1976-11-19
1977-09-06
Heyman, John S.
328 15, H03K 518
Patent
active
040471152
ABSTRACT:
A sample pulse generating apparatus is provided having an input signal supply circuit for supply an input signal with a high frequency to be sampled, a saw tooth wave generator for generating a saw tooth wave signal which is in synchronism with the input signal and has lower frequency than that of the input signal, a staircase signal generator for generating a staircase signal of which the voltage level is stepped up in synchronism with the occurrence of the saw tooth wave signal, a voltage comparator for receiving the saw tooth wave signal and the staircase wave signal and comparing them and producing a sampling signal when those signals coincide with each other, and an observation signal generator for generating an observation signal which is analogous in wave shape to the input signal and has lower frequency than that of the input signal, by sampling the input signal by the sampling pulses. The sample pulse generating apparatus further includes a counter for executing the count every occurrence of the sample pulse and a memory for previously storing in the order of the saw tooth wave signal generation the signals each with the magnitude corresponding to the time error of each sampling pulse occurrence due to non-linearity of the saw tooth wave signal and for successively generating digital correction signals each corresponding to the magnitude of each stored signal in response to the digital signal of the counter. The staircase signal to be applied to the voltage comparator is the sum of the output of the counter and the digital correction signal from the memory.
REFERENCES:
patent: 3654562 (1972-04-01), Reilly et al.
patent: 3848586 (1974-11-01), Suzuki et al.
patent: 3877022 (1975-04-01), Lehman et al.
Miki Tetsuya
Toda Koichi
Yamaguchi Haruo
Anritsu Electric Co. Ltd.
Heyman John S.
Nippon Telegraph and Telephone Public Corporation
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