Efficient encoding method, efficient code decoding method, efficient code encoding apparatus, efficient code decoding apparatus, efficient encoding/decoding system, and recording media
First Claim
1. An efficient encoding method of re-quantizing sample data of respective digital signals of a plurality of channels by a predetermined bit quantity to encode them,the method comprising the steps of:
- specifying a channel in which bit quantity above a fixed reference quantity determined in advance is allocated;
allocating a bit quantity allocated to the channel to a first bit quantity which is not above the fixed reference quantity at most and the remaining second bit quantity;
re-quantizing a portion of the sample data by using bits by the first bit quantity;
re-quantizing at least the other portion of the sample data by using bits by the second bit quantity; and
synthesizing the re-quantized one portion of the sample data and re-quantized the other portion of the sample data.
1 Assignment
0 Petitions
Accused Products
Abstract
Efficient encoding method for carrying out variable bit allocation between channels to samples in the time region or samples in the frequency region of a plurality of channels with respect to information signals of a plurality of channels (CH1˜CH8). This efficient encoding method decomposes bit allocation quantity to channels (CH1, CH3, CH6) in which bit quantity greater than fixed reference quantity (e.g., 147 kbps) is allocated into first bit allocation quantity which is not above 147 kbps and the remaining second bit allocation quantity (bit allocation quantity above 147 kbps) to quantize them. By using this efficient encoding method, it is possible to reproduce, in the state of high sound quality, by making use of inter-channel bit allocation, compressed signals in which sound quality is improved by using inter-channel bit allocation technology with respect to compression of multi-channel system. In addition, also with ordinarily frequently used decoders adapted for carrying out bit allocation within channels by using bit rate less than fixed value individually with respect to respective channels, such compressed signals can be reproduced without great degradation of sound quality.
73 Citations
45 Claims
-
1. An efficient encoding method of re-quantizing sample data of respective digital signals of a plurality of channels by a predetermined bit quantity to encode them,
the method comprising the steps of: -
specifying a channel in which bit quantity above a fixed reference quantity determined in advance is allocated; allocating a bit quantity allocated to the channel to a first bit quantity which is not above the fixed reference quantity at most and the remaining second bit quantity; re-quantizing a portion of the sample data by using bits by the first bit quantity; re-quantizing at least the other portion of the sample data by using bits by the second bit quantity; and synthesizing the re-quantized one portion of the sample data and re-quantized the other portion of the sample data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. An efficiently encoded signal recording method for recording data of a plurality of channels into a single sync block,
the method comprising the steps: -
recording data of a channel in which a bit quantity smaller than a fixed reference quantity determined in advance is allocated; and recording data of a channel in which a bit quantity greater than a fixed reference quantity determined in advance is allocated, the step of recording data further comprising the steps of; allocating a bit quantity allocated to the channel to a first bit quantity which is not above the fixed reference quantity at most and the remaining second quantity; re-quantizing a portion of the sample data by using bits by the first bit quantity to record the re-quantized data; and re-quantizing at least the other portion of the sample data by using bits by the second bit quantity to record the re-quantized data. - View Dependent Claims (20)
-
-
21. A decoding method for an efficiently encoded signal by an encoding method of re-quantizing sample data of respective digital signals of a plurality of channels by a predetermined bit quantity to encode them,
the efficient encoding method comprising the steps of: -
specifying a channel in which a bit quantity greater than a fixed reference quantity determined in advance is allocated; allocating a bit quantity allocated to the channel to a first bit quantity which is not above the fixed reference quantity at most and the remaining second bit quantity; re-quantizing a portion of the sample data by using bits by the first bit quantity; re-quantizing at least the other portion of the sample data by using bits by the second bit quantity; and synthesizing a portion of the re-quantized sample data and the other portion of the re-quantized sample data, the synthesized sample data being recorded or transmitted, sample data at least by the first bit quantity of the recorded or transmitted sample data being caused to be sample data of the corresponding channel to obtain a digital signal of at least one of the plurality of channels. - View Dependent Claims (23, 24)
-
-
22. A decoding method for an efficiently encoded signal by an encoding method of re-quantizing sample data of respective digital signals of a plurality of channels by a predetermined bit quantity to encode them,
the encoding method comprising the steps of: -
specifying a channel in which a bit quantity greater than a fixed reference quantity determined in advance is allocated; allocating a bit quantity allocated to the channel to a first bit quantity which is not above the fixed reference quantity at most and the remaining second bit quantity; re-quantizing a portion of the sample data by using bits by the first bit quantity; re-quantizing at least the other portion of the sample data by using bits by the second bit quantity; synthesizing a portion of the re-quantized sample data and the other portion of the re-quantized sample data, the synthesized sample data being recorded or transmitted, only sample data by the first bit quantity of the recorded or transmitted sample data being caused to be sample data of the corresponding channel to obtain a digital signal of at least one of the plurality channels.
-
-
25. An efficient encoding apparatus adapted for re-quantizing sample data of respective digital signals of a plurality of channels by a predetermined bit quantity to encode them,
the efficient encoding apparatus comprising: -
means for specifying a channel in which a bit quantity greater than a fixed reference quantity determined in advance is allocated; means for allocating a bit quantity allocated to the channel to a first bit quantity which is not above the fixed reference quantity at most and the remaining second bit quantity; means for re-quantizing a portion of the sample data by using bits by the first bit quantity; means for re-quantizing at least the other portion of the sample data by using bits by the second bit quantity; and means for synthesizing a portion of the re-quantized sample data and the other portion of the re-quantized sample data. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
-
-
44. An efficient encoding/decoding system for re-quantizing sample data of respective digital signals of a plurality of channels by a predetermined bit quantity to encode re-quantized data to decode encoded data,
the efficient encoding/decoding system comprising: -
means for specifying a channel in which a bit quantity greater than a fixed reference quantity determined in advance is allocated; means for allocating a bit quantity allocated to the channel to a first bit quantity which is not above the fixed reference quantity at most and the remaining second bit quantity; means for re-quantizing a portion of the sample data by using bits by the first bit quantity; means for re-quantizing at least the other portion of the sample data by using bits by the second bit quantity; means for synthesizing a portion of the re-quantized sample data and the other portion of the re-quantized sample data; means for recording the synthesized sample data onto or into a recording medium or transmitting it to a transmission path; and means for decoding sample data obtained by re-quantizing a portion of sample data by using the sample data by at least the first bit quantity of the recorded or transmitted sample data to obtain a digital of at least one of the plurality of channels.
-
-
45. An efficient encoding/decoding system for re-quantizing sample data of respective digital signals of a plurality of channels by a predetermined bit quantity to encode re-quantized data to decode encoded data,
the efficient encoding/decoding system comprising: -
means for specifying a channel in which a bit quantity greater than a fixed reference quantity determined in advance is allocated; means for allocating a bit quantity allocated to the channel to a first bit quantity which is not above the fixed reference quantity at most and the remaining second bit quantity; means for re-quantizing a portion of the sample data by using bits by the first bit quantity; means for re-quantizing at least the other portion of the sample data by using bits by the second bit quantity; means for synthesizing a portion of the re-quantized sample data and the other portion of the re-quantized sample data; means for recording the synthesized sample data onto or into a recording medium, or transmitting it to a transmission path; and means for decoding, as sample data of the corresponding channel, only sample data by the first bit quantity of the recorded or transmitted sample data to obtain a digital signal of at least one of the plurality of channels.
-
Specification