Patent ID: 8634770
Filing Date: 2014-01-21
Classification: H04L,H04W

Abstract:
1. A portable device comprising: a storage unit for storing audio data and video data; a content type determining unit for determining a type of content that is to be subjected to a reproduction process whether the type of content is video content or audio content; a short-range wireless communication unit for transmitting the audio data of the content to an external device having a short-range communication function in short-range wireless communication; a transmission buffer unit for buffering the audio data that is to be transmitted to the external device by the short-range wireless communication unit and outputting the audio data to the short-range wireless communication unit; a time management unit having a timer function, for sending the transmission buffer unit an instruction of transmitting the audio data to the short-range wireless communication unit based on time measured by the timer function; and a jitter control unit for determining whether an underflow arises at the transmission buffer unit and, when determining that the underflow arises at the transmission buffer unit, controlling the transmission buffer unit in such a manner as not to output the audio data currently buffered in the transmission buffer unit to the short-range wireless communication unit, wherein, when the content type determining unit determines that the content to be subjected to the reproduction process contains the video data and when the underflow arises at the transmission buffer unit, the jitter control unit discards the audio data that is not output to the short-range wireless communication unit at a time indicated by the time management unit, wherein, when the content type determining unit determines that the content to be subjected to the reproduction process does not contain the video data and when the underflow arises at the transmission buffer unit, the jitter control unit controls the transmission buffer unit in such a manner as to output the audio data to the short-range wireless communication unit after the transmission buffer unit recovers from the underflow, wherein the jitter control unit determines that the underflow arises at the transmission buffer unit when an amount of data buffered in the transmission buffer unit is equal to or below a predetermined threshold, wherein the predetermined threshold is set in accordance with a determination result made by the content type determining unit, wherein, when the input data is video content constituted by audio data and video data, a first threshold is used to determine, by the jitter control unit, whether the underflow arises at the transmission buffer unit, wherein, when the input data is music content, a second threshold value is used, and wherein the first threshold is different from the second threshold, and the first threshold is smaller than the second threshold.