The BGM played in parks, scenic spots, shopping malls, playgrounds and other places is generally in poor quality and sometimes harsh to listen; in some extreme weather conditions, it even produces noise frequently. This, actually, is the common problem in PA industry, including poor sound quality, delayed response, poor transmission effect, and influences caused by extreme weather during long-distance transmission. Therefore, in some places with high sound requirements, people usually choose to purchase imported equipment instead of using the PA system, which not only increases the cost, but also slows after-sales maintenance and cannot provide a strong guarantee for usage.

In fact, the industry has made many theoretical improvements and practices for the transmission problems of PA system. Here are some feasible methods:

1. Convert audio source into digital signal for transmission. The audio sources are stored as the digital signals, and the audio source transmission from the controller to the amplifier adopts network signals, which can reduce the loss of the audio source during the transmission and conversion process.

2. Use constant-resistance speaker for short-distance transmission. The constant-resistance speaker, without an inter-wire transformer, does not conduct secondary processing on the transmitted sound, which greatly reduces the sound loss and relatively improves the sound quality.

3. Select different transmission lines according to different conditions. The harsher the conditions, the thicker the lines. And to basically ensure the sound effect, we usually use rvv2*1.5 lines in regular indoor environment, and use rvv2*2.5 lines in outdoor environment.

4. Select the speaker with better materials and higher internal damping. The speaker is the last medium to make sounds, which has a decisive effect on the sound effects. The speaker made of better materials can produce better sound quality and higher sound reproduction.

In response to the current transmission problems of PA system, the itc R&D team, learning from the past improvement methods, deeply explored the broadcasting transmission signal, and finally developed the itc digital PA system. Using professional noise reduction algorithms and audio processing methods, the digital PA system starts from the various media in the sound transmission process, optimizes and improves each link to achieve the sound effects of high fidelity, low delay, and lossless transmission.

HIFI Sound Quality

Using 48k lossless acquisition and lossless format transmission, it can easily solve the problem of audio source loss during transmission. Adopt the professional digital amplifier, built-in DSP audio processor, high and low filtering, limiter, built-in network decoding module, it can realize network BGM playback, and greatly reduce the sound loss in audio decoding process. The HIFI speaker ensures higher sound reproduction.

Low-delay Transmission

The end-to-end digital optical transmission can be as fast as 1/1,000 seconds. And the ultra-low network transmission delay is as low as 1/100,000 seconds. It supports synchronous music playback in different zones, and emergency information release. The time interval of senseless synchronization is almost zero, and the emergency response is rapid.

Lossless Transmission

Adopt optical ultra-long-distance transmission, high bandwidth, and anti-electromagnetic interference, it can greatly avoid the influence of harsh environments. Connecting with professional DSP network amplifier, it can provide super audio processing effect, lossless audio conversion, and present a better original sound effect.

The itc digital PA system is a comprehensive management system widely used in the cultural tourism industry and professional sound business. The system integrates various functional modules such as high-fidelity broadcasting, real-scene monitoring, mega data statistics, information push, multi-track broadcasting, senseless synchronization, float parade, emergency help, etc. Using the audio source acquisition, audio transmission technology, professional digital amplifiers, and HIFI speakers, it has built a comprehensive and high-quality audio solution.