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25 lines
792 B
Markdown
25 lines
792 B
Markdown
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# About
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This is a manual test, and demo application for DAC DDS.
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# Usage
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This application will initialize the single default DAC DDS channel, and play
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sine, square, sawtooth waves or a greeting audio on it as requested on the command line.
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Typical usage:
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> hello
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> sine 440 2
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# Audio source and license
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hello.raw is an audio rendition of ESpeak saying "hello world". It was obtained
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from <https://commons.wikimedia.org/wiki/File:Hello_world_said_by_eSpeakNG.ogg>
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where it is annotated to be licensed under CC-BY-SA 4.0 international.
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It was converted and trimmed using:
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$ fmpeg -i Hello_world_said_by_eSpeakNG.ogg -ar 8000 -f u8 -c:a pcm_u8 hello.raw
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$ python3 -c "s = open('hello.raw', 'rb').read(); s = s.strip(b'\x80') + b'\x80'; open('hello.raw', 'wb').write(s)"
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