| 摘要 |
PURPOSE:To provide a demodulating system corresponding to high-speed data transmission by constituting a miniaturized and low-priced FSK receiver suitable for the configuration in an integrated circuit with less power consumption concerning an FSK demodulator used for the receiver of radio communication. CONSTITUTION:IQ signals 38 and 39 provided by direct converting reception of FSK modulation are supplied to a demodulating means 1 and a frequency detecting means 4; an output signal 2 is supplied to a clock synchronizing means 6; and a code deciding means 9 after its waveform is shaped by a low-pass filter 3. The frequency detecting means 4 detects the frequency offset amount of a local oscillator 34 by detecting the frequency changes of the IQ signals 38 and 39, decides the delay amount of a signal delay means 8, decides a code due to a code deciding point behind a symbol at a code deciding means 9 while using a clock signal 7 of that delayed clock synchronizing means 6, and gets the demodulated result. |
