Speech transmission and reception system for digital communication
AssigneeOki Electric Industry Co., Ltd.
InventorsToshio Kato, Atsushi Shimbo
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Abstract
A transmission device performs encoding by a speech encoding portion including a speech encoder and error correction encoder, and transmits a continuous signal without any further processing. A reception device receives the continuous signal and performs channel decoding and speech decoding as one unit by a speech decoding portion including a soft-decision error correction decoder and a soft-decision speech decoder. Thus, a transmission and reception system performs an accurate signal reproduction without removing the signal including a normal bit error rate by correcting the error by the speech decoder.
Claims7
A speech transmission and reception system for digital communication, the system comprising:
- a speech encoding portion for transmitting an audio signal, the portion including:
- a speech encoder for compressing and encoding the audio signal to be transmitted, and
- an error correction encoder for performing a convolution encoding of the compression encoded audio signal;
- and
- a speech decoding portion for receiving the an audio signal, the portion including:
- a soft-decision error correction decoder for performing an error correction decoding of the received audio signal as a multivalue signal, and obtaining a soft-decision output including a probability information that represents a probability of each signal after being processed by the error correction decoding, and
- a soft-decision speech decoder for receiving the soft-decision output, and reproducing the most probable code sequence in accordance with the probability information and a state transition probability, so as to decode the audio signal.
Dependencies are inferred from the claim text.