Digital time base with coherent rate switching

Details Digital time base with coherent rate switching Digital time base with coherent rate switching

H - Electricity

03

K

328/87

H03K 5/00 (2006.01) H03K 5/156 (2006.01)

Patent

CA 1157109

ABSTRACT A digital time base for producing sample clock pulses is provided with a control circuit to permit coherent switching from one sample rate to another. A plurality of predetermined sampling rates and number of samples to be acquired at each rate are stored in a memory. The predetermined sampling rates provide count moduli to a counter which divides the frequency of a base clock in accordance therewith to produce the actual sam- ple clock pulses. A counter is provided to count the sample clock pulses, and when the desired number of pulses are generated, a next succeeding sampling rate and number of samples to be acquired are accessed from the memory. The rate switching to change the count modulus takes place between last sample clock pulse generated for a particular sampling rate and the next succeeding base clock pulse so that such switching is coherent.

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