Journal Article10.1109/TCOM.1982.1095506
Real-Time Speech Coder Implementation on an Array Processor
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TL;DR: This paper considers successful approaches to problems of real-time software design and debugging, system reliability, and implementation correctness in the context of two real- time speech coder algorithms implemented on an array processor, a linear predictive baseband coder, and an adaptive predictive coder operating at 16 kbits/s.
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Abstract: The feasibility of a speech coding algorithm is most effectively indicated by its successful real-time implementation. The implementation effort presents issues distinct from those related to the development of the algorithm. Problems of real-time software design and debugging, system reliability, and implementation correctness must be addressed. In addition, the power of a general purpose array processing computer may be required to accomplish the real-time aspect of the implementation. The unique, often highly parallel, architecture of available array processors can present the additional issues of multiprocessor intercommunication and control. This paper considers successful approaches to these issues in the context of two real-time speech coder algorithms implemented on an array processor, a linear predictive baseband coder operating at 9.6 kbits/s, and an adaptive predictive coder operating at 16 kbits/s.
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Citations
Application of a VLSI Vector Quantization Processor to Real-Time Speech Coding
G. Davidson,Allen Gersho +1 more
TL;DR: A working VQ processor for speech coding based on a first generation VLSI chip that efficiently performs the essential pattern-matching operation needed for the codebook-search process and the CSP architecture has been successfully incorporated into a compact single-board Vector PCM implementation.
31
Current perspectives in digital speech
R. Crochiere,J. Flanagan +1 more
TL;DR: This paper briefly outlines some of the basic properties of speech and the techniques of coding that use these properties and point to areas of current research and areas of practical hardware implementation.
20
Speech processing at BBN
TL;DR: This survey of speech processing activities covers a period that began around 1971, and a number of today's best-regarded techniques in speech and language processing stem from BBN's early work.
8
Design and test of a real-time floating point LPC vocoder
N. Dal Degan,V. Di Lago +1 more
- 01 Apr 1983
TL;DR: Design and implementation of a real-time floating point LPC vocoder running on a general purpose array processor are introduced and the obtained features of the system, execution time and structure flexibility, make the implementation interesting and suggest more general issues too.
A single board multirate APC speech coding terminal
K. Field,A. Derr,L. Cosell,C. Henry,M. Krasner,J. Tiao +5 more
- 01 Apr 1987
TL;DR: A software architecture using this hardware to implement the 16/32 kb/s Adaptive Predictive Coding with Hybrid Quantization (APCHQ) algorithm is described.
References
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Real-time: the “Lost World” of software debugging and testing
TL;DR: Real-time debug and test is still a “lost world” compared to the “civilization” developed in other areas of software, says Robert L. Glass.
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Real-time simulation of adaptive transform coding
R. Cox,R. Crochiere +1 more
TL;DR: It is shown that the choice of the homomorphic "side-information" model leads to a convenient form of the ATC algorithm for real-time block processing using array processing techniques.
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Design of a Robust Baseband LPC Coder for Speech Transmission Over 9.6 Kbit/s Noisy Channels
TL;DR: Informal listening tests of the real-time coder have shown that the coder produces good speech quality in the absence of channel bit errors and introduces only a slight degradation in quality for channel bit error rates of up to 1 percent.
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Microprocessor realization of a linear predictive vocoder
TL;DR: The goal was a low-power, low-cost, compact special-purpose realization of a narrow-band speech terminal, and the resultant design is a general-purpose two-bus structure running at a 150 ns cycle time.
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