Blackfin

About: Blackfin is a research topic. Over the lifetime, 135 publications have been published within this topic receiving 512 citations.

Attitude Control of a Satellite by Using Digital Signal Processing

Abstract: This article has discussed the development of a three-axis attitude digital controller for an artificial satellite using a digital signal processor. The main motivation of this study is the attitude control system of the satellite Multi-Mission Platform, developed by the Brazilian National Institute for Space Research for application in different sort of missions. The controller design was based on the theory of the Linear Quadratic Gaussian Regulator, synthesized from the linearized model of the motion of the satellite, i.e., the kinematics and dynamics of attitude. The attitude actuators considered in this study are pairs of cold gas jets powered by a pulse width/pulse frequency modulator. In the first stage of the project development, a system controller for continuous time was studied with the aim of testing the adequacy of the adopted control. The next steps had included an analysis of discretization techniques, the setting time of sampling rate, and the testing of the digital version of the Linear Quadratic Gaussian Regulator controller in the MATLAB/SIMULINK. To fulfill the study, the controller was implemented in a digital signal processor, specifically the Blackfin BF537 from Analog Devices, along with the pulse width/pulse frequency modulator. The validation tests used a scheme of co-simulation, where the model of the satellite was simulated in MATLAB/SIMULINK, while the controller and modulator were processed in the digital signal processor with a tool called Processor-In-the-Loop, which acted as a data communication link between both environments.function and required time to achieve a given mission accuracy are determined, and results are provided as illustration.

Rapid heterogeneous prototyping from Simulink

Abstract: Designing embedded high-performance systems is challenging due to complex algorithms, real-time operations and conflicting goals (e.g. power v.s. performance). Heterogeneous platforms that combine processors and custom hardware accelerators are a promising approach. However, manually designing HW/SW systems is prohibitively expensive due to the immense manual effort. This paper introduces SimSH: Simulink Sw/Hw CoDesign Framework, which provides an automatic path from an algorithm captured in Simulink to a heterogeneous implementation. Given an allocation and a mapping decision, the SimSH automatically synthesizes the Simulink model onto the heterogeneous target with reconstruction of the synchronization and communication between processing elements. In the process, the SimSH detects an underutilized bus and optimizes communication by packing/unpacking. Synthesizing a heterogeneous implementation from Simulink allows the developer to focus on the algorithm design with rapid validation and test on a heterogeneous platform. We demonstrate synthesis benefits using a Sobel Edge Detection algorithm and target a heterogeneous architecture of Blackfin processor and Spar-tan3E FPGA. The synthesized solution is 2.68x faster (and energy efficient) over pure SW execution.

Acousto-magnetic synchronous cable fault fixed point detection apparatus based on high-performance DSP

Abstract: The utility model relates to an acousto-magnetic synchronous cable fault fixed point detection apparatus based on a high-performance DSP. The acousto-magnetic synchronous cable fault fixed point detection apparatus is formed by combination of a 533MHz high-performance Blackfin DSP processor and peripheral circuits thereof, and comprises external circuit systems such as an all-directional high-sensitivity ground penetrating microphone sensor and a conditioning circuit thereof, a digital audio amplifier and a hi-fi audio grade timbre output earphone, and a TFT true color liquid crystal screen and the like. An empirical mode decomposition filtering technology is adopted by data detection, and an intelligent background noise reduction function is fulfilled. Real fault points of a cable from a test point can be calculated by two methods, one method is calculating volume of an impulsive discharge noise, and the other method is calculating difference of time when an acoustical signal and a magnetic field signal which are simultaneously transmitted at a fault point discharge time reach the sensor. The acousto-magnetic synchronous cable fault fixed point detection apparatus has extremely high calculating precision and extremely fast calculating speed, high electromagnetic interference resistance capability is high, multiple functions are synthesized, and integrated level is high.

The ADSP-21535 Blackfin and speech coding

Abstract: This paper will evaluate the new processor ADSP-21535 Blackfin from Analog Devices in terms of speech coding. Three speech coding algorithms has been studied, G.723.1, 6.3 kbit/s and 5.3 kbit/s and G.729 8 kbit/s. All these three algorithms are proposed by the H.323 standard together with G.711 64 kbit/s and G.728 16 kbit/s. I will discuss some important issues of these speech coding algoriths and compare them with the capabilities of Blackfin. The work has been done by thoroughly examining the fixed point source code from ITU, International Telecommunication Unions [1], [2] and by the instruction reference manual [3] and the hardware reference guide [4].