Assessments - 6, GPA: 4.2
(
)
)
|
Facilidade de uso
website. ...............................................................................22 9341 User Manual • •••• (V 1.0) Page 5 of 22 Introduction In This Chapter This chapter includes the following sections: • A Word of Thanks • Overview • Functional Block Diagram • Features • Documentation Terms A Word of Thanks Congratulations on choosing the openGear. 9341 Analog Audio to AES Converter. The 9341 is part of a full line of modular conversion gear for broadcast TV environments. The Cobalt Digital openGear. line includes video decoders and encoders, audio embeders and de-embeders, distribution amplifiers, format converters, and much more. Cobalt openGear. modular conversion gear will meet your signal conversion needs now and well into the future. Should you have questions pertaining to the installation or operation of your 9341, please contact us at the numbers listed on the back cover of this manual. We are happy to help with any questions regarding this or any other openGear. card. Overview The 9341 is a high quality A to D converter capable of converting up to 8 channels of analog audio into four pairs of AES audio. Analog audio is differential input and sampled at 48 kHz with 0 dbFS digital equivalent to a +24 dBu analog. Beyond analog to digital conversion, the 9341 can also provide AES audio routing. Any of the 8 analog audio inputs can be mapped to any of the 8 AES audio outputs. The gain and phase can also be adjusted on any of the audio channels. All card configuration is done with a simple front panel menu. There is a four character text display to view and control parameters, and a toggle switch and two buttons to navigate the menu. Page 6 of 22 9341 Owner’s Manual • •••• (V 1.0) Supported Audio Formats Discrete AES Audio Output The 9341 can emit 8 channels (4 pairs) of discrete AES audio on 75 ohm BNC connections. The output clock rate of each pair is precisely locked, and derived from the input AES, or the frame reference. Inputs and Outputs The input and outputs of the 9341 are the following: Inputs: 8 Analog Audio differential Outputs: 4 dedicated AES pair output connections. (AES channels 1-8) Signal Timing The input AES audio rate must be 48 kHz (± 1%) nominally. There are sample rate converters on each input that allow the use of asynchronous sources, but the rate must be 48kHz. The output clock rate will be 48 kHz as defined by the AES input, or the frame video reference, depending on user selection. In the case where DARS input is selected as the reference, the timing will be taken from BNC 10. Consequently, to slave the output timing to a DARS audio reference, simply connect it to BNC #10 and all other inputs will be re-sampled to match that channel. To match the output audio clock to a video reference, select the frame reference (“Reference 1” or “Reference 2”). The card will automatically detect any black burst or tri level format (NTSC, PAL, 1080i, 720p) and generate a 48 kHz output clock accordingly. 9341 User Manual • •••• (V 1.0) Page 7 of 22 Functional Block Diagram This section describes the basic operation of your 9341 product. Analog to Digital Conversion Audio Control: 8 Analog Routing AES Encode 4 pairs Audio Gain 8 channels Channels Polarity 9341 Block Diagram Figure 1. Simplified Block Diagram of 9341 Functions Differential analog audio signals are received on the input phoenix connectors. AES audio is sample rate converted to match the selected clock source. AES routing, gain, and polarity are then applied. Documentation Terms The following terms are used throughout this guide: • “Frame” refers to the 8310 frame that houses the 9341 card. • “Operator” and “User” both refer to the person who uses the 9341. • “Board” and “Card” all refer to the 9341 card itself, including all components and switches. • “System” and “Video system” refers to the mix of interconnected production and terminal equipment in which the 9341 operates. Page 8 of 22 9341 Owner’s Manual • •••• (V 1.0) Installation and Setup In This Chapter This chapter includes the following sections: • Static Discharge • Unpacking • Rear Module Installation (Optional) • Board Installation • Card Control and Status Static Discharge Whenever handling the card and other related equipment, please observe all static discharge precautions as described in the following note: Static discharge can cause serious damage to sensitive semiconductor devices. Avoid handling circuit boards in high static environments such as carpeted areas, and when wearing synthetic fiber clothing. Always exercise proper grounding precautions when working on circuit boards and related equipment. ESD Susceptibility Unpacking Unpack each card you received from the shipping container, and check the contents against the packing list to ensure that all items are included. If any items are missing or damaged, contact your sales representative or Cobalt Digital directly. 9341 User Manual • •••• (V 1.0) Page 9 of 22 Rear Module Installation (Optional) I...