FACILITY OF PHASE AUTOMATIC CLOCK FREQUENCY CONTROL OF ANALOG-TO-DIGITAL CONVERTERS IN MULTICHANNEL SYSTEMS OF SEISMIC DATA ACQUISITION Russian patent published in 2003 - IPC

FIELD: message transmission systems with conversion of analog signals to digital form on basis of delta modulation, multichannel telemetering systems of seismic data acquisition. SUBSTANCE: technical result of invention lies in such organization of automatic clock frequency control that operation of all ADCs incorporated in multichannel telemetering system of seismic data acquisition is ensured and authenticity of transmission of seismic information is raised. Facility of phase automatic clock frequency control of analog-to-digital converters in multichannel system of seismic data acquisition includes clock generator coupled to clock input of digital filter and delta modulator of analog-to-digital converter connected in series. According to invention facility incorporates first D flip-flop to which clock input interrogation signal from communication line arrives and to which information input signal of readiness of analog-to-digital converter comes. Clock generator includes quartz generator which output is coupled to clock input of second D flip-flop and to clock inputs of two counters-frequency dividers connected in series. Information input of first counter-frequency divider is connected to output of first D flip-flop and its load input is connected to output of second D flip-flop. Information input of the latter is connected to overflow output of second counter-frequency divider whose one position output is output of clock generator and is coupled to clock inputs of digital filter and delta modulator. EFFECT: raised authenticity of transmitted seismic information. 1 dwg