TRANSMISSION SYSTEM USING AN IMPROVED SIGNAL ENCODER AND DECODER
摘要
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, differs only in one single digit. This has the advantage that a transmission error in said particular digit has a small perceptual effect, because the corresponding ternary number differs 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.
申请公布号
WO9959140(A2)
申请公布日期
1999.11.18
申请号
WO1999IB00815
申请日期
1999.05.06
申请人
KONINKLIJKE PHILIPS ELECTRONICS N.V.;PHILIPS AB
发明人
TOLHUIZEN, LUDOVICUS, M., G., M.;SLUIJTER, ROBERT, J.;GERRITS, ANDREAS, J.