FPGA Central

Hi,

in leaner PCM to u-law convertion code, some one define CLIP=8159, an
some define CLIP= 32635. Which one is correct?

Thanks in advance!

Ron

Ron,

I searched on the web and found g711.c code which mentions
CLIP = 8159.

//============ from the code =====================================

#define BIAS (0x84) /* Bias for linear code. */
#define CLIP 8159

/** linear2ulaw() - Convert a linear PCM value to u-law

//================================================== ==============

http://www.cobalt.chem.ucalgary.ca/p...diochat/g711.c

Regards
Bharat Pathak

Arithos Designs
www.arithos.com





>Hi,
>
>in leaner PCM to u-law convertion code, some one define CLIP=8159, and
>some define CLIP= 32635. Which one is correct?
>
>Thanks in advance!
>
>Ron
>
>
>

Ron,

If you should check your codes, I suggest that different codes are
prepared for different numbers of PCM bits for input valus.

Kamar Ruptan
DSP Guru

y17476 wrote:
> Hi,
>
> in leaner PCM to u-law convertion code, some one define CLIP=8159, and
> some define CLIP= 32635. Which one is correct?
>
> Thanks in advance!
>
> Ron

y17476 wrote:
> Hi,
>
> in leaner PCM to u-law convertion code, some one define CLIP=8159, and
> some define CLIP= 32635. Which one is correct?
>
> Thanks in advance!
>
> Ron

The implementation with clip=8159 is probably designed to work with
14-bit data. The implementation with clip=~4x is probably designed to
work with 16-bit data.

--
Jim Thomas Principal Applications Engineer Bittware, Inc
[email protected] http://www.bittware.com (603) 226-0404 x536
The sooner you get behind, the more time you'll have to catch up

Thanks you all for your response.

Ron
>y17476 wrote:
>> Hi,
>>
>> in leaner PCM to u-law convertion code, some one define CLIP=8159, and
>> some define CLIP= 32635. Which one is correct?
>>
>> Thanks in advance!
>>
>> Ron
>
>The implementation with clip=8159 is probably designed to work with
>14-bit data. The implementation with clip=~4x is probably designed to
>work with 16-bit data.
>
>--
>Jim Thomas Principal Applications Engineer Bittware, Inc
>[email protected] http://www.bittware.com (603) 226-0404 x536
>The sooner you get behind, the more time you'll have to catch up
>