;Written by Iain McCurdy, 2006 -+rtaudio=PortAudio -b4096 sr = 44100 ;SAMPLE RATE kr = 441 ;CONTROL RATE ksmps = 100 ;NUMBER OF AUDIO SAMPLES IN EACH CONTROL CYCLE nchnls = 2 ;NUMBER OF CHANNELS (2=STEREO) ;FLTK INTERFACE CODE;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; LABEL | WIDTH | HEIGHT | X | Y FLpanel "butterbp/butbp", 500, 150, 0, 0 ;SWITCHES ON | OFF | TYPE | WIDTH | HEIGHT | X | Y | OPCODE | INS | STARTTIM | DUR gkOnOff,ihOnOff FLbutton "On/Off", 1, -1, 2, 150, 30, 0, 0, 0, 2, 0, -1 ;VALUE DISPLAY BOXES LABEL | WIDTH | HEIGHT | X | Y idfreq FLvalue " ", 100, 20, 0, 80 idband FLvalue " ", 100, 20, 0, 130 ;COUNTERS MIN | MAX | STEP1 | STEP2 | TYPE | WIDTH | HEIGHT | X | Y | OPCODE gkskip, ihskip FLcount "Initialisation 0-On 1-Off", 0, 1, 1, 1, 2, 150, 30, 350, 0, -1 ; MIN | MAX | EXP | TYPE | DISP | WIDTH | HEIGHT | X | Y gkfreq,ihfreq FLslider "Filter Cutoff", 20, 20000, -1, 5, idfreq, 500, 30, 0, 50 gkband,ihband FLslider "Bandwidth", 20, 10000, -1, 5, idband, 500, 30, 0, 100 ;SET INITIAL VALUES OF FLTK VALUATORS ; VALUE | HANDLE FLsetVal_i 900, ihfreq FLsetVal_i 10000, ihband FLsetVal_i -1, ihOnOff FLsetVal_i 0, ihskip FLpanel_end ;INSTRUCTIONS AND INFO PANEL FLpanel " ", 500, 320, 512, 0 ;TEXT BOXES TYPE | FONT | SIZE | WIDTH | HEIGHT | X | Y ih FLbox " butterbp/butbp ", 1, 5, 14, 490, 15, 5, 0 ih FLbox "-------------------------------------------------------------", 1, 5, 14, 490, 15, 5, 20 ih FLbox "Butterbp/butbp is an implementation of a second-order IIR ", 1, 5, 14, 490, 15, 5, 40 ih FLbox "Butterworth band-pass filter. Its input arguments are for ", 1, 5, 14, 490, 15, 5, 60 ih FLbox "filter cutoff frequency (in hertz), and bandwidth (also in ", 1, 5, 14, 490, 15, 5, 80 ih FLbox "hertz) of the spectral band that is allowed to pass through ", 1, 5, 14, 490, 15, 5, 100 ih FLbox "the filter. An optional 2-way switch (default=0) is provided ", 1, 5, 14, 490, 15, 5, 120 ih FLbox "to select whether the data space for feedback within the ", 1, 5, 14, 490, 15, 5, 140 ih FLbox "filter is initially cleared or allowed to retain previously ", 1, 5, 14, 490, 15, 5, 160 ih FLbox "held information. ", 1, 5, 14, 490, 15, 5, 180 ih FLbox "Butterbp/butbp is slower than the original filters in Csound ", 1, 5, 14, 490, 15, 5, 200 ih FLbox "but provides an almost flat passband (particularly when ", 1, 5, 14, 490, 15, 5, 220 ih FLbox "compared to the reson filter). ", 1, 5, 14, 490, 15, 5, 240 ih FLbox "Multiple iterations of the butterbp/butbp opcode applied to ", 1, 5, 14, 490, 15, 5, 260 ih FLbox "the signal path in series can be used to create a sharper ", 1, 5, 14, 490, 15, 5, 280 ih FLbox "cutoff slope. ", 1, 5, 14, 490, 15, 5, 300 FLpanel_end FLrun ;RUN THE FLTK WIDGET THREAD ;END OF FLTK INTERFACE CODE;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; instr 1 ;(ALWAYS ON - SEE SCORE) PLAYS FILE AND SENSES FADER MOVEMENT AND RESTARTS INSTR 2 FOR I-RATE CONTROLLERS ;OUTPUTS OPCODE FILE | SPEED | INSKIP | LOOPING (0=OFF 1=ON) gasigL, gasigR diskin "Seashore.wav", 1, 0, 1 ;GENERATE 2 AUDIO SIGNALS FROM A STEREO SOUND FILE (NOTE THE USE OF GLOBAL VARIABLES) kSwitch changed gkskip ;GENERATE A MOMENTARY '1' PULSE IN OUTPUT 'kSwitch' IF ANY OF THE SCANNED INPUT VARIABLES CHANGE. (OUTPUT 'kSwitch' IS NORMALLY ZERO) ; ITRIGGER | IMINTIM | IMAXNUM | IINSNUM | IWHEN | IDUR (-1 MEANS A NOTE OF INFINITE DURATION) schedkwhen kSwitch, 0, 0, 2, 0, -1 ;RESTART INSTRUMENT 2 WITH A SUSTAINED (HELD) NOTE WHENEVER kSwitch=1 endin instr 2 if gkOnOff!=-1 goto CONTINUE ;SENSE FLTK ON/OFF SWITCH turnoff ;TURN THIS INSTRUMENT OFF IMMEDIATELY CONTINUE: aresL butbp gasigL, gkfreq, gkband, i(gkskip) aresR butbp gasigR, gkfreq, gkband, i(gkskip) outs aresL, aresR ;SEND FILTER OUTPUT TO THE AUDIO OUTPUTS endin ;INSTR | START | DURATION i 1 0 3600 ;INSTRUMENT 1 PLAYS FOR 1 HOUR