UM1545 datasheet(27/64 Pages) STMICROELECTRONICS

27 / 64 page

UM1545

APW walkthrough

Doc ID 023225 Rev 1

27/64

Figure 25.

Generic processing block

Taking into account this kind of structure the Channel Controls allow the user to:

●

Select the processing channel

●

Select a specific filter among the ones available in the selected channel. Each button of

the row at the bottom of the controls corresponds to a filter. Moreover each button,

rather than indicating the biquad number, indicates the kind of filter in use according to

the following abbreviations:

–

P: peak filter

–

F: flat, all-pass

–

L: low-pass

–

H: high-pass

–

< : low-shelf

–

> : high-shelf

–

R: reserved (a biquad is reserved when it is used for an alternate function such as

a bass enhancement, de-emphasis filter, …)

●

Auto-align two or more processing channels. Two or more channels are aligned when

their biquadratic filters are configured in the same way. In other words, once a filter or a

set of filters has been defined for a processing channel, the Auto-Aligned Channels

option allows automatically applying the configuration to all the other linked channels,

thus speeding up the setup process. The only exception concerns the reserved

biquads. If a filter is reserved, its setting will not be applied to, or will not be changed

from, another linked filter. Please be aware that this is a software option offered by the

APW that is not related in any way to the physical implementation of the IC under test

(thus it is available for every device). Depending on the Sound Terminal® product,

similar options might be available also as hardware-implemented features that can be

managed through a dedicated set of device-specific controls.

The controls described above will necessarily vary according to the device architecture and

may slightly differ from those shown in Figure 24.

The center area of the lower part of this tab is occupied by the Equalization Presets (if

available for the selected device) and the Channel Controls described above.

Processing Channel 1

BIQ 1

BIQ 2

BIQ N

Processing Channel M

BIQ 1

BIQ 2

BIQ N

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