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receiver/time_sample_ref: improve accuracy of offset<->time conversions 

Change-Id: Ie6e7ea4337c9e23a8e4445136a3adffc96b19942
This commit is contained in:
Piotr Krysik 2018-11-02 11:52:43 +01:00
parent 89dc99016e
commit 554aa905e4
1 changed files with 3 additions and 6 deletions
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9
lib/receiver/time_sample_ref.cc
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@ -42,17 +42,14 @@ namespace gr {
time_spec_t time_sample_ref::offset_to_time(uint64_t offset)
{
uint64_t samples_from_last_rx_time = offset - d_current_start_offset;
time_spec_t time = time_spec_t(static_cast<double>(samples_from_last_rx_time)/d_samp_rate) + d_last_rx_time;
time_spec_t time = time_spec_t::from_ticks(samples_from_last_rx_time, d_samp_rate) + d_last_rx_time;
return time;
}
uint64_t time_sample_ref::time_to_offset(time_spec_t time)
{
double samples_since_last_rx_time_tag = (time-d_last_rx_time).get_real_secs()*d_samp_rate;
// double fractional_part = round(samples_since_last_rx_time_tag) - samples_since_last_rx_time_tag;
uint64_t offset = static_cast<uint64_t>(round(samples_since_last_rx_time_tag)) + d_current_start_offset;
uint64_t samples_since_last_rx_time_tag = (time-d_last_rx_time).to_ticks(d_samp_rate);
uint64_t offset = samples_since_last_rx_time_tag + d_current_start_offset;
return offset;
}
} // namespace gsm