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increased guard interval to 1/4

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to reduce ISI and support sample rates 11025 Hz and 22050 Hz
This commit is contained in:
Ahmet Inan 2021-07-27 13:14:00 +02:00
commit 7c7ed0ffd7
2 changed files with 14 additions and 2 deletions
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8
decode.cc
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@ -159,7 +159,7 @@ struct Decoder
typedef DSP::Const<value> Const;
static const int symbol_len = (1280 * rate) / 8000;
static const int filter_len = (((21 * rate) / 8000) & ~3) | 1;
static const int guard_len = symbol_len / 8;
static const int guard_len = symbol_len / 4;
static const int ldpc_bits = 64800;
static const int bch_bits = ldpc_bits - 21600;
static const int data_bits = bch_bits - 10 * 16;
@ -529,9 +529,15 @@ int main(int argc, char **argv)
case 8000:
delete new Decoder<value, cmplx, 8000>(output_data, &input_file, skip_count);
break;
case 11025:
delete new Decoder<value, cmplx, 11025>(output_data, &input_file, skip_count);
break;
case 16000:
delete new Decoder<value, cmplx, 16000>(output_data, &input_file, skip_count);
break;
case 22050:
delete new Decoder<value, cmplx, 22050>(output_data, &input_file, skip_count);
break;
case 44100:
delete new Decoder<value, cmplx, 44100>(output_data, &input_file, skip_count);
break;