【MAXUS】Beats 比稿方案-20170412-142P

中小学多功能报告厅设计规范篇一：学校报告厅方案设计V1深圳市美中学校报告厅多媒体音视频设计方案20XX年01月06日目录目录 ................................................ .. (1)前言 ................................................ .. (3)第一章项目设计概述 ................................................ .. (4)项目概述 ................................................ (4)第二章系统设计思路 ................................................ .. (4)系统设计依据 ................................................ (4)系统设计原则 ................................................ (4)设计标准规范、安全要求 (5)第三章项目设计方案详述 (6)250平米多功能报告厅 (6).1 场地概述 ................................................ . (6).2 设计简述 ................................................ (6)第四章选型产品技术参数详述 (7)扩声系统 ................................................ (7).1 主音箱 ................................................ .. (7).2 辅助音箱 ................................................ (8).3 超重低音音箱 (9).4 D类数字功放 (9)数字调音台 .................................................10数字信号处理器 (11)时序电源器 .................................................12手持无线话筒...............................................12头戴无线话筒...............................................13鹅颈话筒 ................................................ (13)、视频显示部分 ................................................ . (13)投影机 ................................................ (13)幕布 ................................................ .. (14)、舞台灯光部分 ................................................ (14)前言随着信息技术的不断发展。

Monolithic Linear ICOrdering number:ENN1164CSANYO Electric Co.,Ltd. Semiconductor CompanyTOKYO OFFICE T okyo Bldg., 1-10, 1 Chome, Ueno, T aito-ku, TOKYO, 110-8534 JAPANPackage Dimensionsunit:mmFeatures• Low idling current (20mA/2 channels) enabling prolonged battery life.• Less dependence of idling current on V CC .• High power (5.3W typ. ×2).• High ripple rejection (60dB at steady state).Since filters are arranged in 3 stages (including 1 stage inside the IC) to attain satisfactory ripple rejection at tran-sient state, ripple occuring at the time of motor start can be prevented from mixing in.• Low pop noise at the time of power supply ON/OFF and good starting balance between both channels (0.6s.) due to built-in pop noise limiter.• Pins provided for compensating high frequency responce.• Low residual noise (0.4mV).• Wide supply voltage range (6 to 24V) fascilitating design of transformer power supply.• Built-in thermal shutdown circuit,• Designed so that inverse insertion or short between adja-cent pins causes no destruction.• Channel-to channel mirror image pin assignment and pro-vision of Pre GND, Power GND pins enabling stable op-eration and fascilitating artwork of printed circuit board.• Minimum number of external parts required (9pcs. min.,12pcs. typ.).• Audio muting capability (for automatic music selection,electronic tuner).SpecificationsAbsolute Maximum Ratings at Ta = 25˚C˚C ˚Cre t e m a r a P l o b m y S sn o i t i d n o C sg n i t a R t i n U e g a t l o v y l p p u s m u m i x a M V C C xa m 42V t n e r r u c t u p t u o m u m i x a M I O ka e p le n n a h c 15.2A n o i t a p i s s i d r e w o p e l b a w o l l A x a m d P kn i s t a e h e t i n i f n i h t i W 51We r u t a r e p m e t g n i t a r e p O r p o T 57+o t 02–er u t a r e p m e t e g a r o t S gt s T 051+o t 04–Sample Application Circuit 1Description of External PartsC1 (C1)Feedback capacitorsRelated to low roll-off frequency f L for –3dB (100µF, f L=60Hz).A capacitance value of 47µF to 100µF is recommended. Increasing the capacitance value makes thestarting time (t s) later. Decreasing the capacitance value makes the starting time (t s) earlier.C3 (C4)Bootstrap capacitorsDecreasing the capacitance value lowers output at low frequencies. A capacitance value of 47µF to100µF is recommended.C5 (C6)Oscillation blocking capacitorsPolyester film capacitor, being excellent in temperature characteristic, frequency characteristics, isrecommended.C7 (C8)Output capacitorsRelated to low roll-off frequency and output at low frequencies. BTL applications normally requireoutput capacitors.C9 (C10)Switching distortion compensating capacitorsCompensates switching distortion which occurs at a high frequency of 10kHz. Ceramic capacitor of0.01µF is recommended. If no problem arises in terms of radio-casette recorder design or tone, it isunnecessary to use these capacitors.C11Filter capacitor (A)Ripple filter circuit provided in power supply line. A capacitance value of 220µF is recommended.Ripple rejection SVRR starts to be saturated at 47µF. The starting time and pop noise generated at thetime of power supply ON must be considered when fixing the capacitance value. A capacitance value of100µF to 220µF is usable.C12Filter capacitor (B)Ripple filter circuit provided in bias circuit. A capacitance value of 100µF is recommended. 