http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/60 2026-04-26T00:20:29Z 2026-04-26T00:20:29Z Rabsha, Halima Akther Ferdous, Jannatul Shanto, Md Mohiuddin http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/984 2025-09-08T03:37:42Z 2023-02-01T00:00:00Z

VOICE (GENDER) DETECTION FROM SUPERVISED LEARNING ALGORITHM USING MFCC IN BENGALI LANGUAGE Rabsha, Halima Akther; Ferdous, Jannatul; Shanto, Md Mohiuddin Gender detection from human behavior is a complex problem for digital technology studies. A collection of methods has been used to identify pertinent elements that can be used to create a model from a training set to classify gender from a voice signal. In this study, the Mel Frequency Cepstral Coefficient was used to distinguish between male and female voices in Bengali. 120 data of different voices were taken in wave (.wav) format and the audio length was five seconds for each data. For digitalized data, feature extraction was done by MFCC. After that, Singular Value Decomposition (SVD) was done to decompose the data into a single row with 14 coefficients. The extracted features are then used to train a supervised learning algorithm, such as a Support Vector Machine (SVM), with 86.7% accuracy for our train data set, to classify the gender of the speaker. The App Designer tool, Matlab GUI provides a userfriendly interface for users to input speech signals and display the predicted gender. The results show that the proposed model achieves high accuracy in gender detection on the test data set, real-life data has an accuracy of 83.33% for male voice prediction, and recorded data has an accuracy of 90%. Real-life statistics on women are 80% accurate, while recorded data are 86.67% accurate.

2023-02-01T00:00:00Z TASFEE, NAFISA IBNAT HASAN, SM MEHADY RUDRO, MD. SOYKOT TANVIN http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/983 2025-09-08T03:55:12Z 2023-02-01T00:00:00Z

EXPERIMENTAL STUDY OF MEAN FLOW CHARACTERISTICS OF SWIRLING JETS TASFEE, NAFISA IBNAT; HASAN, SM MEHADY; RUDRO, MD. SOYKOT TANVIN Different characteristics and performance parameters for the exhaust of nozzle are analyzed both experimentally and analytically to observe the behavior of the free jet and swirling jet discharge into a quiescent environment. Swirl plays a significant role by escalating the dispersion of free turbulent jets. Swirling jets represent one of a few basic flow pattern that has a great practical significance in practical field. It allow the fundamental study of complex but generic dynamical processes and their interactions. They feature prominently in a variety of propulsion systems. In combustion application, their ability to create reverse flow regions near the jet nozzle has been exploited for the purpose of swirl-stabilizing the flame. Swirling jets have many other possible industrial application also. The objectives of the present research is a comparative study between the plane circular jet and swirling jet. It was carried out to assess the effect of initial condition such as Reynolds number and pitch of swirls generator on swirling jets. A circular nozzle of 60 mm diameter was used for the whole experiment. Velocity profiles were attained for two initial condition Re = 8.4e4 & Re = 1.27e5. In the measurement system a 3-hole yaw-meter of United Sensor Ltd (USA) along with sensitive incline tube manometers were used for the measurement of axial velocity and flow direction. The yaw-meter was located in different position of the jet flow by a precision height gause which was mounted on a precision traversing mechanism. The velocity profiles for six conditions (a) Free jet, (b) Free jet with extension tube, (c) Swirling jet using 5 deg. (d) Swirling jet using 15 deg.. (e) Swirling jet using 15 deg. were evaluated in this study. It was found that the Reynolds number had little effect on the velocity profile of any of the described six cases. A top hat shaped velocity profile was observed near the nozzle exit of plane jet, as the flow develops the shape changes and become more like inverted U shape. The velocity profile for the free jet with extension tube is quite similar to the free jet but the profiles were smoother. Introduction of swirl with the jet increases the mixing of jet with surrounding air. For swirling jet the velocity deterioration is quicker than free jet. The potential core of free jet was present up-to axial distance of X/D = 3.5. EXPERIMENTAL STUDY OF MEAN FLOW CHARACTERISTICS OF SWIRLING JETS

2023-02-01T00:00:00Z AKASH, MD. ZAHIRUL ISLAM IQBAL, S.M. SHAHRIAR http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/981 2025-10-22T03:10:57Z 2022-03-01T00:00:00Z

