"魔术大师"--AMS Neve Logic MMC 数字调音台

Logic MMC是AMS Neve公司最新推出的一款数字调音台,其功能灵活多样,主要用于专业音乐节目实况和后期录制及影视后期制作、电视广告、DVD的5.1环绕声录音等。有趣的是,这款全数字调音台却有如同模拟调音台一样的操作台面,因此倍受世界各国录音师们的欢迎。这款调音台目前可以按所需不同提供18路、24路、30路、36路和48路推子的标准配置,如需要,最多可配置66个推子。Logic MMC数字调音台是Logic 2的后一代产品,它采用紧凑的结构,吸收了AMS Neve DFC(数字影片调音台)的很多特性,使之更易于操作。MMC不仅具有符合人机工程学的控制界…     

甘肃台直播间数字化改造

本文阐述了直播间调音台的选择、功能及应用。     

ENG的最佳"拍档"--DMX-P01数字便携式调音台

Sony具有从低端到高端全线的视频ENG/EFP产品,出色的视频特性急需有配套的优秀的音频产品能够方便大家的外出前期采集需要。因为即使视频品质极佳,若声音表现平平,则制作出的节目也会大失光彩。已经有越来越多的视频专业人士已经注意到了这一点。经常接到客户的电话,询问Sony有没有外出采访用的调音台。现在可以肯定的告诉大家:Sony有这样的便携式调音台,而且还是数字的!今年在NAB03上,Sony公司正式发表展示了第一款数字便携式调音台DMX-P01。机身简约小巧,功能齐全实用。DMX-P01数字便携式调音台的推出,正是对这样高品质音频需求…     

确定调音台输入增益的常用方法

本文从实践和理论两方面阐述了设置调音台输入增益的正确方法，其中详细讨论了声源、话筒、调音台技术指标之间的相互关系。对广播电视领域的音频制作人员有较强的指导意义。     

调音台功能和音响系统设计

随着经济的迅速发展以及科学技术水平的不断提高,我国的调音台技术取得了巨大的发展。它的应用范围越来越广。我们研究的课题是:调音台功能和音响系统设计。我们主要对模拟调音台进行了一定程度上的介绍,具体针对其功能以及用法进行详细阐述。除此之外,我们还以电视节目现场直播和影视剧录音合成作为具体实例,进行了对于相应的音响系统的介绍,重点介绍其设计的构造以及相关应用。     

调音台的发展历程

从索尼的John East调音台到Antony David调音台,近60年来有关调音台的生产和技术进步,记录了调音台发展的历程。     

浅谈小型电台如何实现现场直播

介绍了小型广播电台现场直播的传播方式,及其天线、发射机、现场调音台和周边设备的选择,并阐述了现场直播时应该注意的问题及建议.     

浅谈转播车音频系统设计改造

本文介绍了江苏省广播电视总台汤姆逊高清转播车音频系统的改造,阐述了包括改造规划、数字调音台的选型、设备布局、集成安装以及配电安全等诸方面.     

北京冬奥会雪上项目声音呈现之制作特点和混音理念

本文解析了北京冬奥会雪上技巧、平行大回转、U型池和空中技巧公共信号制作要求,阐述了基于制作特点的调音台相关设置和混音理念。     

Mackie Onyx系列4编组演出调音台

Mackie公司的Onyx 24x4,Onyx 32x4模拟信号现场调音台是一款中型调音台,可广泛用于夜总会、乐队演出、教堂等多种场合.Mackie公司的旗舰级产品Onyx 4-Bus系列现场调音台对Mackie SR24.4及32.4调音台作了改进.     

A low-power oscillator mixer in 0.18-/spl mu/m CMOS technology

A downconversion double-balanced oscillator mixer using 0.18-/spl mu/m CMOS technology is proposed in this paper. This oscillator mixer consists of an individual mixer stacked on a voltage-controlled oscillator (VCO). The stacked structure allows entire mixer current to be reused by the VCO cross-coupled pair to reduce the total current consumption of the individual VCO and mixer. Using individual supply voltages and eliminating the tail current source, the stacked topology requires 1.0-V low supply voltage. The oscillator mixer achieves a voltage conversion gain of 10.9 dB at 4.2-GHz RF frequency. The oscillator mixer exhibits a tuning range of 11.5% and a single-sideband noise figure of 14.5 dB. The dc power consumption is 0.2 mW for the mixer and 2.94 mW for the VCO. This oscillator mixer requires a lower supply voltage and achieves a higher operating frequency among recently reported Si-based self-oscillating mixers and mixer oscillators. The mixer in this oscillator mixer also achieves a low power consumption compared with recently reported low-power mixers.     

