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Jouve S.A., EPO - Publication - KB, TaggedPDF v1.27
EP-0495672-A2-19920722
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EP-0495672-A2-19920722
A white noise suppressing circuit for suppressing white noise contained in a received voice of a loud-speaker telephone includes a filter (4) for suppressing white noise contained in an aural input signal input to an aural signal line (1), a switch (7) for short-circuiting the filter, a detecting circuit (8) for detecting the aural input signal, and a comparator (9) for comparing an output of the detecting circuit with a preset voltage and for controlling the switch on the basis of the results of the comparison. When it is determined by the comparator that there is a voice input, the switch is short-curcuited to make the filter inoperable. When there is no voice input, the switch is opened so as to make the filter operate. To improve the operation in the presence of high noise but low voice signal, specially connected charge and discharge time constant circuits (23a, 23b, 24a, 24b) of long and short time constants may be included between the detecting circuit and the comparator (Fig. 7).
A white noise suppressing circuit for suppressing white noise contained in a received voice of a loud-speaker telephone includes a filter (4) for suppressing white noise contained in an aural input signal input to an aural signal line (1), a switch (7) for short-circuiting the filter, a detecting circuit (8) for detecting the aural input signal, and a comparator (9) for comparing an output of the detecting circuit with a preset voltage and for controlling the switch on the basis of the results of the comparison. When it is determined by the comparator that there is a voice input, the switch is short-curcuited to make the filter inoperable. When there is no voice input, the switch is opened so as to make the filter operate. To improve the operation in the presence of high noise but low voice signal, specially connected charge and discharge time constant circuits (23a, 23b, 24a, 24b) of long and short time constants may be included between the detecting circuit and the comparator (Fig. 7).
en
European Patent Office
EP0495672
EP 0495672
H04M 01/60
H04B 01/10
White noise suppression circuit
White noise suppression circuit - European Patent Office - EP 0495672 A2
White noise suppression circuit - European Patent Office - EP 0495672 A2
Adobe PDF Library 8.0
"EP0495672"; "EP 0495672"; "H04M 01/60"; "H04B 01/10"; "White noise suppression circuit"
1.4
1
B
11
EP
0495672
A2
1992-07-22
92300423
1992-01-17
JP
1929091
1991-01-18
JP
3213891
1991-01-31
H04M 01/60
H04B 01/10
NEC CORPORATION
Ehara, Tatsuji, c/o NEC Corporation
Komoda, Motoyoshi, c/o NEC Corporation
Matsushita, Akimasa, c/o NEC Saitama Ltd.
Abnett, Richard Charles et al
White noise suppression circuit
Schaltung zur Unterdrückung von weissem Rauschen
White noise suppression circuit
Circuit de suppression de bruit blanc
A white noise suppressing circuit for suppressing white noise contained in a received voice of a loud-speaker telephone includes a filter (4) for suppressing white noise contained in an aural input signal input to an aural signal line (1), a switch (7) for short-circuiting the filter, a detecting circuit (8) for detecting the aural input signal, and a comparator (9) for comparing an output of the detecting circuit with a preset voltage and for controlling the switch on the basis of the results of the comparison. When it is determined by the comparator that there is a voice input, the switch is short-curcuited to make the filter inoperable. When there is no voice input, the switch is opened so as to make the filter operate. To improve the operation in the presence of high noise but low voice signal, specially connected charge and discharge time constant circuits (23a, 23b, 24a, 24b) of long and short time constants may be included between the detecting circuit and the comparator (Fig. 7).
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