Impulsive Sound Detection Directly in Sigma-Delta Domain
Recent implementations of Sigma-delta converters have achieved low cost, low power consumption and high integration while maintaining resolution as high as in Nyquist-rate converters. However its usage implies on a pre-processing stage to demodulate the source signal delivered from Sigma-delta modul...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Institute of Fundamental Technological Research Polish Academy of Sciences
2017-03-01
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| Series: | Archives of Acoustics |
| Subjects: | |
| Online Access: | https://acoustics.ippt.pan.pl/index.php/aa/article/view/1904 |
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| Summary: | Recent implementations of Sigma-delta converters have achieved low cost, low power consumption and high integration while maintaining resolution as high as in Nyquist-rate converters. However its usage implies on a pre-processing stage to demodulate the source signal delivered from Sigma-delta modulation to Pulse-Code Modulation (PCM). This work proposes an algorithm based on Discrete Cosine Transform for impulsive signal detection to be applied directly on modulated Sigma-delta bitstream, targeting to reduce computational cost in acoustic event detection applications such as gunshot recognition systems. From pre-recorded impulsive sounds in Sigma-delta format, it has been shown that the new method presents similar error rate in comparison with traditional energy-based approaches in PCM meanwhile reduces significantly the number of operation per unit of time. |
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| ISSN: | 0137-5075 2300-262X |