Hands-free push-to-talk radio
AssigneeMotorola, Inc.
InventorsDaniel Landron, Ali Behboodian, Chin Wong
Life of this patent
Estimating the term…
Abstract
A hands-free digital push-to-talk device (102) includes a digital background noise suppressor (302), a digital voice activity detector (304), an audio buffer (306), as well as a decision handler (308), embedded inside the device's (102) digital signal processor (222). Audio is buffered until the decision handler (308) determines that speech is present on an audio stream fed to the voice activity detector (304). The decision handler (308) makes the decision by assigning weighted values to each voice activity detector (304) determination, the weighted value varying depending on the state of the device (102) and temporal distance from the present time.
Claims19
A wireless communication device, comprising:
- an audio input;
- an audio buffer coupled to the audio input;
- a transmit switch coupled to the audio buffer;
- a voice activity detector coupled to the audio input;
- and
- a decision handler coupled to the voice activity detector, the audio buffer, and the transmit switch,
- wherein the voice activity detector receives an audio signal from the audio input and outputs a value to the decision handler, the value representing a probability that the audio signal is a voice signal, and the decision handler, based on a current and at least one past value output from the voice activity detector, sends a decision signal that causes the transmit switch to close and the audio buffer to transmit the audio signal therefrom.
A method for automatically transmitting voice signals with a wireless device, the method comprising:
- receiving an audio signal;
- buffering the audio signal to form a buffered audio signal;
- assigning a probability factor to the audio signal;
- and
- transmitting the buffered audio signal when the probability factor exceeds a threshold enable value.
A computer program product for automatically transmitting voice signals with a wireless device, the computer program product comprising:
- a storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
- receiving an audio signal;
- buffering the audio signal to form a buffered audio signal;
- assigning a probability factor to the audio signal;
- and
- transmitting the buffered audio signal when the probability factor exceeds a threshold enable value.
Dependencies are inferred from the claim text.