公开(公告)号：US4151518A

公开(公告)日：1979-04-24

申请号：US777956

申请日：1977-03-16

申请人： Erik L. Jansson ,  Tommy E. Svensson

发明人： Erik L. Jansson ,  Tommy E. Svensson

IPC分类号： H03M1/00 ,  H04J3/00 ,  H03K13/02

CPC分类号： H04J3/00 ,  H03M1/005 ,  H03M1/504

摘要： A PCM codec for converting between PCM words and analog signals has at least one element which is used for both types of conversions even though the clock pulse frequencies of the incoming and outgoing PCM words are different; a timing unit for generating time intervals wherein a first and second number are needed at the very most to carry out the respective conversion operations, the shorter of the period lengths determined by the two clock pulse frequencies includes at least the sum of the two numbers of time intervals; and a control unit for receiving the clock pulses in order to indicate the respective conversion type and for generating conversion type signals by means of which each of the time intervals is associated with one of the two conversion types. In order to control states where a type signal is generated delayed with respect to a notification pulse, the codec includes information memories to store the influenced information. And in order to control states where the control unit interrupts the present conversion operation of one type due to the priority of the other type, the codec includes a result memory to store such intermediate results which make it possible to continue the interrupted operation after the termination of the priority operation.

摘要翻译： 用于在PCM字和模拟信号之间转换的PCM编解码器具有至少一个元件，其用于两种类型的转换，即使输入和输出PCM字的时钟脉冲频率不同; 用于产生时间间隔的定时单元，其中最多需要第一和第二数量来执行相应的转换操作，由两个时钟脉冲频率确定的较短的周期长度至少包括两个数字的和 时间间隔; 以及控制单元，用于接收时钟脉冲，以指示相应的转换类型，并产生转换类型信号，通过该转换类型信号，每个时间间隔与两种转换类型之一相关联。 为了控制相对于通知脉冲延迟的类型信号的状态，编解码器包括用于存储受影响的信息的信息存储器。 并且为了控制由于其他类型的优先级而使控制单元中断一种类型的当前转换操作的状态，编解码器包括存储这样的中间结果的结果存储器，这使得可以在终止之后继续中断的操作 的优先操作。