Title:
DOPPLER SPEECH GENERATION METHOD AND APPARATUS
Document Type and Number:
WIPO Patent Application WO/1994/002070
Kind Code:
A1
Abstract:
A method of generating a natural Doppler speech even in the segmented Doppler mode. After the (I) and (Q) components of a Doppler signal are transformed by the Hilbert transformation into the left aural signal (L) and righ aural signal (R), the interval waveform (21) between the zero cross points of the aural signals (L) and (R) is taken out so as to form the positive side interval waveform (21p) which is produced by making the sign of the interval waveform (21) positive, and the negative side interval waveform (21n) which is produced by making its sign negative. In the order of the appearances of the interval waveforms (21, 22, ...), a pair of the positive and negative side interval waveforms of each of the interval waveforms are continuously connected to produce a double-length aural signal (W1). The double-length aural signals (W1, W2, ...), of the respective periods in the pulse Doppler mode are connected in order to obtain a continuous aural signal.
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Inventors:
RI TAIHO (JP)
HASHIMOTO HIROSHI (JP)
HASHIMOTO HIROSHI (JP)
Application Number:
PCT/JP1993/000985
Publication Date:
February 03, 1994
Filing Date:
July 15, 1993
Export Citation:
Assignee:
YOKOGAWA MEDICAL SYST (JP)
RI TAIHO (JP)
HASHIMOTO HIROSHI (JP)
RI TAIHO (JP)
HASHIMOTO HIROSHI (JP)
International Classes:
G01S15/89; G10L21/04; (IPC1-7): A61B8/06
Foreign References:
| JPH0221256B2 | 1990-05-14 | |||
| JPS63147444A | 1988-06-20 | |||
| JPS6125534A | 1986-02-04 | |||
| JPS63315035A | 1988-12-22 | |||
| JPS63203141A | 1988-08-23 |
Other References:
See also references of EP 0651972A4
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