Low Bit Rate Speech Coding via TCVRQ
نویسنده
چکیده
We present a new Trellis Coded Vector Residual Quantizer (TCVRQ) that combines trellis coding and vector residual quantization. We introduce new methods for computing quantization levels and experimentally analyze the performances of our TCVRQ in the case of speech coding at very low bit rates. The results obtained show that transparent quantization of Linear Prediction (LP) parameters can be performed at a rate of 1.9 bits for parameter. Key-Words: Data Compression, Speech Coding, Trellis Vector Residual Quantization
منابع مشابه
A New Trellis Vector Residual Quantizer with Applications to Speech and Image Coding
Quantization is the process of approximating a continuous-amplitude signal by a digital (discrete-amplitude) signal, while minimizing a given distortion measure (or error). Vector Quantizers (or VQ) h ave the property of achieving asintotically the best theoretical performance. Unfortunately, conventional optimal VQ are extremely demanding in terms of both storage and memory requirements, and i...
متن کاملVariable bit rate ADPCM via arithmetic coding
section, leading to the introduction of our proposed variable bit rate system. After some coverage of the performance of the system with a standard linear predictor, we introduce a Kalman predictor, and show an approach to reduce the computational complexity. We discuss the use of perceptual weighting within the system, and bit error resynchronization for the Arithmetic Coding (AC) data stream....
متن کاملAn 800bps VQ Based LPC Voice Coder
The idea of applying vector quantization (VQ) to linear prediction coding (LPC) to realize a very low bit-rate speech coder with reasonable speech quality is investigated in this research. Instead of encoding LPC parameters directly, line spectral frequency (LSF) coefficients are obtained through a transformation of LPC and then encoded via VQ in the proposed scheme. In order to utilize the int...
متن کاملA study on the recognition of low bit-rate encoded speech
Digital speech communications are the future trend in the Internet and mobile phones. The low bit-rate coding of speech signals is the essential requirement in the concern of channel bandwidth and transmission efficiency. The voice-based services will become more attractive to the service providers. Many voice-driven applications require that users must be authorized and able to be identified. ...
متن کاملCoding Face at Very Low Bit Rate via Visual Face Tracking
Facial expressions convey very important information which is sometimes indispensable for people to fully understand the speech during communication. When the volume of video data is overwhelming and channel resources are limited, very low bit rate video coding becomes a solution for teleconferencing. In this paper, we propose an efficient and robust very low bit rate face coding method via vis...
متن کامل