Dirac Dimensions, SHARC
The Dirac Dimensions library for the SHARC processor implements an audio post-processing module specified by Dirac Research for the purpose of delivering premium automotive surround sound.
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Overview
Features and Benefits
- Target Processor: Code compatible across the SHARC ADSP-214xx processors
- Framework dependencies: None
- Release format: Object code module with C source wrapper
- Input and Output format: IEEE single-precision floating-point multi-channel PCM streams
- Output and Input buffer samples per block: Variable from 16 up to 1008 samples
- Sample Rate: Arbitrary, nominally 48 kHz
- Delay: Delay depends on the filter coefficient provided by the user. Refer to Dirac for detailed specifications.
- Multi-threading: Fully re-entrant and multi-instancing capable
- Output Status: Number of output samples per channel, number of input samples per channel consumed.
- Error Codes: Reports up to 10 unique error codes.
- Software Quality Standard: A report on the level of MISRA-C compliance for this module is included with the software package.
Product Details
This library for the SHARC processor is an implementation of an audio post-processing module specified by Dirac Research for the purpose of delivering premium automotive surround sound. This module can also be used to implement alternative Dirac algorithms such as Dirac Live®, Dirac Unison™, Dirac Panorama Sound™, and others. Developers should contact Dirac Research for further information.
Dirac Dimensions™ unifies equalization, cross-over, delay, and gain adjustments, with up-mixing from its single- or multi-channel inputs to directly drive multiple speaker outputs. It applies a single customization step to expand the perceived space inside the car, replacing the actual loudspeakers with virtual ones placed in a listening room of your own design. Practicalities, such as up-mixing, setting of relative gains and delays, and acoustical tuning are all integrated in this unifying filter design framework. All available physical loudspeakers contribute, in a way impossible to calculate without advanced multi-dimensional acoustical modelling and mathematical optimization, to create the perfect Stereo or 5.1 experiences for all occupants in the car. Use this Dirac Dimensions DSP software from Analog Devices, Inc. to facilitate integration of Dirac audio processing algorithms in your SHARC-based sound system. In order to apply it to your sound system, you will need a Technology License from Dirac Research, including additional software.
Licensing
Each module supports the Analog Devices, Inc. (ADI) Blackfin or SHARC Processor family and is a licensed product that is available in object code format. Recipients must sign or accept a license agreement with ADI prior to being shipped or downloading the modules identified in the license agreement.
Performance Metrics
| SHARC Processor |
Code RAM (KiB) |
Data RAM (KiB) |
Constant Data Tables (KiB) |
MIPS |
| 21469 |
12.1 |
145.1 |
605.0 |
118 |
| 21479 |
12.1 |
145.1 |
605.0 |
150 |
| 21489 |
12.1 |
145.1 |
605.0 |
167 |
- MIPS is measured using a 6-input 9-output configuration, optimal internal memory code and data layout with coefficient data stored in external memory, on a SHARC ADSP-214xx processor.
- The configuration features: 5.1 multi-channel input, 4 high-band, 4 mid-band and 1 low-band outputs, Fs=48 kHz, 384 samples per block, 2564/1858/900 taps for high-/mid-/low-band filters, 6 input caches.
- Memory usage depends on the actual channel configuration used in a system.
- "Data RAM" for one instance includes stack, scratch, instance/state, input and output single buffers.
- 1 KiB = 1024 Bytes.
- Input buffer size is 9KiB and output buffer size is 13.5KiB for mixing 6 input to 9 output audio channels, using 384 samples per block.
- DMA is used to access filter coefficients stored off-chip.
Systems Requirements
- Windows Vista Business/Enterprise/Ultimate SP2 (32-bit only). It is recommended to install the software in a non-UAC-protected location.
- Windows 7 Professional/Enterprise/Ultimate (32 and 64-bit).
- Minimum of 2 GHz single core processor, 3.3 GHz dual core is recommended.
- Minimum of 1 GB memory (RAM), 4 GB is recommended.
- Minimum of 2 GB hard disk (HDD) space is required.
- CrossCore® Embedded Studio for Analog Devices Processors.