MICROPHONE SYSTEM HAVING MICROPHONE TRANSDUCER IN FEEDBACK LOOP WITH ADJUSTABLE FREQUENCY-3DB POINT AND IMPROVED SETTLING SPEED

• Main Authors: GANTA SAIKRISHNA, EZEKWE CHINWUBA
• Format: Patent
• Language: Chinese; English
• Published: 17.12.2019
• Subjects: DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; PUBLIC ADDRESS SYSTEMS

A microphone biasing circuit comprises a first amplifier having an output connected to a first node and an input connected to a second node; and a first feedback path connected from the first node tothe second node. The first feedback path comprises a microphone having a first terminal connected to the first node and a second terminal connected to a third node, the microphone being configured toprovide a sensed voltage at the first node in response to sound, the third node having a first DC bias voltage; and a first capacitor connected between the third node and the second node. 麦克风偏置电路包括：第一放大器，具有连接到第一节点的输出和连接到第二节点的输入；以及第一反馈路径，从第一节点连接到第二节点。第一反馈路径包括：麦克风，具有连接到第一节点的第一端子和连接到第三节点的第二端子，麦克风被配置为响应于声音而在第一节点处提供感测电压，第三节点具有第一DC偏置电压；以及第一电容器，连接在第三节点和第二节点之间。