Speech Coding
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A Speech Coding is a Data Compression that ...
- See: Voiceband, Data Compression, Digital Audio, Speech, Parameter Estimation, Audio Signal Processing, Mobile Telephony, Voice Over IP, Audio Data Compression, Audio Coding, Psychoacoustics.
References
2017
- (Wikipedia, 2017) ⇒ https://en.wikipedia.org/wiki/speech_coding Retrieved:2017-5-25.
- Speech coding is an application of data compression of digital audio signals containing speech. Speech coding uses speech-specific parameter estimation using audio signal processing techniques to model the speech signal, combined with generic data compression algorithms to represent the resulting modeled parameters in a compact bitstream. [1] The two most important applications of speech coding are mobile telephony and Voice over IP. [2] The techniques employed in speech coding are similar to those used in audio data compression and audio coding where knowledge in psychoacoustics is used to transmit only data that is relevant to the human auditory system. For example, in voiceband speech coding, only information in the frequency band 400 Hz to 3500 Hz is transmitted but the reconstructed signal is still adequate for intelligibility. Speech coding differs from other forms of audio coding in that speech is a simpler signal than most other audio signals, and a lot more statistical information is available about the properties of speech. As a result, some auditory information which is relevant in audio coding can be unnecessary in the speech coding context. In speech coding, the most important criterion is preservation of intelligibility and "pleasantness" of speech, with a constrained amount of transmitted data. [3] In addition, most speech applications require low coding delay, as long as coding delays interfere with speech interaction. [4]
- ↑ M. Arjona Ramírez and M. Minami, "Low bit rate speech coding," in Wiley Encyclopedia of Telecommunications, J. G. Proakis, Ed., New York: Wiley, 2003, vol. 3, pp. 1299-1308.
- ↑ M. Arjona Ramírez and M. Minami, “Technology and standards for low-bit-rate vocoding methods,” in The Handbook of Computer Networks, H. Bidgoli, Ed., New York: Wiley, 2011, vol. 2, pp. 447–467.
- ↑ P. Kroon, "Evaluation of speech coders," in Speech Coding and Synthesis, W. Bastiaan Kleijn and K. K. Paliwal, Ed., Amsterdam: Elsevier Science, 1995, pp. 467-494.
- ↑ J. H. Chen, R. V. Cox, Y.-C. Lin, N. S. Jayant, and M. J. Melchner, A low-delay CELP coder for the CCITT 16 kb/s speech coding standard. IEEE J. Select. Areas Commun. 10(5): 830-849, June 1992.