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Discussion Groups | Piclist | I only want bass
A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.
I only want bass - mr_gees100_peas - Aug 28 16:46:02 2006
Hi,
I'm doing a project (hobby) which tries to detect the bass sound
from a music cd. Prety much what I want is to get a high signal
everytime the bass souns. Kind of showing the beat of themusic. Of
course I would like the logic high signal to stay on for the duration
of the Bass sound. What I have done so far is to connect an microphone
to an OPamp. This parts works fine. I can play a CD on the radio and I
see the signal on the oscilloscope. What I'l stuck at is filtering out
everything but the bass. I tried a low pass RC filter with a cut off
frequency from zero to 120Hz. This is attached at the output of the
OPamp. The results are not convincing. Any sugestions?
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Re: I only want bass - jrem - Aug 29 14:36:56 2006
why attach it to the OUTPUT of the opamp? I would attach it to the
input, then use feedback to attenuate the bass signal, and use the
opamp output to drive some logic level. Adjust the feedback on the
opamp for sensitivity.
--- mr_gees100_peas wrote:
> Hi,
>
> I'm doing a project (hobby) which tries to detect the bass sound
> from a music cd. Prety much what I want is to get a high signal
> everytime the bass souns. Kind of showing the beat of themusic. Of
> course I would like the logic high signal to stay on for the duration
> of the Bass sound. What I have done so far is to connect an
> microphone
> to an OPamp. This parts works fine. I can play a CD on the radio and
> I
> see the signal on the oscilloscope. What I'l stuck at is filtering
> out
> everything but the bass. I tried a low pass RC filter with a cut off
> frequency from zero to 120Hz. This is attached at the output of the
> OPamp. The results are not convincing. Any sugestions?
__________________________________________________
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input, then use feedback to attenuate the bass signal, and use the
opamp output to drive some logic level. Adjust the feedback on the
opamp for sensitivity.
--- mr_gees100_peas
> Hi,
>
> I'm doing a project (hobby) which tries to detect the bass sound
> from a music cd. Prety much what I want is to get a high signal
> everytime the bass souns. Kind of showing the beat of themusic. Of
> course I would like the logic high signal to stay on for the duration
> of the Bass sound. What I have done so far is to connect an
> microphone
> to an OPamp. This parts works fine. I can play a CD on the radio and
> I
> see the signal on the oscilloscope. What I'l stuck at is filtering
> out
> everything but the bass. I tried a low pass RC filter with a cut off
> frequency from zero to 120Hz. This is attached at the output of the
> OPamp. The results are not convincing. Any sugestions?
__________________________________________________
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Re: I only want bass - mr_gees100_peas - Aug 29 21:54:25 2006
--- In p...@yahoogroups.com, "mr_gees100_peas" wrote:
>
Thanks for all the replies. It seems that the consensus here is to use
the opamp as the filter. I'll give that a try this weekend. Thanks for
the help.
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>
Thanks for all the replies. It seems that the consensus here is to use
the opamp as the filter. I'll give that a try this weekend. Thanks for
the help.
to unsubscribe, go to http://www.yahoogroups.com and follow the instructions
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