Abstract: The step sizes for tap positions of an adaptive filter (124) in an echo canceller (125) for canceling an echo signal are individually selected based upon a profile of the echo environment. A training signal (112) is injected into the echo canceller and to the echo path during a training interval, or period. The adaptive filter profiles the echo path during the training interval. Respective step sizes &agr;[k] for the tap positions are generated as a function of the echo profile so generated.

Abstract: In a cellular telephone, a method of reducing background noise of an audio signal resulting from a received signal. Each digital sample of the audio signal is used to calculate an average energy of the audio signal over a number of samples. When the average energy is less than a threshold, a gain factor is calculated using the average energy and the threshold. The amplitude of the audio sample is then adjusted according to the gain factor.

Abstract: A communication device (100) and method therefore for compensating an oscillator (146). The communication device (100) includes a receiver (110) for receiving message information transmitted on a predetermined channel (105), an oscillator (146) having a frequency of operation set by a controller (116) for enabling reception of the message information on the predetermined channel (105), and a decoder (114) for decoding the message information received, and for deriving there from messages and channel quality information. The controller (116) is responsive to the messages derived, for storing the same, and further responsive to the channel quality information derived for generating a compensation signal when the value of the channel quality information exceeds a predetermined value. The compensation signal that is generated by the controller (116) effects shifting of the frequency of operation of the oscillator (146) to center reception of the communication device (100) on the predetermined channel (105).

Abstract: A syndrome assisted iterative decoder (173) uses iterative processing to decode an input sequence. A syndrome-assisted decoder (216), which may operate independently of a soft-output decoder, provides a stopping algorithm for the soft output decoder (240). When the syndromes s0 and s1 generated for sequence v0 and v1, respectively, both equal 0, the soft output decoder is finished decoding the sequence of data. Additionally, the syndrome-assisted decoder can generate a modified error trellis used by the soft output decoder whereby the soft-output decoder operates on a simplified trellis providing improved decoder performance.

Abstract: A holster (10) for a telecommunication device (12), such as a cellular telephone or wireless telephone, includes a housing (14) adapted to removably support the telecommunication device (12). The holster (10) also includes an earpiece assembly (52) including at least one transducer, such as an earbud (53) or a microphone (54), and a cord (56) depending from the at least one transducer (53, 54). The earpiece assembly (52) is extendable and retractable relative to the housing (14). The holster (10) further includes an extension/retraction assembly (32) having a spool (34) for taking up at least a portion of the cord (56) when the earpiece assembly (52) is retracted relative to the housing (14), and at least one coil spring (35) adapted to rotate the spool (34). The at least one coil spring (35) can electrically couple the at least one transducer (53, 54) to the telecommunication device (12).