All posts in the 'Audio and Video' Category
Posted on 13 Feb 2008
This project devised by two Cornell students in 2003,they wrote: For this endeavour, we first built an input stage that will amplify the input signal, as well as bias it to 2.5V (since the ADC can only sample positive signals). The ADC (MAX1111) is controlled by the microprocessor (Mega 32) using the SPI interface which was much easier than manually configuring a port to interface with the ADC(believe me, we tried that). We set the Mega 32 to sample the input at about 12 KHz which is fast enough to meet the Nyquist requirement for analog to digital sampling. The digital effects were done using by manipulating the input (which will be discussed in the Design page) and the output is passed to a R-2R DAC to a output amplifier stage and finally, to the speaker.[more]
Posted on 12 Feb 2008
This project used for detecting any audio signal with justable noise offset. It could be used to generate a radio mute signal eg. from a PDA.The circuit is consisting of:Input impedance ,Signal amplifier, Rectifier , Justable comparator (Noise offset).[more]
Posted on 06 Feb 2008
MP3stick is a very cool simple and small portable MP3 player project which I haven’t seen before. A microcontroller Atmel AVR ATmega128 is the heart of the circuit. MP3 decoding is done by an VLSI VS1011b decoder IC. A MMC/SD card works as memory medium for MP3 files, playlist files and skin files. The player is designed to draw his power from a LiIo/LiPo battery with 3.6V.[more]
Posted on 05 Feb 2008
The system consists of sensors and wireless module to interact with Max/MSP audio software and also allow the users to play and compose music at the same time but in different location.For each box, there will be 5 photocell sensors with laser projected on and 3 distance sensors. The photocell sensors will be acting like on/off switch to determine which note is playing, and the distance sensors will control the special effect depending on the user¡¦s position. Then, each box will transmit and receive data to each other to compose at the same time. All of the music and instruments are compiled within the Max/MSP software. [more]
Posted on 04 Feb 2008
ATmega8 Video Overlay is a very simple Video Overlay but it wokrs fine.This projectd esigned by garydion.[more]
