Saving investment: research on the sharing of broadcast speakers and multimedia speakers

Saving investment: research on the sharing of broadcast speakers and multimedia speakers
Tianjin Tiandi Weiye Digital Technology Co., Ltd. Feng Tao
First, the problem
The broadcasting system has always been one of the basic equipment of the campus. Every school needs to use radio every day to broadcast radio gymnastics, eye exercises, notifications, and class bells, so various speakers are distributed in various parts of the campus-indoor , Outdoor, grass, waterproof, etc .; with the acceleration of campus information construction, multimedia teaching equipment such as computers and DVD players have also entered the classroom, so each classroom is installed with ordinary multimedia speakers for multimedia equipment Audio playback; in some large classrooms, due to the large space, the sound of teachers ’lectures cannot be heard by students who are far away, so the classroom needs to install sound reinforcement equipment and speakers; so some classrooms will have two or three There may be as many as 4 or 5 speakers, which not only takes up space but also affects the aesthetics of the classroom environment. Once several speakers sound at the same time, they will interfere with each other and no one can hear them clearly.
So there is a problem of repeated investment in the school: many times the investment is to buy the speakers, but the various speakers have a single function, independent use, and are not conducive to management and maintenance.
Second, the premise of solving the problem
In fact, everyone hopes to use only one kind of speakers in the classroom, which not only saves investment, but also reduces the workload and complexity of maintenance, and naturally there will be no problem of multiple programs interfering with each other. So how can a speaker be used to broadcast campus radio, classroom programs, and classroom amplification? To achieve the above goals, the following prerequisites must be met:
1) It must be the front-end equipment of the campus broadcasting system and can be connected to the broadcasting system;
As we all know, the broadcasting system has its extensive distribution factor. Although it is not necessarily required to cover all corners of the school, it should be most of the area. Therefore, if the speaker wants to access the broadcast system, its audio transmission processing part must meet the needs of distributed and long-distance transmission.
2) It must be a multimedia speaker with a standard interface that can be directly connected to a computer, DVD player, etc. to play audio programs
The biggest difference between multimedia speakers and broadcast speakers is that they are used locally. The speakers and equipment are generally in a room, and the distance will never exceed 50 meters. Therefore, the input audio signal level is weak, generally only a few hundred millivolts, which is not enough to promote the normal operation of the speaker, so the multimedia speaker is generally composed of the speaker and the power amplifier;
3) There must be sufficient volume and expansion interface
Students who are far away from the teacher in the classroom can't hear the teacher's speech clearly, they need to use the loudspeaker to make up for the problem of insufficient voice volume. Generally speaking, the size of the classroom is not very large, and it is not necessary to use special loudspeakers with high power. Therefore, it is generally solved by high-power multimedia speakers, but the power of the multimedia speakers is fixed, and it is meaningless to make them into high-power. It is made of small power and cannot be used in large classrooms;
4) Broadcast content must be distinguished, and broadcast, multimedia, etc. cannot be played simultaneously
When the same speaker is used for broadcasting, multimedia and sound reinforcement, distinguishing the broadcast content becomes an issue that must be considered. When multimedia teaching is being conducted in the classroom, the school has an important broadcast notice to be broadcast throughout the school, whether it is played simultaneously or only one How to ensure the priority of broadcasting in the whole school has also become a problem that must be solved.
3. Analysis of Tiandi Weiye Broadcast Intelligent Integrated Speaker
(Company Profile) Tianjin Tiandi Weiye's intelligent integrated speaker is composed of a broadcast receiving module, power amplifier module and speakers, and organically integrates the broadcast speaker with classroom multimedia speakers and sound reinforcement speakers into a whole. Not only solves the contradiction between distributed use and independent use of broadcast speakers, but also solves the priority problem of broadcast content:
1. The speaker adopts wired frequency modulation technology, serial wiring, long distance distribution, easy expansion;
The speaker adopts the third-generation digital audio demodulation technology to accurately demodulate the broadcast audio signal and control signal transmitted by the cable TV line, ensuring the centralized control of the broadcast room after the speaker is distributed over a long distance. FM technology carrier multiplexing technology also allows speakers to receive multiple sets of programs at the same time, the biggest advantage of on-demand zone playback is to make each speaker play the content that listeners need.
2. The speaker provides a set of standard audio input interfaces, which can be directly connected to multimedia devices;
At present, the sound of multimedia speakers is composed of treble and bass, and the material and material density of the cabinet have a great influence on the effect of the bass speaker. The density of the wooden cabinet of the Tiandi Weiye intelligent integrated speaker is large, and the vibration generated by the cabinet is small when it sounds, so the bass effect is very good. The high-quality tweeter greatly reduces the restoration distortion of the treble signal. When using the deck to play English listening or news programs, the human voice is friendly and thorough.
3. The speaker provides a set of auxiliary speaker output interface, which can be connected to the auxiliary speaker to increase the listening range;
Under normal circumstances, the background noise of large shopping malls is about 60db, and the background noise of bustling roads is about 70db. Considering the characteristics of the classroom, we temporarily set the background noise in the classroom to 65db, that is, the sound pressure level of the broadcast coverage area should be 80db. According to calculations, using 90db / 8w speakers in a 7m * 8m ordinary classroom is enough to make any location of the classroom within the broadcast coverage area, while in larger classrooms, additional speakers (ie auxiliary speakers) can be added to meet the large The need for range listening.
4. The speaker's local amplification function and the main control room broadcast content reception status are automatically switched for flexible use;
When the classroom speakers are playing the audio program of the local computer or multimedia equipment, there is a temporary emergency notification in the main control room that needs to be broadcast. After the main control room issues the instruction, the classroom speakers will automatically switch to the state of accepting the main control broadcast, ensuring the school's broadcast. Highest priority. When the main control room broadcast is over, the speaker will automatically return to the state of playing local device audio, two-level control, multi-function application.
4. Comprehensive comparative analysis
Traditional way
Intelligent integration
price comparison
Price = speaker + power amplifier + multimedia speaker + amplified speaker
Price = integrated speaker + auxiliary speaker
Specification comparison
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