Project
# | Title | Team Members | TA | Documents | Sponsor |
---|---|---|---|---|---|
40 | Add-on box for old stereo systems |
Chutian Shao Tong Zhao Ziyang Liu |
Jose Sanchez Vicarte | design_document0.pdf final_paper0.pdf presentation0.pdf proposal0.pdf |
|
Members: Tong Zhao (tzhao11) Chutian Shao (cshao5) Ziyang Liu (zliu63) Problem: Old stereo systems often lack modern features like equalizer and convenient way of control. For example, a user need to physically turn volume knob or press buttons on the audio equipment. Solution: A cheap add-on box that can be inserted into the signal path of existing stereo systems. It will be controlled wirelessly via Bluetooth using a smartphone app, and uses RCA for inputs and outputs, so it is compatible with most existing audio equipments. It will provide the following features: - Volume control - Select between multiple inputs (Multiplexer) - Equalization (EQ) - L/R channel balance - Sleep timer / alarm: mute/unmute at user specified time There are two approaches of doing the signal processing: one is using analog circuits. The other one is to use an ADC to convert the analog audio signal to digital and do all the processing digitally, and use a DAC to convert back to analog. If we go this way, we are able to add more DSP effects (reverb, etc.), even dynamically load/unload effects with the smartphone app. However, the additional ADC/DAC will decrease audio quality. Since signal processing decreases audio quality, the device will have an audiophile/Hi-Fi mode that bypasses all processing except volume control to keep audio quality as close to input as possible. The device will be powered by standard USB port. |