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# Aeronautical audio broadcasting via satellite

Communications Satellite Corp., Clarksburg, MD.

01/1993; -1:33-38. - Citations (3)
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**ABSTRACT:**This book is written for the design engineer who must build the coding and decoding equipment and for the communication system engineer who must incorporate this equipment into a system. It is also suitable as a senior-level or first-year graduate text for an introductory one-semester course in coding theory. Fundamental concepts of coding are discussed along with group codes, taking into account basic principles, practical constraints, performance computations, coding bounds, generalized parity check codes, polynomial codes, and important classes of group codes. Other topics explored are related to simple nonalgebraic decoding techniques for group codes, soft decision decoding of block codes, algebraic techniques for multiple error correction, the convolutional code structure and Viterbi decoding, syndrome decoding techniques, and sequential decoding techniques. System applications are also considered, giving attention to concatenated codes, coding for the white Gaussian noise channel, interleaver structures for coded systems, and coding for burst noise channels.01/1981; - [show abstract] [hide abstract]

**ABSTRACT:**This paper presents the configuration of the variable-rate Viterbi decoder which was newly developed based on a concept of punctured convolutional coding, and the performance characteristics of punctured codes of rates 1/2 through 16/17 are clarified by hardware experiments and theoretical calculations. Obtained results indicate that the developed codec will be quite useful for effective use of the power and bandwidth of the digital satellite communication systems.01/1983; -1. -
##### Conference Proceeding: Application of line-spectrum pairs to low-bit-rate speech encoders

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**ABSTRACT:**A low-bit-rate speech encoder must employ bit-saving measures to achieve intelligible and natural sounding synthesized speech. Some important measures are: (a) quantization of parameters based on their spectral-error sensitivities (i.e., coarser quantization for spectrally less sensitive parameters), and (b) quantization of parameters in accordance with properties of auditory perception (i.e., coarser quantization of the higher frequency components of the speech spectral envelope, and finer representation of spectral peaks than valleys). The use of Line-Spectrum Pairs (LSPs) makes it possible to employ these measures more readily than the better known reflection coefficients. As a result, the intelligibility of an LSP-based, pitch-excited vocoder operating at 800 bits/second (b/s) can be made as high as 87 for three male speakers (as measured by the Diagnostic Rhyme Test (DRT)) which is only 1.4 below that of the 2400-b/s LPC. Likewise, the intelligibility of a 4800-b/s nonpitch-excited vocoder is as high as 92.3 which compares favorably with scores from current 9600-b/s vocoders.Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '85.; 05/1985

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