Examples for wav audio simulation.
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Holger Vogt
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README.examples, slightly adapted to the new ngspice wav capability,
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taken from http://gareus.org/oss/spicesound/examples
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Simulation either as batch mode
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ngspice -b xxx.cir
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or in control mode
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ngspice xxx.cir
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output of jimi_fuzz-snd.cir, ready to compare
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git-fuzz64.mp3
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git-fuzz64.wav
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input for jimi_fuzz-snd.cir
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gits.wav
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circuit of fuzzer in jimi_fuzz-snd.cir
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jhfface.pdf
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just a simulation file of the fuzzer circuit
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jimi_fuzz.cir
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guitar input, fuzzified output on the left,
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original on the right channel
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jimi_fuzz-snd.cir
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bandpass RC filter, input sweep_sin20_20k_5s48k.wav
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rcfilter.cir
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just a simulation file for the RC filter
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rcsim.cir
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wav simulation input (gits.wav) is output
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sndtst.cir
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input to rcfilter.cir
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sweep_sin20_20k_5s48k.wav
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This branch, based on ngspice-32+ from pre-master branch on 25.07.2020,
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contains functions to read, simulate and output wav audio files.
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The origin of the code stems from
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http://gareus.org/oss/spicesound/start
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http://gareus.org/oss/spicesound/examples
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mady by Robin Gareus, enhanced by Hannu Vuolasaho at
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https://sourceforge.net/p/ngspice/patches/13/
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It uses the external libraries libsndfile and libsamplerate-0.1.9.
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The current setup has been tested only with MSVC 2019 on Windows 10.
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libsndfile has been downloaded from http://www.mega-nerd.com/libsndfile/ as
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http://www.mega-nerd.com/libsndfile/files/libsndfile-1.0.28-w64-setup.exe
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libsamplerate-0.1.9 has been downloaded from http://www.mega-nerd.com/SRC/download.html as
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http://www.mega-nerd.com/SRC/libsamplerate-0.1.9.tar.gz, and compiled
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with mingw gcc 10.2 for 64 bit Windows 10. libsamplerate.lib has been created
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from libsamplerate.def by command
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lib /def:libsamplerate-0.def /out:libsamplerate-0.lib /machine:x64
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in the Visual Studio 2019 Developer Command Prompt.
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The usage is described in
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http://gareus.org/oss/spicesound/start
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A complete package for Windows will be made available from the ngspice web pages.
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Test on Linux and macOS will follow.
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* jimi hendrix fuzz face - by J. Dunlop
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*
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* this netlist does not model the power-supply
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* as in the original device. a zener and cap
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* were left out next to the "battery".
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*
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* input : V2 - pin 10
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* output: R50/51 - pin 9
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*
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* Pots:
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* R50+R51 = 500k [Vol]
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* R100+R101 = 1k [Fuzz]
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*
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*----------------------------------------------
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* SPICE 3 - NETLIST
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.options
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*------------- Models -------------------------
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.model NPN NPN(Is=1.0e-16)
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*----------------------------------------------
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V_V2 10 0 dc 0.0 file(gits.wav) snd(0 0 0.5 0 0 32)
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R_R50 9 0 200k
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R_R51 3 9 300k
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R_R100 6 5 100
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R_R101 5 0 900
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R_R4 1 8 43k
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R_R6 4 11 10k
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C_C4 4 3 0.01u IC=0
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C_C6 5 0 1u
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Q_Q2 11 8 6 NPN
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R_R5 1 4 330
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Q_Q1 8 7 0 NPN
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C_C3 7 6 47p IC=0
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R_R3 7 6 68k
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C_C2 7 0 1n IC=0
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C_C1 2 10 2.2u
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R_R1 10 0 180k
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R_R2 2 7 100
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V_V1 1 0 dc 9.0
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*----------------------------------------------
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*.sndparam /tmp/melon-fuzz8.wav 48000 wav32 1.0 0.0
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**.sndparam git-fuzz9.wav 48000 wav32 3.5 0.0 2
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**.sndprint tran v(10) v(9)
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*.tran 2.0833333333333e-05 5.0 0 2.0833333333333e-05
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*.tran 1.3020833e-06 25.0 0 1.3020833e-06
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*.tran 1.3020833e-06 7.5 0 1.3020833e-06
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*.tran 2.6041666e-06 2.0 0 2.6041666e-06
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* /16
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*.tran 1.3020833e-06 3.0 0.1 1.3020833e-06
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.tran 6.5104166e-07 3.0 0.1 6.5104166e-07
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*.tran 3.25520833e-07 3.0 0 3.25520833e-07
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*.tran 1.627604166e-07 3.0 0 1.627604166e-07
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*.tran 8.138020833e-08 0.5 0 8.138020833e-08
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*.tran 4.069010416e-08 0.5 0 4.069010416e-08
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.op
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.control
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if $?batchmode
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else
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save v(10) v(9)
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sndparam $inputdir/git-fuzz9.wav 48000 wav32 3.5 0.0 2
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tran 6.5104166e-07 3.0 0.1 6.5104166e-07
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* tran 1.3020833e-06 3.0 0.1 1.3020833e-06
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* tran 2.0833333333333e-05 5.0 0 2.0833333333333e-05
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rusage
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sndprint v(10) v(9)
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rusage time
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end
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.endc
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.END
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* jimi hendrix fuzz face - by J. Dunlop
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*
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* this netlist does not model the power-supply
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* as in the original device. a zener and cap
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* were left out next to the "battery".
