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For anti-aliasing, the baseband filter bandwidth is automatically set to the

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widest available setting that is no more than 75% of the sample rate.  This
happens every time the sample rate is set.  If you want to override the
baseband filter selection, you must do so after setting the sample rate.
This commit is contained in:
Michael Ossmann
2017-01-26 18:26:46 -07:00
parent 5968e7d861
commit f388a3f9d9
1 changed files with 13 additions and 1 deletions
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14
host/libhackrf/src/hackrf.c
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@ -1109,6 +1109,11 @@ typedef struct {
} set_fracrate_params_t;
/*
* You should probably use hackrf_set_sample_rate() below instead of this
* function. They both result in automatic baseband filter selection as
* described below.
*/
int ADDCALL hackrf_set_sample_rate_manual(hackrf_device* device,
const uint32_t freq_hz, uint32_t divider)
{
@ -1135,10 +1140,17 @@ int ADDCALL hackrf_set_sample_rate_manual(hackrf_device* device,
{
return HACKRF_ERROR_LIBUSB;
} else {
return HACKRF_SUCCESS;
return hackrf_set_baseband_filter_bandwidth(device,
hackrf_compute_baseband_filter_bw((uint32_t)(0.75*freq_hz/divider)));
}
}
/*
* For anti-aliasing, the baseband filter bandwidth is automatically set to the
* widest available setting that is no more than 75% of the sample rate. This
* happens every time the sample rate is set. If you want to override the
* baseband filter selection, you must do so after setting the sample rate.
*/
int ADDCALL hackrf_set_sample_rate(hackrf_device* device, const double freq)
{
const int MAX_N = 32;