专利汇可以提供Reduced rate sampling process in pulse code modulation of analog signals专利检索,专利查询,专利分析的服务。并且A composite color TV signal having the chrominance modulated and interleaved at the null points of the luminance frequency spectrum is comb filtered only over the region where the chrominance occurs. The filter separates luminance from chrominance. The chrominance is further demodulated and separated into its I and Q components. Each of the Y, I and Q components being a signal having a frequency spectrum with peaks at the horizontal line rate and nulls at an odd multiple of the horizontal line rate is sampled at a respective sampling frequency which is an odd multiple of half the line rate and which is also less than the Nyquist rate. Sampling at less than the Nyquist rate results in sampling energy being ''''folded back'''' into the spectrums of the respective Y, I and Q components; however, the sampling energy will be interleaved at the null points of the respective spectrums. When the sampled signals are received, the unwanted sampling energy is comb filtered out. All of the comb filters used comb only so much of the signal frequency band which includes the energy to be eliminated. Each comb filter includes a band pass filter which has a transfer characteristic which rises rapidly to a maximum level and remains constant over the frequency band of interest. The band pass filter includes phase equalization means which provides a linear phase shift versus frequency characteristic that intersects the ordinate of a phase shift versus frequency graph at a phase shift of 2n pi where n may be any integer.,下面是Reduced rate sampling process in pulse code modulation of analog signals专利的具体信息内容。
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