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The HAL System of DSP for installed audio by Rane. The Rane EXP7x Expander for the HAL1x provides 8 channels of full- featured, drag and drop Acoustic Echo Cancellation (AEC). Each channel of AEC can be added to any HAL1x system input and route to any Halogen DSP block, including the gain- sharing automixer, manual mixer, regular Room Combine block, and Conference Room Combine block. Included are the Multichannel Shelving Filter, Multichannel PEQ, Tracking Ambient Noise Compensation and Tracking Side- chain Compressor.

Each AEC channel includes: Mic and Reference Inputs with Level control & metering. AEC on/off, plus adjustable AEC Threshold. Soft / loud talker AGC & 5- band parametric EQ, plus high- and low- cut filters.

Full bandwidth AEC with adjustable non- linear processing. Ambient Noise Reduction (dynamic & steady- state) & howling prevention.

Complete metering: Input, Reference, Echo Return Loss (ERL), Echo Return Loss Enhancement (ERLE) & Total Echo Return Loss (TER). Hz Bandwidth, 3. 00 ms tail length.< 1. B/sec convergence rate. Because EXP7x AEC channels are not associated with a particular hardware input, preset recall can re- assign an AEC resource across inputs / rooms as required. Drag and drop AEC supports the typical one- AEC- per- microphone configuration. With optimum acoustics, mic and loudspeaker placement, or with rarely used mics (such as audience mics) it allows mixing more than one mic into a single AEC channel, significantly reducing cost.

What's unique about HAL’s AEC? Flexible drag- and- drop AEC placement. This block is useful when more than one room must share a single Vo. IP or Video Conference resource.

It’s also useful when a room needs to access one or more remote rooms on a campus in order to include them in a conference. In some cases a combination of these scenarios is required. The function of the Conference Switchboard could be accomplished using a standard matrix mixer, but that would require a user to avoid disallowed routing (like 1: 1 or 2: 2 etc.), and ensure that To and From Far End pairs are correctly wired. This Conference Switchboard simplifies the process. Conference Room Combine Block.

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Conferencing in a room combine environment is a complex task without a specialized Room Combine Processor designed to handle room mix, far- end mix and AEC reference routing. Halogen's unique ability to do conferencing within a room combine scenario without complex wiring and routing makes it easy. Multi- Channel Processing Blocks. In order to get the best performance from an AEC application, the same signal processing parameters used to feed a room loudspeaker must be applied to the AEC reference signal as well. To simplify this process, special blocks that mirror the processing for room and reference channels include: Tracking Compressor Tracking ANC Multi- Channel PEQMulti- Channel Shelf. Halogen provides a highly integrated Conference Room Combine block that greatly simplifies conferencing in a room combine configuration.

The block combines room sources, selects a proper reference, and sends audio to appropriate locations as rooms combine. It also provides support for maintaining a proper AEC Reference with local Voice Lift. This block supports unique mixes from Record and Room outputs.

An independent AEC Reference Output is provided for each room to accommodate various microphone locations and unique room processing outside the Conference Room Combine block. A boardroom application has a number of microphones with overhead sound reinforcement.

In this type of system, sound reinforcement is typically strengthened and delay compensation added as a loudspeaker gets further from the original source. In this scenario, if room acoustics are good, it is possible to use a single AEC processing block for more than one microphone by combining microphones in a common reinforcement zone. The drag- and- drop flexibility of EXP7x AEC blocks lets you add AEC to any Halogen system input. In the drawing below, the red lines are the daisy- chained CAT5 expansion bus, the blue lines are CAT 5 to RADs from the HAL1x and EXP1x RAD Expander, and the yellow lines are shielded mic cable to analog inputs on the RADs, EXP5x Input Expander, and HAL1x. A complete description of a boardroom application is here.