What is Music Equalizer ?
Block Diagram of Music Equalizer
Audio Input: The Audio input can be taken from any music player. Mobile phone music player is used as the music input which is feed to DSK 6713 kit through line in connector. Mono channel is used for simplicity.
Analog to Digital Conversion: DSK 6713 has the built in A/D converter which converts the analog input signal into digital signal so that digital processing can be done on the input. The sampling frequency is set to 48kHz. Word length is 16-bit, scaling is normalized and samples per frame are 64. Refer to the diagram below :-
Preset Band Gains for Equalizer: Music effects are produced simply by changing the gains of separated signals of different frequencies. For example, the bass effect is achieved by increasing the gain of lower frequency signals. Preset Band Gain block consists of the 4 set of preset gain which produces Flat, Rock, Bass and Opera Effects. Gain setting for Bass effect is shown below.
Preset Selector: Dip switches on the DSK-6713 are used for preset selection. Zero indexing is used so that normal (flat) preset is selected when no button is pressed. Led on the Kit indicates the preset selection. Parameters of DIP switches are set as shown in figure.
Signal Adder: Signal adder combines all separated signals of different frequencies after completing the processing. Simple adder is used for this purpose.
Digital to Analog Conversion: After the combining, the signal is converted in analog. This is done by DSK 6713 built in D/A converter. The sampling frequency of the A/D and D/A should be same for better output.
SIMULINK MODEL FOR MUSIC EQUALIZER ON DSK 6713
You can download the simulink model for the above equalizer from the link given below, however the snapshot of our working simulink model is given below :
Download Simulink Model for Music Equalizer here. In case of any problem. feel free to contact at email@example.com
Important Note: This term project of Digital Signal Processing is supervised by Assistant Professor S K Hasnain and is the property of the following students of Pakistan Navy Engineering College (NUST).
- Ahmed Fawad
- Waseem Ahmed
- Aziz Ahmed
- Arslan Amin Dhoraji Wala