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a_d.h

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00001 // 
00002 // Copyright(c) 1993-1996 Tony Kirke
00003 // author="Tony Kirke" *
00004 /*
00005  * SPUC - Signal processing using C++ - A DSP library
00006  * 
00007  * This program is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2, or (at your option)
00010  * any later version.
00011  * 
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  * 
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00020 */
00021 //
00022 #ifndef A_D
00023 #define A_D
00024 #include <math.h>
00025 #include <complex.h>
00026 namespace SPUC {//
00033 //
00034 //   Class for A/D conversion.
00035 //   Bit width is specified in constructor. Default is 8 bits.
00036 //   Handles real and complex samples
00037 // \image html a_d.gif
00038 // \image latex a_d.eps
00039 class a_d
00040 {
00041 protected:
00042         char size;              
00043         long max;
00044         long min;
00045 
00046         public:
00047         complex<long> sample(complex<double> x) {
00048                 return( complex<long>( sample(x.real()),sample(x.imag()) ) ); 
00049         }
00050 
00052         a_d(char h=8) : size(h) {   
00053                 max =  ((1<<(size-1)) - 1 );
00054                 min = ~max;
00055         }
00057         long sample(double x) {
00058                 long quant;
00059                 quant = (long)floor(x+0.5);
00060                 if (quant>max) quant = max;
00061                 if (quant<min) quant = min;
00062                 return(quant);
00063         } 
00064 };
00065 } // namespace SPUC 
00066 #endif

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