Dual-Tone Multi-Frequency Dial Tone Detection
Utilizing dual-tone multi-frequency technology to identify dial tones when audio input is available, with implementation approaches for signal processing and tone recognition
DTMF (Dual-Tone Multi-Frequency) Signal Implementation and Analysis
DTMF (Dual-Tone Multi-Frequency) is an encoding technique that uses specific pairs of audio frequency tones to represent digit signals, where different frequency combinations correspond to different numbers or functions. This system utilizes 8 distinct frequencies to encode 16 telephone keypad buttons (digits 0-9 and symbols *, #, A, B, C, D). Key implementation requirements include: (1) Generating corresponding DTMF signals in MATLAB based on keyboard input symbols; (2) Calculating signal spectra using both FFT and Goertzel algorithms with spectral plotting; (3) Verifying symbol consistency between input and decoded signals through spectral analysis.
MATLAB Implementation of DTMF Signal Generation and Detection
MATLAB code implementation for DTMF (Dual-Tone Multi-Frequency) signal processing with comprehensive signal generation and detection algorithms