千叶夜雪 千叶夜雪
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我以经翻译不下去了,求帮助翻译余下一半! 有些电子术语我不才明白,随便看看我译错了那些。 原文以译: FunctionalDescription This sectiondescribes the basic subsystems and applications of the SA575 Compandor. Moretheory of operation on compandors can be found in AND8159 and AND8160. Thetypical applications of the SA575 low voltage compandor in an Expandor (1:2),Compressor (2:1) and Automatic Level Control (ALC) function are explained. These three circuit configurations are shownin Figures 2, 3, and 4 respectively. The SA575 has two channels for a completecompanding system. The left channel, A, can be configured as a 1:2 Expandorwhile the right channel, B, can be configured as either a 2:1 Compressor, a 1:2Expandor or an ALC. Each channel consists of the basic companding buildingblocks of rectifier cell, variable gain cell, summing amplifier and VREFcell. In addition, the SA575 has two additional highperformance uncommitted op amps which can be utilized for application such asfiltering, pre-emphasis/ de-emphasis or buffering. Figure 5 shows the completeschematic for the applications demo board. Channel A is configured as an expandorwhile channel B is configured so that it can be used either as a compressor oras an ALC circuit. The switch, S1,toggles the circuit between compressor and ALC mode. Jumpers J1and J2 canbe used to either include the additional op amps for signal conditioning orexclude them from the signal path. 功能描述 本节描述的基本子系统和应用SA575压缩扩展器。可以找到更多的操作理论压缩扩展器AND8159和AND8160。SA575低压压缩扩展器的典型应用的扩展器(1:2),压缩机(2:1)和自动电平控制(ALC)功能解释。这三个电路配置是图2所示,分别为3和4。SA575有两个渠道,一个完整的压缩系统。左边通道,A,可以配置为1:2扩展器,而右边通道,B,可以配置为2:1压缩机、1:2扩展器或一个ALC。每个通道包括基本压缩扩展结构模块整流器,自动增益器,加法放大器和VREF。此外,SA575有两个高性能未被约束的运算放大器可以用于应用程序,如,如过滤、预加重、去加重或缓冲。图5显示了完整的应用程序演示板示意图。A通道被配置为一个扩展器,而B通道配置,这样就可以使用作为一个压缩机或作为ALC电路。开关S1,压缩机和ALC模式之间的切换电路。跳线J1和J2用于包括附加放大器对信号调节或排除信号路径。 余下未翻译的: Bread boarding space is provided for R1, R2, C1, C2, R10, R11, C10 and C11 so that the response can betailored for each individual need. The components as specified are suitable forthe complete audio spectrum from 20 Hz to 20 kHz. The most common configurationis as a unity gain non-inverting buffer where R1, C1, C2, R10, C10 and C11 are eliminated and R2 and R11 are shorted.Capacitors C3, C5, C8, and C12 are for DC blocking.In systems where the inputs and outputs are AC coupled, these capacitors and resistorscan be eliminated. Capacitors C4 and C9 are for setting the attack and release time constant. C6 is for decoupling andstabilizing the voltage reference circuit. The value of C6 should be such that itwill offer a very low impedance to the lowest frequencies of interest. Toosmall a capacitor will allow supply ripple to modulate the audio path. Thebetter filtered the power supply, the smaller this capacitor can be. R12 provides DC reference voltageto the amplifier of channel B. R6 and R7 provide a DC feedback path for the summing amp of channelB, while C7is ashort-circuit to ground for signals. C14 and C15 are for power supply decoupling. C14 can also be eliminatedif the power supply is well regulated with very low noise and ripple.
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