Technology / Terminology

Digicolor Wireless Products

2.4GHz Wireless Audio

Why Wireless?

There are many situations where wires become unpractical and clumsy. Wires limit the position of speakers and a performer's freedom of movement. Sometimes, the distraction of trailing wires is undesirable, while the freedom of wireless audio gives a great help to the performer¡¦s visual appeal. In other situations, such as Theme Park broadcasting, shopping malls announcements and restaurant background music, using a cable may not be practical. Moreover, it is always cool to make your devices wireless.

Wireless use radio transmissions to replace the audio cable. A wireless audio system consists of a transmitter and a receiver. The wireless transmitter and receiver operate like a radio station and a radio tuner. The audio signal is being modulated and propagated on the transmitter side. The receiver gets the signal, demodulate it, and convert that bad to audio signal. The receiver is designed so that it is only able to pick up the signal from one particular matching transmitter. Digicolor¡¥s wireless audio system is designed to have several channels to select and this makes the system to be more versatile (50 channels for Professional Series and other series have 16 channels). In addition, wireless receivers can operate from batteries so that they will be completely portable.

Why 2.4GHz?
2.4GHz is a licensed-free worldwide open frequency spectrum, and its bandwidth is wide enough to deliver full range frequency (20Hz to 20 kHz). Digicolor, with its proprietary 2.4GHz wireless audio advanced technology, delivers the full-range sound quality, while other wireless audio senders use the lower 900MHz frequency which is more crowded and subjects to higher-level of interference from surrounding cell phones and emergency stations.

True Diversity
A true diversity system is highly desirable because it effectively conquers the most common problem, signal dropouts due to multipath, with wireless system. Multipath occurs when RF signals arrive at a location from different transmission paths (usually referring to a combination of direct and reflected signals). Under these conditions, the audio output of the wireless receiver may become noisy, or the audio may be lost entirely for a short time. Multipath is most likely to occur in closed areas where many metal objects are present, but can occasionally be troublesome in most situations.

True diversity receivers are able to avoid dropouts due to multipath because they have two antennas and two receiver channels. Special circuits in the receiver select the audio from the antenna and receiver channel with the best signal. Because the chances that there will be simultaneous dropouts at both antennas are extremely low, diversity receivers provide almost complete immunity from dropouts due to multipath.

True diversity operation can also improve the useful operating range for wireless systems. This is because even when there are no actual total dropouts, multipath effects can reduce the amount of signal available at long ranges. This can cause the receiver to briefly lose audio well before the transmitter is truly out of range. With diversity, complete signal loss is much less likely and the useful operating range of the wireless system will be extended.

Digicolors' DCMOBILE101, uses true diversity technology for the receiver to ensure strong and stable receiving signal. It delivers excellent 2.4GHz RF performance even under adverse conditions.