DSP Signal Generator Implementation On C6713 DSK - ComLab

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previous input data is shifted once towards right (line 24). After segment extraction, sinusoidal wave with 0 o and 180 o phase are assigned for bits 0 and 1, respectively (line 17). As input sample is represented by 16 bits so every sampled data contains 16 segments and each symbol assigned to the segment is transmitted by a sinusoid generated by 4 points so the next input sample is obtained every 64 output samples of BPSK (line 10). Figure 3.27: BPSK obtained with the Scope 32
1 include "dsk6713_aic23.h" //support file for codec, DSK 2 Uint32 fs=DSK6713_AIC23_FREQ_96KHZ; //set sampling rate 3 #include //for performing modulation operation 4 int i_BPSK_M, j_BPSK_M; 5 int masked_value, output; 6 //Data table for BPSK MOD 7 int data_BPSK[2][4]={0, 1000, 0, -1000, 0, -1000, 0, 1000}; 8 interrupt void c_int11() //interrupt service routine 9 { 10 if (i_BPSK_M==64) //determines when to get new input 11 { 12 sample_data = input_sample(); //inputs data 13 i_BPSK_M=0; 14 j_BPSK_M=0; 15 } 16 masked_value = sample_data & 0x0001; //masks input sample as 1-bit segments 17 output = data_BPSK[masked_value][j_BPSK_M]; //gets corresponding level from table 18 output_sample(output*10); //outputs corresponding sinusoid 19 j_BPSK_M++; //repeated output counter 20 21 if (j_BPSK_M==4) //checks if 1-bit segment was output 22 { 23 j_BPSK_M=0; 24 sample_data = sample_data >> 1; //shifts input so as to mask another part 25 } 26 i_BPSK_M++; 27 return; 28 } // end of interrpt routine 29 void main() 30 { 31 i_BPSK_M=64; 32 j_BPSK_M=0; 33 comm_intr(); //init DSK, codec, McBSP 34 while(1); //infinite loop Figure 3.28: BPSK source code [2] 33
Page 1 and 2: DSP Signal Generator Implementation
Page 3 and 4: Table of Contents Acknowledgements
Page 5 and 6: 1 Introduction Mostly sensors gener
Page 7 and 8: 1.1 Hardware and Software Tools Man
Page 9 and 10: All the necessary files and steps r
Page 11 and 12: Figure 1.5: Digital based Function
Page 13 and 14: designing, testing, troubleshooting
Page 15 and 16: other using slider “f1” and “
Page 17 and 18: Figure 3.1: Sine Wave obtained with
Page 19 and 20: y the user, correspondingly the fre
Page 21 and 22: In the main function, buffer of val
Page 23 and 24: 3.1.4 Sawtooth Wave (Ramp) Generati
Page 25 and 26: 3.1.5 Multi-tone Signal Generation
Page 27 and 28: Figure 3.14 shows the source code f
Page 29 and 30: Figure 3.17 shows pseudorandom nois
Page 31 and 32: Figure 3.20: A simple PAM system bl
Page 33 and 34: Figure 3.23: 4-level PAM obtained w
Page 35: Figure 3.26 shows the output of DSK
Page 39 and 40: Figure 3.30: QPSK obtained with the
Page 41 and 42: 4 Conclusion and Future Work Flexib
Page 43 and 44: Mode 4: Saw-tooth Wave Gain Frequen
Page 45: [12] Wikipedia website, URL: http:/

DSP Signal Generator Implementation On C6713 DSK - ComLab

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