Low Cost Voice Communication Device Design Using Ordinary Laser Torch and LDR Available in Bangladesh

2013 ◽  
pp. 223-229 ◽  
Author(s):  
Md. Kayesar Ahmmed ◽  
Anmona Shabnam Pranti ◽  
Arif Md. Shahed Iqubal
Keyword(s):  
Low Cost ◽  
Device Design ◽  
Voice Communication ◽  
Laser Torch ◽  
Communication Device

scholarly journals Alternative Voice Communication Device using Eye Blink Detection for People with Speech Disorders

2019 ◽  
Vol 8 (4) ◽  
pp. 12541-12543
Keyword(s):  
Brain Damage ◽  
Low Cost ◽  
Speech Disorders ◽  
Research Data ◽  
Voice Communication ◽  
Eye Blink ◽  
Communication Aid ◽  
Communication Device ◽  
Blink Detection ◽  
The Common

Speech disorders is an inability to articulate sound due to medical ailments such as brain damage, stroke to paralysis and several other diseases. Research data suggests that about 15 million people in the world have partial or complete impairment of language expression due to brain damage, mostly from stroke. In this work a low-cost speech assistant device is proposed an alternate augmentative communication device for stroke or paralyzed patients. The eye blink sensor is used as the primary sensor for detection of eye blink. Based on the eye blink gestures the common words are displayed in the LCD and these words are also converted as voice output. This prototype will be an alternate communication aid for people with speech disorders.

scholarly journals Near-Field Communication Sensors

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 3947 ◽  
Author(s):  
Zhonglin Cao ◽  
Ping Chen ◽  
Zhong Ma ◽  
Sheng Li ◽  
Xingxun Gao ◽  
...  
Keyword(s):  
Communication Technology ◽  
Low Cost ◽  
Near Field ◽  
Near Field Communication ◽  
Daily Life Activities ◽  
Quality Detection ◽  
Communication Device ◽  
Real World Applications ◽  
Wireless Signal ◽  
Communication Devices

Near-field communication is a new kind of low-cost wireless communication technology developed in recent years, which brings great convenience to daily life activities such as medical care, food quality detection, and commerce. The integration of near-field communication devices and sensors exhibits great potential for these real-world applications by endowing sensors with new features of powerless and wireless signal transferring and conferring near field communication device with sensing function. In this review, we summarize recent progress in near field communication sensors, including the development of materials and device design and their applications in wearable personal healthcare devices. The opportunities and challenges in near-field communication sensors are discussed in the end.

scholarly journals Design and characterization of a 3D-printed staggered herringbone mixer

BioTechniques ◽  
2021 ◽  
Author(s):  
Vedika J Shenoy ◽  
Chelsea ER Edwards ◽  
Matthew E Helgeson ◽  
Megan T Valentine
Keyword(s):  
3D Printing ◽  
High Throughput ◽  
Low Cost ◽  
Microfluidic Devices ◽  
Device Design ◽  
Replica Molding ◽  
3D Printed ◽  
And Performance ◽  
To Receive

3D printing holds potential as a faster, cheaper alternative compared with traditional photolithography for the fabrication of microfluidic devices by replica molding. However, the influence of printing resolution and quality on device design and performance has yet to receive detailed study. Here, we investigate the use of 3D-printed molds to create staggered herringbone mixers (SHMs) with feature sizes ranging from ∼100 to 500 μm. We provide guidelines for printer calibration to ensure accurate printing at these length scales and quantify the impacts of print variability on SHM performance. We show that SHMs produced by 3D printing generate well-mixed output streams across devices with variable heights and defects, demonstrating that 3D printing is suitable and advantageous for low-cost, high-throughput SHM manufacturing.

scholarly journals Engineering of An Innovative Oral Scientific Communication Device: Case of the Doctoral Training Context

2021 ◽  
pp. 133-140
Author(s):  
Soufiane Zerraf ◽  
Mustapha Bassiri ◽  
Siham Zain ◽  
MalikaTridane ◽  
Said Belaaouad
Keyword(s):  
Communication Network ◽  
Packet Loss ◽  
Low Cost ◽  
Gain Scheduling ◽  
Networked Control System ◽  
Control Technique ◽  
Loop Control ◽  
Communication Device ◽  
Efficient Information ◽  
True Time

