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Interface for telephone answering machine tape recorder - comprises tone decoder and switching circuits allowing two ordinary tape recorders to answer telephone call
Interface for telephone answering machine tape recorder - comprises tone decoder and switching circuits allowing two ordinary tape recorders to answer telephone call
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机译:电话答录机录音机的接口-包括音频解码器和切换电路,允许两个普通的录音机接听电话
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摘要
An opto coupler converts the rining signal into dc for a transistor timing circuit to control an opto coupler and trial to switch the mains power to a recorder. This plays a tone recorded on an endless cassette tape from an oscillator. When completed the tape is rewound ready for the next communication. - The tone signal is calibrated and amplified and is routed via a tone decoder which converts it to a logic level. The tone is also transmitted onto the telephone line. The logic level signals are routed via a counter which sends pulses to latching and unlatching circuits which ensure that power is applied to a second recorder. The line relay is operated to record the communication which is routed via an impedance matching circuit.
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