Mikazilkree The sampling frequency is controlled by the timer interrupt of the microcontroller. The Gaussian Noise distortion option is done by adding a random signal to the voice signals. The multimedia system allows the users to select preferred sampling frequency for compare and contrast purpose. The source code is the complete project created by the version of Visual Studio This data structure is set as below: We chose this topic because we are all interested in multimedia signal processing. The voice signal input is generated from the microphone, and the music signal is generated from any music application such as a MP3 player or PC. Furthermore, since we could transform the analog signal into digital format, we are able datasheet manipulate the audio data.

Author:Kazrarisar Kigakinos
Language:English (Spanish)
Published (Last):8 October 2014
PDF File Size:8.40 Mb
ePub File Size:16.85 Mb
Price:Free* [*Free Regsitration Required]

The above web links may subject to change anytime later. The source code is the complete project created by the version 3. In this way, the voice will sound like a robot. In the multimedia system, we have designed some special effects for voice processing.

The Java application consists of various buttons to allow users to control the intelligent multimedia system. The performance and characteristics of the device are essentially unchanged over the full g 4. It calls the WriteFile to transmit data. Moreover, we will give out all the credits to their valuable contributions.

The signal datashete be manipulated in the microcontroller. The code is as follows. From the result of our tests, we designed the multimedia system to only allow signal datashete within 10 of as the DC offset.

The conversion will be started by setting pin 3 from 0 to 1. Setting the upper threshold and lower threshold to the voice signal can filter the noise generated by the sine wave when there is no voice signal. Besides, initially we decided to output the processed signal to the speaker in the same approach that we learned in Lab 2. This is because the DC-offset is not exactly 2. In the part of music, since the music contains so much high frequency audio signal, the sample rate of our project could not capture those signals perfectly.

The Lower Pitch distortion option is done by averaging the past 16 voice signals from our test. The kernel of the system is controlled by the ATMega32 microcontroller, same as the one we used in the regular lab sections.

The output signal can then be propagated to a digital-to-analog chip DAC to transform the digital data to analog signal. Distortion — Gaussian Noise.

This project implements a multi-function multimedia system that allows the user to sing with the music video and generate some fancy sound effects. Therefore we implemented daatsheet sample buffer of size bytes to store the signal samples and reuse the buffer continuously.

We survey the some protocol of the communication of serial port in this famous websites. In the function setDistortionthe payload of datsaheet command packet indicates the distortion option chosen by the user through the GUI in the PC. However, we found that the sound quality was pretty datahseet since this approach used PWM mode of the microcontroller to generate an approximate signal and hence the accuracy of signal output was lowered. The program consists of a state machine and it consists of three states: For fatasheet, it is an apparent trend that the digital TV will replace the traditional TV in the future.

The satasheet of the echo is 0 to In this way, the voice will sound like a patient speaking very softly. Whenever the system receives a command packet from the PC which indicates to set the echo effect, the function setEcho is invoked to handle the rest of the packet payload.

In recent decades, multimedia becomes quite popular in our daily life. Most 10 Related.



Finally, the signal will be passed to the speaker and generate a wonderful melody. The console program configures the COM Port to run at a dacc rate of Thank you for your participation! With the development of technology, we are able to create, modify and edit multimedia sac The reference voltage is 5V. For example, we could store the analog data in digital format to make it more robust and lasting.








Related Articles