mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-10-26 02:20:20 -04:00
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
|
// np_fwht.h
|
||
|
|
// Basic implementation of the Fast Walsh-Hadamard Transforms
|
||
|
|
//
|
||
|
|
// (c) 2016 - Nico Palermo, IV3NWV - Microtelecom Srl, Italy
|
||
|
|
// ------------------------------------------------------------------------------
|
||
|
|
// This file is part of the qracodes project, a Forward Error Control
|
||
|
|
// encoding/decoding package based on Q-ary RA (repeat and accumulate) LDPC codes.
|
||
|
|
//
|
||
|
|
// qracodes is free software: you can redistribute it and/or modify
|
||
|
|
// it under the terms of the GNU General Public License as published by
|
||
|
|
// the Free Software Foundation, either version 3 of the License, or
|
||
|
|
// (at your option) any later version.
|
||
|
|
// qracodes is distributed in the hope that it will be useful,
|
||
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
// GNU General Public License for more details.
|
||
|
|
|
||
|
|
// You should have received a copy of the GNU General Public License
|
||
|
|
// along with qracodes source distribution.
|
||
|
|
// If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
|
||
|
|
#ifndef _npfwht_h_
|
||
|
|
#define _npfwht_h_
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
void np_fwht(int nlogdim, float *dst, float *src);
|
||
|
|
// Compute the Walsh-Hadamard transform of the given data up to a
|
||
|
|
// 64-dimensional transform
|
||
|
|
//
|
||
|
|
// Input parameters:
|
||
|
|
// nlogdim: log2 of the transform size. Must be in the range [0..6]
|
||
|
|
// src : pointer to the input data buffer.
|
||
|
|
// dst : pointer to the output data buffer.
|
||
|
|
//
|
||
|
|
// src and dst must point to preallocated data buffers of size 2^nlogdim*sizeof(float)
|
||
|
|
// src and dst buffers can overlap
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif // _npfwht_
|