3V sufficesthe breakdown voltage of this capacitor. This capacitor is for ripple rejection at transient state and rejectsnoise “buzz” generated when the above-mentioned filter circuit provided in power supply line is satu-rated due to large ripple and supply voltage drop induced at the time of start of the motor connected topower supply line. If the motor is satisfactory in performance and the power supply regulation includingripple is 500mVrms or less, it is unnecessary to use this capacitor. If noise “buzz” is not offensive to theear, it is unnecessary to use this capacitor. In this case, other basic performances are not affected ad-versely.Feaures of IC Contents and Functions of Other Pins(a)Since the input circuit uses PNP transistors and the bias voltage is set nearly equal to 0, no input couplingcapacitor is required, thereby enabling direct coupling. However, if slider contact noise of the variable resistor presents any problem, connect a capacitor in series with input.(b)Various ideas embodied in the idling circuit enable reduced I CCO and prolonged battery life. Since the non-operating level of the idling circuit is made equal to that of the amplifier, crossover distortion does not worsen at the time of reduced voltage.(c)The open loop voltage gain is lowered and the negative feedback amount is made small to assure stable opera-tion. Radiation to the radio-frequency stage is made less by soft clipping.(d)Capacitors for oscillation compensation are contained as a means of reducing the number of external parts.10pF×2 and 2pF×2 are used. Hig roll-off frequency f H (–3dB point) depends on these capacitance values.(f H=28kHz)(e)A thermal shutdown (THD) circuit is contained to prevent the IC from being destroyed by abromal heat genera-tion attributable to insufficient heat dissipation. Pin (11) is used as THD control pin. Biasing pin (11) externally makes the operating temperature lower ; and connecting a resister across pin (11) and (10) makes the operating temperature higher. If pin (11) is connected to GND, the thermal shutdown circuit stops operating.(f)The pin assignment is carefully considered so that no destruction takes place even if power supply is applied at astate where adjacent pins are shorted by solder bridge, etc. Even 180°C-rotated insertion causes no destruction.(g)Collector pins (5), (16) and base pins (6), (15) for predrive can be conveniently used in applications. For oscilla-tion compensation occuring when operated at a lowered gain, connect a capacitor across the pins (4) and (6) anda capacitor across pins (15) and (16). For fH compensation occuring when operated at a lowered gain, connect acapacitor across pins (4) and (6) and a capacitor across pins (17) and (15). Further soft clippling and prevention of waveform distortion at high frequencies are attained by connecting a series circuit of diode (DS442) andresistor (10kΩ) across pin (6) and GND and the same across pin (15) and GND.Continued on next page.Continued from preceding page.(h)Feedback resistance R NF is contained and the voltage gain is fixed at 50dB so that the variations in the voltagegain can be minimized. The gain can be lowered by connecting R NF externally.(i)Biasing pin (12) as shown below causes DC audio muting to be applied, thereby cutting off the IC. This makesattack time, recovery time, pop noise, etc. saticefactory.It is recommended that the following method be used to control the NF pin.It is recommended that the following method be used to control the NF pin.Sample Application Circuit 2Output power (reference value) corresponding to supply voltage and load resistance.me t s yS R L V9V21V51V81o e r e t S 8Ω6Ω4Ω3Ω2ΩW4.1W8.1W4.2W0.3W5.3W5.2W2.3W5.4W3.5–W0.4W0.5W9.6W8.7–W6.5W4.7W8.9––e g d i r B 8Ω6Ω4ΩW5.4W5.5W0.7W5.8W5.9–W31W51–W81––(THD=10%)。