Keysight U8903B - Dual-Tone Multi-Frequency (DTMF); Figure 3-54 Analog Generator > Waveform Config Menu Page 1 (DTMF)

3 Audio Generator Functions
138 Keysight U8903B User’s Guide
Dual-Tone Multi-Frequency (DTMF)
Dual-Tone Multi-Frequency (DTMF), also known as touch-tone, is a system of signal tones
used in telecommunications. Applications include voice mail, help desks, telephone
banking, and others. DTMF is only applicable for the analog generator only.
There are 12 DTMF signals where each of the signal is made up of two tones from the
following selection:
– 697 Hz
– 770 Hz
– 852 Hz
– 941 Hz
– 1209 Hz
– 1336 Hz
– 1477 Hz
The tones are divided into two groups (low and high), and each DTMF signal uses one from
each group. This prevents any harmonics from being misinterpreted as part of the signal.
The waveform configuration for DTMF is displayed as shown in Figure 3-54.
Figure 3-54 Analog Generator > Waveform Config menu page 1 (DTMF)