| 摘要 |
PURPOSE: A transmitting and receiving apparatus is provided to reduce the amount of digital data by varying a sampling frequency according to a signal searched from a maximum frequency of an input signal. CONSTITUTION: A transmitting and receiving apparatus comprises an analog-to-digital converter(210) which parses a frequency component of an inputted analog signal, and lowers a sampling frequency when the parsed frequency component is a low frequency component. The analog-to-digital converter(210) increases the sampling frequency when the parsed frequency component is a high frequency component. A compression processor(220) compresses a digital signal outputted from the analog-to-digital converter(210). A transceiver(230) consists of a transmitter, which modulates and amplifies the compressed digital signal, and a receiver, which amplifies and demodulates a received signal. An extension processor(240) extends the received compression signal, and a digital-to-analog converter(250) converts the extended signal into an analog signal. A clock generator(260) supplies the sampling frequency to the converters(210,250).
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