ACS422A68TAGZBX8 IDT, ACS422A68TAGZBX8 Datasheet - Page 24

• Manufacturer Part Number: ACS422A68TAGZBX8
• Description: Interface - CODECs
• Manufacturer: IDT

Specifications of ACS422A68TAGZBX8

• Rohs: yes
• Part # Aliases: IDTACS422A68TAGZBX8

ACS422x68
LOW-POWER, HIGH-FIDELITY, INTEGRATED CODEC
©2011 INTEGRATED DEVICE TECHNOLOGY, INC.
3.7.2.
3.7.3.
Audio In
Controlling parameters
In order to control this processing, there are a number of configurable parameters. The parameters
and their ranges are:
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Overview
A basic block diagram of the compressor is shown below:
As this diagram shows, there are 3 primary components of the compressor.
1. Level Detector: The level detector, oddly enough, detects the level of the incoming signal.
2. Gain Calculation: The gain calculation block is responsible for taking the output of the level
Compressor/limiter
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Expander
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Two level detection algorithms
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Since the comp/limiter is designed to work on blocks of signals, the level detector will either find
the peak value of the block of samples to be processed or the rms level of the samples within a
block.
detector and calculating a target gain based on that level and the compressor and expander
Threshold – -40db to 0db relative to full scale.
Ratio – 1 to 20
Attack Time – typically 0 to 500ms
Release Time – typically 25ms to 2 seconds
Makeup gain – 0 to 40db
Threshold – -30 to -60 dB
Ratio – 1 to 6
Attack Time – same as above
Release Time – same as above.
RMS
Peak
Peak or RMS
Detector
Level
Figure 9. Compressor block diagram
Compare to Thresholds
Gain
Calc
Calc Gain
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Attack and release
Gains based on
release
Attack/
Lowpass filter
filter
Audio Out
ACS422X68
V1.6 01/13