Patent
Pyramid vector quantizer shape search
Jonas Svedberg
- 25 Jun 2015
6
TL;DR: In this article, an encoder and a method for pyramid vector quantizer (PVQ) shape search is described. And the encoder determines, based on the maximum pulse amplitude, maxamp y, of a current vector y, whether more than a current bit word length is needed to represent enloop y, in a lossless manner in the upcoming inner dimension loop.
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Abstract: An encoder and a method therein for Pyramid Vector Quantizer, PVQ, shape search, the PVQ taking a target vector x as input and deriving a vector y by iteratively adding unit pulses in an inner dimension search loop. The method comprises, before entering a next inner dimension search loop for unit pulse addition, determining, based on the maximum pulse amplitude, maxamp y , of a current vector y, whether more than a current bit word length is needed to represent enloop y , in a lossless manner in the upcoming inner dimension loop. The variable enloop y is related to an accumulated energy of the vector y. The performing of this method enables the encoder to keep the complexity of the search at a reasonable level. For example, it enables the encoder to apply an increased precision loop only when it may be needed, by analyzing whether the "worst case scenario" in the upcoming inner loop would require an inner loop with a higher precision than the one currently used.
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Citations
Patent
Variable length coding of indices and bit scheduling in a pyramid vector quantizer
Gadiel Seroussi,Martin Alvaro +1 more
- 01 Jun 2017
TL;DR: In this article, a vector element of a signed pyramid is associated with an encoded value that includes a first portion and a second portion, where the first portion identifies a corresponding vector elements of an unsigned pyramid and the second portion characterizes sign values for nonzero components of the vector element.
4
Patent
Cooperative pyramid vector quantizers for scalable audio coding
Shahbazi Mirzahasanloo Taher,Alves Rogerio Guedes +1 more
- 07 Nov 2019
TL;DR: In this article, a memory configured to store the audio data and one or more processors in communication with the memory are configured to obtain, for each of a plurality of subbands of audio data, a respective energy scalar and a respective residual identifier.
1
Patent
Quantizer with index coding and bit scheduling
Gadiel Seroussi,Martin Alvaro +1 more
- 08 Mar 2018
TL;DR: In this paper, a vector element of a signed pyramid is associated with an encoded value that includes a first portion and a second portion, where the first portion identifies a corresponding vector elements of an unsigned pyramid and the second portion characterizes sign values for nonzero components of the vector element.
1
Patent
Inversely enumerated pyramid vector quantizers for efficient rate adaptation in audio coding
Shahbazi Mirzahasanloo Taher,Zuluaga Walter Andres,Alves Rogerio Guedes +2 more
- 31 Oct 2019
TL;DR: In this paper, a memory configured to store the audio data and one or more processors in communication with the memory are configured to decode, from an encoded audio bitstream, a unique identifier for each of a plurality of subbands of audio data; perform inverse pyramid vector quantization (PVQ) using a compact map to reconstruct a residual vector for each subband.
Patent
Audio coding based on audio pattern recognition
Mirzahasanloo Taher Shahbazi,Alves Rogerio Guedes +1 more
- 05 Dec 2019
TL;DR: In this article, techniques are described by which to perform audio coding based on audio pattern recognition, where a source device comprising a memory and a processor may be configured to perform the techniques.
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