| 摘要 |
This compander circuit, whose main function is the maintenance of a high signal to noise ratio, even at low signal levels, has a polygon-like characteristic which is determined by six points in a cartesian coordinate system. The coordinates are (x/64,2y/8), (x/32,3y/8),(x/16,4y/8), (x/8,5y/8),(x/4,6y/8) and (x/2,7y/8) with x,y being maximum values. The l.f.-analogue signal is divided into three channels with amplifiers (V1,V2,V3), their amplification factor being 64,8 and 1 respectively. They are followed by three corresponding A/D converters (U1,2,3,) whose outputs are routed via gates (T1,2,3,) to data processors (DVK1,2,3,). A selection circuit (AW) controls the gates (T1,2,3,). |
