User manual AEA LD2020 WINKIE-BLINKIE STEREO SCOPE

[. . . ] To make successful stereo, it is necessary to capture, preserve, and reproduce these significant differences. There are many techniques employed by recording engineers to create stereophonic illusions, and there are numerous texts where the interested reader can find articles detailing these methods. "Accurate stereo imaging is the foundation for the art of stereo recording. [. . . ] This is another "classic" case, but is one to be avoided whenever possible, because if transmitted in mono, the signals will cancel each other, and no output will result. Because stereo involves sound signals in "real space" the elements of intensity and phase are generally not equal between the two channels: usually there will be some difference in one or both of these characteristics. Phase differences will appear as a divergence from the simple lines shown, for example Figure-1e, which shows still equal signals, but with a phase difference of 90° between them. Once the signal intensities also begin to differ, the display becomes more scrambled, and the familiar Lissajous figures result, as shown in Figures 1-f, g, and h. Note that the directional tendencies of these still bear a resemblance to the in-phase, out-of-phase, and random-phase displays shown earlier. By watching this stereo display, the engineer can easily and quickly "see" the characteristics of the sonic image: whether it is narrow or wide; in or out of phase; properly balanced or weighted to one side or the other. The AEA LD2020 Stereoscope As noted earlier, an oscilloscope is commonly used to display stereo signals. However, a 'scope is often too bulky, heavy, or expensive to be used conveniently in the production environment. Audio Engineering Associates has developed the LD 2020 Stereoscope to meet this need. This portable, battery-operable package, weighing in at less than one pound, is specifically designed to provide a visual monitor of stereo signals. With a minimum of controls and a 400 LED matrix display, it is easy to setup and use any time, anywhere. Two balanced 1/4" jacks and two Sensitivity controls receive the stereo signals. The pushbutton Battery/External power switch selects the powering option, and the L-R/PANorama pushbutton determines the display mode. To setup the display, first generate a monophonic signal at "normal" operating level on both channels of your signal source. Connect the outputs to the two inputs of the LD 2020 and turn the unit on. Use the Sensitivity controls to adjust the size of the display; for best results, these controls should be set about equally. You are now ready to begin monitoring stereo signals. In the L-R mode, the signals will be displayed as shown in Figure-1. However, for a more intuitive interpretation of the way stereo is heard, we have incorporated a PANorama mode. [. . . ] Modular Microphone Positioning System Stereo Microphone Bars Decca Tree Arrays M/S Stereo Processors MS 38 MKII MS 38 Lite Modular Studio Microphone Stands and Booms Since 1981 we've acted as the US agent for Coles Electroacoustics, manufacturers of the 4038 studio ribbon microphone and the 4104B, a "lip" mic for voice-over work in high noise environments. We sell and service the mics and stock spare parts. In North America we represent CB Electronics, a leading worldwide supplier of machine control equipment to the sound-for-film industry. [. . . ]