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*
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* input : V2 - pin 10
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* output: R50/51 - pin 9
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*
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* Pots:
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* R50+R51 = 500k [Vol]
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* R100+R101 = 1k [Fuzz]
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*
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*----------------------------------------------
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* SPICE 3 - NETLIST
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.options
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*------------- Models -------------------------
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.model NPN NPN(Is=1.0e-16)
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*----------------------------------------------
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V_V2 10 0 dc 0.0 sine(0.0 0.3 440.0 0 0)
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R_R50 9 0 400k
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R_R51 3 9 100k
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R_R100 6 5 950
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R_R101 5 0 50
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R_R4 1 8 43k
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R_R6 4 11 10k
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C_C4 4 3 0.01u IC=0
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C_C6 5 0 1u
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Q_Q2 11 8 6 NPN
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R_R5 1 4 330
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Q_Q1 8 7 0 NPN
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C_C3 7 6 47p IC=0
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R_R3 7 6 68k
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C_C2 7 0 1n IC=0
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C_C1 2 10 2.2u
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R_R1 10 0 180k
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R_R2 2 7 100
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V_V1 1 0 dc 9.0
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*----------------------------------------------
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.print tran v(10) v(9)
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.tran 2.0833333333333e-05 5.0 0 2.0833333333333e-05
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.op
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.END
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This is not a wave file.
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It is a test vehicle.
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capacitive bandpass filter
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v1 1 0 file ..\exampleswav\sweep_sin20_20k_5s48k.wav snd(0 0 1.0 0 0 1.0)
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r1 1 2 200
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c1 2 0 5u
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c2 2 33 1u
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rload 33 0 1k
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B3 3 0 v = v(33) * 3
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.sndparam ..\exampleswav\test-filter.wav 48000 wav24 1.0 0.0 1.0
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.sndprint tran v(1) v(3)
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.tran 2.08333e-05 5.0 0 2.08333e-05
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.op
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.control
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if $?batchmode
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else
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save v(1) v(3)
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sndparam ..\exampleswav\test-filter.wav 48000 wav24 1.0 0.0 1.0
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tran 2.08333e-05 5.0 0 2.08333e-05
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rusage
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sndprint v(1) v(3)
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rusage
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end
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.endc
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.end
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capacitive bandpass filter
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v1 1 0 dc 0 ac 1 ; sin
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r1 1 2 200
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c1 2 0 5u
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c2 2 3 1u
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rload 3 0 1k
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.ac lin 50 20 1000
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.plot ac v(3)
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.control
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run
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plot db(v(3)) xlog xlimit 10 1000
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.endc
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.end
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simple audio test
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V_V2 1 0 file ..\exampleswav\gits.wav snd 0 0 1.0 0 0 32
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R_R1 1 0 1M
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.sndparam ..\exampleswav\test-io.wav 48000 wav24 1.0 0.0 1.0
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.sndprint tran v(1)
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.tran 2.08333e-05 2.0 0 2.08333e-05
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.op
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.control
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if $?batchmode
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else
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sndparam ..\exampleswav\test-io.wav 48000 wav24 1.0 0.0 1.0
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tran 6.5104166e-07 3.0 0.1 6.5104166e-07
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rusage
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sndprint v(1)
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rusage
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end
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.endc
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.END
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