Quantizer for a DPCM encoder

Details Quantizer for a DPCM encoder Quantizer for a DPCM encoder

1984-02-14

1985-09-10

Roskoski, Bernard

Communications: electrical

Audible indication

Percussion-type sound producer

375 25, H03K 1301

Patent

active

045409730

ABSTRACT:
A difference pulse code modulation ("DPCM") encoder for encoding and compressing digital data. This encoder includes a quantizer formed by a read-only memory (ROM). DPCM signal values to be quantized are supplied without a sign bit as addresses to the ROM; the code words read-out as data from the ROM in response to addresses represent the quantized DPCM signal values. The size of the ROM required for this purpose is reduced by limiting the DPCM signal values which are supplied as addresses to the ROM. The sign bit contained in the DPCM signal values is not supplied to the ROM but is added to the code words read-out of the ROM as quantized DPCM signal values. In addition, the DPCM signal values and also the code words read out of the ROM are rounded off by omission of the least significant bit.

REFERENCES:
patent: 4437087 (1984-03-01), Petr

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