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258 Chapter 8
C:\Spk\Ref\RefGuideRevE\Enc-dec.fm
Signaling Encoder and Decoder - Screens and Control Fields
DTMF Sequence Encoder and Decoder
DTMF Sequence Encoder and Decoder
The DTMF sequence encoder creates dual-tone multi-frequency tone
sequences of variable frequency, amplitude, and duration. It’s signal
can be used to modulate the RF generator, or it can be output through
the AUDIO OUT connector.
The DTMF sequence decoder analyzes dual-tone multi-frequency tone
sequences and displays the associated parameters.
Measurement Limits
Lo Tone: 680 - 960 Hz
Hi Tone: 1190 - 1660 Hz
Actual limits are typically slightly wider than this. However, the
crossover point between Hi and Lo tone decoding is approximately 1.1
kHz. If incoming tones approach this point, unreliable measurements
may be displayed (frequency measurement errors and spurious off
times).