集成化DAM变频电路设计

介绍了数字阵列雷达中DAM（数字阵列模块）内部的高度集成化的变频电路的设计思想,用于数字阵列雷达的收发变频通道,各项指标均满足系统要求,可达到常规分立元件电路的指标,讲述了采用MCM（多芯片组件）技术,结合电路优化集成设计,将有源变频器芯片、开关等器件集成于金属陶瓷结构的封装内,使得DAM的变频通道集成度得以大幅度提高。     

晶体管混频器混频增益的简化计算

本文介绍一种方法简单、便于学生理解的分析晶体管混频器混频增益的简化计算方法.该方法从晶体管的电流方程入手,通过分析晶体管混频器的混频原理,得到了输出中频电流和混频跨导、混频增益的简明数学表示.通过对典型混频器电路的仿真,验证了该方法的有效性.该方法与传统的时变偏置电压分析方法相比,混频跨导和混频增益容易求得,解决了以往混频跨导基本是一个概念参数而难以确定具体数值的问题.     

2.4 GHz offset-cancelling down-conversion mixer

A down-conversion mixer utilising the offset-cancelling technique increase the carrier-to-noise ratio (CNR) is presented. The proposed offset-cancelling mixer has been fabricated in a 0.35 μm CMOS process and it can convert the 2.4 GHz RF signal to the 280 MHz IF one with 12 mW power consumption including the buffer. Compared with the non-offset-cancelling mixer, the proposed offset-cancelling mixer has the lower noise level. Experimental results show that the offset-cancelling mixer provides 45 dB CNR better than 34 dB CNR of the mixer without the offset-cancelling technique     

Transmission-Type Harmonic Mixers of MM-wave Range

A new kind of harmonic mixer for use in phase locking systems for MM-wave oscillators is presented. The mixer has compact design and combines directional coupler and conventional harmonic mixer in one element. Construction and features of the mixer are discussed. Experimentally measured main characteristics of the mixer are presented. Possibility of continuous frequency scan of phase locked MM-wave oscillator within a full waveguide band is demonstrated.     

A High IIP2 Mixer Enhanced by a New Calibration Technique for Zero-IF Receivers

The second-order intercept point (IP2) performance of direct conversion receivers is limited by the second-order nonlinearity of the mixer. A new technique which is based on calibrating mixer by injecting a programmable nonlinear current into the mixer output is introduced in this paper. The proposed calibration technique can be used in multistandard mixers. A CMOS mixer demonstrating the performance for Universal Mobile Telecommunication System application and working with supplies as low as 1 V is designed in a 65-nm technology. The simulation results show that the mixer IIP2 is improved more than 25 dB while the mixer current consumption is increased less than 1 mA. The calibration circuit is low noise not to affect the mixer noise figure.     

混频二极管及混频器的噪声分析

本文讨论了混频二极管在直流偏置和交流信号激励时的噪声温度比,提出了以“有效噪声温度比(tD)_(eff)”来表征二极管在交流激励下的噪声性能.文中还讨论了在信号及镜像频率的变频损耗不同时混频器输出噪声温度比和二极管噪声温度比的关系.根据分析结果对倒极性并联二极管对的噪声性能作了分析,表明这种复合管的(tD)_(eff)为一常数(0.5).这对降低混频器的系统噪声系数是十分有利的.可以相信:利用倒极性并联二极管对于研制优良性能的毫米波段混频器是一种很有希望的办法.     

Noise in Current-Commutating Passive FET Mixers

Noise in the mixer of zero-IF receivers can compromise the overall receiver sensitivity. The evolution of a passive CMOS mixer based on the knowledge of the physical mechanisms of noise in an active mixer is explained. Qualitative physical models that simply explain the frequency translation of both the flicker and white noise of different FETs in the mixer have been developed. Derived equations have been verified by simulations, and mixer optimization has been explained.      

基于CMOS工艺的改进型电流注入混频器

设计了一种改进型电流注入混频器.通过在吉尔伯特混频器电路的本振开关管源极引入电感形成谐振电路,消除了开关管源极寄生电容的影响,降低了混频器电路的闪烁噪声,增大了混频器电路的增益.混频器电路的设计采用SMIC 0.35 μm CMOS 工艺库,本振功率为-3 dBm.仿真结果表明,与改进前的混频器电路相比,当本振功率为-3 dBm时,改进型电流注入混频器电路的增益提高了1.76 dB,IIP3提高2.1 dBm,噪声系数降低了0.5 dB.     

A 100-element planar Schottky diode grid mixer

The authors present a Schottky diode grid mixer suitable for mixing or detecting quasi-optical signals. The mixer is a planar bow-tie grid structure periodically loaded with diodes. A simple transmission line model is used to predict the reflection coefficient of the grid to a normally incident plane wave. The grid mixer power handling and dynamic range scales as the number of devices in the grid. A 10-GHz 100-element grid mixer has shown an improvement in dynamic range of 16.3 to 19.8 dB over an equivalent single-diode mixer. The conversion loss and noise figure of the grid are equal to those of a conventional mixer. The quasi-optical coupling of the input signals makes the grid mixer suitable for millimeter-wave and submillimeter-wave applications by eliminating waveguide sidewall losses and machining difficulties. The planar property of the grid potentially allows thousands of devices to be integrated monolithically