Duo to demo HD video via UWB
Analog Devices and UWB (ultrawideband) technology vendor Pulse~Link plan this week to demonstrate what they claim is the first real-time compression and wireless transmission of high-definition video in a consumer application.
In a demo at the DisplaySearch HDTV Conference in Beverly Hills, the companies will combine Pulse~Link's CWave (continuous wave) UWB technology and Analog's ADV202 device, which is a hardware implementation of JPEG2000, a wavelet-based image-compression standard geared toward wireless applications. The IC reduces the visual impact of errors that happen in wireless transmission and produces high-quality images regardless of environment, according to Analog Devices.
With JPEG2000, a system can feed different displays of varying resolution from a single encoded video stream. "You have the flexibility of just decoding the information you want and the scalability occurs in quality," said Brooke Crossley, high-speed converter marketing manager for Analog Devices. "If I am getting a really noisy link, I can be sure I am getting some representation of the image." As the channel improves, so can the displayed resolution, she added. And unlike MPEG compression, JPEG2000 encodes each frame independently, so transmission errors that impact one frame cannot degrade the quality of subsequent frames.
JPEG2000 benefits engineers because it works with a fixed bit rate, features low encoding latency, and allows the use of forward-error-correction schemes that cannot be used in temporal-based encoding systems such as MPEG-2, Crossley added.
Pulse~Link's part of the demo includes the company's RF silicon, baseband, and MAC (media access controller). Pulse~Link's OFDM (orthogonal-frequency-division-multiplexing) approach to UWB is superior to the alternatives, providing 1-Gbps of bandwidth, Crossley said. "If we need 30 Mbps for an HD stream, they can offer in the hundreds for throughput, so they have a pheneomenal amont of capacity," Crossley said.