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Automated Wavetable Synthesizer Testing

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This paper describes an automated wavetable synthesizer testing system. Due to the nature of MIDI standards, testing of desired synthesizer behaviour or MIDI standard conformance is not feasible with bit-exact test vectors. Automated testing involves measuring the frequency, timing, and amplitude characteristics of the synthesizer output. Novel signal-analysis based testing methods were developed for measuring the rendering precision of MIDI and instrument articulation parameters. The automated test system consists of a PC host, which controls the test execution, stores the test case parameters, runs the signal analysis, and generates the test report. A modular interface connects the test system to the MIDI synthesizer allowing testing to be done on different hardware platforms using a single set of test cases. Currently, 62 different test groups for SP-MIDI, Mobile DLS and Mobile XMF standard conformance testing has been implemented.

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