Bandwidth Extension of Speech Signal Artificially & Transmission & Coding for Wireless Communication

2019 Research Paper

Authors: Prof. Mulchand Ayalani, Dr. R.N.Rathod, Dr. M. S. Holia
Journal: Journal of Communication Engineering & Systems 9 (02)

Performance of Three Phase T-Type Multilevel Inverter with Reduced Switch Count

2018 International Conference

Authors: Prof. Mulchand Ayalani, CHIRAG SOLANKI, M H AYALANI, S N GOHIL
Journal:

Analysis of a Modified Interleaved Non-Isolated Cuk Converter with wide range of load Variation and reduced Ripple content

2019 International Conference

Authors: Prof. Mulchand Ayalani, Beena B. Tuvar, M H AYALANI
Journal:

Comparison of 3-Phase 3-Wire Shunt Active Power Filters through Current Control Topologies

2018 International Conference

Authors: Prof. Mulchand Ayalani, Jaydeep A. Sejpal, M H Ayalani
Journal:

COMPARATIVE REVIEW BETWEEN CELP AND ACELP ENCODER FOR CDMA TECHNOLOGY

2013 International Journal

This review paper presents for analysis between code excited linear prediction and algebraic code excited linear prediction speech coding techniques which is useful in wireless communication for compression of speech signal to improve the data rate. from this paper we understood CELP encoder, decoder & ACELP encoder, and decoder & differentiate both the coding technology. How it used in WCDMA wireless communication system, the major factor in speech coding is bit rate which is reduced in ACELP coder up to 4.6kbps.Compare to CELP coder. In many applications for transmission of voice signal it conversion is needed for that speech coder is used.

Authors: Prof. Mulchand Ayalani, V.C.TOGADIYA, N.N.SHAH, R.N.RATHOD
Journal: International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering Vol. 2, Issue 1, January 2013

AC load control by SPWM technique

2013 International Journal

Induction motors are being used in greater numbers throughout a wide variety of industrial and commercial applications because it provides many benefits and reliable device to convert the electrical energy into mechanical motion. In some applications, it’s desired to control the speed of the induction motor. Because of the physics of the induction motor the preferred method of controlling its speed is to vary the frequency of the AC voltage driving the motor. In recent years, with the microcontroller incorporated into an appliance, it becomes possible to use it to generate the variable frequency AC voltage to control the speed of the induction motor. This study investigates the variable frequency power inverter. The variable frequency pulse width modulation (PWM) signal that controls the applied voltage on the gate drive, which provides the required PWM frequency with less harmonics at the output of the power inverter. The fully controlled bridge voltage source inverter has been implemented with semiconductors power devices isolated gate bipolar transistor (IGBT), and the PWM technique has been employed in this inverter to supply the motor with AC voltage. The proposed drive system for three & single phase power inverter is simulated using Matlab/Simulink. The Matlab simulation results of the proposed system were achieved with different PWM. From the result, a stable variable frequency inverter over wide range has been obtained and a good agreement has been found between the simulation and hardware of a microcontroller based single phase inverter.

Authors: Prof. Mulchand Ayalani, Abhishek H. Jadav & R. N. Rathod
Journal: International conference on Electrical,EC and Photonics

3 Phase AC load control by PWM technique

2013 International Journal

Induction motors are being used in greater numbers throughout a wide variety of industrial and commercial applications because it provides many benefits and reliable device to convert the electrical energy into mechanical motion. In some applications, it’s desired to control the speed of the induction motor. Because of the physics of the induction motor the preferred method of controlling its speed is to vary the frequency of the AC voltage driving the motor. In recent years, with the microcontroller incorporated into an appliance, it becomes possible to use it to generate the variable frequency AC voltage to control the speed of the induction motor. This study investigates the variable frequency power inverter. The variable frequency pulse width modulation (PWM) signal that controls the applied voltage on the gate drive, which provides the required PWM frequency with less harmonics at the output of the power inverter. The fully controlled bridge voltage source inverter has been implemented with semiconductors power devices isolated gate bipolar transistor (IGBT), and the PWM technique has been employed in this inverter to supply the motor with AC voltage. The proposed drive system for three & single phase power inverter is simulated using Matlab/Simulink. The Matlab simulation results of the proposed system were achieved with different PWM. From the result, a stable variable frequency inverter over wide range has been obtained and a good agreement has been found between the simulation and hardware of a microcontroller based single phase inverter.

Authors: Prof. Mulchand Ayalani, Abhishek H. Jadav & R.N. Rathod
Journal: