SPEECH DETECTION DEVICE HAVING TWO SWITCH-OFF CRITERIONS

摘要

In a speech detection device (8) for detecting a speech signal (SS1, SS2) that has a sufficiently good signal-to-noise ratio in a received signal (MS) and for determining a speech time slot (TS1, TS2, TS3, TS4) is included a switch-on threshold detector (11) for delivering first detection information (DI1) when the energy content of the received signal (MS) exceeds a first energy threshold (ES1), and includes a switch-off threshold detector (12) for delivering second detection information (DI2) when the energy content of the received signal (MS) falls short of a second energy threshold (ES2), the second energy threshold (ES2) being smaller than the first energy threshold (ES1), and includes information processing means (13) for receiving and processing the first detection information (DI1) and the second detection information (DI2) and for terminating the production of speech detection information (SDI) featuring a speech time slot (TS1, TS2, TS3, TS4) if the second detection information (DI2) was received during a first switch-off period (TA1), while the information processing means (13) are arranged for additionally terminating the delivery of speech detection information (SDI) if the first detection information (DI1) was not received during a second switch-off period (TA2) and/or if the first detection information (DI1) was received during a third switch-off period (TA3), whereas the beginning of the third switch-off period (TA3) is determined when the second detection information (DI2) is received for the first time after the first detection information (DI1) had not been received.