Low Delay Sparse and Mixed Excitation CELP Coders for Wideband Speech Coding
Code Excited Linear Prediction (CELP) algorithms are proposed for compression of speech in 8 kHz band at switched or variable bit rate and algorithmic delay not exceeding 2 msec. Two structures of Low-Delay CELP coders are analyzed: Low-delay sparse excitation and mixed excitation CELP. Sparse excit...
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| Formaat: | Artikel |
| Taal: | English |
| Gepubliceerd in: |
Polish Academy of Sciences
2020-02-01
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| Reeks: | International Journal of Electronics and Telecommunications |
| Onderwerpen: | |
| Online toegang: | https://journals.pan.pl/Content/113746/PDF/10_2020.pdf |
| _version_ | 1828427389875519488 |
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| author | Przemysław Dymarski |
| author_facet | Przemysław Dymarski |
| author_sort | Przemysław Dymarski |
| collection | DOAJ |
| description | Code Excited Linear Prediction (CELP) algorithms are proposed for compression of speech in 8 kHz band at switched or variable bit rate and algorithmic delay not exceeding 2 msec. Two structures of Low-Delay CELP coders are analyzed: Low-delay sparse excitation and mixed excitation CELP. Sparse excitation is based on MP-MLQ and multilayer models. Mixed excitation CELP algorithm stems from the narrowband G.728 standard. As opposed to G.728 LD-CELP coder, mixed excitation codebook consists of pseudorandom vectors and sequences obtained with Long-Term Prediction (LTP). Variable rate coding consists in maximizing vector dimension while keeping the required speech quality. Good speech quality (MOS=3.9 according to PESQ algorithm) is obtained at average bit rate 33.5 kbit/sec. |
| first_indexed | 2024-12-10T17:01:05Z |
| format | Article |
| id | doaj.art-00093e4f86914852a7e87d18c75a72b6 |
| institution | Directory Open Access Journal |
| issn | 2081-8491 2300-1933 |
| language | English |
| last_indexed | 2024-12-10T17:01:05Z |
| publishDate | 2020-02-01 |
| publisher | Polish Academy of Sciences |
| record_format | Article |
| series | International Journal of Electronics and Telecommunications |
| spelling | doaj.art-00093e4f86914852a7e87d18c75a72b62022-12-22T01:40:34ZengPolish Academy of SciencesInternational Journal of Electronics and Telecommunications2081-84912300-19332020-02-01vol. 66No 16976https://doi.org/10.24425/ijet.2019.130267Low Delay Sparse and Mixed Excitation CELP Coders for Wideband Speech CodingPrzemysław DymarskiCode Excited Linear Prediction (CELP) algorithms are proposed for compression of speech in 8 kHz band at switched or variable bit rate and algorithmic delay not exceeding 2 msec. Two structures of Low-Delay CELP coders are analyzed: Low-delay sparse excitation and mixed excitation CELP. Sparse excitation is based on MP-MLQ and multilayer models. Mixed excitation CELP algorithm stems from the narrowband G.728 standard. As opposed to G.728 LD-CELP coder, mixed excitation codebook consists of pseudorandom vectors and sequences obtained with Long-Term Prediction (LTP). Variable rate coding consists in maximizing vector dimension while keeping the required speech quality. Good speech quality (MOS=3.9 according to PESQ algorithm) is obtained at average bit rate 33.5 kbit/sec.https://journals.pan.pl/Content/113746/PDF/10_2020.pdfcelplow-delay celpmp-mlqmosvariable bit rate |
| spellingShingle | Przemysław Dymarski Low Delay Sparse and Mixed Excitation CELP Coders for Wideband Speech Coding International Journal of Electronics and Telecommunications celp low-delay celp mp-mlq mos variable bit rate |
| title | Low Delay Sparse and Mixed Excitation CELP Coders for Wideband Speech Coding |
| title_full | Low Delay Sparse and Mixed Excitation CELP Coders for Wideband Speech Coding |
| title_fullStr | Low Delay Sparse and Mixed Excitation CELP Coders for Wideband Speech Coding |
| title_full_unstemmed | Low Delay Sparse and Mixed Excitation CELP Coders for Wideband Speech Coding |
| title_short | Low Delay Sparse and Mixed Excitation CELP Coders for Wideband Speech Coding |
| title_sort | low delay sparse and mixed excitation celp coders for wideband speech coding |
| topic | celp low-delay celp mp-mlq mos variable bit rate |
| url | https://journals.pan.pl/Content/113746/PDF/10_2020.pdf |
| work_keys_str_mv | AT przemysławdymarski lowdelaysparseandmixedexcitationcelpcodersforwidebandspeechcoding |