| 摘要 |
PURPOSE: An audio system for controlling a voice level is provided to solve the inconvenience in the system which is produced and managed corresponding to each producer and model due to a difference in the voice level corresponding to each producer and model. CONSTITUTION: An attenuation unit(4) attenuates and controls audio signals of a transmitting unit and a receiving unit in order to be a proper level. A first OP AMP(Operational Amplifying) unit(2) amplifies the audio signals from the receiving unit which are attenuated through the attenuation unit. A second OP AMP unit(3) amplifies the audio signals from the transmitting unit. The attenuation unit is an IC(Integrated Circuit) which attenuates levels of a transmitting sound and a receiving sound. The attenuation unit performs communication with MCU and I2C data. [Reference numerals] (2,3) OP AMP unit; (20) PSTN line combination unit; (4) Attenuation unit; (60) AUDIO AMP unit; (70) AUDIO PROCESSOR unit; (80) SPEAKER PHONE unit; (AA) Connection; (BB) Call path; |
