【 Weak current College 】 audio equipment and system knowledge (4)

<br> <br> <br> 151. the primary function of noise gate is multi-channel microphone automatically close when you are working without the normal signal input microphone <br> <br> 152. the feedback suppressor's main function is to suppress .the acoustic feedback whistling <br> <br> 153. the primary function of moving the prescaler is suppression system of acoustic feedback whistling <br> <br> 154. Dolby noise reduction circuit's main function is to eliminate background noise tape recorder <br> .<br> 155. Cone Speaker playback characteristics, ideal for high, medium, low, more suitable for medium and low frequency playback <br> <br> 156. the Horn speaker playback characteristics suitable for medium and high frequency, more suitable for high .frequency playback <br> <br> 157. ball loudspeaker playback characteristics, suitable for small power, high frequency playback <br> <br> 158. Cone Speaker features a sensitivity of medium, transient characteristics of a medium, power can be very large .<br> <br> 159. Horn loudspeakers are chiefly characterized by high sensitivity and point to strong, power medium <br> <br> 160. ball loudspeaker features a sensitivity is low, the power of small, transient characteristics of good <br .> <br> 161. the e-modulus prescaler is characterized by the amplifier level, frequency spectrum of the signal received after power amplifier <br> <br> 162. the power divider is characterized by after the amplifier level, frequency spectrum of the .signal received the speakers after the <br> <br> 163. e divider basic structure mainly by RC filter circuit, also called active crossover <br> <br> 164. the power divider basic structure is mainly composed of inductance, capacitance and resistance ., also known as passive crossover <br> <br> First-second frequency 165.LC circuit calculation formula for L = C = <br> <br> 166.LC second order calculation of second crossover circuit is L = C = <br .> <br> 167. an order-frequency circuit of frequency characteristics to-6dB/oct <br> <br> 168. the second sub-type bian back to El-Dyke gear to Halo? 2dB/oct <br> <br .> 169. the speaker sound or sound interference is the speaker cone and Sonic cancel each other out, making sound pressure decrease <br> <br> 170. avoid speaker sound interference would be to turn the speaker cone and separated with baffle or place the .speakers mounted on the speakers in the <br> <br> 171. the acoustic phenomenon mainly exist in short circuit, Woofer <br> <br> 172. the speaker phase hole in the main role is to use the speakers on the back of .the comic wave, phase and radiation into space <br> <br> 173. the narrow strip of phonological and pillar of radiation characteristics of the upper and lower vertical plane directivity is narrow, horizontal directivity wide <br> <br> 174. allweather .directivity and its length and frequency of the sound column length or is the higher the frequency, the stronger its directivity <br> <br> 175.U frequency wireless microphone features a stable performance, strong anti-interference ability, the number may be more .work, but at higher prices <br> <br> 176.V frequency wireless microphone features a stable performance, should not be more than one at work, less expensive <br> <br> 177. the moving coil microphone features solid and durable ., without power, suitable for solo and wind instruments <br> <br> 178. the main features of the capacitor microphone is the treble and transient characteristics of a good, plus power, suitable for chorus, Conference <br> <br> 179 .. fixed session, choose more often Gooseneck microphone capacitance cable <br> <br> 180. the relative retention of instrumental songs or choose more often handheld dynamic or capacitor wired microphone <br> <br> 181. the location of the meeting, choose .more often leading wireless microphone clamp capacitor <br> <br> 182. sing and dance performances, choose more often headset dynamic or capacitor wireless microphone <br> <br> 183. professional audio features power, sound pressure level is high, for larger .sites <br> <br> 184. home audio features power is relatively small, sound pressure level is low, for smaller venues <br> <br> 185. the main indoor sound quality is good or bad sound reinforcement and the two major factors ., namely sound amplifying equipment and sound environment <br> <br> 186. the effects of CHORUS that chorus <br> <br> 187. the results for that banded FLANGE <br> <br> 188. the use of language and music .auditoria system level specification requirements for maximum sound pressure level for ≥ 98dB <br> <br> 189. singing sound reinforcement system level specification requirements 0.125 --- 4KHZ sound transmission of to ≥-8dB of gain <br> <br> 190. .the effects of FREEZE that freeze <br> <br> 191. the effects of TREMOLO said vibrato <br> <br> 192. the use of language and music auditoria system level specification requirements 0.125-4kHz of acoustic gain to ≥-8dB < .br> <br> The plug 193.MIDI interface is 5-wire plug <br> <br> 194. the nominal rated load impedance 8 Ω for the power amplifier with a nominal impedance 4 Ω speaker connections, called overloaded with <br> .<br> 195. the binary code is 0 and 1 <br> <br> 196. mixer GainAdjust said gain adjustment in <br> <br> 197. the disco Hall sound reinforcement system level specification requirements for maximum sound pressure level for ≥ .110dB <br> <br> 198. the compression THRESHOLD expressed in the play control threshold <br> <br> 199. karaoke singing sound reinforcement system level specification requirements 1K, 6.3KHZ sound field not uniformity ≤ 8dB <br> <br> .200. wipe wipe with alternating magnetic audio sound current, which frequency is significantly higher than the highest frequency audio <br> <br> 201. the tape recording was the use of tape recorded sounds of remanent magnetization curveBR> <br> 202. the .tape recording of sound the highest frequency signal is 20KHz <br> <br> 203. the audio tape erase with the alternating current is fixed <br> <br> 204. the use of AC biasing records sound signal of dynamic range than the DC .bias magnetic recording acoustic signal wide dynamic range <br> <br> 205. the recording head gap g fixed, record sound signal limit frequency and tape speed proportional relationship <br> <br> 206. the sound intensity and sound pressure is the square .<br> <br> <br>.