Importance

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Abstract

Timing characteristics of message-oriented transports are measured using common personal computers which easily support a wide variety of analytical tools. The apparatus measures timing characteristics of bursty message traffic over relatively low-speed digital transports such as the Musical Instrument Digital Interface (MIDI). The apparatus includes means for generating a reference pulse stream, such as a sequencer. A transcoder device receives the reference pulse stream and routes the pulse stream to a device under test and, in analog form, to a first channel input of a digital recording device, such as a sound card installed in a personal computer. The transcoder also receives an output pulse stream from the device under test and routes the output pulse stream, in analog form, to a second channel input of the digital recording device. A differential technique allows timing errors in the reference pulse stream to be eliminated from measurements. The apparatus can also be used for measuring propagation characteristics of a particular transmission medium.

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First Claim