## 1aSP6. On the use of the zero-crossing analysis for multi-channel signal processing.

### Session: Monday Morning, December 2

### Time: 11:30

**Author: Takaaki Sugihara**

**Location: Dept. of Info. Elec., Nagoya Univ., Furo-cho 1, Chikusa-ku Nagoya-shi, 464-01 Japan**

**Author: Shoji Kajita**

**Location: Dept. of Info. Elec., Nagoya Univ., Furo-cho 1, Chikusa-ku Nagoya-shi, 464-01 Japan**

**Author: Kazuya Takeda**

**Location: Dept. of Info. Elec., Nagoya Univ., Furo-cho 1, Chikusa-ku Nagoya-shi, 464-01 Japan**

**Author: Fumitada Itakura**

**Location: Dept. of Info. Elec., Nagoya Univ., Furo-cho 1, Chikusa-ku Nagoya-shi, 464-01 Japan**

**Abstract:**

Since time precision in finding delays between channels is one of the most
important issues in estimating direction of arrival (DOA) from multichannel
signals, a zero-crossing analysis is proposed as a fine and robust time-domain
preprocessing for the DOA finding. As for the preliminary evaluation of noise
robustness using zero-crossing information, how the zero-crossing points are
affected is investigated, i.e., how far the zero-crossing points move from the
original points, under the presence of noise. For test speech, a 48-kHz sampling
of a male voice (upsampled from an 8-kHz signal) is used after an adding machine
generated white noise so that the SNR of the signal becomes 0 to 20 dB. The
robustness of the zero-crossing analysis can be concluded from the summarized
results: (1) the mean value of the distance is less than 100 (mu)s throughout
the SNR; and (2) the standard deviation of the distribution becomes large as the
SNR decreases; the standard deviation is less than 0.125 even under the
condition of 0 dB SNR.

ASA 132nd meeting - Hawaii, December 1996