Voice command of audio emitting device
A method of extracting a voice command produced in an enclosed or partially enclosed environment, includes providing an impulse response signal of the enclosed or partially enclosed environment; recording the voice command and ambient sounds; and using the impulse response signal to extract the recorded voice command.
1. A method of controlling an operating parameter of an audio emitting device using voice commands in an enclosed or partially enclosed environment where the audio emission device is producing audio emissions in response to a received audio electrical signal, comprising:
(a) storing an electrical impulse response signal of the enclosed or partially enclosed environment, wherein the impulse response signal is provided by emitting a short duration audio pulse into the enclosed or partially enclosed environment and measuring the sound characteristics of the impulse;
(b) providing a microphone for receiving a voice command signal by a user and the audio emission from the audio emitting device to provide a composite electrical signal representing both the received audio emission and the received voice command signal;
(c) forming a convolution of the electrical impulse response signal with the received audio electrical signal to produce a convolved electrical signal representing the audio emissions from the audio emitting device;
(d) subtracting the convolved electrical signal from the composite electrical signal to produce a voice-command electrical signal; and
(e) using the voice-command electrical signal to change an operating parameter of the audio emission device.
2. The method of claim 1 wherein the impulse response signal is provided by emitting a chirp audio signal into the enclosed or partially enclosed environment and converting the audio information formed by the chirp audio signal into the impulse response signal.
3. The method of claim 1 wherein the impulse response signal is provided by emitting a substantially white noise signal into the enclosed or partially environment and converting the audio information formed by the substantially white noise signal into the impulse response signal.