Subscan controlling method for facsimile performing suppression and coding of redundancy

Abstract

Abstract PURPOSE:To prevent stopping of subscan and at the same time to eliminate the occurrence of the feed variance even through the subscan is stopped, by reducing the subscanning speed in response to the decrement of the storing capacity of a line memory in case said capacity is less than a certain level. CONSTITUTION:The lines l1 and l2 of the bit number corresponding to the minimum transmission time and the lines l3 and l4 of the bit number of 15 times as much as that of the lines l1 and l2 are stored in a buffer memory 1. When a line of a line memory 3 is recorded, an idle space of a line is produced. Then a decoder 2 start to decode the line l1. Both memories 1 and 3 have no considerable change of capacity although the l2 is decoded since the decoding speed is higher than the transmitting speed. When the line l3 has a large number of bits, and requires much time for decoding, then the memory capacity is decreased to a prescribed level or below, the subscanning speed is not maintained. Thus the subscanning speed is reduced stepwise to a set level. As a result, the stop of the subscan is prevented, and furthermore, the feed variance due to the stop can be reduced.

Inventors

• 👤 Makoto Matsuki
• 👤 松木　真
• 👤 Ryota Suzuki
• 👤 良太 鈴木
• 👤 Takafumi Arimura
• 👤 有村　孝文

Bibliographic Details