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Accelerometer eliminates foot pedals in guitar effects

Posted: 27 Apr 2006     Print Version  Bookmark and Share

Keywords:ADXL320  iMEMS accelerometer  Hot Hand  guitar effects  motion signal processing 

Analog Devices Inc.'s (ADI's) iMEMS motion signal processing technology, which is at the core of Source Audio's Hot Hand guitar effects controller, targets musicians looking for more control over their guitar effects. Incorporating ADI's ADXL320 iMEMS accelerometer, the effects controller attaches to a guitarist's picking hand. By sensing the musician's hand or finger motion, the product allows the guitarist to manipulate sound effects using an interface console that includes 11 "wah-wah" type filter effects.

"ADI's iMEMS accelerometer enabled a controller small enough to fit on a finger of a guitar player's picking hand," commented Roger Smith, president, Source Audio. "The whole idea of Hot Hand is to change the way guitarists manipulate effects without anchoring them to traditional pedal-effects consoles or other fixed on-stage devices."

At the core of the product's motion sensing system is ADI's dual-axis iMEMS accelerometer. The ADXL320 has a typical measurement range of ±5g and measures the motions generated by a guitar player's hand. Mounted in a ring on a user's strumming hand, the accelerometer's x- and y-axis analogue outputs provide measurements for both movement and tilt. The SigmaDSP audio processor comes with 24bit ADCs and DACs that is said to have over 100dB dynamic range. The audio processor features a 56bit fixed-point multiplier/accumulator, on-board data and programme memory, clock generation circuit, and acceleration blocks for common audio processing macro-functions (such as filters).

Available in a 4-by-4-by-1.45mm plastic lead-frame chip-scale package (LFCSP), the iMEMS accelerometer operates on power supplies as low as 2.4V with typical supply current of only 350μA, and can be power-cycled. The typical noise floor is 250μg per rtHz, allowing small tilt changes to be sensed using the narrow bandwidths (<10Hz) typical of human motion. Bandwidths of 0.5Hz to 2.5kHz may be selected to suit the application.




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Related Datasheets
Part Number Description Category
ADXL320 Small and Thin, ±5 g Accelerometer ICs, RF/Wireless

 
 
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