| 摘要 |
PURPOSE:To greatly improve a threshold level, by outputting an output of a phase synchronizing loop through a buffer means and a high-pass filter, in an FM demodulator using the phase synchronizing loop. CONSTITUTION:An output of demodulation by a phase synchronizing loop, i.e. an output of a loop filter 3 is provided to a VCO4, also is provided to a high-pass filter 7 through a buffer amplifier 6, a high band attenuated by the phase synchronizing loop is apparently raised, and the frequency characteristics are made flat up to around the subcarrier of an FM signal. Accordingly, a threshold level is greatly improved. |
