Patent ID: 9332585
Filing Date: 2016-05-03
CPC Classification: H04B,H04W

Claim Text:
1. In a communication system comprising a transmitting unit including an Adaptive Differential Pulse Code Modulation (ADPCM)-based encoder and a receiving unit including an ADPCM-based decoder, the communication system employing discontinuous transmission (DTX), a method for coordinating the ADPCM-based encoder and the ADPCM-based decoder after an end of a silence period during which the transmitting unit did not transmit, the method comprising: the ADPCM-based encoder performing a first syncless reset operation in response to a first reception of audio data after the end of the silence period; the ADPCM-based encoder operating on the audio data and setting at least one encoded value in a buffer of samples; the transmitting unit transmitting the content of the buffer of samples; the receiving unit receiving the content of the buffer of samples; the ADPCM-based decoder performing a second syncless reset operation in response to the reception of the content of the buffer samples; and the decoder decoding the received content; wherein said first syncless reset operation comprises setting internal variables of the ADPCM-based encoder into same values as would be obtained after performing, by the ADPCM-based encoder, a normal reset operation and encoding a predetermined number of ADPCM-based encoder samples having a predetermined ADPCM-based encoder sample value; wherein said second syncless reset operation comprises setting internal variables of the ADPCM-based decoder respectively into same values as would be obtained after performing, by the ADPCM-based decoder, a normal reset operation and decoding a predetermined number of ADPCM-based decoder samples having a predetermined ADPCM-based decoder sample value.