Loading patent…
AssigneePioneer Electronic Corporation
InventorTakashi Okano
Estimating the term…
Method and system for phase comparison which uses a ramp-form signal generated from a reference frequency signal and a sampling pulse train signal synchronized with an input signal whose phase change is to be detected. The reference frequency signal, through a dividing circuit is normally utilized for generating the ramp-form signal while a shift pulse signal is generated when a phase of the sampling pulse train signal is deviated outside a predetermined section of each ramp portion of the ramp-form signal, and utilized for generating the ramp-form signal. By this feature, sampling times of the ramp-form signal are always maintained within the predetermined section of each ramp portion of the ramp-form signal even if a frequency of the input signal deviates very widely from the frequency of the reference frequency signal.
A method of phase comparison, including a ramp-form signal generating step for generating a ramp-form signal, and sample and hold step for sampling levels of said ramp-form signal with a sampling pulse train signal which is synchronized with a predetermined input signal whose phase change is to be detected and providing a hold level of sampled signals as a phase error signal, wherein said ramp-form signal generating step comprises:
An apparatus of phase comparison, including ramp-form signal generating means for generating a ramp-form signal, and sample and hold means for sampling levels of said ramp-form signal with a sampling pulse train signal which is synchronized with a predetermined input signal whose phase change is to be detected and providing a hold level of sampled signals as a phase error signal, wherein said ramp-form signal generating means comprises:
A method of phase comparison, including a ramp-form wave signal generating step for generating a ramp-form wave signal having return to initial value periods, and sample and hold step for sampling levels of said ramp-form wave signal with a sampling pulse train signal which is synchronized with a predetermined input signal whose phase change is to be detected and provided a hold level of sampled signals as a phase error signal, wherein said ramp-form wave signal generating step comprises:
An apparatus of phase comparison, including ramp-form wave signal generating means for generating a ramp-form wave signal having return to initial value periods, and sample and hold means for sampling levels of said ramp-form wave signal with a sampling pulse train signal which is synchronized with a predetermined input signal whose phase change is to be detected and providing a hold level of sampled signals as a phase error signal, wherein said ramp-form wave signal generating means comprises:
A method of phase comparison, including a phase reference signal generating step for generating a phase reference signal, and sample and hold step for sampling levels of said phase reference signal with a sampling pulse train signal which is synchronized with a predetermined input signal whose phase change is to be detected and providing a hold level of sampled signals as a phase error signal, wherein said phase referene signal generating step comprises:
An apparatus of phase comparison, including phase reference signal generating means for generating a phase reference signal, and sample and hold means for sampling levels of said phase reference signal with a sampling pulse train signal which is synchronized with a predetermined input signal whoses phase change is to be detected and providing a hold level of sampled signals as a phase error signal, wherein said phase reference signal generating means comprises:
Dependencies are inferred from the claim text.