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7925 Dual HD Downconverter
- - Two HD downconverters on one module
- - Accepts asychronous HD inputs
- - Each channel has SD SDI and/or composite outputs
- - HD loop-back outputs
- - Downconverts 720p, 1080i, 1080sF or 1080p to SD
- - Passes SD 525 or 625 if received on input
- - Reference input
- - Outputs can be locked and timed to reference for use with switchers and routers
- - Internal processing in progressive
- - Proc Amp and Frame Sync
- - Built-in test pattern and tone
- - Supports WSS and AFD
- - Translates HD closed captioning to SD closed captioning
- - Passes 16 channels of embedded audio
- - 2 channels of analog audio for monitoring
- - Auto detection of input standard and frame rate
- - Local and remote control
The 7925 module is a two-channel, dual downconverter with HD and SD outputs that can be used in the most demanding broadcast applications. With two downconverters on one module, the 7925 provides high efficiency with excellent picture quality. The downconverted outputs are timeable with respect to the reference input and can feed production switchers and routers.
The 7925 accepts 720p, 1080i, 1080sF and 1080p inputs that are synchronous or asynchronous. If an SD SDI input is received, SD is passed to the output.
Motion-adaptive deinterlacing of the video signal enables all internal processing to occur in progressive.
The 7925 performs automatic color space and gamma conversion to accommodate the differences between HD and SD. The Aspect Ratio Conversion process offers resizing and repositioning with choices for: Letterbox, Anamorphic, Crop and Zoom.
Proc amp controls are provided in the form of Video, Chroma and Pedestal. Video outputs can be timed with respect to the reference input.
The 7925 supports 16 channels of embedded audio (without the need for any sub module). Embedded audio in the input is safely bypassed around the video processing, delayed to preserve lip sync, and reembedded in the SD SDI output. Any two of those audio channels can be selected for conversion to analog form. These balanced outputs can be used with the composite video output to feed analog equipment, or for signal monitoring. All audio processing and conversion is performed at full 24 bit resolution.
The 7925 can be configured locally or controlled and configured remotely with Avenue Touch Screens, Express Panels, or Avenue PC Software. Alarm generation, configurable user levels, module lock-out, and customizable menus are just some of the tools included in the Avenue control system.
HD closed captioning is carried in data packets in the vertical interval ancillary data space. The 7925 properly translates HD caption data to traditional SD captioning (line 21 or 23) so that closed captioning content is converted transparently between video standards and formats.
Automatic Aspect Ratio Conversion
The 7925 uses WSS (Wide Screen Signaling) and AFD (Active Format Description) to mark or identify the aspect ratio of the video content. These flags are read at the input of the module to determine the type of Aspect Ratio Conversion to perform. Subsequently, these flags are properly updated in the output signal to reflect its format and presentation.
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