project2 - 8/4/2009 1 Engin 100: Music Signal Processing...

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Unformatted text preview: 8/4/2009 1 Engin 100: Music Signal Processing Project #2: Technical Specifications Reverse-engineer touch-tone phone signals Technical specs for touch-tone synthesizer Technical specs for touch-tone transcriber Analysis of transcriber performance in noise Reverse Engineer Touch-Tone Phone Signals Analyze spectra of touch-tone phone signals. Use abs(fft). Frequency pattern on keyboard. Synthesiz (in Matlab) a touch-tone keypad Synthesize (in Matlab) a touch tone keypad. Straightforward: similar to Proj. #1 keyboard. Transcribe touch-tone signals phone number. Look for specific frequencies-dont need fft. Analyze transcriber performance in white noise Engin 100: Music Signal Processing Project #2: Technical Specifications Reverse-engineer touch-tone phone signals Technical specs for touch-tone synthesizer Technical specs for touch-tone transcriber Analysis of transcriber performance in noise Analyze/Synthesize Touch-Tone Spectra 12 keys on phone keypad in file touch.wav . Sampled at 8192 Hertz; durations second. 12 signals: Analyze each using abs(fft) 12 signals: Analyze each using abs(fft). Each signal is sum of several sinusoids. Relate frequencies to touch-tone keypad. Synthesize touch-tone keypad (cf. Proj. #1). Get phone keypad that looks like next slide....
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project2 - 8/4/2009 1 Engin 100: Music Signal Processing...

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