STUDY AND DEVELOPMENT OF MOVING TARGET LOCATION AND RANGE ACQUIRING SYSTEM ALONG WITH GUI TO INCORPORATE IN A PROTOTYPE LOW-COST ACTIVE PHASED ARRAY RADAR. AKASH, MD. ZAHIRUL ISLAM; IQBAL, S.M. SHAHRIAR Radar is a detection device that employs radio waves to assess an object's distance, angle, or velocity. A Radar system comprises a transmitter that generates electromagnetic waves in the radio or microwave frequency range, a transmitting antenna, a receiving antenna, and a receiver and processor that determines the object's attributes. The object reflects radio waves from the transmitter, which return to the receiver and provide information on the object's location and speed. A phased array Radar usually means an electronically scanned array Radar, a computer-controlled array of antennas that creates a beam of radio waves that can be electronically steered to point in different directions without moving the antennas. The proposed research will provide the necessary knowledge of the cost-effective phased array Radar transmission system’s moving target location and range acquiring progress, including examining all the major subsystems via antenna principles and operation and software algorithms and simulations for search detection. The thesis was carried out to extract raw data from Infineon Technology’s Radar demo board Position2go based on the BGT24MTR12 transceiver and XMC4700 32-bit ARM® Cortex®-M4 MCU series. Using the built-in GUI of the Position2go module, raw data extraction was impossible. The system firmware was only compatible with a built-in GUI. Upon extracting the MATLAB code of the Position2go module, the IQ domain raw data could be extracted and plotted to visualise the graphical representation. From the graphical representation of IQ raw data, it was found that the graphical curve varies with the distance, angle & shape and as well as with the Approaching and Departing of the target. So with the help of this IQ raw data processed into the frequency domain and applying FFT, the distance could be measured, and by using phased FFT, the velocity could be achieved of the target, and also this raw data varies with the Departing and Approaching of the target and as well as with azimuth change. These possibilities can be distinctively identified and analysed through the graphical representation where different curve comparisons exist. The comparison ultimately leads towards the information given by the built-in GUI. And by doing extensive research on these IQ raw data of different possibilities of the target, a further developed private made GUI can be designed with the future development of this low-cost Position2go Radar module. Study And Development of Moving Target Location and Range Acquiring System Along with GUI to Incorporate in a Prototype Low-Cost Active Phased Array Radar.

2022-03-01T00:00:00Z ISHRAT JAHAN, TASNEEM HOSSAIN, MD MUZAHID NAHIAN, DEWAN SHEGUFTA http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/980 2025-10-22T03:11:23Z 2023-02-01T00:00:00Z

DEVELOPMENT AND TESTING OF A LOW POWERED COST-EFFECTIVE FREQUENCY MODULATOR FOR APPLICATIONS IN RF TRANSMISSION ISHRAT JAHAN, TASNEEM; HOSSAIN, MD MUZAHID; NAHIAN, DEWAN SHEGUFTA In this thesis the frequency modulation for different types of modulating circuits was studied and a low-powered, cost-effective modulator was developed. By changing the wave's instantaneous frequency, information is encoded in a carrier wave using frequency modulation. The technology is utilized in computing, signal processing, radio broadcasting, navigation and telecommunications. Three modulating circuits were designed and developed for the study. The performance of Triangular Modulating Circuit, Sawtooth Modulating Circuit and Sinusoidal Modulating Circuit was studied and analyzed in terms of message transmission. To validate the proposed modulating circuit, its performance was compared with MATLAB script, Simulink model and Python script. Its performance was also compared with the modulation done by existing model “EMONA Telecoms- Trainer 101” present at Electrical, Electronic and Communication Engineering lab of MIST. Results of the analysis show that if the modulation is linear, the frequency change is directly proportional to the modulating voltage's amplitude. Parameters of the modulated signal when used in MATLAB, Python and Simulink gave the same modulated signals that validates the modulation done by the proposed circuits. The proposed modulating circuits generate signal with very less noise at the desired voltage level which also matches the performance capacity of microwave VCOs. And so, it can be used effectively to develop a low cost FMCW Radar. The proposed modulating circuits can be used in telemetry, video broadcasting and recording, sound synthesis, medicine, navigation, aviation, radar, analog and digital data transmission and many other fields to a further extent DEVELOPMENT AND TESTING OF A LOW POWERED COST-EFFECTIVE FREQUENCY MODULATION FOR APPLICATIONS IN RF TRANSMISSION

2023-02-01T00:00:00Z