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Expand on r48273 (from issue 8506), to translate more of the fskmodem stuff to English.

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r48273 dealt with the comments and such, this deals with the code itself.
(This couldn't have been easily done if it weren't for 48273 - thanks again for that merbanan)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@48276 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Jason Parker
2006-12-05 20:15:37 +00:00
parent 33c09cbcfa
commit 87f81679ee
4 changed files with 30 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
main/fskmodem.c
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@@ -104,7 +104,7 @@ static double coef_out[NBW][8] = {
/*! Band-pass filter for MARK frequency */
static inline float filtroM(fsk_data *fskd,float in)
static inline float filterM(fsk_data *fskd,float in)
{
int i, j;
double s;
@@ -123,7 +123,7 @@ static inline float filtroM(fsk_data *fskd,float in)
}
/*! Band-pass filter for SPACE frequency */
static inline float filtroS(fsk_data *fskd,float in)
static inline float filterS(fsk_data *fskd,float in)
{
int i, j;
double s;
@@ -142,7 +142,7 @@ static inline float filtroS(fsk_data *fskd,float in)
}
/*! Low-pass filter for demodulated data */
static inline float filtroL(fsk_data *fskd,float in)
static inline float filterL(fsk_data *fskd,float in)
{
int i, j;
double s;
@@ -164,18 +164,18 @@ static inline float filtroL(fsk_data *fskd,float in)
return s;
}
static inline int demodulador(fsk_data *fskd, float *retval, float x)
static inline int demodulator(fsk_data *fskd, float *retval, float x)
{
float xS,xM;
fskd->cola_in[fskd->pcola] = x;
xS = filtroS(fskd,x);
xM = filtroM(fskd,x);
xS = filterS(fskd,x);
xM = filterM(fskd,x);
fskd->cola_filtro[fskd->pcola] = xM-xS;
fskd->cola_filter[fskd->pcola] = xM-xS;
x = filtroL(fskd,xM*xM - xS*xS);
x = filterL(fskd,xM*xM - xS*xS);
fskd->cola_demod[fskd->pcola++] = x;
fskd->pcola &= (NCOLA-1);
@@ -197,7 +197,7 @@ static int get_bit_raw(fsk_data *fskd, short *buffer, int *len)
spb2 = spb/2.;
for (f = 0;;) {
if (demodulador(fskd, &x, GET_SAMPLE))
if (demodulator(fskd, &x, GET_SAMPLE))
return -1;
if ((x * fskd->x0) < 0) { /* Transition */
if (!f) {
@@ -219,7 +219,7 @@ static int get_bit_raw(fsk_data *fskd, short *buffer, int *len)
return f;
}
int fsk_serie(fsk_data *fskd, short *buffer, int *len, int *outbyte)
int fsk_serial(fsk_data *fskd, short *buffer, int *len, int *outbyte)
{
int a;
int i,j,n1,r;
@@ -242,9 +242,9 @@ int fsk_serie(fsk_data *fskd, short *buffer, int *len, int *outbyte)
just start sending a start bit with nothing preceding it at the beginning
of a transmission (what a LOSING design), we cant do it this elegantly */
/*
if (demodulador(zap,&x1)) return(-1);
if (demodulator(zap,&x1)) return(-1);
for(;;) {
if (demodulador(zap,&x2)) return(-1);
if (demodulator(zap,&x2)) return(-1);
if (x1>0 && x2<0) break;
x1 = x2;
}
@@ -253,7 +253,7 @@ int fsk_serie(fsk_data *fskd, short *buffer, int *len, int *outbyte)
beginning of a start bit in the TDD sceanario. It just looks for sufficient
level to maybe, perhaps, guess, maybe that its maybe the beginning of
a start bit, perhaps. This whole thing stinks! */
if (demodulador(fskd, &fskd->x1, GET_SAMPLE))
if (demodulator(fskd, &fskd->x1, GET_SAMPLE))
return -1;
samples++;
for(;;) {
@@ -263,7 +263,7 @@ search_startbit2:
return 0;
}
samples++;
if (demodulador(fskd, &fskd->x2, GET_SAMPLE))
if (demodulator(fskd, &fskd->x2, GET_SAMPLE))
return(-1);
#if 0
printf("x2 = %5.5f ", fskd->x2);
@@ -279,7 +279,7 @@ search_startbit3:
return 0;
}
for(;i;i--) {
if (demodulador(fskd, &fskd->x1, GET_SAMPLE))
if (demodulator(fskd, &fskd->x1, GET_SAMPLE))
return(-1);
#if 0
printf("x1 = %5.5f ", fskd->x1);
@@ -320,7 +320,7 @@ getbyte:
a >>= j;
/* We read parity bit (if exists) and check parity */
if (fskd->paridad) {
if (fskd->parity) {
olen = *len;
i = get_bit_raw(fskd, buffer, len);
buffer += (olen - *len);
@@ -328,7 +328,7 @@ getbyte:
return(-1);
if (i)
n1++;
if (fskd->paridad == 1) { /* parity=1 (even) */
if (fskd->parity == 1) { /* parity=1 (even) */
if (n1&1)
a |= 0x100; /* error */
} else { /* parity=2 (odd) */