| 1. |
- Öwall, Viktor, et al.
(author)
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A GSM speech coder implemented on a customized processor architecture
- 1993
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In: ISCAS '93, 1993 IEEE International Symposium on Circuits and Systems. - 0780312813 ; , s. 235-238
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Conference paper (peer-reviewed)abstract
- - A GSM speech coder has been implemented on a custom DSP using a system for design of arbitrary processor architectures. The speech coder has been generated from a high level description to netlist. The design system allows implementation in various technologies and a netlist for Plessey gate array has been generated. Due to the rigid specification of the speech coder, the advantages of a custom DSP can not be fully utilized and a result in clock cycles and ROM storage comparable to a standard DSP is achieved.
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| 2. |
- Öwall, Viktor, et al.
(author)
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Controller synthesis for application specific digital signal processors
- 1991
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In: [Host publication title missing]. - 0780301013
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Conference paper (peer-reviewed)abstract
- A controller synthesizer, that is part of a design system by which algorithms unsuitable for standard processors can be implemented, is presented. A hierarchical controller architecture suitable for frame-based and multi-sample-rate algorithms is synthesized. Synthesis of a controller is based on micro instructions, specific for each architecture, and assumes no use of predefined functional blocks. The designer can affect complexity and partitioning of the controller by changing the micro program. Processors for speech scrambling and digital adjustment of quadrature modulators have been designed and fabricated.
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| 3. |
- Öwall, Viktor, et al.
(author)
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Controller synthesis for digital signal processors
- 1991
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In: [Host publication title missing]. - 0780300505 ; , s. 2192-2195
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Conference paper (peer-reviewed)abstract
- A tool for synthesis of control units in application-specific digital signal processors is presented. Synthesis of a control unit is based on micro instructions generated for each processor module and includes no use of predefined functional blocks. Complexity and partitioning of the controller are dependent on the structure of the micro program. The control unit synthesizer has been developed for synthesis of controllers to arbitrary digital signal processor architectures. The applications are targeted at digital radio communication algorithms. A hierarchical controller architecture suitable for frame-based and multi-sample-rate algorithms is synthesized by the tool. Processors for speech scrambling and digital adjustment of quadrature modulators have been designed and fabricated.
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| 4. |
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| 5. |
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| 6. |
- Öwall, Viktor
(author)
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Synthesis of Controllers from a Range of Controller Architectures
- 1994
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Doctoral thesis (other academic/artistic)abstract
- An algorithm specific digital signal processor is a powerful alternative to a general purpose signal processor for demanding specifications such as high throughput, low power, small size, etc. These properties are achieved as the processor architecture is tailored to the algorithm as opposed to the general purpose architecture which must suit a wide range of algorithms. The increased performance is traded for reduced flexibility of the final circuit and an increased design effort. Consequently powerful CAD-tools are needed to decrease the design effort. This thesis presents COMA, a CAD-tool for synthesis of controllers suitable for a wide range of digital signal processing algorithms and application fields. COMA synthesizes a complete controller with all modules and interconnection specifications. COMA has been developed with the intention of being used by an active designer where his knowledge, skills, and experience is best utilized. An automated synthesis process can be performed but is preferably refined to a competitive solution using designer interaction before a circuit is fabricated. The main reason for designing an algorithm specific digital signal processors is the possibility to use an architecture dedicated to the algorithm. Consequently, COMA supports arbitrary datapath architectures and does not impose any restrictions. This is crucial in order to fully exploit the advantages of an algorithm specific design. Results presented in this thesis and the discussion regarding controller architectures show that different controller architectures are suitable for different algorithms and different implementation techniques of the fabricated circuit. Thus, COMA can synthesize a range of controller architectures suitable for these different needs. This approach, I believe, is unique for COMA. Standard controller architectures have been modified to suit application specific digital signal processing design and new solutions have been developed. Using COMA complex algorithm specific digital signals processors for a wide range of applications can be designed with a considerable reduction in design effort compared to a hand made design.
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