US Patent 7509253 Device for determining latency between stimulus and response

A device which uses an input of speech and measures latency between stimulus and response. The device generally includes an input transducer for converting a stimulus speech sound into an electrical signal and transmits the electrical signal to an electric circuit. In the preferred embodiment, the electric circuit includes a central processing unit which utilizes delay time counters to measure the length of time between signals. A second input transducer is used to convert a response speech sound into an electrical signal and transmits the electrical signal to the electric circuit. Each input transducer operates on a separate channel, so that the central processing unit may easily distinguish between stimulus sounds and response sounds.