Re: bucket brigade was Re: EH 16sec.DDL reissue?

[Matthias Grob <matthias@grob.org>]

>what is the name of the thread where you discuss the "bucket brigade" 
>chip?

I dont know...
The buckets are capacitors. At each clock, the charge of the previous 
is transfered to the next. The biggest chips had 4096 buckets and 
were made by Philips and Matsushita. The first ones appeared in the 
early 70ies. They were all noisy.

>this reading samples and endless memory thing is something that i have 
>been
>trying to get to for months.  the repeater "reads samples", right?

right

>and that, ultimately is why there is a pop at the loop point on a 
>looped sine, right?

it seems avoidable, but yes, its more likely to happen.

>finally seeing the light,
>lance



>  > - The speed/pitch variation as well discussed in other posts
>>  You dont need a Bucket-Brigade for that, as it works very similarely
>>  on the early digital delays which used pure HW AD and DA converters
>>  that can be clocked just like the Bucket-Brigade. Or do you hear a
>>  difference I am not aware of?
>>  The newer cheap and good converters (CODECs) all have an internal
>>  processor and thus cannot be clocked freely. So to reissue a unit
>>  that works like the old digital delays you woud have to use old,
>>  expensive, noisy, hard to find parts (I did not dig throug that chip
>>  market recently, so I may be wrong).
>>  We are aware that we should provide that in a future EDP kind of 
>product.
>>  In order not to turn the HW expensive, we should do it by software
>>  modeling. Since the EDP works with a endless memory and not by
>>  reading samples, it should not be too dificult. But I cannot promiss
>>  nothing here...
>>  I wonder whether Line6 tried and did not succeed or whether they did
>>  not think of it?
>>
>>  It becomes even more tricky if you want to module the mechanical
>  > characteristics of a tape echo speed control...

-- 


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