초록 ▼

A variable rate transmission method that can vary the transmission rate of data. A transmitting side supplies a transmitted data sequence to an error detecting encoder 105 and a frame memory 103. The frame memory 103 stores data of a variable length to be transmitted in one frame. The error detectin

A variable rate transmission method that can vary the transmission rate of data. A transmitting side supplies a transmitted data sequence to an error detecting encoder 105 and a frame memory 103. The frame memory 103 stores data of a variable length to be transmitted in one frame. The error detecting encoder 105 calculates an error detecting code (such as CRC code) for each frame of the transmitted data. A multiplexer 104 adds the calculated error detecting code ahead of the transmitted data to place it at the initial position of the frame, and sequentially outputs the data sequence frame by frame. A receiving side calculates an error detecting code of the data in each transmitted frame in the same manner as the transmitting side, and compares the calculated error detecting code with the error detecting code at the initial position of the frame. The end bit of the frame data is decided as a position at which the two error detecting codes coincide. This makes it possible to transmit variable length data without informing the receiving side of the data length in each frame. This is equivalent that the transmission rate can be varied freely.

대표청구항 ▼

[ What is claimed is:] [1.] A variable rate transmission method which varies an average transmission rate by transmitting each frame of a fixed duration, said frame holding data of a variable length,wherein a transmitting side comprises the steps of:calculating in each frame an error detecting code

[ What is claimed is:] [1.] A variable rate transmission method which varies an average transmission rate by transmitting each frame of a fixed duration, said frame holding data of a variable length,wherein a transmitting side comprises the steps of:calculating in each frame an error detecting code of data to be transmitted;transmitting said data to be transmitted and said error detecting code in said each frame at a predetermined fixed transmission rate; andpausing transmission in a blank of each frame, said blank being a part of said frame at which said data to be transmitted or said error detecting code is absent,wherein a receiving side comprises the steps of:receiving said each frame at said fixed transmission rate;detecting said error detecting code in said each frame; andrecovering said transmitted data of the variable length in said each frame in response to a detecting result of said error detecting code,wherein said step of detecting said error detecting code sequentially divides received data in said each frame by predetermined data while shifting said received data bit by bit, and decides that said error detecting code is detected at a point at which said received data can be divided.