Importance

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Abstract

A variable length frame transmission method making it possible to accurately and easily establish synchronism at the receiver side without redundancy of system under an environment in which a code error easily occurs. In a transmitter, a variable length frame division section 1 divides a variable length frame f into code strings f.sub.1 and f.sub.2 having a length ratio of 1:1. A first synchronization flag addition section 3-1 adds a synchronization flag S.sub.1 to the head of the code string f.sub.1 and a second synchronization flag addition section 3-2 adds a synchronization flag S.sub.2 to the head of the code string f.sub.2. The synchronization flags have contents different from each other, but they have the same length. Code strings having synchronization flags are multiplexed by a changeover switch 4 and formed into a variable length frame. A series of variable length frames obtained from the changeover switch 4 are transmitted to a receiver as serial data. In the receiver, the start and end points of each frame is obtained based on the position of each synchronization flag in the serial data.

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First Claim