[sdiy] adaptive filters?

David Moylan dave at westphila.net
Thu Jun 30 06:03:42 CEST 2011


Blacet Time Machine does this, switched-cap method.

On 6/29/11 7:40 PM, Paul Perry wrote:
> Yes, but I think the point in using a switch capacitor filter with a BBD
> is that you could synchronise the BBD clock and the filter clock (the
> filter clock would be a higher frequency, but the ratio would be
> constant, so you would use a divider.) using a straight voltage
> controlled filter, you would need a F to V converter (though only a
> simple one.)
>
> paul perry Melbourne Australia
>
> ----- Original Message ----- From: "Tom Wiltshire" .nl>
> Sent: Wednesday, June 29, 2011 6:54 AM
> Subject: Re: [sdiy] adaptive filters?
>
>
>> The SSM2044 datasheet suggests that it can be used as an adaptive
>> filter in a BBD delay line application!
>>
>> Seriously though, you could use any voltage-controlled filter,
>> couldn't you, as long as the parameter you're adapting to can also be
>> voltage controlled?
>>
>> T.
>>
>> On 28 Jun 2011, at 15:22, dan snazelle wrote:
>>
>>> Can anyone recommend info or schematics on how to construct an
>>> adaptive filter?
>>>
>>> I am wondering if you can do it without a switched cap filter?
>>>
>>> thanks for any help
>>>
>>>
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>>
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