SPICE audio tools

This repository has two programs for importing wav file to SPICE and exporting the output as a wav file.

This tool converts a wav file with a list of values, which can be read using ngspices file source. If wav file has multiple channels only the values of the first channel are returned.
Usage: python wavtospice.py
Ngspice must have been compiled with xspice support. File source can be used like follows:

a1 %v([in]) filesrc .model filesrc filesource (file="values" amploffset=[0] amplscale=[1]
- ```
                     timeoffset=0 timescale=1
```
- ```
                     timerelative=false amplstep=false)
```

See ngspice manual for possible options.

This tool converts ngspice output to wav file. Compatibility with other simulators is untested.
Use "wrdata" command in the spice netlist to save data to file. Run the ngspice in batch mode using the command line flag -b.
Usage: python spicetowav.py <SPICE output file> <Output wav> [clipping voltage]. Clipping voltage is optional and if it's unspecified wav is written with maximum amplitude such that clipping doesn't occur.

Example

Following commands can be used to get output from lowpass filter example file when run on Linux:

$ ./wavtospice.py file.wav inputvalues
$ ngspice -b examples/lowpass.cir
$ ./spicetowav.py output.data output.wav

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