Yet another BBD question...

[Harry Bissell]

OK I'll get it

its Bucket Brigade Device (or delay...). The idea is a long string of analog
sample and hold circuits. There is a high frequency (dual phase like Q and not
Q) clock, which causes the charges to be passed to the next stage in
succession...

like firemen passing buckets of water to the next guy in line... there is a
continuous stream of water being delivered to the output, delayed by the time
it took to pass the buckets through  (oh...) 512 men...

Now picture that each bucket is filled with a different amount of water
(corresponding to the input (audio) voltage at the time it was filled. Then at
the other end the bucket is emptied and the (audio) voltage is recovered...

Plus some slop, and noise, and limited range (you can't make the buckets too
empty or nothing comes out, or too full, they overflow and never reach the
fire...) and there is the noise of the clock bleeding through to be filtered
out....

which IMHO makes BBDs SUCK

opinion for comparison purposes only
actual mileage may vary...

H^)   (harry)

"Brousseau, Paul E (Paul)" wrote:

> Er, what is BBD?  My understanding is that it stands for bit-bucket brigade
> delay, but I don't remember where or how I got that idea.  I may have made
> it up.  So what is it, and what's the basic concept?  (After the basic
> concept is laid out and I've had time to scratch my head, there will surely
> be more questions...)
>
> --PBr