| 摘要 |
PCT No. PCT/JP91/00917 Sec. 371 Date Mar. 11, 1992 Sec. 102(e) Date Mar. 11, 1992 PCT Filed Jul. 9, 1991 PCT Pub. No. WO92/01332 PCT Pub. Date Jan. 23, 1992.An FM demodulator which generates a modulated object signal directly in digital form, wherein an input FM signal is phase detected, then converted to digital form, then quantized into a pulse density modulated binary signal using a clock reference signal having a frequency which is not correlated to the frequency of the input FM signal, and then the signal is filtered at the clock reference signal and outputted as the digital word output. Advantageously, by using the non-correlated clock reference signal, the signal to noise ratio is improved by a substantial factor.
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