Wave and MIDI filters have their own topologies. Although the topology filter contains key topological features, it does not necessarily contain the adapter's entire topology. In spite of its name, a topology filter is only one of several types of audio filter that expose their internal topology or layout. The term "topology filter" is in one sense a misnomer. A topology filter's bridge pins might also represent analog linein and lineout jacks, and possibly even digital input and output connectors. These connections typically carry analog output signals that drive speakers and analog input signals from microphones. This circuitry does mixing of rendering streams and multiplexing of capture streams.Ī topology filter provides the bridge pins (see Audio Filter Graphs) that represent the audio adapter's physical connections to external devices. A topology filter represents the portion of the circuitry on an audio adapter card that handles interactions among the various wave and MIDI streams that are managed on the card.
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