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This commit is contained in:
Steve Underwood
2014-05-01 02:56:53 +08:00
parent 942215637a
commit b205313f4f
3 changed files with 66 additions and 38 deletions
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libs/spandsp/src/dds_float.c
+39 -23
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@@ -2100,6 +2100,12 @@ static const float sine_table[SINELEN] =
-0.00306796f
};
SPAN_DECLARE(float) dds_phase_to_radians(uint32_t phase)
{
return phase*2.0f*3.1415926f/(65536.0f*65536.0f);
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(int32_t) dds_phase_ratef(float frequency)
{
return (int32_t) (frequency*65536.0f*65536.0f/SAMPLE_RATE);
@@ -2124,6 +2130,24 @@ SPAN_DECLARE(float) dds_scaling_dbovf(float level)
}
/*- End of function --------------------------------------------------------*/
static __inline__ float dds_lookupx(uint32_t phase)
{
return sine_table[phase >> (32 - SLENK)];
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(float) dds_lookupf(uint32_t phase)
{
return dds_lookupx(phase);
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(float) dds_offsetf(uint32_t phase_acc, int32_t phase_offset)
{
return dds_lookupx(phase_acc + phase_offset);
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(void) dds_advancef(uint32_t *phase_acc, int32_t phase_rate)
{
*phase_acc += phase_rate;
@@ -2134,34 +2158,17 @@ SPAN_DECLARE(float) ddsf(uint32_t *phase_acc, int32_t phase_rate)
{
float amp;
amp = sine_table[*phase_acc >> (32 - SLENK)];
amp = dds_lookupx(*phase_acc);
*phase_acc += phase_rate;
return amp;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(float) dds_lookupf(uint32_t phase)
{
return sine_table[phase >> (32 - SLENK)];
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(float) dds_modf(uint32_t *phase_acc, int32_t phase_rate, float scale, int32_t phase)
{
float amp;
amp = sine_table[*(phase_acc + phase) >> (32 - SLENK)]*scale;
*phase_acc += phase_rate;
return amp;
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(complexf_t) dds_complexf(uint32_t *phase_acc, int32_t phase_rate)
{
complexf_t amp;
amp = complex_setf(sine_table[(*phase_acc + (1 << 30)) >> (32 - SLENK)],
sine_table[*phase_acc >> (32 - SLENK)]);
amp = dds_lookupx(*phase_acc + phase)*scale;
*phase_acc += phase_rate;
return amp;
}
@@ -2169,8 +2176,17 @@ SPAN_DECLARE(complexf_t) dds_complexf(uint32_t *phase_acc, int32_t phase_rate)
SPAN_DECLARE(complexf_t) dds_lookup_complexf(uint32_t phase)
{
return complex_setf(sine_table[(phase + (1 << 30)) >> (32 - SLENK)],
sine_table[phase >> (32 - SLENK)]);
return complex_setf(dds_lookupx(phase + (1 << 30)), dds_lookupx(phase));
}
/*- End of function --------------------------------------------------------*/
SPAN_DECLARE(complexf_t) dds_complexf(uint32_t *phase_acc, int32_t phase_rate)
{
complexf_t amp;
amp = complex_setf(dds_lookupx(*phase_acc + (1 << 30)), dds_lookupx(*phase_acc));
*phase_acc += phase_rate;
return amp;
}
/*- End of function --------------------------------------------------------*/
@@ -2178,8 +2194,8 @@ SPAN_DECLARE(complexf_t) dds_complex_modf(uint32_t *phase_acc, int32_t phase_rat
{
complexf_t amp;
amp = complex_setf(sine_table[(*phase_acc + phase + (1 << 30)) >> (32 - SLENK)]*scale,
sine_table[(*phase_acc + phase) >> (32 - SLENK)]*scale);
amp = complex_setf(dds_lookupx(*phase_acc + phase + (1 << 30))*scale,
dds_lookupx(*phase_acc + phase)*scale);
*phase_acc += phase_rate;
return amp;
}