Displaying 5 results from an estimated 5 matches for "shape_bits".
2006 Sep 18
2
Exc CB Search very little Question
...r a codebook, finding
nb_subvect codebook entries to quantize the excitation signal. After
finding these nb_subvect codebook entries, they're written into the stream:
/*save indices*/
for (i=0;i<nb_subvect;i++)
{
ind[i]=nind[0][i];
speex_bits_pack(bits,ind[i],params->shape_bits+have_sign);
}
I want to know if I'm correct in that I can just do sth like this
without any effect on the encoded signal:
/*put optimal values into array*/
for (i=0;i<nb_subvect;i++)
{
ind[i]=nind[0][i];
}
/*Change the order of the values in the array*/
// this i...
2007 Feb 26
3
probably heap corruption detection
Hi,
So I see in:
split_cb_shape_sign_unquant
this call is going wrong:
ind[i] = speex_bits_unpack_unsigned(bits, params->shape_bits);
ind as a way negative number- basically this should return bet.
0-255 or somesuch right?
So seems like I need to reset speex at this point if
if (ind[i] > 256) like the note says. So I guess my question is
is this range still valid?
also what is the most innocuous value for ind[i] - 0?
T...
2006 Sep 18
2
Exc CB Search very little Question
Hello,
just to make sure I haven't gotten anything wrong:
In cb_search.c (function split_cb_search_shape_sign) after all that
searching nb_subvect CB entries are being written into the stream. These
are all taken from the same codebook.
If I wanted to, I could just change their order, couldn't I?
Because important is only the linear combination of them all together,
which I keep
2007 Aug 06
2
11kbps narrowband on a 24bit DSP
...ltp_params ltp_params_lbr = {
gain_cdbk_lbr,
5,
7
};
/* Split-VQ innovation parameters narrowband */
static const split_cb_params split_cb_nb_med = {
8, /*subvect_size*/
5, /*nb_subvect*/
exc_8_128_table, /*shape_cb*/
7, /*shape_bits*/
0,
I have three problems.
1. My DSP has 24 bits register and memory with a 24 X 24 = 48 bit
multiply and a 56 bit accumulator. I see scaling shifts when using 32
bit registers. Can anyone tell me what scaling values like
#define LPC_SCALING 8192
#define SIG_SCALING 16384...
2007 Aug 06
0
11kbps narrowband on a 24bit DSP
...;
>
>
> /* Split-VQ innovation parameters narrowband */
>
> static const split_cb_params split_cb_nb_med = {
>
> 8, /*subvect_size*/
>
> 5, /*nb_subvect*/
>
> exc_8_128_table, /*shape_cb*/
>
> 7, /*shape_bits*/
>
> 0,
>
>
>
>
>
>
>
> I have three problems.
>
>
>
> 1. My DSP has 24 bits register and memory with a 24 X 24 = 48 bit
> multiply and a 56 bit accumulator. I see scaling shifts when using 32
> bit registers. Can anyone tell me wha...