AUDIO SIGNAL QUALITY ENHANCEMENT BASED ON QUANTITATIVE SNR ANALYSIS AND ADAPTIVE WIENER FILTERING
First Claim
1. An audio signal enhancement method comprising:
- acquiring an audio signal;
estimating a signal-to-noise ratio (SNR) of an audio frame of the audio signal;
determining a SNR threshold for the audio frame;
selecting an audio signal processing technique according to a comparison of the SNR threshold to the estimated SNR of the audio frame, wherein a first-in, first-out (FIFO) signal processing technique is selected when the estimated SNR of the audio frame is less than the SNR threshold, and a log-energy voice activity detection (VAD) signal processing technique is selected when the estimated SNR of the audio frame is greater than the SNR threshold;
filtering the audio frame using a Wiener filter applying the selected signal processing technique; and
outputting the audio frame filtered using the Wiener filter applying the selected signal processing technique.
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Abstract
An audio signal enhancement method includes: acquiring an audio signal; estimating a signal-to-noise ratio (SNR) of an audio frame of the audio signal; determining a SNR threshold for the audio frame; selecting an audio signal processing technique according to a comparison of the SNR threshold to the estimated SNR of the audio frame; filtering the audio frame using a Wiener filter applying the selected signal processing technique; and outputting the audio frame filtered using the Wiener filter applying the selected signal processing technique. A first-in, first-out (FIFO) signal processing technique is selected when the estimated SNR of the audio frame is less than the SNR threshold, and a log-energy voice activity detection (VAD) signal processing technique is selected when the estimated SNR of the audio frame is greater than the SNR threshold.
19 Citations
21 Claims
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1. An audio signal enhancement method comprising:
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acquiring an audio signal; estimating a signal-to-noise ratio (SNR) of an audio frame of the audio signal; determining a SNR threshold for the audio frame; selecting an audio signal processing technique according to a comparison of the SNR threshold to the estimated SNR of the audio frame, wherein a first-in, first-out (FIFO) signal processing technique is selected when the estimated SNR of the audio frame is less than the SNR threshold, and a log-energy voice activity detection (VAD) signal processing technique is selected when the estimated SNR of the audio frame is greater than the SNR threshold; filtering the audio frame using a Wiener filter applying the selected signal processing technique; and outputting the audio frame filtered using the Wiener filter applying the selected signal processing technique. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An audio signal enhancement apparatus comprising:
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an audio acquisition device acquiring an audio signal in a vehicle; and a control unit equipped in the vehicle configured to; estimate a signal-to-noise ratio (SNR) of an audio frame of the audio signal; determine a SNR threshold for the audio frame; select an audio signal processing technique according to a comparison of the SNR threshold to the estimated SNR of the audio frame, wherein a first-in, first-out (FIFO) signal processing technique is selected when the estimated SNR of the audio frame is less than the SNR threshold, and a log-energy voice activity detection (VAD) signal processing technique is selected when the estimated SNR of the audio frame is greater than the SNR threshold; filter the audio frame using a Wiener filter applying the selected signal processing technique; and output the audio frame filtered using the Wiener filter applying the selected signal processing technique.
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21. A non-transitory computer readable medium containing program instructions for performing an audio signal enhancement method, the computer readable medium comprising:
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program instructions that estimate a signal-to-noise ratio (SNR) of an audio frame of an acquired audio signal; program instructions that determine a SNR threshold for the audio frame; program instructions that select an audio signal processing technique according to a comparison of the SNR threshold to the estimated SNR of the audio frame, wherein a first-in, first-out (FIFO) signal processing technique is selected when the estimated SNR of the audio frame is less than the SNR threshold, and a log-energy voice activity detection (VAD) signal processing technique is selected when the estimated SNR of the audio frame is greater than the SNR threshold; program instructions that filter the audio frame using a Wiener filter applying the selected signal processing technique; and program instructions that output the audio frame filtered using the Wiener filter applying the selected signal processing technique.
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Specification