Digital circuit transmission device

Details Digital circuit transmission device Digital circuit transmission device

2002-02-04

2009-06-09

Opsasnick, Michael N (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S215000, C704S221000

Reexamination Certificate

active

07546238

ABSTRACT:
A digital line transmission unit can carry out switching between speech codecs during the same call to achieve balance between making effective use of a line and a high sound quality without bringing about a feeling of discomfort in a user by the switching. It includes in an encoder a first speech codec7with a high sound quality and a high bit rate, a second speech codec8with a reasonable sound quality but a low bit rate. It carries out switching between these speech codecs in response to the control information an operation monitoring controller4obtains by making a decision as to the traffic volume of the bearer line111.The switching between the speech codecs is made during a speech pause a speech burst detector31in a signal detector3detects in an input speech signal.

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