公开(公告)号：US20020099537A1

公开(公告)日：2002-07-25

申请号：US10043517

申请日：2002-01-11

Applicant: U.S. PHILIPS CORPORATION

Inventor： Ludovicus M.G.M. Tolhuizen ,  Robert J. Sluijter

IPC: G10L021/00 ,  G10L019/00

CPC classification number: G10L19/005 ,  G10L2019/0001 ,  G10L2019/0013

Abstract: In a transmission system a signal to be transmitted is applied to a source encoder (4) for being encoded. The encoded signal is applied to a channel encoder (6) which applies an error correcting code on the encoded input signal. The output signal of the channel encoder (6) is transmitted to a receiver (14) which processes the received signal by means of a channel decoder (18) and a source decoder (20). The source encoder comprises a codebook entry selector (42) which selects a ternary number generated by a ternary generator (26), such that a synthetic signal derived from said ternary number is a best approximation of a signal to be encoded. The ternary value found in this way is converted into a binary number in such a way that the ternary values corresponding to binary numbers which differ only in one particular digit, differ only in one single digit. This has the advantage that a transmission error of in said particular digit has a small perceptual effect, because the corresponding ternary number differ only slightly. In a preferred embodiment the numerical value of a first codebook entry corresponds to an index of a second codebook entry, and the numerical value of the second codebook entry corresponds to the index of the first codebook entry.

Abstract translation: 在传输系统中，要发送的信号被施加到用于编码的源编码器（4）。 编码信号被施加到在编码的输入信号上应用纠错码的信道编码器（6）。 信道编码器（6）的输出信号被发送到接收机（14），接收机（14）借助于信道解码器（18）和源解码器（20）处理接收的信号。 源编码器包括码本条目选择器（42），其选择由三元生成器（26）生成的三进制数，使得从所述三进制数导出的合成信号是待编码的信号的最佳近似值。 以这种方式找到的三元值被转换为二进制数，使得对应于仅在一个特定数字中不同的二进制数的三元值仅在一个数字中不同。 这样做的优点在于，所述特定数字的传输误差具有较小的感知效果，因为对应的三进制数不同。 在优选实施例中，第一码本条目的数值对应于第二码本条目的索引，并且第二码本条目的数值对应于第一码本条目的索引。