A talkback microphone is a special type of microphone used in the film and video industries to allow production crew members – such as actors – to communicate with each other, via a speaker system, without having to leave their positions. This prevents costly delays due to constant re-takes, which would otherwise be necessary if the production crew had to leave their positions and re-take them after each spoken line or action.
A talkback microphone is sometimes referred to as a “hot mic“, due to the fact that, unlike most microphones, it can be kept live at all times. This enables film and video crew members – such as actors – to communicate with each other, via a speaker system, at all times.
How does a TV talkback system work?
In a typical talkback system, a wireless microphone worn by the presenter captures their speech and transmits it via infrared, radio or ultrasonic waves to a small speaker located in front of them. This speaker is connected to a central sound-mixing panel, which is itself connected to the production crew’s headphones.
The presenter can also wear an earpiece that allows them to take direction from the gallery or the director, they will also allow you to hear questions and comments from other presenters.
The earpiece doesn’t have a mic attached and plugged into the talkback system with the presenter, these are typically 3.5mm jack plugs (similar to those that plug into mobile phones and MP3 players.
The microphone’s transmitter is normally located within 10 feet or three meters of the actor who wears it, although longer distances are possible. A talkback microphone transmits at a frequency of 902-928 MHz, and some systems use multiple frequencies to prevent interference between units.
How does a film talkback system work?
In a typical film set talkback system, the actor wears an on-camera wireless microphone that captures their speech and transmits it via infrared waves to a speaker located on or near the camera. The production crew are connected to this speaker via headphones.
The production crew are free to move about as they please because their headsets are not being shared by the actor’s microphone. This prevents delays due to constant re-takes, which would otherwise be necessary if the production crew had to leave their positions and retake them after each spoken line or action. Talkback systems also eliminate the need for large numbers of crew members to “babysit” their positions during shooting.
What types of talkback system are available?
There are many different types of on-set wireless voice communications systems available – including boom mics, body-worn microphones, lapel mics, clip-on lavalier mics and hidden lavalier mics – but talkback systems are available in 2 main varieties.
The first type uses infrared (IR) digital modulation , which sends audio signals over the same kind of wavelength that TV remote controls use to control devices such as TVs, DVD players and set-top boxes. IR digital modulation is not used by video cameras, however, because the light that it emits can interfere with the operation of TV or film camera sensors.
The second type uses radio analog modulation , which sends audio signals over regular old FM radio waves. Radio analog modulation is widely employed throughout virtually all AV equipment – including wireless microphones, analog and digital video cameras and camcorders, professional audio equipment such as mixers, amplifiers and pre-amplifiers – because radio waves can travel much longer distances than those that are emitted by TV remotes.
Infrared VS radio waves?
Radio is better than infrared (IR) for on-camera mics because they can transmit further, but radio transmissions require a lot of power so it’s harder to maintain the battery life on the mic. Because of this, radio systems are primarily designed to be used with stationary cameras.
How many frequencies can a talkback system use?
Talkback systems come in both analogue and digital varieties. The first type uses radio analogue modulation , which sends audio signals over regular old FM radio waves, but they can also use infrared (IR) digital modulation , as well as ultrasonic sound waves. In theory, a single device could use all 3 types of transmission for maximum versatility, but this would be prohibitively expensive and overkill.
Talkback frequencies typically range between 902-928 MHz on analogue systems and 2.4 GHz on digital ones, as it’s unlikely that these frequency bands will suffer from interference considering their widespread usage in other equipment.
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