QUANTIZER FOR A DPCM-CODER

摘要

"A QUANTIZER FOR A DPCM-CODER" A read-only memory (ROM) is supplied with addresses in the form of DPCM-signal values (.DELTA.s) which are to be quantized but without the sign bits. The readout code words (CW) represent the quantised DPCM-signal values. The quantizer limits the DPCM-signal values and thus also the number of different code words (CW) which are to be read out. The sign bit is again combined with the read-out code words to form quantised DPCM-signal values (.DELTA. s9). In addition the input values and the read-out code words can be rounded off by the omission of the lowest-value bit. Switching of stores may be provided to enable different quantisation curves. (Fig. 2)