upsamp — Modify a signal by up-sampling.
upsamp converts a control signal to an audio signal. It does it by simple repetition of the kval. upsamp is a slightly more efficient form of the assignment, asig = ksig.
Here is an example of the upsamp opcode. Play upsamp.csd
Example 1139. Example of the upsamp opcode.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -odac ;;;realtime audio out ;-iadc ;;;uncomment -iadc if RT audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o upsamp.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ;;with code from Steven Cook / David Akbari, Menno Knevel and Joachim Heintz sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 seed 0 opcode Decimator, a, akk ;UDO Sample rate / Bit depth reducer ;see http://www.csounds.com/udo/displayOpcode.php?opcode_id=73 setksmps 1 ain, kbit, ksrate xin kbits = 2^kbit ;bit depth (1 to 16) kfold = (sr/ksrate) ;sample rate kin downsamp ain ;convert to kr kin = (kin+0dbfs) ;add DC to avoid (-) kin = kin*(kbits/(0dbfs*2)) ;scale signal level kin = int(kin) ;quantise aout upsamp kin ;convert to sr aout = aout*(2/kbits)-0dbfs ;rescale and remove DC a0ut fold aout, kfold ;resample xout a0ut endop instr 1 ;avoid playing this too loud kbit = p4 ksr = 44100 asig diskin "fox.wav", 1 aout Decimator asig, kbit, ksr printks "bitrate = %d, ", 3, kbit printks "with samplerate = %d\\n", 3, ksr outs aout*.7, aout*.7 endin instr 2 ;moving randomly between different bit values (1 - 6) kbit randomi 1, 6, .5, 1 asig diskin "fox.wav", 1, 0, 1 ;loop play aout Decimator asig, kbit, 44100 printks "bitrate = %f\n", .3, kbit outs aout*.7, aout*.7 endin </CsInstruments> <CsScore> i 1 0 3 16 ;sounds allright but i 1 + 3 5 ;it's getting worse i 1 + 3 2 ;and worse... i 2 9 22 ;or quality moves randomly e </CsScore> </CsoundSynthesizer>