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| author | unknown <dm2515@eews303a-028.ic.ac.uk> | 2018-02-01 11:45:25 +0000 |
|---|---|---|
| committer | unknown <dm2515@eews303a-028.ic.ac.uk> | 2018-02-01 11:45:25 +0000 |
| commit | e6ef21c67becd2e136608957e6cbadc9bc5eed73 (patch) | |
| tree | 3233910f9f4539798210bb793b7d04b053d98d31 /lab4/RTDSP/intio.c | |
| parent | d15acaf23dcc779bd65b393ace28178bd8ac152d (diff) | |
| download | NoiseSilencer-e6ef21c67becd2e136608957e6cbadc9bc5eed73.tar.gz NoiseSilencer-e6ef21c67becd2e136608957e6cbadc9bc5eed73.zip | |
FInished lab4ex2
Diffstat (limited to 'lab4/RTDSP/intio.c')
| -rw-r--r-- | lab4/RTDSP/intio.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/lab4/RTDSP/intio.c b/lab4/RTDSP/intio.c index d7dceeb..5e0b11a 100644 --- a/lab4/RTDSP/intio.c +++ b/lab4/RTDSP/intio.c @@ -76,7 +76,7 @@ DSK6713_AIC23_CodecHandle H_Codec; void init_hardware(void); void init_HWI(void); void ISR_AIC(void); -short non_circ_fir(void); +short circ_fir(void); /********************************** Main routine ************************************/ void main(){ // initialize board and the audio port @@ -129,8 +129,8 @@ void ISR_AIC() short sample_in, sample_out; sample_in = mono_read_16Bit(); - buffer[ptr] = (float) sample_in / 32767.f; - sample_out = non_circ_fir(); + buffer[ptr] = (double) sample_in / 30000.0; + sample_out = circ_fir(); mono_write_16Bit(sample_out); if (ptr == 0) @@ -139,15 +139,12 @@ void ISR_AIC() } // Perform linear convolution -short non_circ_fir() +short circ_fir() { - double y = 0; - int M, i; - M = sizeof(b) / sizeof(b[0]); + int i; for(i = 0; i < N; i++) { - y += buffer[i] * b[M-i-1]; + y += buffer[(i+ptr)%N] * b[N-i-1]; } - return y*32767; + return y*30000; } - |