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9. Audio indication
The sound is output to the headphones or the built-in sound transmitter. Three categories
of sound are used:
- «Natural» without filtering (broadband) to the phones;
- «Natural» filtered (narrowband) to the phones;
- «Synthetic» (modulation of sound frequency by the level of the filtered signal) to the
phones or to the built-in transmitter.
When working with AD only «natural» sound is used.
When working with EMD in the mode «natural sound to the phones» the adopted
«high active» frequency 8192Hz and 33kHz, before playing, are converted into a well-
acceptable «low» frequencies of 838Hz and 1574Hz respectively.
«Synthesized» sound is created by a principle: «Frequency of the audible sound signal
(pitch) is directly proportional to the signal level,» and the volume does not depend on the
level of the received signal. «Synthesized» sound is played while values
«figure≥2».
The volume of the headphones
correspond to the one change of figure on the display «8 ... 1/1...8».
Volume of the «synthesized» sound on the built-in transmitter can not be regulated.
is set by the operator using buttons ◄/►. Two pressings
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