;Written by Iain McCurdy, 2006 -odevaudio -b400 sr = 44100 ;SAMPLE RATE ksmps = 2 ;NUMBER OF AUDIO SAMPLES IN EACH CONTROL CYCLE nchnls = 2 ;NUMBER OF CHANNELS (2=STEREO) ;FLTK INTERFACE CODE;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; FLcolor 255, 255, 255, 0, 0, 0 ; LABEL | WIDTH | HEIGHT | X | Y FLpanel "butterhp/buthp", 500, 150, 0, 0 ;SWITCHES ON | OFF | TYPE | WIDTH | HEIGHT | X | Y | OPCODE | INS | STARTTIM | IDUR gkOnOff,ihOnOff FLbutton "On/Off", 1, 0, 22, 140, 25, 5, 5, 0, 1, 0, -1 FLsetColor2 255, 255, 50, ihOnOff ;SET SECONDARY COLOUR TO YELLOW ;VALUE DISPLAY BOXES LABEL | WIDTH | HEIGHT | X | Y idfreq FLvalue " ", 70, 20, 0, 75 idgain FLvalue " ", 70, 20, 5, 125 ;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, 25, 345, 5, -1 ;SLIDERS MIN | MAX | EXP | TYPE | DISP | WIDTH | HEIGHT | X | Y gkfreq,ihfreq FLslider "Filter Cutoff", 20, 20000, -1, 23, idfreq, 490, 25, 5, 50 gkgain, ihgain FLslider "Output Amplitude Scaling", 0, 2, 0, 23, idgain, 490, 25, 5, 100 ;SET INITIAL VALUES OF FLTK VALUATORS ; VALUE | HANDLE FLsetVal_i 20, ihfreq FLsetVal_i 1, ihgain FLpanel_end ;INSTRUCTIONS AND INFO PANEL FLpanel " ", 500, 280, 512, 0 ;TEXT BOXES TYPE | FONT | SIZE | WIDTH | HEIGHT | X | Y ih FLbox " butterhp/buthp ", 1, 5, 14, 490, 15, 5, 0 ih FLbox "-------------------------------------------------------------", 1, 5, 14, 490, 15, 5, 20 ih FLbox "butterhp/buthp is an implementation of a second-order IIR ", 1, 5, 14, 490, 15, 5, 40 ih FLbox "Butterworth high-pass filter. Its input arguments are for ", 1, 5, 14, 490, 15, 5, 60 ih FLbox "filter cutoff frequency (in hertz) and an optional 2-way ", 1, 5, 14, 490, 15, 5, 80 ih FLbox "switch (default=0) to select whether the data space for ", 1, 5, 14, 490, 15, 5, 100 ih FLbox "feedback within the filter is initially cleared or allowed ", 1, 5, 14, 490, 15, 5, 120 ih FLbox "to retain previously held information. ", 1, 5, 14, 490, 15, 5, 140 ih FLbox "butterhp/buthp are slower than the original filters in Csound", 1, 5, 14, 490, 15, 5, 160 ih FLbox "but provide an almost flat passband and very good precision ", 1, 5, 14, 490, 15, 5, 180 ih FLbox "and stopband attenuation ", 1, 5, 14, 490, 15, 5, 200 ih FLbox "Multiple iterations of the butterhp/buthp opcode applied to ", 1, 5, 14, 490, 15, 5, 220 ih FLbox "the signal path in series can be used to create a sharper ", 1, 5, 14, 490, 15, 5, 240 ih FLbox "cutoff slope. ", 1, 5, 14, 490, 15, 5, 260 FLpanel_end FLrun ;RUN THE FLTK WIDGET THREAD ;END OF FLTK INTERFACE CODE;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; instr 1 if gkOnOff=0 then ;IF On/Off SWITCH IS SET TO 'OFF'... turnoff ;TURN THIS INSTRUMENT OFF endif ;END OF CONDITIONAL BRANCHING kporttime linseg 0,0.001,0.005,1,0.005 ;CREATE A VARIABLE FUNCTION THAT RAPIDLY RAMPS UP TO A SET VALUE kfreq portk gkfreq, kporttime ;SMOOTH MOVEMENT OF SLIDER VARIABLE ;OUTPUTS OPCODE FILE | SPEED | INSKIP | LOOPING (0=OFF 1=ON) asigL, asigR diskin2 "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) if kSwitch=1 then ;IF I-RATE VARIABLE CHANGE TRIGGER IS '1'... reinit START ;BEGIN A REINITIALISATION PASS FROM LABEL 'START' endif START: aresL buthp asigL, kfreq, i(gkskip) ;FILTER EACH CHANNEL SEPARATELY aresR buthp asigR, kfreq, i(gkskip) ;FILTER EACH CHANNEL SEPARATELY rireturn ;RETURN FROM REINITIALISATION PASS TO PERFORMANCE TIME PASSES outs aresL * gkgain, aresR * gkgain ;SEND FILTER OUTPUT TO THE AUDIO OUTPUTS, RESCALE USING SLIDER VARIABLE gkgain endin f 0 3600 ;DUMMY SCORE EVENT ALLOWS REAL-TIME PERFORMANCE FOR 1 HOUR