The use of a communication network in the closed loop control systems has many advantages such as remotely controlling equipment, low cost, easy to maintenance, efficient information transmission, etc. However, the Networked Control System (NCS) has many drawbacks, such as network-induce end-to-end time delay and packet loss, which lead to significant degradation in controller performance and may result in instability. Aiming at solving performance degradation in NCS, this paper propose to take the advantages and strength of the conventional Proportional-Integral-Derivative (PID), Fuzzy Logic (FL), and Gain Scheduling (GS) fundamentals to design a Fuzzy-PID like-Gain Scheduling (F-PID-GS) control technique, which has been proved to be effective in obtaining better performance. The True Time toolbox is used to establish the simulation model of the NCS. Ethernet as a communication network is simulated for different load conditions and random packet loss. The design approach is tested on a second order stepper motor. The results obtained show the effectiveness of the proposed approach in improving the overall system performance.

Building a low cost low power wireless network to enable voice communication in developing regions

2012 ◽  
Vol 16 (2) ◽  
pp. 2-15 ◽  
Author(s):  
Vijay Gabale ◽  
Jeet Patani ◽  
Rupesh Mehta ◽  
Ramakrishnan Kalyanaraman ◽  
Bhaskaran Raman
Keyword(s):  
Low Power ◽  
Wireless Network ◽  
Low Cost ◽  
Developing Regions ◽  
Voice Communication

scholarly journals Circuits for Optical Based Line of Sight Voice Communication

2017 ◽  
Vol 6 (1) ◽  
pp. 76-80
Author(s):  
Devasis Haldar ◽  
Shagun Panwar ◽  
Vipul Kumar ◽  
Ayush Goswami ◽  
Sakshi Dhawan
Keyword(s):  
Optical Signal ◽  
Electrical Signal ◽  
The Body ◽  
Volume Control ◽  
Line Of Sight ◽  
Voice Communication ◽  
Op Amp ◽  
Voice Signal ◽  
Laser Torch ◽  
Class B

We present here line of sight communication between a person and his neighbour with the help of optical signal produced by a laser torch which act as a carrier. It is therefore a wireless communication and the transmission can go up to 500 meters. We used photodiode to receive the signal at the receiver. The transmitter circuit comprises condenser microphone transistor amplifier BC547 followed by an op-amp stage built around µA741. When we give a voice signal from the mike, it converts the voice signal into the electrical signal. This electrical signal is fed to IC741 (op-amp) for amplification. The gain of the op-amp can be controlled with the help of 1-mega-ohm potentiometer. The AF output from IC is coupled to the base of a class B amplifier which, in turn, modulates the signal. The transmitter uses 5V power supply. However, the 3-volt laser torch (after removal of its battery) can be directly connected to the circuit-with the body of the torch connected to the class B. The photodiode converts the optical signal into electrical signal and again this signal is amplified using IC741 and a combination of class B push pull amplifiers. The receiver circuit uses an NPN photodiode as the light sensor that is followed by a two-stage transistor preamplifier and IC741 based audio Power amplifier. The receiver does not need any complicated alignment. Just keep the photodiode oriented towards the remote transmitter’s laser point and adjust the volume control for a clear sound. The sensor must not directly face the sun.

Introduction to Mobile Multimedia Communications

2011 ◽  
pp. 1-23
Author(s):  
Gour C. Karmakar ◽  
Laurence S. Dooley ◽  
Michael Mathew
Keyword(s):  
Mobile Technology ◽  
Mobile Communication ◽  
Low Cost ◽  
Communication Technologies ◽  
Voice Communication ◽  
Switched Networks ◽  
Analog To Digital ◽  
4G Networks ◽  
Increasing Demand ◽  
4G Mobile Communication

In order to meet the ever increasing demand by people using mobile technology and its associated services based on multimedia elements in addition to voice, mobile communication technologies has since evolved from analog to digital and 1G to 4G. This chapter presents a contemporary review of all generations of mobile communication technologies, including their standards. 1G to 3G mobile communication technologies are mainly optimised for voice communication, using circuit switched networks. To provide high transmission mobile services at low cost in all levels of networks—personal, home, and cellular—it is imminent to exploit the merits of all existing technologies such as Bluetooth, WLAN, and HiperLAN, and use IP as a backbone network in 4G mobile communication standards. The key research challenges for mobile terminals, systems, and services for 4G networks are also presented in this chapter.

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