<p>Another possible solution is a dedicated HD AVC codec ASIC or system on-chip (SOC). The solution typically consists of a combination of hard-wired functions and an embedded processor, which creates an encoding solution that is rigidly defined in terms of how it handles the AVC algorithms. Any changes or improvements to the algorithm require a turn of silicon that is expensive (a 90-nm mask sets costs close to $1M), as well as taking anywhere from six to nine months to implement and deploy. Overall the SOC approach lacks the flexibility and SW programmability required for encoding applications where the compression algorithm continues to evolve in time for improved video quality and lower bit rate.</p>

As in classic L2TP setup, if you do not give a hostname parameter, the device name is used.

where S is the surface area of the conductive surfaces, d is the distance between the plates and ε0 is the permittivity (dielectric constant).

Fairchild's optocouplers are designed using a coplanar construction. This construction configures the LED and photodetector side by side, rather than over/under, as in Figure 2b .

3-1879462-9_Datasheet PDF

The light is coupled from the LED to the photodetector using a transparent insulating-gel material shaped in a spherical dome and surrounded by a reflective epoxy package.

3-1879462-9_Datasheet PDF

In this configuration, the surface area of the two lead frames that contribute to the package capacitance is only the thickness and width of the edge of the lead frame, thereby significantly reducing the value of the surface area (S) in the capacitance equation above. Also, the spacing between the LED and photodetector has less influence on the light-coupling efficiency in the coplanar package compared with the over/under package.

Therefore, when coplanar construction is used, the lead frames can be separated by a greater distance to improve the insulation. This also results in an increase of the distance between the plates (d) in the equation cited, which further improves the package capacitance. Measurements on typical samples confirm the coplanar package construction has a roughly 30 percent lower package capacitance than comparable devices assembled using the over/under package construction.

3-1879462-9_Datasheet PDF

This reduced package capacitance results in better CMH performance. The graph in Figure 3 compares the CMH of a coplanar-packaged optocoupler from Fairchild Semiconductor with an equivalent device built in the over/under package.

Introduction Dolby Digital Plus, the newest generation of Dolby Digital, the standard-setting audio technology from Dolby Laboratories, is making its way into next-generation home entertainment applications, bringing superior sound quality, more efficient audio compression, and an improved user experience to the home.

Dolby Digital Plus, also known as Enhanced AC-3 (E-AC-3), has been developed to address the changing requirements of two burgeoning consumer markets. For the emerging HD DVD and Blu-ray Disc optical disc players, the data compression capabilities of Dolby Digital Plus allow movie studios to combine a superior audio experience with high-definition video. The technology also enhances the latest digital TV set-top boxes (STBs), enabling broadcasters to deploy offerings with lower bit rates, reducing costs and adding flexibility and value for consumers.

While there are tremendous advantages to using Dolby Digital Plus, there are also design considerations that system-on-a-chip (SoC) teams need to understand. The rigorous approval testing that is required at Dolby Laboratories before a chip or a system can use the Dolby Digital Plus logo is substantial. Working with Dolby Laboratories, MIPS Technologies has developed an optimized, tested version of Dolby Digital Plus that will run on any of its 32-bit synthesizable processor cores—significantly slashing audio subsystem development time. This approach also lowers the overall cost of the SoC by eliminating the need for an expensive digital signal processor (DSP).

This white paper outlines the benefits of Dolby Digital Plus for select key consumer audio markets and details the processes behind the collaborative effort between MIPS Technologies and Dolby Laboratories.

Emerging Standards for the Home Entertainment Market HD DVD and Blu-ray Disc Dolby Digital Plus is mandatory in the HD DVD specification and is defined as optional in Blu-ray Disc. The specifications also allow for multiple independent streams so a movie can be shipped with multiple independent soundtracks or support multiple languages.


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