The receiver of the frame-based wireless communication system is source controlled by means 20, 22, 24 including internal state variables updated on a frame-by-frame basis to modify received filter parameters indicative of a background sound transmitted on an information channel. A filter-type speech decoder. The receiver means 12, 13, 14 for detecting a frame comprising a transmission error means for determining whether the transmission error detected frame is acceptable 16 and if the detected frame is not accepted by the determining means. Means 18 are provided for limiting the update of one or more internal state variables to conceal detected transmission errors.
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