如何用扬声器响应修正STA311b系统的相位？

我不确定你的坏相位图的根本原因，但它可能取决于整个系统架构（包括ADC和功率FET）。您可以尝试通过测量和使用STA311B嵌入式滤波阶段进行补偿来优化响应，但我会首先尝试了解您的错误响应的真正罪魁祸首。此外，STSpeakerTune威廉希尔官方网站 更多的是补偿频率响应，而不是相位 - 刚刚发布了关于该主题的新主题，突出了如何快速评估该功能。
 
 
 马尔科



以下为原文





I'm unsure about the root cause of your bad phase plot but it will arguably depends on the overall system architecture (including ADC and power FETs). You could try to optimized the response by measuring it and compensating with STA311B embedded filtering stages but I would first try to understand what's the real culprit of your bad response. Also, STSpeakerTune technology is more to compensate the frequency response, not the phase - a new topic on this subject has just been posted highlighting how to quickly assess the feature.


Marco

你好马可，
 
 
 非常感谢您的快速回复。所以我测量了adc和sta311b之上的阶段。 adc（来自ti的pcm4202）具有非常低的相变，几乎为零。我从其他项目中了解到这一点。
 
 胎儿阶段和lc过滤器的相位响应最大为8°。所以没关系。
 
 现在我的rohde＆amp; schwarz upl系统有一些截图：
 
 第一：STA311b绕过dsp，输入驱动96kHz 24bit I2S 256fs
http://www.mikrocontroller.net/attachment/238173/Phase_AnalogIn-AMP_out.jpg
 
 第二：STA311b绕过dsp，输入驱动192kHz 24bit I2S 128fs
http://www.mikrocontroller.net/attachment/238180/Phase_192khz.jpg
 
 
 在192kHz模式下，sta311上的相位看起来要好得多，但仍然不是线性的。你有什么主意吗？你有劳动的阶段情节吗？
 
 谢谢，
 伯恩哈德



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Hello Marco,


thanks a lot for your fast reply. So I measured the phase just above the adc and sta311b. The adc (pcm4202 from ti) has a very low phase marging, nearly zero. I know it from other projects.  

The phase response over the fet stage and lc filter is 8° max. So that's ok.

Now some screenshots form my rohde&schwarz upl system:

First: STA311b with dsp bypassed, Input driven with 96kHz 24bit I2S 256fs
http://www.mikrocontroller.net/attachment/238173/Phase_AnalogIn-AMP_out.jpg

Second: STA311b with dsp bypassed, Input driven with 192kHz 24bit I2S 128fs
http://www.mikrocontroller.net/attachment/238180/Phase_192khz.jpg


In 192kHz mode the phase over the sta311 looks much better but still not linear. Do you have any idea? Do you have a phase plot from your labor?

Thanks,  
Bernhard

嗨马可，
 
 
 你能说一下我的相位图吗？你在实验室的sta311b上有相位图吗？
 
 问候
 伯恩哈德



以下为原文





Hi Marco,


can you say anything about my Phase plots? Do you have a Phase plot over the sta311b from your lab?

Regards
Bernhard

嗨伯恩哈德，
 
 STA311B的群延迟约为0.53mS @ 48Khz FS，因此如果增加采样频率，延迟将减小。
 谢谢



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Hi Bernhard ,

the group delay of STA311B is around 0.53mS @ 48Khz FS , so if you increaed sample frequency , the delay will be reduced .
Thanks

嗨赵，
 
 
 群延迟应该对相位延迟没有影响...你看过我在上一篇文章中添加的屏幕了吗？您可以看到高相位延迟，是的，采样率越高，延迟越好，但即使使用192kHz也不能接受。
 
 你能在实验室制作相位图吗？
 
 再次感谢
 伯恩哈德



以下为原文





Hi Zhao,


Group delay should have no influence to the phase delay... Have you looked at the screens I added in my previous post? You can see a high phase delay and yes the delay gets better with higher sampling rate but still not acceptable even with 192kHz.

Can you make a phase plot in your lab?

Thanks again
Bernhard

嗨bernhard，
 
 plesae在附件中找到相移图。
 如果x aixs已被线性分割，你可以发现相移周期是固定的，测量一个恒定的延迟时间导致这种移位。
 
 谢谢



以下为原文





hi bernhard,

plesae find phase shift plot in attachment.
if the x aixs had been divieded in linear, you can find the phase shift period was fixed , measns a constant delay timing caused this shift.

Thanks