![]() Some modern VOX circuits eliminate this problem by recording or transmitting a delayed version of the input signal. Transmitters and recorders have short but finite activation times that Minimized with an "anti vox" feature to decrease VOX sensitivity when the receiver is active. ![]() The VOX in a two-way radio can also be triggered by the loudspeaker carrying the other side of the conversation. Conversely, it may not activate when desired on speech that is too weak. Most VOX circuits have a sensitivity adjustment, but unwanted (and sometimes undetected) VOX triggering can still occur on background noise, heavy breathing or a side conversation. But VOX also has some significant disadvantages that explain why PTT is still common. Unlike manual push-to-talk (PTT) operation, VOX isĪutomatic the user can keep his or her hands free while talking. For example, a microphone may send a voltage high enough to directly operate a transmitter. The circuit usually includes a delay between the sound stopping and switching direction, to avoid the circuit turning off during short pauses in speech.Ī special case exists, if there is enough energy to power the system directly. Intercom systems that use a speaker in a room as both a speaker and a microphone will often use VOX on the main console to switch the audio direction during a conversation. On cell phones, it is used to save battery life. It is used instead of a push-to-talk button on transmitters or to save storage space on recording devices. ![]() It is usually used to turn on a transmitter or recorder when someone speaks and turn it off when they stop speaking. In telecommunications, a voice operated switch, also known as VOX or voice-operated exchange, is a switch that operates when sound over a certain threshold is detected. ![]()
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