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英国论文代写范文精选-Small room hearing room

2016-06-16 | 来源:51due教员组 | 类别:更多范文

51Due英国论文代写网精选assignment代写范文:“Small room hearing room”,这篇论文讨论了小房间听力室。小房间听力室的声学特征跟大型大厅是明显不同的。房间的大小跟波长是有很大关系的。因此,根据房间的声学特征,设计的时候必须有一个明确的大小。除了一般的声音设计原则之外,也要考虑独特性,以及声音的处理,使听力室具有良好的音响效果。

The listening room is a small room, its acoustic characteristics, and large halls are significantly different. For the room sound quality, the scale of the room close to or at the wavelength of the recording and listening band low-frequency side, a small room.

The acoustic characteristics of the small room to put the audio and sound quality to reduce the impact is significant. Therefore, the room's acoustic characteristics, the design must have a clear difference of the small rooms and large halls. In addition to the general sound design principles, but also consider their uniqueness, and well implemented in the sound processing, so as to make the listening room with good acoustics.

Small room sound quality mainly in the low frequency sound system playback frequency range of the low-end reached 20Hz, but mature auditorium acoustics design techniques only take into account the 125Hz.Therefore, it is necessary to further analysis of the lower band of the acoustic characteristics of well research methods to control its sound quality.

The small room sound field at low frequencies is characterized by strong standing-wave resonance, the transmission response of its rooms, spatial characteristics and temporal characteristics have an impact. The parameters of the corresponding impact sound transmission response, the distribution of indoor sound pressure level and reverberation decay properties of these parameters is determined by the room volume, shape, and side length ratio as well as sound absorption material layout. Often used in a large hall reverberation time to describe the uniform decay of sound energy in the room, small room low frequency reverberation time is closely related to the concept of decay of the low-frequency normal modes, it is not the reverberation time of the original concept, but the classic mixed project extended reverberation time.

Correctly describe the low-frequency attenuation of the small room should adopt the concept of fluctuations in the description of each normal modes decay. The room volume is small, the number of low-frequency simple positive wave of each frequency distribution of normal mode uneven, the normal mode damping, its decay rate is also different, therefore, two adjacent frequency of simple positive wave in the decay process will produce interference effects.

Sometimes hear the original excitation frequency of the room adjacent to the normal mode of decay rather than the decay of the original sound signal. The listening room is usually required to ensure that the conditions of speech intelligibility, hope the sound rounded, plump. Order to meet the requirements of the reverberation time, room acoustic treatment, namely the laying of different types of sound-absorbing material and sound absorbing structure in different locations.

Sound processing materials should be used to make the best of indoor sound absorption structure of the distribution of both acoustic and architectural requirements. The volume of the listening room is always conducive to sound quality, conducive to weaken the low-frequency resonance adverse effects.

For example, the listening room volume high quality requirements to take 160m3 intermediate frequency reverberation time for ,the interior noise level requirements 35dB-40dB, this time in the listening room listening is still a good lower limit frequency of about 100Hz.

For a given room L = 6.0m, B = 4.31m, H = 2.87m, you can know L: B: H = 1.392:1:0.666, unable to meet 1.618:1:0.618 can take to add partitions in the form of housing the proportion of human division 1.618:1:0.618, L = 6.0m, B = 3.71m, H = 2.29m. Interval space for the equipment room.

To set the volume of the room and side length ratio, the need for the calculation of the reverberation time. Usually before the acoustic treatment. The reverberation time is rather long and, therefore, to estimate in advance to expect from the reverberation time as a basis for the acoustic treatment.

As the listening room does not meet the export conditions of the reverberation time calculation formula, the calculation does not require precise, and can usually be calculated and measured use. In the construction process, the measurement results to adjust the acoustic treatment and correction of the calculated value, many times repeated, you can get the desired reverberation time and its frequency characteristics. Calculate the reverberation time can be used the following simplified formula: , calculated reverberation time is 0.42s, to meet the design requirements.

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