公开(公告)号：US3943466A

公开(公告)日：1976-03-09

申请号：US484961

申请日：1974-07-01

申请人： Evangelo Lyghounis

发明人： Evangelo Lyghounis

IPC分类号： H03M1/58 ,  H03M1/00 ,  H04B1/64 ,  H03G7/00 ,  G08C15/06 ,  H03K13/02

CPC分类号： H04B1/64 ,  H03M1/56 ,  H03M1/82

摘要： Amplitude samples of voice signals to be transmitted by pulse-code modulation are compared with a quasi-exponential reference voltage generated during each sampling interval while a binary counter receives a train of isochronous clock pulses, the reading of the counter at the instant of a match being stored in a memory for subsequent insertion into a message frame. Positive and negative signals are distinguished by a sign bit preceding the amplitude code; in one embodiment the reference voltage is sequentially generated with opposite polarities in successive halves of a sampling interval, the counter having an additional stage to generate the sign bit. Decoding at the receiving end is achieved with the aid of another binary counter whose output is compared with the amplitude code and, in the event of a match, causes the instantaneous value of a similar reference voltage to be sampled and stored for subsequent integration.

摘要翻译： 将通过脉冲编码调制传输的语音信号的振幅样本与在每个采样间隔期间产生的准指数参考电压进行比较，而二进制计数器接收一串同步时钟脉冲，在匹配时刻读取计数器 存储在存储器中以便随后插入到消息帧中。 正和负信号由幅度码之前的符号位区分; 在一个实施例中，参考电压在采样间隔的连续两半中以相反的极性依次产生，该计数器具有产生符号位的附加级。 借助于另一个二进制计数器来实现接收端的解码，该二进制计数器的输出与幅度码进行比较，并且在匹配的情况下，使类似参考电压的瞬时值被采样并存储以用于随后的积分。