WiSA Publishes a White Paper Defining Its Charter

WiSA White Paper on Interference-Free Uncompromised Audio.
Updated November 4, 2013

Installation
The Wireless Speaker and Audio Association has developed WiSA standards for wireless surround sound. Speaker manufacturers who adhere to these standards will be able to participate in any wireless surround sound implementation supplying some or all of the wireless components required.

The WiSA™ Association is an industry group headquartered in Silicon Valley dedicated to fostering the adoption of Wireless Speaker & Audio (WiSA) technology through interoperability testing and market-building activities worldwide.

The keyword is "interoperability". The key benefit to homeowners is the ability to mix and match WiSA certified components from the manufacturer of your choice to create a fully interoperable home theater surround sound system. The all-wireless system means you have full flexibility to place the components anywhere in the room, limited only by the length of the power cords, and no speaker wires to contend with.

The engineering content within the WiSA specifications has defined a roadmap and key technologies to ensure products designed per their specification will indeed be interoperable and also deliver a superior surround sound experience by eliminating wireless signal interference from the usual sources that have plagued the 2.4 Ghz radio band where WiFi, Bluetooth, baby monitors, microwave ovens and Control4 systems operate.

Instead the WiSA white paper explains frequencies opened up within the international unlicensed (U-NII) 5 Ghz radio band (shown below) that require Dynamic Frequency Selection (DFS) procedures are where the WiSA device transmissions will live. These frequencies were historically reserved for weather and military radar applications, but have recently become available as long as conflicts with existing systems are avoided.

The U-NII band diagram below shows 802.11n WiFi traffic is shown on channels 40-48 and 153-161. However, the DFS channels from 52-140 go mostly unused, leaving plenty of quality space for wireless audio shown on DFS channel 56. 5GHz. Note the transmitter is looking ahead to find the next DFS channel for it to occupy in the event interference is detected.

Installation

    To succeed, wireless sound quality should match the content for best reproduction
    regardless of media, and this is where WiSA compliance draws a line:
    
  • Amplifiers and speakers matched and balanced as a unit – same quality sound
    in all directions
  • 24-bit uncompressed audio – HD Audio quality, perceptibly 50% better than CDs
  • Sample rate that matches the content: 32, 44.1, 48, and 96k samples/sec –
    Realistic sound, 2 times better than CDs, HD Audio quality
  • Rapid error detection and recovery – smooth, uninterrupted sound
  • 5 ms fixed latency – perfect lip synch and game response
  • Under 160ns speaker-to-speaker delay – theatre quality surround experience

Per Aaron Stern of CEPro: "Bang & Olufsen CEO Tue Mantoni literally pulled the covers off of the new products at a media unveiling in Manhattan on Tuesday, Oct. 29, 2013 and hailed the new BeoLab 17, 18 and 19 compact speaker, floorstanding loudspeaker and subwoofer, respectively as groundbreaking in both technological innovation and aesthetic design. All three feature its Immaculate Wireless Sound technology, the company’s name for its WiSA-compliant standard. Built with microchips from Summit Semiconductor, the platform utilizes the 5.2–5.8 GHz range to provide adequate bandwidth to stream 24-bit, uncompressed music at native sampling rates".

To download the WiSA white paper, click here

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