Topic
Code-excited linear prediction
About: Code-excited linear prediction is a research topic. Over the lifetime, 2025 publications have been published within this topic receiving 28633 citations. The topic is also known as: CELP.
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2 citations
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2 citations
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30 Sep 1994
TL;DR: In this article, a code drive type sound source encoding device equipped with the sound source signal component generation part consisting of adaptive code book 1 and a probability code book 2 employing a CELP type encoding system, and composed of a power detector 10 which detects feature quantities of a time series of signals such as a speech signal, for example, power ratios, power difference quantities, etc., by frame of an input signal, a comparator 11 which compares the feature quantities with a previously set specific threshold value, and a converter 12 which adaptively converts the contents of a sound source
Abstract: PURPOSE:To provide the speech encoding device which prevents a reproduced speech from deteriorating in quality with a necessary irreducible arithmetic quantity. CONSTITUTION:This device is a code drive type sound source encoding device equipped with the sound source signal component generation part consisting of adaptive code book 1 and a probability code book 2 employing a CELP type encoding system, and composed of a power detector 10 which detects feature quantities of a time series of signals such as a speech signal, for example, power ratios, power difference quantities, etc., by frame of an input signal, a comparator 11 which compares the feature quantities with a previously set specific threshold value, and a converter 12 which adaptively converts the contents of a sound source signal component outputted from a sound source signal component generation part.
2 citations
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01 Mar 2017
TL;DR: Experiments show that CELP 4.8 provides toll quality and reduced delay with PSVQ-Genetic codebook.
Abstract: The development of high quality speech coders at low bit rate and low delay is a challenging task in the field of speech communication, due to ever increasing users in wireless communication networks. CELP codec gives good quality at 4.8 kbps. By optimizing the excitation vectors in the codebook many changes in the performance can be observed to achieve toll quality speech. Codebook optimization can be achieved by improving the training process in the generation process and by using fast searching algorithms. Gaussian (X-means clustering), Fixed (PSVQ) and PSVQ-Genetic codebooks were generated to be included in CELP 4.8. Variations in performance were evaluated using objective and subjective quality measures. Experiments show that CELP 4.8 provides toll quality and reduced delay with PSVQ-Genetic codebook.
2 citations