Re: VU meters on LCD
- From: CBFalconer <cbfalconer@xxxxxxxxx>
- Date: Thu, 26 Jan 2006 03:19:54 -0500
cbarn24050@xxxxxxx wrote:
> Richard Sloan wrote:
>
.... snip ...
>>
>> Now the issue is the bars and very jumpy, either showing a couple
>> or all of them....
>>
>> I sample the audio every 1/10s and display the bars, I can sample
>> more, but refreshing the display at a high rate is hard due to
>> the fact I need to keep streaming MP3 data and can not miss any.
>>
.... snip ...
>>
>> Any thoughts?
>
> I agree with Hans, you need to do some signal conditioning before
> you sample. Try searching for audio circuits you should find
> something somewhere.
All he needs is a digital filter. A moving average will require
some storage for the sampling period. However the equivalent of a
RC filter will only require one value.
value = (value + sample) / 2.0
for example. Changing the weighting of value and sample will
change the time constant.
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- From: Richard Sloan
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- From: cbarn24050
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