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LM49352 数据表(PDF) 75 Page - Texas Instruments

部件名 LM49352
功能描述  Boomer Mono Class D Audio Codec Subsystem with Ground Referenced Headphone Amplifiers, Earpiece Driver, and Audio DSP
PDF  106 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM49352 数据表(HTML) 75 Page - Texas Instruments

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Audio
Compressor
Output Level
(dB)
Audio Compressor Input
Level
(dB)
Audio
Compressor
Threshold
Level
1:2 Compression
Ratio
1:215
Compression
Ratio
1:4 Compression
Ratio
1:1 Compression
Ratio
LM49352
www.ti.com
SNAS467E – MARCH 2009 – REVISED MARCH 2013
Digital Audio Compressor
The LM49352 features a digital audio compressor on both the DAC and ADC paths. The compressor works by
reducing the level of the audio signal that is higher than the level set by the audio compressor threshold level
(THRESHOLD) by a fixed ratio (compressor output / compressor input) that is set by a predetermined audio
compression ratio (RATIO). Higher compression ratios result in more compression as shown in Figure 70. The
audio compressor can be used in conjunction with the ALC to limit audio peaks that the ALC may not be fast
enough to react to.
Figure 70. Audio Compressor Effect
Soft Knee Function
The LM49352’s audio compressor also features a soft knee function that smooths the harsh edges found during
clipping of an audio signal. For audio signals higher than the compressor threshold level, the soft knee function
gradually increases the compression ratio for increasing levels of audio signal beyond the compressor threshold.
To achieve the smoothing effect to prevent hard clipping, the soft knee function initially compresses the audio
signal at the smallest ratio and then incrementally increases the compression ratio if required. The highest level
of compression applied by the soft knee function is set by the compressor ratio. The effect of the soft knee
function is shown in Figure 71.
Copyright © 2009–2013, Texas Instruments Incorporated
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