Patent ID: 8838846

Claim:
An autonomous, multi-channel, time-synchronized data acquisition transducer for use with a Universal Serial Bus (USB) hub comprising: an analog data sensor connected to an analog-to-digital converter having an output digital data signal, an electrical gating circuit connected to receive said output digital data signal, the circuit having: a voltage controlled crystal oscillator generating a local frequency signal and a parser circuit connected to monitor USB hub upstream signals and to generate a base frequency signal, the parser circuit connected to a frequency and phase comparator generating a frequency and phase mismatch error signal between the local and base frequency signals; the local frequency signal being fed into the analog-to-digital converter as a sampling clock signal governing the conversion rate from analog to digital data; a processor connected to the local oscillator and the parser in a feedback loop reducing said mismatch error signal; and a trigger module connected to the processor and to monitor USB hub upstream signals for generating a start signal from a preconfigured message indicating time gating that can be determined by the processor; whereby occurrence of the time gating message at the processor triggers data collection into the processor, the processor having an output to the USB hub now having synchronized collected data.