Audio Engineering

798 Chapter 27

27.8.4 Digital Mixer Architecture

Because of the incredible fl exibility and “ programmability ” of digital signal processing-
based mixers, architecture is much harder (less necessary!) to defi ne. This, alone, is a
great advantage. For instance, digital processing too has blurred the traditional distinction
between split and in-line consoles because, with the aid of confi gurable signal paths and
motorized faders, the same small group of faders can be used to “ fl ip ” between the role of
the recording mixer and that of the playback mixer.

Box 27.1 Fact Sheet #12: Digital signal processing

● Architecture of DSP devices

● Convolution

● Impulse response

● FIR and IIR digital fi lters

● Design of digital fi lters

● Frequency response

● Derivation of band-pass and high-pass fi lters

● Digital frequency domain analysis—the z-transform

● Problems with digital signal processing

X X

Σ

X

Input t t

Step-function

Output

t

1/4

1/2

1/4

1/4 1/2 1/4

Figure 27.26 : Principle of a digital fi lter.