Waveform Quantization and Compression - Digital Signal Processing: Fundamentals and Applications - page 532

{ ulawcode ¼ (tmp&0x001f)>>1;
ulawcode ¼ ulawcode j 0 x20; }
if( (tmp&0x07c0) ¼¼ 0x0040) // Segment 3
{ ulawcode ¼ (tmp&0x003f)>>2;
ulawcode ¼ ulawcode j 0x30; }
if( (tmp&0x0780) ¼¼ 0x0080) // Segment 4
{ ulawcode ¼ (tmp&0x007f)>>3;
ulawcode

¼ ulawcode j 0x40;}

if( (tmp&0x0700) ¼¼ 0x0100) // Segment 5

{ ulawcode ¼ (tmp&0x00ff)>>4;

ulawcode ¼ ulawcode j 0x50;}

if( (tmp&0x0600) ¼¼ 0x0200) // Segment 6

{ ulawcode (tmp&0x01ff)>>5;

ulawcode ¼ ulawcode j 0x60; }
if( (tmp&0x0400) ¼¼ 0x0400) // Segment 7
{ ulawcode ¼ (tmp&0x03ff)>>6;
ulawcode ¼ ulawcode

¼

j 0x70; }

if (lc> ¼ 0)
{

ulawcode ¼ ulawcode j 0x80;

}
/* u-law code (8 bit compressed PCM code) for transmission and storage */
/* Decoder: */
tmp ¼ ulawcode&0x7f;
tmp ¼ (tmp>>4);
if ( tmp ¼¼ 0x0) // Segment 0
{ dec ¼ ulawcode&0xf; }
if ( tmp ¼¼ 0x1) // Segment 1
{ dec ¼ ulawcode&0xf j 0x10; }
if ( tmp ¼¼ 0x2) // Segment 2
{ dec ¼ ((ulawcode&0xf)<<1)

j

0x20;

dec ¼ dec j 0x01; }

if ( tmp ¼¼ 0x3) // Segment 3

{ dec ¼ ((ulawcode&0xf)<<2) j 0x40;

dec ¼ dec j 0 x02; }

if ( tmp ¼¼ 0x4) // Segment 4

{ dec ¼ ((ulawcode&0xf)<<3) j 0x80;

dec ¼ dec j 0 x04; }
if ( tmp ¼¼ 0x5) // Segment 5
{ dec ¼ ((ulawcode&0xf)<<4)

j 0x0100;

dec ¼ dec j 0 x08; }
if ( tmp ¼¼ 0x6) // Segment 6
{ dec ¼ ((ulawcode&0xf)<<5)

j 0x0200;

dec ¼ dec j 0x10; }
if ( tmp ¼¼ 0x7) // Segment 7
{ dec ¼ ((ulawcode&0xf)<<6) j 0x0400;

dec ¼ dec j 0x20; }
tmp ¼ ulawcode & 0x80;