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AUDIOPERFORMANCEMEASURES Datasheet

  • AUDIOPERFORMANCEMEASURES

  • AUDIO PERFORMANCE MEASURES Soft Audio Solutions vs. PCI Anal...

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SigmaTel Inc
Integrating Mixed-Signal Solutions
Introduction
Product Brief
STAC9721 Host Audio
Performance Comparison
SigmaTel is pleased to report that its host based audio drivers perform as well as some of today鈥檚 best audio sound
cards. The SigmaTel line of AC鈥?7 codecs are unmatched in the market for overall audio performance, and this level of
performance can now be extended to SigmaTel鈥檚 soft audio drivers. Standard audio performance has been measured
using an Audio Precision tester. The results of those tests are included in this report. Additional data typical of PCI
sound card performance has also been included for comparison. For those measurements where PC99 minimum
performance standards apply, the PC99 limits have been included as well. In all cases, the SigmaTel host audio driver
performance greatly exceeds the minimum requirements of PC99.
LINE to LINE PERFORMANCE
The LINE to LINE performance tests are a measure of the overall quality of the codec input and output amplifiers, as
well as the mixer operation. The DAC and ADC are not operational during LINE to LINE operation. The host audio
LINE to LINE performance exceeds 100dB at nearly all input signal strengths.
LINE to LINE Comparison
120.00
100.00
80.00
Performance (dB)
60.00
40.00
20.00
0.00
Line-LineTHD+n-3db
Line-LineTHD+n0db
Line-LineXtalk0db
Line-LineSNROFF
Line-LineDR-60db
PCI
PC99 Limit
Host
STAC9721 Host Audio Performance Comparison Product Brief
Page - 1
2-PERFCOMP-P1-1.0-1099
10/06/99

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