Digital transmission system
阅读：124发布：2023-05-12
专利汇可以提供Digital transmission system专利检索，专利查询，专利分析的服务。并且In the digital transmission system of the type in which from the transmitter are transmitted VSB- or SSB-modulated pulses of the sampling-point-zero-cross type multi-level pulse signal having the clock or pilot signal for timing and the carrier inserted at the ends of the band of said multi-level pulse signal, and at the receiving end said clock signal and said carrier are recovered to demodulate the modulated multi-level pulse signal, the intersymbol interferences at the sampling points spaced by one and two time slots apart from the center sampling point of the single pulse response in the transmission line are detected and used to automatically control the optimum phases of the recovered clock signal and carrier.，下面是Digital transmission system专利的具体信息内容。
1. In a carrier pulse sideband transmission system of the type including means providing an input multilevel signal, a clock pilot signal and a carrier signal, the improvement comprising means for shaping said input multilevel signals to single pulse response waveforms having zero levels at determined instants before and after the maximum level; means for adding said clock pilot signal to said single pulse response waveforms; means for sideband modulating said carrier signal with said single pulse response waveforms having said clock pilot signal inserted therein; means for adding said carrier signal to said modulated carrier signal; means for transmitting the sum of said carrier and modulated carrier signals; means for receiving said transmitted signal; means for separating said carrier signal from said received signal; means for demodulating said received signal with said separated carrier signals to produce received signal waveforms corresponding to said single pulse response waveforms; means for separating said clock pilot signal from said demodulated signal; means for detecting intersymbol interference comprising means for sampling the demodulated signal less said separated pilot signal at a first point and at second points adjacent said first point and corresponding to equally spaced apart instants of said single pulse response waveforms; means for controlling the phase of said separated clock pilot signals in response to said detected intersymbol interferences to eliminate intersymbol interferences; and means responsive to said controlled phase clock pilot signals for converting the interference-free demodulated signal less said pilot signal to provide multi-level pulse signals.
2. The carrier pulse transmission system of claim 1 wherein said means for detecting intersymbol interferences comprises means for detecting voltage representative of the amount of intersymbol interferences at a first pair of second points on opposite sides of said first point, and wherein said means for controlling the phase of said separated clock pilot signal comprises means for controlling said phase whereby the difference between the intersymbol interferences detected at a second pair of second points also on opposite sides of said first point approaches zero, said first pair of second points corresponding to instants of said single response pulse waveforms separated from the first point by twice the duration of the separation between said first point and said second pair of second points.
3. The carrier pulse transmission system of claim 1 wherein said means for sideband modulating comprises means for vestigial sideband modulating said carrier signal.
4. The carrier pulse transmission system of claim 1 wherein said means for sideband modulating said carrier signal comprises means for single sideband modulating said carrier signal.
5. In a method for digital pulse transmission of the type including transmission of a vestigial sideband or single sideband multi-level pulse modulated signal in which the level is zero at determined instants before and after the maximum level and having a clock signal and a carrier inserted at the opposite ends of the band of the modulated signal, receiving the transmitted signal and extracting the carrier from the received signal, demodulating the received signal by the carrier, extracting the clock signal from the demodulated signal, and converting the demodulAted signal to a multi-level pulse signal with the extracted clock signal, the improvement comprising the steps of detecting voltages representative of the amount of intersymbol interferences at two first points adjacent a center point of the waveform of the demodulated signal less said clock signal, said first points and center point corresponding to the instants of zero level and maximum level respectively of the multi-level pulse signal and controlling the phase of said extracted clock signal to reduce the difference between the voltages representative of intersymbol interferences detected at said two first points to zero.
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