70th National Day parade, an unparalleled audio-visual feast

On the morning of October 1, the 70th anniversary of the founding of the People's Republic of China was held in Tiananmen Square, Beijing. At the celebration, General Secretary Xi Jinping delivered an important speech and held a military parade and mass demonstrations.

President Xi Jinping's utterances and sounds made a prominent position in major foreign media. The soldiers' upright and majestic posture and neat and powerful steps show the Chinese military authority. The newly unveiled weapons and equipment demonstrate China's military strength. The mass demonstrations, with their unique narrative and thematic expressions, condensed the 70-year journey of New China from "founding a business" to "reform and opening up" to "great revival". The whole celebration ceremony was grand and magnificent, reflecting China's development achievements in politics, economy, society, science and technology, and foreign media praised it.

Exciting and majestic questions and answers, clanging powerful footsteps, majestic military music, and melodious singing all depend on the powerful sound system after the opening.

According to Beilarly Audio, the difficulty of this 70th anniversary celebration is that the audience area is large in span, the speakers stacked on the ground are easily blocked, and the distance of the sound supply is long. The wide range of spaces involved in the celebrations ca n't find any reference in the world. The sound reinforcement system of the event should be coordinated with military parade, mass parade, party, etc. The technical requirements are very high, so it is necessary to ensure the system 's Safety and stability, sound quality and rationality of sound system equipment settings.

Nearly 400 microphones were installed along the entire square and along Chang'an Street. Through local mixers, the sound signals were collected and processed in the main PA room, then propagated from the main PA room to the power amplifier room, and finally to the audience.

In the design of sound reinforcement system, the speakers need to cover the area of Tiananmen Gate, the fixed viewing platform, the temporary viewing platform and the theme performance area. 4 groups of line arrays with full-band strong pointing control characteristics are used in the city tower area, each group is composed of 4 speakers and 2 cardioid ultra-low frequency speakers, which can effectively avoid strong reflections on the city wall and make the sound accurate and clear Is transmitted to the listener area of the tower more than 50 meters away, while still maintaining a very high dynamic margin.

The fixed viewing platform uses 20 sets of line arrays to cover, each set is composed of 3 speakers and 1 cardioid ultra-low frequency speaker. In order to avoid affecting the visual effect, the temporary viewing platform uses speakers with small volume, but with large sound pressure level and large dynamic characteristics. Through reasonable speaker layout and precise angle adjustment, the viewing platform finally achieved uniform and clear sound coverage.

For the audience in front of the screen, the surround sound they heard was the use of 3 studios, 4 relay systems, 5 recording vehicles, a total of 24 large and medium-sized mixers, plus 20 sets of portable mixers The effect microphones erected by the various subsystems constitute the largest surround sound field in the history of Chinese television, providing the most basic guarantee for surround sound live broadcast.

The 90-minute audio-visual feast affects the patriotic heart of all Yan and Huang descendants in each jumping pattern and beautiful notes. Demonstrating the great revival of the motherland has contributed a lot.