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A file chooser dialog pops up to select the file name. They can be found under the following directory of the package: The DAC circuit used is attached. Besides, we could generate the echo of our voice as if we are in a theatre.

Our design is based on the reference of a past project link. The packet structure for command packet has 4 bytes. This sleep makes sure that the console program exits before the Java application being closed. The overall design block of this system is shows as follows.

Clarification on Digital to analog conversion

This data structure is set as below: Our project not only has the industrial potential but also is suitable for academic research. The mixed signal is the combination of the voice signal and the music signal. Therefore, we chose as the upper bound and as the lower bound of the filter. Instead, we made use of the high speeds serial port for the data transfer between the PC and the microcontroller.

If right, how to provide the power supply to DAC? In the point of view of the multimedia industry, the application of audio processing is very important. So the internal ADC suits for our system requirement.

ECE Final Project

Is datasheer circuitry attached is the right one? The sample datasheett consists of a CWaveFile class. Following the instructions on the datasheet of DAC, we connected the output analog signals to an operational amplifier LM circuit, and the signals is passed to the speaker dqc808 generate dulcet sounds in the final stage.


We uses the method of mutual exclusion. The conversion rate is up to 15, samples at maximum per second. Initially both of the signals are in analog format, so we needed two analog-to-digital converters to transform the analog signal into digital format before feeding into the microcontroller.

It is the official site of JAVA that provides very clear documentation. If he wants to reset the MCU without re-launching the PC software, he should make sure that the multimedia system has been turned off before.

Also, we could understand more about the analog circuit when we integrated all the hardware components. Please refer to our reference section for details; 8.

In the microcontroller, we could capture both of the voice signal and music signal and mix them to generate special effects. Once the data is available, the thread appends the audio data into the wave file if it is required.

When the software exits, it call CloseFile to release the serial port. People enjoy the time viewing photos, listening to music, and watching movies. Besides, we also wanted to integrate this project with a wireless remote control that allows us to control our program anywhere in the effective range.

Our design does not cause any harmful effects to others, their property, reputation, or employment by unlawful action; 9. For the choice of user interface, we initially decided to use the buttons on the STK board as the control panel. In the process of doing this project, we found a team in Sound Effect Processor also used a similar topics. When the user wants to start this multimedia system, he should reset the MCU program first and then launch the PC software application.


I am clear about 15pf connection. Therefore, for no signal, the digital representation is theoretically With the development of technology, we are able to create, modify and edit multimedia data.

Once the Java application is launched, it creates a sub-process to execute the console program.

The application passes the clip filename datasheft a command line argument to the player. For example, we could record music in real time into an SD card.

In this way, the voice will sound like a robot. Finally, the processed signal is passed to a speaker to generate the sound. Every time, the program reads an input from the pipe. Therefore we implemented a sample buffer of size bytes to store the signal samples and reuse the buffer continuously.

Otherwise the whole circuit is same. The amplified analog signal of voice input is connected to PA0 to use the internal analog-to-digital converter to transform the voice signal into digital format. There were so some minor changes we datasheef in the system architecture while we were working on this project.

The range of the echo is 0 to Now just wire this up and see how it works. This section of code configures the port to be 8 bit data, no parity bit, one stop bit. The Op-Amp circuit has a 2. Use a instead as it is designed for negative voltages. Therefore, we did not expect the quality can be as high as the CD players.

Three separate power supplies daatsheet used, V1, V2, V3. The left panel is to display the waveform of the audio signal. Our program configures the serial port to run at a baud rate of bps.