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MVKBP16VC22RMF60TP_Datasheet PDF

来源:LM317 Electronics Components编辑:Luxo时间:2021-06-15 13:38:58

Figure 1: Typical DTV System Block Diagram

On January 3rd, Freescale announced the first dual-core members of its Onyx family of audio DSPs. The first two chips in the family, the DSP56720 and DSP56721, feature two DSP5636x cores operating at 200 MHz. The chips mainly target high-definition audio processing in next-generation DVD players. To this end, Freescale offers DSP5636x software implementing audio decoders supported by the HD-DVD and Blue-Ray standards, including Dolby Digital+, Dolby TrueHD, and DTS-HD. In addition to DVD players, the chips will target other high-fidelity audio applications such as automotive infotainment equipment, recording consoles, and digital guitar amplifiers.

As shown in Figure 1, each DSP5636x Symphony” DSP core has 92 Kbytes of local RAM and 192 Kbytes of shared RAM. To support the memory bandwidth and I/O requirements of high-def audio, Freescale has added 10 channels of DMA, a S/PDIF transceiver, and an SDRAM interface (previous Symphony DSPs supported only SRAM). Another new feature is a 10-channel asynchronous sample rate converter coprocessor, which supports mixing of audio signals with different sampling rates. This allows, for instance, mixing of CD and DVD audio without running sample rate conversion routines on the DSP cores.

MVKBP16VC22RMF60TP_Datasheet PDF

For further BDTI analysis of the DSP5620 and DSP5621 devices, see the full article at Inside DSP.

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MVKBP16VC22RMF60TP_Datasheet PDF

The Dolby Digital Plus reference software is written in floating-point C code and delivered to the licensee for implementation in a device or a DSP that is then sent to Dolby Laboratories for approval testing. Dolby Laboratories maintains a high standard of quality, so the testing procedure is correspondingly extensive.

To help ensure that the approval process goes smoothly, Dolby Laboratories provides two sets of tests to the implementer for use during development: a set of test vectors to rigorously exercise each part of the algorithm at a low level and quickly compare the output of a decoder under test (DUT) with the output of a reference implementation, and a more rigorous set of tests to verify the final implementation using Audio Precision test equipment. The Audio Precision tests essentially duplicate the testing Dolby Laboratories will perform. Passing both sets of tests in-house is required prior to submission to reduce risk and makes it more likely that the implementation will pass at Dolby Laboratories.

MVKBP16VC22RMF60TP_Datasheet PDF

As noted, MIPS Technologies has developed an optimized version of the code to streamline the process and to provide a high-quality implementation. This code, which has been approved by Dolby Laboratories, is provided to developers who have licensed both the Dolby Digital Plus technology and MIPS processor technology. While a MIPS-Based SoC implementation still must go back to Dolby Laboratories for approval, using the pre-approved code significantly reduces risk for the implementer and helps ensure a quicker turnaround for approval at Dolby Laboratories (Figure 3).

A list of fixed WiMAX system profiles is specified in Table 2. Here, the most globally harmonized band is the licensed 3.5 GHz band (3400 – 3600 MHz).

A list of Release-1 mobile WiMAX profiles is provided in Table 3. These profiles cover a range of channel bandwidths for licensed worldwide spectrum allocations in the 2.3, 2.5, 3.3 and 3.5 GHz frequency bands. Selection of frequency for mobile WiMAX deployment directly affects the quality and cost of the network. Lower frequency bands are generally preferred as they offer lower attenuation and longer reach which, in turn, leads to a smaller number of required cells to provide mobility coverage. The most preferred bands of many would-be mobile WiMAX operators today are between 1.9 GHz and 2.1 GHz. These bands, though, have already been assigned to 3G operators. There is also a growing interest in the 700 – 800 MHz bands traditionally used by analog TV broadcast, but it is unclear when these bands will be completely vacated.

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Fixed WiMAX The 802.16-2004 Fixed WiMAX standard covers both the Media Access Control (MAC) and the physical (PHY) layer protocols for extending broadband wireless access to the metropolitan area network. Fixed WiMAX is based on Orthogonal Frequency Division Multiplexing (OFDM). It can accommodate either time division duplexing (TDD) or frequency division duplexing (FDD) deployments, allowing for both full and half-duplex terminals in the FDD case. In licensed bands, the duplexing method can be either TDD or FDD. Unlicensed operation is limited to using the TDD format. As a cost-effective alternative to cable and DSL services, Fixed WiMAX supports scalable channel bandwidths from 1.25 to 20 MHz. The varying channel bandwidth is necessary to address international markets and regional spectrum regulations. It also supports both fixed and nomadic access in line-of-sight and NLOS environments. At higher frequencies, line of sight is a must as it eases the effect of multi-path and allows for wide channels (e.g. typically greater than 10 MHz in bandwidth). As a result, the standard provides very high capacity links on both the uplink and the downlink. For sub 11 GHz, the NLOS capability is a requirement.

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