[Home Theater Network HDAV.com.cn] The most easily overlooked in the traditional home theater environment is the acoustic design. We often think that the home theater is also sound-absorbing, and the speaker is placed on the speaker. But things are often not the case. A good cinema environment design is also very important for the restoration of audio or video, not what we think is "so simple." Classification and characteristics of room acoustics First, the methods of indoor acoustics include geometric acoustic methods, statistical acoustic methods, and wave acoustic methods. When the indoor geometrical size is much larger than the acoustic wave wavelength, the geometrical acoustic method can be used to study the early reflected sound distribution to enhance the direct sound and improve the uniformity of the sound field, thereby effectively avoiding the sound defects. The statistical method we are talking about is to study the growth, stability and attenuation process (ie, the reverberation process) of the acoustic energy density under the excitation of continuous sound source from the energy point of view, and give the exact definition of the reverberation time, so that subjective evaluation The combination of standard and acoustic objective quantity provides a scientific basis for indoor acoustic design. When the indoor geometric size is comparable to the acoustic wavelength, the resonance phenomenon is easy to occur, and the sound quality will be chaotic. At this time, we can use the wave acoustic method to study the indoor sound. The positive vibration mode and the generation condition are used to improve the uniformity and spectral characteristics of the sound field in a small space, thereby coordinating the characteristics of the room acoustics and ensuring a reasonable sound propagation mode. When using acoustic materials, we must take into account the advantages and disadvantages of the entire listening environment, and do not use them blindly, otherwise it will be counterproductive. The application of building acoustic materials is to treat the physical conditions and acoustics of indoor acoustic wave transmission to ensure good listening conditions in the room, and to block the noise and interference outside the building, and to create an audio-visual room that meets the indoor learning environment. . Acoustic design considerations In the traditional acoustic design, we not only cut the sound bridge of the outside and indoor, but also consider the transmission and reflection of sound in the environment. On the other hand, we must strengthen the sound in the sound transmission. Reflection, so that sound energy is evenly distributed and diffused in the building space, just like the design of our hall or theater, it can ensure that the audience can hear clear and natural sound and loudness in every position. On the other hand, we should pay attention to the sound absorption materials and sound absorption structure to control the reverberation time and the specified frequency characteristics to prevent echo and sound energy concentration. Secondly, in the application of materials, we must also carry out structural reorganization and installation in accordance with strict regulations, and strive to make the acoustic materials do not destroy the original acoustic advantages in application and installation, which can save materials. Therefore, we conduct acoustic model tests during the design phase to predict the effects of the acoustic measures taken. What do you need to know about indoor sound quality? First of all, we have to design an indoor home theater. We must understand the influence of the indoor space and the selected materials on the sound field. In the requirements of the indoor environment, we need to use the "standard" body type as much as possible. The traditional "standard" body type should be rectangular, and the rectangular shape is relatively easy to deal with the circular or polygonal sound field. Acoustics The spread is also relatively easy to calculate. On the other hand, we also need to consider the relationship between the acoustic parameters of the indoor sound field and the subjective listening effect, that is, the subjective evaluation of the sound quality. This is also an extremely important link. It can be said that the quality of the indoor sound quality is ultimately determined by the subjective audience. Feeling, due to the differences in the personal feelings and appreciation of the general audience, the inconsistency in subjective evaluation is one of the important links in the performance of indoor sound quality. Diffusion acoustic treatment, we should consider the diffusion of the environment before the indoor environment to do the sound absorption treatment design. Reasonable diffusion acoustics can make the sound performance more balanced, to improve the uniformity of the direct sound and improve the sound field performance. We can also deal with manual delay, artificial reverberation and other measures through the later equipment adjustment. Combined with the indoor diffusion acoustics treatment has become an important part of the home theater environment, which deserves further study. Reasonable sound absorption processing, whether it is home theater design or hall design, it involves the sound absorption part, so the application of sound absorption and the application of sound absorbing materials are also very important. Even if there is good indoor sound quality design, if it is seriously disturbed by noise, It will also destroy the entire listening environment. In order to ensure the playing of indoor movies and the normal life of the outside world, it is necessary for us to cut off the sound in the room. On the contrary, if we control the outside world to enter the room, we can have a better viewing environment. interference. Acoustic materials control noise interference In the solution of noise, we can use some sound-absorbing panels, sound-absorbing cotton or a certain frequency band that uses the resonance principle to cancel the sound, and block the sound bridge, so that the noise of the entire cinema environment is affected by external noise. Noise is to control the noise within an appropriate range according to actual needs and possibilities. For home theater, we also control the noise to a reasonable standard value, and can not be "completely" cut off. The first thing to solve in a quality home theater environment is its noise barrier and the application of acoustic materials. Reasonable calculation and application of building acoustic materials can not only create a comfortable viewing environment, but also make the sound more realistic and natural. More fresh and fun home theater information, please pay attention to home theater network (WeChat: cnhifi) http://, the country's most influential home theater audio player interactive media website. Incremental Encoder is commonly used, and Absolute Encoder is used if there are strict requirements on position and zero position. Servo system should be analyzed in detail, depending on the application situation. Commonly used incremental encoder for speed measurement, which can be used for infinite accumulation measurement; Absolute encoder is used for position measurement, and the position is unique (single or multiple turns). Finally, it depends on the application situation and the purpose and requirements to be realized. Incremental Linear Encoders,Linear Optical Encoder,Linear Position Encoder,Encoder Bearing Tester Yuheng Optics Co., Ltd.(Changchun) , https://www.yhencoder.com
