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Quasi-analog signal

In telecommunication, a quasi-analog signal is a digital signal that has been converted to a form suitable for transmission over a specified analog channel.

Note: The specification of the analog channel should include frequency range[?], bandwidth, signal-to-noise ratio, and envelope delay distortion[?]. When quasi-analog form of signaling is used to convey message traffic over dial-up telephone systems, it is often referred to as voice-data. A modem may be used for the conversion process.

Source: from Federal Standard 1037C and from MIL-STD-188

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