Sughrue, Mion, Zinn, Macpeak and Seas
Near-instantaneous companding PCM involving accumulation of less significant bits removed from original data
 A data transmission system combines a near-instantaneous companding system with PCM or DPCM transmission data. In the transmitting side, lower bits are removed from an original data, to form transmission data and are accumulated in an accumulator. When a carry is caused as a result of such accumulation, the carry is added to the transmission data. Thus, total amount of the original data can be transmitted to the receiving side, thereby to improve a transmission quality and to reduce quantizing-noise. When the removed bits are subject to an addition, it is determined whether an overflow occurs. When the overflow occurs, the addition is not performed and such a logic operation as to prevent the overflow is performed. 
Sansui Electric Co., Ltd.
H
H03M
inventional
Hiroyuki Susumu
Kanzaki Takahashi