Ampt ANALOGER ADG-1 Benutzerhandbuch - Seite 4
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With a fixed clock frequency, they can only take a sample every 48 or
96KHz and step at that increment. They can only simulate fractional delay
and cannot do true fractional delay. The ear can perceive this and so it does
not feel right to the brain. Note early digital delays like the Lexicon PCM
41/42 did change the clock using different process, but these are the
exception not the rule. Most hybrid analog delays that use a MPU digital
clock do not use steps small enough for true fractional delay, so while they
may use a BBD the modulation does not sound as natural as some
picosecond step clocks or true analog modulation.
In addition, BBDs have some other "artifacts" that give them a unique
sound. The transfer characteristics, noise, distortion and frequency
response vary depending on the bias voltage and clock frequency making
the sound change as the delay time changes. They also do not put out the
entire signal at the same time. Half the signal is ½ clocks behind the rest of
the signal, yet combined at the same time, making for a strange time
domain merger and mixing of the signals slightly out of time.
Other components also affect the sound. The design of the companding and
emphasis/de-emphasis network (designed to improve the signal to noise
ratio) affects the animation, breathing, overshoot and tightness of the sound
like a compressor with a slow attack and fast release. The design of the
filters affects the frequency response, peaking or ringing, and potential
aliasing or ring modulation. There are many more parts of the analog
design often overlooked in digital recreations that affect the sound as well
including the clipping, feedback network, clock stability modulation wave
shaping/curves (exponential or linear, etc.) that are all important to get that
great analog delay sound.
For more reading about BBDs check out these great websites:
https://www.electrosmash.com/mn3007-bucket-brigade-devices
https://www.premierguitar.com/articles/25035-behind-the-bucket-brigade
https://pedals.thedelimagazine.com/bbd-chips-the-magic-behind-analog-
delay-pedals/
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