controlled by negative feedback loop (20) which connects from terminal (2b) to the amplifier input.
    • 用于替换手持机的自适应放大器电路模拟碳麦克风或驻极体麦克风,以适用于电话基座为准。 电路通过电阻器(R1)的串联连接,放大器(12)的输入和输出引线和感测电路(22)耦合麦克风(10)和输出端子(2a)。 感测电路响应于可从电话基座获得的分流电压和串联电流来控制两个电流源(14),(16)。 电流源(14)将放大器输出端连接到输入端(1a),作为偏置电流源,或作为提供从麦克风到放大器输出的短路的电子开关。 电流源(16)串联连接在放大器接地引线和公共端子(2b)之间,并作为偏置电流源或作为电子开关使能或禁用放大器。 整体放大由从端子(2b)连接到放大器输入的负反馈环路(20)控制。