Signal Processing Application

This was a Group Experiment performed by Aishwarya Bannore, Varad Choudhari, Gauri Joijode, Amisha Khimani and Apoorva Laharia. We choose "Morse Code Generator from a given Analog Signal" as an application.

Problem Definition : 1) Accept Analogy input and convert it into Digital Signal(Binary).
2) Covert Binary to Morse and implement the dots and dashes as 0 and 1 respectively.
    (Dots = 1 = LED ON, Dash = 0 = LED OFF)

Patent Review :

Portable Morse Code Signaling Device

Application Number : 05/101693

Inventors :     Johnson, Donald W. (Linton, IN) 
                     Stovall, Ronald J. (Crane, IN) 
                     Wheelock, Larry A. (Bloomfield, IN) 

Publication Date:  06/06/1972

Filing Date :    12/28/1970

Summary:  The patent says about producing a device that is capable of producing a light that flashes a Morse code signal. light source is energized by a source of energy and circuit means are provided to energize the light source according to an output signal from a shift register comprised of a plurality of flip-flops. A diode encoder having a plurality of switches is provided to select flip-flops that are to be set which, upon clearing of the shift register, provides a Morse code signal. A first oscillator is provided to pulse the shift register and a second oscillator is provided to pulse the diode encoder for resetting the flip-flops.

IEEE Paper Review: An Idea of an Assistive Computer Input Device Using Morse Code Recognition Controlled by Nipple Switch for Quadriplegics.

Publisher:  C. H. Liang, C. M. Wu, C. H. Luo.

(4th Kuala Lumpur International Conference on Biomedical Engineering 2008)

Summary: An idea of a useful assistive computer input device for quadriplegics is proposed in this paper, which will be a bifunctional device: keyboard and mouse. A user can control both functions by clicking a nipple switch combined by nipple and micro-switch with Morse-code encoding. To keep a stable typing speed and ratio for quadriplegics is very difficult, so a fuzzy algorithm will be applied to recognize the unstable Morse-code. 

  (1) Acquire the input signals from the nipple switch;

 (2) Translate the input signals to Morse-codes by a fuzzy algorithm. 

(3) Send the control signals to drive the mouse or to input the data as a keyboard through USB interface.

     Since we’ll only use one microcontroller and one nipple switch in whole device, the dimension of the device will be very small with reasonable low price so that the person with disabilities can afford and use conveniently.