发明名称 |
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.
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申请公布号 |
WO9959140(A8) |
申请公布日期 |
2000.04.20 |
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. |
分类号 |
G10L19/005;H03M7/30;(IPC1-7):G10L9/14 |
主分类号 |
G10L19/005 |
代理机构 |
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主权项 |
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地址 |
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