College - Author 1

College of Engineering

Department - Author 1

Electrical Engineering Department

Degree Name - Author 1

BS in Electrical Engineering



Primary Advisor

Taufik, College of Engineering, Electrical Engineering Department


A digital loop station is an electronic device that takes an analog audio signal, samples it with an Analog-to-Digital converter, stores it digitally in a system memory, and repeatedly outputs the content to a Digital-to-Analog converter. The signal is controlled by use of a microcontroller and amplified by external circuitry. The purpose of a digital loop station is to record and store an audio sample in real-time then playback the stored signal and superimpose additional audio signals over it. This project details a 16-bit digital loop station that samples at a rate of 44.1 kHz which is the industry standard for CD quality music. This loop station has three functions available to the user -- record, playback, or reset. Tests performed on the prototype demonstrated successful operation of the digital loop station. Two issues remain unresolved: high frequency noise at the analog output and a slight discontinuity in the processed audio waveform.