URL
https://opencores.org/ocsvn/sqmusic/sqmusic/trunk
Subversion Repositories sqmusic
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/sqmusic/trunk/memos/sintable.cc
File deleted
/sqmusic/trunk/sqm/sintable.cc
0,0 → 1,38
/* |
sintable: sine wave table generator |
Based on MAME's fm.c file. |
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(c) Jose Tejada Gomez, May 2013 |
You can use this file following the GNU GENERAL PUBLIC LICENSE version 3 |
Read the details of the license in: |
http://www.gnu.org/licenses/gpl.txt |
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Send comments to: jose.tejada at ieee.org |
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*/ |
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#include <iostream> |
#include <cmath> |
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using namespace std; |
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unsigned conv( double x ) { |
double xmax = 0xFFFFF; // 20 bits, all ones |
return (unsigned)(xmax* 20*log(x+0.5)); |
} |
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int main(void) { |
const double pi = 3.141592654; |
const double factor = pi / 1024; |
cout.setf( ios::hex, ios::basefield ); |
for(double i=0; i<1024; i++ ) { |
double sin_val = sin( (2*i+1)*factor ); |
double log_val = 8*log( 1/abs(sin_val) )/log(2); |
int rounded_val = log_val*2; |
rounded_val = rounded_val&1 ? (rounded_val>>1)+1 : rounded_val>>1; |
unsigned int sin_tab = (rounded_val<<1) + (sin_val>=0.0? 0: 1); |
cout << sin_val << " -> " << log_val << " dB2 " << " -> " |
<< rounded_val << " -> " << sin_tab << "\n"; |
} |
return 0; |
} |