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Frequency Analysis ( Dual - Tone Multi Frequency ( DTMF ) Decoder ) Given a . wav file that contains a very noisy DTMF signal,
Frequency Analysis DualTone Multi Frequency DTMF Decoder
Given a wav file that contains a very noisy DTMF signal, your task is to build a DTMF decoder using any computer languages MATLAB is recommended to decode this signal. Make sure that the system is fully automatic. Although, a realtime approach is preferable, a batch processing for each segment is acceptable.
Hints:
Here is how DTMF works. It generates frequencies for each key pressed. For example, when an key is pressed, the DTMF signal consists of and components. A keypad and the frequencies are shown below.
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Hints: cont
Listen to this wave file should help.
Segmentation for each segment may use a thresholding, etc.
For each segment, do the frequency analysis.
Make a decision based on the previous step may use the nearest distance, etc.
Note:
Discussion section of your report is very important. Make sure you write down everything you observe. Wrong observations are better than none.
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