1 VFT? Voice Frequency carrier telegraph Terminal?

2 VFSS? Voice Frequency Signaling System?

3 VFCT? Voice Frequency Carrier Terminal?

4 VFDE? Voice Frequency Dialing Equipment?

5 VFT? Voice Frequency Telegraph?

6 VFO? Voice Frequency Oscillator?

7 VFREP? Voice Frequency REPeater?

8 Spectrograms show Kosik's voice frequency when he makes human sounds is similar to his keeper's.

9 VFC? Voice Frequency Carrier?

10 Double voice frequency signal: Every number is represented by two signals that are different in frequency.

11 VFC? Voice Frequency Cable?

12 Double voice frequency signal: Every dial number is represented by two signals that are different in frequency.

13 In researching computer voice input, analysis of voice frequency is a crucial step.

14 VFF? Voice Frequency Filter?

15 VFD? Voice Frequency Dialing?

16 The voice frequency authoring software also needs to be installed in the system, and the computer solely to product the program.

17 VFC? Voice Frequency Channel?

18 This system had functions with video compression, decode, network transmission, image store, image index playback, long-range control of vidicon, PTZ control and voice frequency alarm.

19 Dual Tone Multifrequency(DTMF), also known as Touch Tone or Tone Dialing, is used for telephone signaling over the line in the voice frequency band to the call-switching center.

20 You are also not allowed to communicate on any text or voice frequency in use by pilots and regular ATC.