| 摘要 |
An analog to digital data storage system includes receiver means for receiving an incoming signal carrying an analog component from a suitable transmitter. The analog signal is preferably preceded by a designated address code which is specific to a particular data storage system. The system further includes enable means activated by the incoming signal to emit an enable signal (logic high) to activate the system circuitry. The enable means may comprise a decoder which has been programmed to recognize an address code specified to a particular receiver or group of receivers or may be activated simply by the incoming signal without an address code, to emit the enable signal. The system also includes conversion means for converting the incoming analog data to digital format and memory means for storing the converted digital data. The conversion means further includes circuitry for reconverting a digital signal to analog format. Control means are provided for activating the conversion means and the digital memory storage means responsive to the enable signal from the decoder means. In the preferred embodiment, the control means also acts to deactivate the conversion means and memory means at the completion of the message or after a predetermined period of time. Switching means for included for activating the conversion means and the memory means for playback in analog format of any stored messages. The system further includes amplifier means for listening to incoming analog signals and playback of stored messages.
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