Patent ID: 8320391
Filing Date: 2012-11-27
Classification: G10L,H04L

Abstract:
1. An acoustic signal packet communicating system including a first communication apparatus including a processor and both a transmitting unit and a receiving unit and a second communication apparatus including a processor and both a transmitting unit and a receiving unit, comprising: in the transmitting unit in the first communication apparatus: the acoustic signal packet communicating system further comprises: in the receiving unit in the second communication apparatus: a receiving buffer for storing therein received packets; a loss detecting unit, implemented by a processor, that determines whether or not a packet containing a frame acoustic signal associated with the number of the frame to be extracted is stored in the receiving buffer; an acoustic signal packet decoding unit, implemented by a processor, that, when it is determined in the loss detecting unit that the packet containing the frame acoustic signal associated with the frame number of the frame to be extracted is stored in the receiving buffer, extracts the frame acoustic signal from the packet stored in the receiving buffer and provides the frame acoustic signal as a frame output acoustic signal; a loss handling unit, implemented by a processor, that, when a packet loss occurs as determined in the loss detecting unit that the packet containing the frame acoustic signal associated with the frame number of the frame to be extracted is not stored in the receiving buffer, extracts an acoustic signal corresponding data for the frame as a lost frame, from a packet stored in the receiving buffer and generating a frame output acoustic signal by using the acoustic signal corresponding data; and a generating unit, implemented by a processor, that generates, as a reproduced acoustic signal, frame output acoustic signals outputted from the acoustic signal packet decoding unit or the loss handling unit and outputs the reproduced acoustic signal; said loss handling unit in the receiving unit is configured to obtain, when a packet loss occurs, acoustic signal corresponding data having the same frame number as that of a lost frame from the packet in the receiving buffer by using the delay amount control information included in the packet; the receiving unit in the second communication apparatus further comprises: a jitter and loss determining unit, implemented by a processor, that determines at least one of a jitter state of a received packet and a loss state of a received packet; a packet number determining unit, implemented by a processor, that determines as a targeted value of the number of stored packets, the number of packets to be stored in the receiving buffer by using the result of the determination made by the jitter and loss determining unit; and a sending unit, implemented by a processor, that sends the targeted value of the number of stored packets to the transmitting unit in the second communication apparatus; and the transmitting unit in the second communication apparatus comprises: a containing unit, implemented by a processor, that contains the targeted value of the number of stored packets sent from the receiving unit in the second communication apparatus in a packet as information for specifying delay amount control information to be set in the transmitting unit in the first communication apparatus; and the transmitting unit in the first communication apparatus comprises: a setting unit, implemented by a processor, that sets delay amount control information to a value smaller than or equal to the targeted value of the number of stored packets contained in a packet sent from the transmitting unit in the second communication apparatus.