| 摘要 |
<p>For error detection in encoded speech communications, wherein a speech signal is encoded and transmitted in bit sequences (22), a received bit sequence is analysed as to its statistical properties (25). In an embodiment, wherein a received bit sequence is analysed as to its probability of occurrences in the encoded speech communications, a bit sequence is treated as an erroneous bit sequence if the probability of occurrence of this bit sequence is below of first threshold value (26). A plurality of subsequently received bit sequences may be analysed as to their probability of occurrence in the encoded speech communications. If the plurality of bit sequences comprises a number of bit sequences of which the probability of occurrence is below the first threshold value, this plurality of bit sequences is treated as comprising an error burst if this number exceeds a second threshold value (29). If an error burst has been determined, the plurality of received bit sequences may be replaced (31). The speech signal may be encoded following a Delta modulation technique, in particular Continuous Varying Slope Delta (CVSD) modulation.</p> |
