![]() ![]() (This includes audio produced by games, MP3 or WAV players, but also some software playing a CD-DA through the CPU, such as, Windows Media Player or Media Player Classic, as well as TV tuner cards that use the CPU for decoding audio.)Īudio signal generated by a synthesizer chip (often described as “MIDI device”) or digital signal processor on the sound card.Īudio signal received from the analog CD input of the mixer, which is usually connected to the analog audio output of a CD drive.Īudio signal received through one of the (typically two: MIC1 and MIC2, switchable) analog microphone inputs. Typical input channels and controls Įach of the following signal sources has its own gain and mute control in a typical mixer scheme:Īudio signal generated by the CPU via the sound card's digital-to-analog converter. A more accurate depiction of the mixing scheme used in AC'97 compatible sound cards can be seen in Figure 17 of the AC'97 spec.
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