| 摘要 |
PURPOSE: A circuit for generating an audible frequency tone using an integrating circuit is provided to accurately reproduce a recorded sound without distortion when the audible frequency tone is recorded and reproduced by integrating an inputted RF(Radio Frequency) signal using the integrating circuit, multiplying the integrated RF signal, and converting the received RF signal into the audible frequency tone. CONSTITUTION: A receiving unit(300) receives an RF signal received through an antenna(ANT). An integrating unit(310) integrates the RF signal received in the receiving unit(300) and generates a triangular pulse. A frequency multiplying unit(320) multiplies the triangular pulse generated in the integrating unit(310) so that an initially received RF signal and a period of the triangular pulse are identical. A low pass filter(330) filters the triangular pulse output from the frequency multiplying unit(320) and generates a square wave. A compensating unit(340) compensates the strength of the square wave signal output from the low pass filter(330). An amplifying unit(350) amplifies the signal output from the compensating unit(340) and outputs a generated audible frequency tone.
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