Speech detection device for detecting a speech signal in an input signal
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United States of America Patent
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Nov 25, 2003
Grant Date -
N/A
app pub date -
Mar 24, 2000
filing date -
Mar 25, 1999
priority date (Note) -
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Abstract
In a speech detection device (13) for detecting a speech signal (SS) in an input signal (ES), including input means (14) arranged to receive an input signal (ES) which can contain a speech signal (SS) and/or a tone signal (CNG, BSY), and including processing means (15) for processing the input signal (ES) and for supplying at least first and second characteristic information (FS1, FS2, FS3, FS4) of the input signal (ES), and including threshold test means (16) for checking whether the first and the second characteristic information (FS1, FS2, FS3, FS4) exceed a threshold value and for supplying at least one item of detection information (D1, D2, D3, D4), and including evaluation means (17) for evaluating the at least one item of detection information (D1, D2, D3, D4) and for supplying speech detection information (SDI) which is characteristic of the presence of a speech signal (SS) in the input signal (ES), the processing means (15) further include filter means (22) adapted to extract a first frequency band signal (FS1) from a first frequency band (FB1) of the input signal (ES) as first characteristic information and to extract a second frequency band signal (FS2) from a second frequency band (FB2) of the input signal (ES) as second characteristic information, the first frequency band (FB1) and the second frequency band (FB2) not overlapping one another, and the threshold test means (16) are adapted to supply first detection information (D1) when the first frequency band signal (FS1) exceeds a first amplitude threshold value (SW), and to supply second detection information (D2) when the second frequency band signal (FS2) exceeds a second amplitude threshold value (SW), and the evaluation means (17) are adapted to supply speech detection information (SDI) when the first detection information (D1(PZ)) and the second detection information (D2(PZ)) within a test time interval PZ appear at least for a threshold time interval (SZ).
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