Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
2011-04-12
2011-04-12
Qureshi, Afsar M. (Department: 2472)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S230100, C370S235000, C370S252000, C370S394000, C375S240000
Reexamination Certificate
active
07924824
ABSTRACT:
A voice packet communications system which objectively evaluates the voice quality in real time. Voice packets received from a network are input into an adjustment circuit. The adjustment circuit evens out the periods of the voice packets, detects the drop-out of voice packets, and inserts substitute packets in the voice packet sequence. Furthermore, the adjustment circuit outputs the number of voice packets that have dropped out, the number of substitute packets that have been inserted, and the number of voice packets that have accumulated inside the circuit, as quality information in each monitoring period. A decoding circuit converts the voice packets adjusted by the adjustment circuit into voice information. A judgement circuit calculates an index that indicates the communications quality of the voice packets from the quality information using a specified calculation formula.
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Akie Kazuyoshi
Aoyagi Hiromi
Yamaguchi Nobuyuki
Yokoyama Atsushi
OKI Electric Industry Co., Ltd.
Qureshi Afsar M.
Rabin & Berdo P.C.
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