Tura On the one hand, they want to centralize systems and services to improve efficiencies and reduce costs. The maximum number of products that can be compared is 4. The MV50 is exceptionally quiet, with very low hiss levels and zero hum, thanks to the external DC power adaptor. Dedicated product experts to assist and inform your purchases. Please make sure that you are posting in the form of a question. Image Unavailable Image not available for Color: Preamp driven by Nutube, the revolutionary new vacuum tube.
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Encoding noise is a waste of bandwidth. Removing noise enables improved video delivery at lower bit rates. Noise shares the same space as valuable picture detail, and levels of noise can vary dramatically.
This is especially true with archive material and news feeds. A solution is to deploy multiple preprocessing filters, each with a specific role, and then combine them with an automatic control system to apply the optimal filter at the right strength in the right places.
The final objective of the video preprocessing and compression operation is to maximize the subjective quality of the decoded video signal for a given encoded bit rate. A dedicated MPEG-2 video signal processor is used to extract input signal statistics that are used to assist the decision processes by the compression engine and preprocessing filters.
The MV50 employs a suite of preprocessing filters that perform spatial, temporal and spatio-temporal processing of the input video signal. This form of filtering is much more powerful than temporal-only filtering, in which pixels are filtered with other pixels at the same spatial location. Filtering is then applied using pixels that retain the same position relative to an object moving within the frame sampling structure. MCTF all but eliminates ghosting and trailing normally associated with temporal-only filters.
Random components are heavily suppressed, yet picture details are preserved. It also limits artifacts to within the threshold of visibility. Simple spatial filtering applies intra-frame, two-dimensional low-pass filtering to suppress high-frequency noise.
The downside of this technique is less picture detail. Viewers generally have limited tolerance for reduction in detail and edge definition; therefore, basic spatial filtering should be applied sparingly. Harmonic has developed a new spatial technique that is naturally edge preserving but allows significant filtering to remove noise with Gaussian characteristics. Impulse noise occurs for a single frame and is commonly seen as dots, scratches or film damage. This type of noise does not waste bits like random noise, but it has a significant effect on perceived picture quality and reduces the effectiveness of other noise reduction and compression mechanisms.
The MV50 encoder devotes two thousand million pixel comparisons per second to ascertaining whether a pixel, or group of pixels, are single-frame rogues. Once the impulses have been identified, it is relatively easy to substitute them using values based on spatio-temporal filtering operations. It is well-known that progressive scan video material is more efficiently encoded than interlace video. Interlaced video can be made more efficient by performing an interlace-to-progressive spatio-temporal format conversion.
Unfortunately, this operation introduces motion artifacts when viewed on an interlaced television. The EAT filter has been designed to perform an adaptive de-interlacing function on the input interlaced video signal.
Filtering is performed on regions identified as texture. However, edge-defining objects, or those containing regions of texture, are left in their native interlaced format. Filtering the textured regions in this way can provide the benefits of improved coding efficiency — much like those realized by de-interlacing — without the drawbacks.
When this preprocessing technique is applied to sequences containing high spatial detail and motion, significant improvements in low bit rate encoding efficiency are obtained. The combination of advanced compression technology and powerful and innovative preprocessing techniques is enabling enhanced delivery of digital content at ever-lower bit rates.
Andrew W. Johnson is staff development engineer and Neil Brydon is senior group marketing manager for the Convergent Systems Division of Harmonic Inc.
Harmonic DIVICOM MV50 MPEG-2 Encoder
Encoding noise is a waste of bandwidth. Removing noise enables improved video delivery at lower bit rates. Noise shares the same space as valuable picture detail, and levels of noise can vary dramatically. This is especially true with archive material and news feeds. A solution is to deploy multiple preprocessing filters, each with a specific role, and then combine them with an automatic control system to apply the optimal filter at the right strength in the right places.
Harmonic's MV50 MPEG-2 encoder
Yarmonic maximum number of products that can be compared is 4. These amps have got a few output options with cab sim for practice withheadphones or line out recording as well as the option to run it into a 4,8 or 16 ohm cab. Our engineers took full advantage of this incredible new tube technology to design a true, low power, low voltage miniature amplifier. Your preferred payment type: The DiviCom MV50 encoder provides advanced compression and noise reduction capabilities with dual pass LookAhead encoding for constant bit-rate and statistical multiplexing variable bit-rate applications. Share your thoughts with other customers. Unbeatable Customer Service Based on independent reviews. Please try your search again harmonci.
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