Showing papers on "Enhanced Variable Rate Codec published in 1996"
16 Sep 1996
TL;DR: This work replaces the arithmetic coding portion of the Taubman codec with block coding, and compares the encode/decode speed of this new coder with MPEG, which is one order of magnitude faster than MPEG-1.
Abstract: Scalable video compression is becoming increasingly more important in diverse, heterogeneous networks of today. In a previous work, Taubman and Zakhor (see IEEE Transactions on Image Processing, vol.3, no.5, p.572-88, 1994) developed a scalable codec capable of generating bit rates from tens of kilo bits per second to several mega bits per second with fine granularity of the available bit rates. This codec is based on 3-D subband coding and multi-rate quantization of subband coefficients, followed by arithmetic coding. We replace the arithmetic coding portion of the Taubman codec with block coding, and compare the encode/decode speed of this new coder with MPEG. Unlike MPEG, this codec requires symmetric computational power at the decoder and encoder and as such is useful in software only, real time, interactive video applications. We have found the encoding speed of the new encoder to be one order of magnitude faster than MPEG-1, without significant loss in compression efficiency.
25 citations
05 May 1996
TL;DR: A low-power 16-bit DSP has been developed to realize a low bit-rate speech codec and the PDC half-ratespeech codec is implemented in the DSP with 36 mW at 1.8 V.
Abstract: A low-power 16-bit DSP has been developed to realize a low bit-rate speech codec A dual datapath architecture and low-power circuit design techniques are employed to reduce power consumption The PDC half-rate speech codec is implemented in the DSP with 36 mW at 18 V
9 citations
28 Apr 1996
TL;DR: The technological developments in the GSM from speech coding point of view along with advanced speech transmission techniques which will take GSM to the turn of century and even beyond are described.
Abstract: The new features and technical improvements will take the world leading European developed GSM system in meeting worldwide new customer demands and will compete successfully with other existing and future cellular systems. Among all, the most significant enhancements are the current development of enhanced full-rate (EFR) GSM high quality speech codec. Both PCS1900 standards and ETSI have selected the US1 codec for this purpose despite some drawbacks. This paper describes the technological developments in the GSM from speech coding point of view along with advanced speech transmission techniques which will take GSM to the turn of century and even beyond.
4 citations
Proceedings Article•
01 Sep 1996TL;DR: This paper further extends a multiple layer video codec using affine motion compensation by incorporating a new block level and designing a coding control strategy, which makes the codec perform efficiently at very low bit rate and for small size image sequences.
Abstract: The performance of a very low bit rate video codec largely depends on the efficient use of motion compensated prediction technique and on a good coding control strategy. In our previous approach [6], we proposed a multiple layer video codec using affine motion compensation. In this paper, we further extend our affine compensated multi-layer codec by incorporating a new block level and designing a coding control strategy. A measure of coherent motion is used in the decision process which makes the codec perform efficiently at very low bit rate and for small size image sequences (QCIF and sub-QCIF format). The experimental results conduced on 15 MPEG test sequences in QCIF format show improvement in PSNR of 0.2 dB and reduction in bit rate of 0.9 kbits/second.
1 citations