Method and apparatus for detecting voice activity
First Claim
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1. A method for voice activity detection on an input signal using a log likelihood ratio (LLR), comprising the steps of:
- determining and tracking instant, minimum and maximum power levels of the input signal;
selecting a first predefined range of signals of the input signal to be considered as noise signals;
selecting a second predefined range of signals of the input signal to be considered as voice signals;
using the voice signals, noise signals and power levels for calculating the LLR;
using the LLR for determining a threshold; and
using the threshold for differentiating between noise and voice in the input signal.
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Abstract
Method and apparatus detect voice activity for spectrum or power efficiency purposes. The method determines and tracks the instant, minimum and maximum power levels of the input signal. The method selects a first range of signals to be considered as noise, and a second range of signals to be considered as voice. The method uses the selected voice, noise and power levels to calculate a log likelihood ratio (LLR). The method uses the LLR to determine a threshold, then uses the threshold for differentiating between noise and voice.
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Citations
10 Claims
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1. A method for voice activity detection on an input signal using a log likelihood ratio (LLR), comprising the steps of:
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determining and tracking instant, minimum and maximum power levels of the input signal; selecting a first predefined range of signals of the input signal to be considered as noise signals; selecting a second predefined range of signals of the input signal to be considered as voice signals; using the voice signals, noise signals and power levels for calculating the LLR; using the LLR for determining a threshold; and using the threshold for differentiating between noise and voice in the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus including a communications device having a voice activity detection processor for controlling spectral efficient or power efficient voice transmissions relating to an input signal, said voice activity detection processor being configured to execute processing including:
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determining and tracking instant, minimum and maximum power levels of the input signal; selecting a first predefined range of signals of the input signal to be considered as noise signals; selecting a second predefined range of signals of the input signal to be considered as voice signals; using the voice signals, noise signals and power levels for calculating a log likelihood ratio (LLR); using the LLR for determining a threshold; and using the threshold for differentiating between noise and voice in the input signal.
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Specification