Signals having quantized values and variable length codes
AssigneeSony Corporation
InventorKyoya Tsutsui
Life of this patent
Estimating the term…
Abstract
Efficiently encoded signals wherein the compression ration can be high without a corresponding degradation of signal quality. The range of values of subband-based signal components for quantization to zero, to which a short codelength is given, is set so as to be larger. Consequently the ratio of the subband-based signal components quantized to values of a shorter codelength will become higher than if the subband-based signal components are quantized in such a manner as to minimize the total quantization error energy in each frequency band.
Claims49
An encoded data signal readable by a device and transmitted in a data transmission medium, the encoded data signal comprising:
- quantized values of signal components in a plurality of frequency subbands of a frequency spectrum;
- quantization precision values for the signal components of each subband, wherein the quantization precision is higher where the quantized values are larger and lower where the quantized values are smaller;
- and
- variable-length codes for the quantized values, wherein the code lengths are longer if the quantization precision value is higher, and shorter if the quantization precision value is lower.
An encoded data signal measurable by a device and transmitted in a data transmission medium, the encoded data signal comprising:
- quantized values of signal components in a plurality of frequency subbands of a frequency spectrum;
- quantization precision values for the signal components of each subband, wherein the quantization precision is higher where the quantized values are larger and lower where the quantized values are smaller;
- and
- variable-length codes for the quantized values, wherein the code lengths are longer if the quantization precision value is higher, and shorter if the quantization precision value is lower.
A data signal which has been encoded by a device and transmitted in a data transmission medium, the encoded data signal comprising:
- quantized values of signal components in a plurality of frequency subbands of a frequency spectrum;
- quantization precision values for the signal components of each subband, wherein the quantization precision is higher where the quantized values are larger and lower where the quantized values are smaller;
- and
- variable-length codes for the quantized values, wherein the code lengths are longer if the quantization precision value is higher, and shorter if the quantization precision value is lower.
An encoded data signal transmitted in a data transmission medium and operative to control, in part, the operation of a decoding apparatus, the encoded data signal comprising:
- quantized values of signal components in a plurality of frequency subbands of a frequency spectrum;
- quantization precision values for the signal components of each subband, wherein the quantization precision is higher where the quantized values are larger and lower where the quantized values are smaller;
- and
- variable-length codes for the quantized values, wherein the code lengths are longer if the quantization precision value is higher, and shorter if the quantization precision value is lower.
An encoded data signal readable by a device, the encoded data signal comprising:
- quantized values of signal components in a plurality of frequency subbands of a frequency spectrum;
- quantization precision values for the signal components of each subband, wherein the quantization precision is higher where the quantized values are larger and lower where the quantized values are smaller;
- and
- variable-length codes for the quantized values, wherein the code lengths are longer if the quantization precision value is higher, and shorter if the quantization precision value is lower.
An encoded data signal measurable by a device, the encoded data signal comprising:
- quantized values of signal components in a plurality of frequency subbands of a frequency spectrum;
- quantization precision values for the signal components of each subband, wherein the quantization precision is higher where the quantized values are larger and lower where the quantized values are smaller;
- and
- variable-length codes for the quantized values, wherein the code lengths are longer if the quantization precision value is higher, and shorter if the quantization precision value is lower.
The encoded data signal of claim 37, wherein the frequency subbands are narrower in the low frequency ranges and broader in the high frequency ranges, based upon psychoacoustic characteristics of human hearing.
A data signal which has been encoded by a device, the encoded data signal comprising:
- quantized values of signal components in a plurality of frequency subbands of a frequency spectrum;
- quantization precision values for the signal components of each subband, wherein the quantization precision is higher where the quantized values are larger and lower where the quantized values are smaller;
- and
- variable-length codes for the quantized values, wherein the code lengths are longer if the quantization precision value is higher, and shorter if the quantization precision value is lower.
An encoded data signal operative to control, in part, the operation of a decoding apparatus, the encoded data signal comprising:
- quantized values of signal components in a plurality of frequency subbands of a frequency spectrum;
- quantization precision values for the signal components of each subband, wherein the quantization precision is higher where the quantized values are larger and lower where the quantized values are smaller;
- and
- variable-length codes for the quantized values, wherein the code lengths are longer if the quantization precision value is higher, and shorter if the quantization precision value is lower.
An encoded data signal embodied in a carrier wave and operative to control, in part, the operation of a decoding apparatus, the encoded data signal comprising:
- quantized values of signal components in a plurality of frequency subbands of a frequency spectrum;
- quantization precision values for the signal components of each subband, wherein the quantization precision is higher where the quantized values are larger and lower where the quantized values are smaller;
- and
- variable-length codes for the quantized values, wherein the code lengths are longer if the quantization precision value is higher, and shorter if the quantization precision value is lower.
Dependencies are inferred from the claim text.