Software Defined Radio with Commercial Detection Technology Radio Commercial Detection Patent Pending For Radio Commercial Filter
Background
PSD Based Commercial Detector
With new inventions and an ever-growing mass of easily accessed digital media via the web and MP3 players, radio is falling behind as a source for music entertainment. There is a seemingly less amount of new technology that has gone into radio. This project brings life back into radio and improves the overall listening experience through the development of Radio Commercial Detection Technology. A commercial-detecting radio allows the listener to enjoy continuous music by eliminating the need to manually change stations.
Utilizes Welch’s periodogram using a Hamming window 10 second long tracking time required for start up Window divided into eight segments with 50% overlap PSD output is monitored for maximum slope Figure 2 – RCD technology eliminates the need to change radio stations to avoid unwanted commercials
Radio Receiver Front-End The radio receiver front-end provides the FM stations for the DSP processing by downconverting the entire FM band to be centered around baseband for sampling.
System
Figure 4 – Radio receiver and DSP hardware
The commercial-detecting radio automatically changes the station to one of four preset station when a commercial is played on the current station.
Tests show that a commercial is detected within 3 seconds after transitioning from music to commercial
Figure 3 – Shows the PSD output of a commercial (left) and a song (right)
Direct Conversion Architecture
Allows for a one-step conversion from RF frequency to baseband Enables the ability of a slower sampling rate for greater DSP overhead
Antenna
DSP
Figure 5 – Radio receiver front-end block diagram
Radio Receiver
Software Defined Radio
Commercial Detector
Figure 1– System-level block diagram of the commercialdetecting radio
Dan Allen
[email protected]
Joshua Bullard
Tommy Morse
[email protected] [email protected]
https://sites.google.com/a/aggiemail.usu.edu/sdr_rcdf/
Software Defined Radio The software defined radio performs the following functions: Complex mixing to perform channel selection Filtering and decimation to isolate channel Slope-detecting FM demodulation Channel changing between 4 preset stations when commercials are detected Figure 6 – Block diagram of the digital part of the system