Delay: Difference between revisions
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There are two common types of delay found as modules: |
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*Analogue BBDs |
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*Digital Delays |
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BBD stands for Bucket Brigade Delay. A bucket brigade or bucket-brigade device is a discrete-time analogue delay line, developed in 1969 by F. Sangster and K. Teer of the Philips Research Labs. It consists of a series of capacitance sections C0 to Cn. The stored analogue signal is moved along the line of capacitors, one step at each clock cycle. |
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The name derives from a line of people passing buckets of water along the line. |
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A well-known integrated circuit device around 1980, the Reticon SAD-1024 implemented two 512-stage analog delay lines in a 16-pin DIP. It allowed clock frequencies ranging from 1.5 kHz to more than 1.5 MHz. The SAD-512 was a single delay line version. The TDA1022 similarly offered a 512-stage delay line but with a clock rate range of 5-500 kHz. Other common BBD chips include the MN3005, MN3007 and MN3205, with the primary differences being the available delay time. |
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By 2009, the guitar effects pedal manufacturer Visual Sounds recommissioned production of the Panasonic-designed MN3102 and MN3207 BBD chip that it offers for sale. |
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Despite being analog in their representation of individual signal voltage samples, these devices are discrete in the time domain and thus are limited by the Nyquist–Shannon sampling theorem; both the input and output signals are generally low-pass filtered. The input must be low-pass filtered to avoid aliasing effects, while the output is low-pass filtered for reconstruction. (A low-pass is used as an approximation to the Whittaker–Shannon interpolation formula.) |
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<small>(''Excerpt from [http://en.wikipedia.org/wiki/Bucket-brigade_device this Wikipedia page])''.</small> |
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Feel free to add to this list. See also: [[Modules by function | Modules by Function]] |
Feel free to add to this list. See also: [[Modules by function | Modules by Function]] |
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