Patent ID: 7123607

Claim:
A quality control device for voice packet communications for transmitting voice packets through a quality non-assurance type network, the device comprising: a buffer memory for temporarily storing voice packets received through the network and forming a queue of the received voice packets; queue operating means for operating the queue in accordance with an operation control signal to be supplied, said queue operating means including a deletion operation portion for deleting from the queue voice packets having like-voice absence properties, being dispersed onto the queue which correspond to an operation position on the queue according to an operation position specifying signal being supplied; sequence examining means for examining like voice-absence properties of a sequence of voice information contained in a plurality of voice packets that constitute the queue stored in the buffer memory; operation control means for charging the operation control signal in accordance with an examination result of the sequence examining means, said operation control means including an operation position determining portion for determining an operation position corresponding to voice packets having like-voice absence properties, being dispersed onto the queue and outputting said operation position specifying signal as said operation control signal by the use of an examination result of the sequence examining means; increase/decrease tendency detecting means for detecting an increase and decrease tendency of a frequency in which a large and small relationship between voice power on a voice reception path and voice power on a voice transmission path changes per unit time by detecting voice power for a voice signal on the voice reception path corresponding to a transmission direction of a voice packet that constitutes the queue and a voice signal on the voice transmission path opposite to the direction where a voice is received; threshold managing means for managing an upper limit threshold set at least on an upper limit side with respect to a length of the queue; and second upper limit threshold changing means for changing an upper limit threshold in accordance with an increase and decrease tendency detected by the increase/decrease tendency detecting means.