Weak current College】 【acoustic fundamentals (3).

<br> <br> 101. the effects of CHORUS that chorus <br> <br> 102. the acoustic disturbance caused by changes in local pressure medium, is called sound pressure <br> <br> 103. the sound pressure level in .dB per unit for the <br> <br> 104. the sound level of the unit for dB <br> <br> 105. the sound pressure units (PHA) Pa <br> <br> 106. the intensity of the unit .is w / m & sup2; <br> <br> 107. the hearing threshold of sound pressure of about 2 × 10-5Pa <br> <br> 108. the pain threshold of sound pressure of about 2 × 10Pa <br .> <br> 109. the pain threshold of sound pressure level of about 120dB <br> <br> 110. the sound pressure level hearing threshold around 0dB <br> <br> 111. a concave surfaces on Sonic form concentrated reflection, make .sound energy on point or an area, known as sound focus <br> <br> 112. the convex surface reflex for Sonic, the Sonic can form diffusion <br> <br> 113. the ear-resolved two sound minimum interval is 50ms .<br> <br> 114. the rhythm of music in vocal and instrumental music <br> <br> 115. in music musical notation 1 - ⅰ called octave <br> <br> 116. indoor mixed noise is caused by reflections .<br> <br> 117. the basic tone elevated chromatic called l, use # notation <br> <br> 118. the basic tone reduce chromatic called falling tone, notation with b <br> <br> 119. a raise or .lower the tone you want to become the fundamental tone is restored, use po notation <br> <br> 120.MIDI mean musical instrument digital interface <br> <br> 121. the sound source in the distance is greater than a certain value .of two parallel interface between reflection and formation of a series of ECHO, ECHO, called fibrillation <br> <br> 122. the sound pressure and base pressure (2 × 10-5Pa) ratio, 10 logarithm multiplied by 20, known as the .sound pressure level <br> <br> 123. the music of sound mostly compound codes <br> <br> 124. the early reflections means indoors only after a time of reflection, to listen to the ears of reflections <br> <br .> 125. music seven basic tone <br> <br> 126. the commonly used two sound-absorbing materials: porous materials, sheet, leaving the cavity after <br> <br> 127. it does not belong to the sound structure: .perforated plate <br> <br> 128. belongs to the sound structure: double brick wall <br> <br> 129. due to change of indoor frequency response, so that the original signal spectrum with some changes, known as the acoustic colouring .<br> <br> 130. do not belong to the porous sound absorption material shake: gypsum board <br> <br> 131. belongs to the porous rock wool acoustic materials: <br> <br> 132. thin resonance-absorbing .structure features low frequency sound absorption properties, it also contributes to the diffusion of sound waves <br> <br> 133. the wood is fixed to the frame, plate and leave after a certain air layer, can constitute a thin resonance absorption structure < .br> <br> 134. the recording record birdsong is on the tree, so playing 0.01Pa sound recording is 1Pa, two sound comparable to 40dB <br> <br> 135. the mixed sound can prolong the duration of the voice, to .improve the sound richness <br> <br> 136. the two sources of the same frequency or similar, the superposition of waves meet, it is likely to produce a wave interference <br> <br> 137. the two on the same straight .line along the wave propagation in the opposite direction, the same as if the amplitude, frequency, in two-wave source line will appear in the wave <br> <br> 138. the use of language and Music Hall total noise-level indicators .for NR30 <br> <br> 139. the arrival of General noise level level indicators for Eclipse] [A 40dB <br> <br> 140. Interior of acoustic focusing on sound field uneven impact because indoor exist concave reflector <br> < .br> 141. indoor listen there dead point, is the result of sound sources produce interference or formation of standing wave <br> <br> 142. the audiovisual area means indoors did not hear the sound of region nonstop <br> <br> .143. the objects of the sound transmission loss R and thickness, and its surface structure and density of the <br> <br> 144. in the concave surface laying sufficient absorption material and can solve the drawbacks of sound focus <br> <br .> 145. adjusting speaker location or additional premium Acoustic speakers can address the defects in the audiovisual area <br> <br> 146. the back wall and strong absorption or convex diffuser, can solve the long delay echoes of defects <br> <br .> 147. the two sides parallel wall surface diffusion or change parallel perspective, can solve the fibrillation of defects <br> <br> 148. a capacitor microphone's high pressure level as 126dB, equivalent noise level to 20dB, its dynamic range is 106dB < .br> <br> 149. the audio of the high frequency band decided to voice, the clarity of the luminance <br> <br> 150. the audio of high frequency sound color decision.