stac9721 host audio performance comparison product brief 10/06/99 page - 1 product brief stac9721 host audio performance comparison introduction sigmatel is pleased to report that its host based audio drivers perform as well as some of today?s best audio sound cards. the sigmatel line of ac?97 codecs are unmatched in the market for overall audio performance, and this level of performance can now be extended to sigmatel?s 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. sigmatel inc integrating mixed-signal solutions 0.00 20.00 40.00 60.00 80.00 100.00 120.00 performance (db) line-linethd+n0db line-linethd+n-3db line-linedr-60db line-linesnroff line-linextalk0db line to line comparison pci pc99 limit host
stac9721 host audio performance comparison product brief 10/06/99 page - 2 dac playback performance the dac playback performance tests are a measure of the overall quality of the codec dac and output amplifiers, as well as the mixer operation. the adc is not operational during dac playback operation. both the 48khz and 44.1khz host audio playback rates exhibit exceptional performance, well in excess of competitive solutions and the pc99 minimum requirements. 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00 performance (db) dac 48thd+n0db dac 48thd+n-3db dac 48dr-60db dac 48snroff dac 48xtalk0db dac 44.1thd+n0db dac 44.1thd+n-3db dac 44.1dr-60db dac 44.1snroff dac 44.1xtalk0db dac playback comparison pci pc99 limit host
stac9721 host audio performance comparison product brief 10/06/99 page - 3 adc record performance the adc record performance tests are a measure of the overall quality of the codec adc and input amplifiers/multiplexer. the dac is not operational during adc record operation. both the 48khz and 44.1khz host audio record sample rates exhibit exceptional performance equal or better than high-performance pci sound cards. the sigmatel codec plus driver combination delivers audio quality well in excess of competitive solutions and the pc99 minimum requirements. 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 performance (db) adc 48thd+n-3db adc 48dr-60db adc 48snroff adc 48xtalk0db adc 44.1thd+n-3db adc 44.1dr-60db adc 44.1snroff adc 44.1xtalk0db adc record comparison pci pc99 limit host
stac9721 host audio performance comparison product brief 10/06/99 page - 4 microphone performance the microphone performance tests are a measure of the overall quality of the codec adc, microphone input amplifiers and multiplexer. the dac is not operational during microphone operation. both the 48khz and 44.1khz host audio record sample rates exhibit exceptional performance, well in excess of competitive solutions and the pc99 minimum requirements. 0.00 20.00 40.00 60.00 80.00 100.00 120.00 performance (db) micthd+n-20db micthd+n0db micthd+n-3db micdr-60db micsnroff microphone comparison pci pc99 limit host
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