Fujitsu Corporation

Yutaka Moriyama

Kazuhiro Shibuya

Noboru Kobayashi

Naoji Fujino

Toshiaki Nobumoto

Mitsuru Tsuboi

Toshiyuki Ohta

Nobuhide Eguchi

Miki Murakawa

Naomi Yokoyama

Kazuhiko Aoki

An apparatus synchronizes a voice coder and a voice decoder which are of the vector-coding type in order to prevent a false synchronization even when a signal having the same period as a string of synchronizing bits is inputted. A noise component adding unit adds a noise component to an input voice signal. Therefore, even if the input voice signal has the same period as that of a string of synchronizing bits and is completely periodic, the periodicity of the input voice signal is lost by the added noise component. Based on the input voice signal which is no longer periodic, a vector-coding unit, a quantizing signal vector generating unit, and a code book index transmitting unit generate code book indexes and transmit the generated code book indexes to a voice decoder. Therefore, the voice decoder is prevented from developing a false synchronization.

Apparatus for synchronizing a voice coder and a voice decoder of a

For the purpose of efficiently determining the transmission capacity of a digital relay transmission path, adjusting the phase between commands and responses, and detecting faults, in the case in which a judgment is made that the image information transmission path capacity between communication apparatuses is smaller than or inferior to the performance of the communication apparatuses, when a training signal for the purpose of performing a circuit check is sent from a transmitting-side facsimile machine, the transmitting-side communication apparatus intentionally sends a failed training signal to the receiving-side communication apparatus, this giving notice of an abnormal termination, in response to which the transmitting-side facsimile machine performs a fallback operation so as to reduce the communication speed to a speed at which relaying is possible between the communication apparatuses before sending the image information.

Facsimile signal relay method and apparatus therefor

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Kawasaki, Japan

Yutaka Moriyama