5 S=54272 10 FORL=STOS+24:POKEL,0:NEXT 15 POKES+22,128:POKES+21,0:POKES+23,1 20 POKES+5,9:POKES+6,0 30 POKES+24,79 40 READHF,LF,DR 50 IFHF<0THENEND 60 POKES+1,HF:POKES,LF 70 POKES+4,33 80 FORT=1TODR:NEXT 90 POKES+4,32:FORT=1TO50:NEXT 100 GOTO40 110 DATA25,177,250,28,214,250 120 DATA25,177,250,25,177,250 130 DATA25,177,125,28,214,125 140 DATA32,94,750,25,177,250 150 DATA28,214,250,19,63,250 160 DATA19,63,250,19,63,250 170 DATA21,154,63,24,63,63 180 DATA25,177,250,24,63,125 190 DATA19,63,250,-1,-1,-1
Try RUNning the program now. Notice the lower tones have had their volume cut down. It makes the overall quality of the note sound tinny. This is because you are using a high-pass filter which attenuates (cuts down the level of) frequencies below the specified cutoff frequency.
There are three types of filters in your Commodore computer's SID chip. We have been using the high-pass filter. It will pass all the frequencies at or above the cutoff, while attenuating the frequencies below the cutoff.
|This page has been created by Sami Rautiainen.|
|Read the small print.||Last updated February 10, 2002.|