【 Weak current College 】 environment and sound-Power By 【 China power house network 】

Auditorium of evaluation include subjective and objective aspects, but ultimately depends on whether to meet consumer demands for listening. Such a request on the language and music is not all the same, each has the focus. Is now generally believed that good quality felt mainly has following several aspects:

(A) appropriate loudness
Loudness is the Auditorium listening of the most basic requirements. Language and music requires sufficient loudness, they should be higher than ambient noise, the audience is neither effort nor feel too loud and noisy. For music, than the language required higher loudness.
And loudness closely related objective indicators is the sound pressure level. For language, generally require 60-65dB, signal to noise ratio is not less than 10dB, such as room most of the seats at the sound pressure level does not meet this requirement, you should consider using sound reinforcement system to compensate for the lack of sound pressure levels or increase the signal to noise ratio. For the music, the sound pressure level in between 75--96dB.

(2), reverb (fullness) and sense of clarity has the right balance between
Language and music requires clear sound, but the language requirements are higher, music requires sufficient richness and fullness for language is of secondary importance.
And this is closely related to the physical index is reverberation time. If the room reverberation time is too long, you cause the sharpness decreases; but the reverberation time is too short, it will affect fullness. Therefore, for consisting mainly of music concert hall, chubbiness occupies an important position; whereas the report of the meeting, the language definition Auditorium. In General, to listen to the sound of language as the primary room, such as classrooms, lecture theatre, theatre, the reverberation time is too long to 1s suitable around; to listen to music as the main room, such as concert halls, you want the reverberation time longer, such as 1.5-2s. The best reverb time also and music type and subject matter.

(Iii) have a certain sense of space
The main physical parameters is early to sound energy on early total sound energy ratio and binaural hearing of coherence of indicators. Requirements for the concert hall is the Auditorium of the side wall distance not too large, should be built into the side wall of sound reflectors or reflective plate layout dedicated. The best allows reflections in the two perpendicular to the audience in the face of ear wires into +-(55. +-20. The angle scope reaches) audience. Listen for is in stereo, because this is a sound sense of space is determined by the speaker set with stereo sound treatment provided, the request is in acoustics.

(Iv) has a good tone
Excellent analytical, i.e. low, mid, treble moderate balanced, no distortion.
The main physical parameters is frequency characteristic of reverberation time. Commonly used language definition as the Hall should be a shorter reverb time, and use Ping (or nearly straight) reverberation time frequency characteristics; for Opera and musical performances of the Auditorium, the reverberation time should use a long value, the reverberation time frequency characteristic curve should be straight, in, high frequency and low frequency higher than medium frequency (about 15%-20%), this allows the singing and music rich bass, played the role of the beautification of timbre.

(5) low noise
Outdoor intrusion of noise and the noise of the equipment in the building, especially the air conditioning and refrigeration equipment noise, all have to listen. Continuous noise, particularly the low-frequency noise will cover loose language and music; the noise appears discontinuous breaks of the tranquil atmosphere indoors. Therefore you must try to eliminate the interference and control in the allowed range.