Wireless microphones
Wired microphones and desktop stations are increasingly being replaced by wireless microphones and systems. By releasing several frequencies also for mobile or rental systems, a considerable improvement and security in the transmission of the voice signal has been achieved in recent years.
Advantages of wireless microphones are:
- Flexibility and mobility of the actors.
- No wiring required.
- Quick assembly and disassembly.
The wiring is replaced here by a HF transmission. Due to the very good quality of the wireless RF technology, no audible difference to the wired systems can be noticed nowadays. FM (frequency modulation) is used as the modulation type. Between the transmitter and receiver one selects a certain frequency, the so-called carrier frequency. For each transmission channel, one transmission channel with identical frequencies is required for each transmitter and receiver unit. There are different frequency bands (see wireless), which are released for different operations and types of operations or can be released upon request. Here is the Federal Network Agency the specifying instance.
By using a diversity mode, you can achieve even higher transmission reliability and sound quality. Here, two antennas are available at the same time to pick up the signal. The receiver now constantly checks at which antenna the signal of the transmitter microphone is stronger and automatically switches between the antennas if necessary.
By selecting suitable cables and antennas, attenuation can be minimized when extending cables and using switches.
With the arrival of more and more digital components, frequency hopping and other tools will significantly improve reception reliability.
