WO2016140071A1 - 圧縮符号化装置、圧縮符号化方法、復号装置、復号方法、およびプログラム - Google Patents
圧縮符号化装置、圧縮符号化方法、復号装置、復号方法、およびプログラム Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- H03M7/60—General implementation details not specific to a particular type of compression
- H03M7/6011—Encoder aspects
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/0017—Lossless audio signal coding; Perfect reconstruction of coded audio signal by transmission of coding error
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- H03M3/00—Conversion of analogue values to or from differential modulation
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- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
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- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- H03M7/40—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- H03M7/40—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
- H03M7/42—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code using table look-up for the coding or decoding process, e.g. using read-only memory
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- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
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Definitions
- the present disclosure relates to a compression encoding device, a compression encoding method, a decoding device, a decoding method, and a program, and in particular, a compression encoding device and a compression code that can provide a lossless compression technique with a higher compression rate.
- the present invention relates to an encryption method, a decoding device, a decoding method, and a program.
- Lossless compression technology such as FLAC (Free Lossless Audio Codec) is used for the sound source of 96 kHz / 24 bit PCM (Pulse Code Modulation) and is used for distribution.
- DSD Direct Stream Digital
- SACD Super Audio CD
- this technology is based on 1-bit signal processing and is not suitable for software processing on a CPU based on byte-by-byte processing, so it is implemented in hardware (LSI) in SACD players and the like. . If you try to process with software, the processing amount is heavy, so it cannot be processed by a general embedded CPU.
- LSI hardware
- the present applicant has proposed a technique of referring to past data in units of 4 bits and compressing current data to 2 bits as a lossless compression technique of audio signals using DSD data in Patent Document 1.
- Patent Document 1 requires a lossless compression technique with a higher compression ratio because the data compression ratio is not so large.
- the present disclosure has been made in view of such a situation, and is intended to provide a lossless compression technique with a higher compression rate.
- the compression encoding apparatus converts M bits of a ⁇ -modulated digital signal into N bits (M> N) with reference to the first conversion table, and the first conversion table.
- an encoding unit that converts the N bits into the N bits with reference to a second conversion table, and when the number of bit patterns of the N bits is P, the first conversion table
- the second conversion table stores the highest (P-1) codes with the occurrence frequency for the past bit pattern next to the first conversion table (P-1). ) Is a table storing codes.
- the compression encoding method converts M bits of a ⁇ -modulated digital signal into N bits (M> N) with reference to the first conversion table, and the first conversion table.
- N bits M> N
- conversion to the N bits is performed with reference to a second conversion table, and when the number of bit patterns of the N bits is P, the first conversion table corresponds to a past bit pattern.
- a program causes a computer to convert M bits of a ⁇ -modulated digital signal into N bits (M> N) with reference to a first conversion table, and In the case where the conversion to the N bits is not possible, the process of converting to the N bits is executed with reference to the second conversion table, and when the number of bit patterns of the N bits is P, the first conversion table
- the second conversion table stores the highest (P-1) codes with the occurrence frequency for the past bit pattern next to the first conversion table (P-1). ) Is a table storing a number of codes.
- the first conversion table is a table in which codes having the highest occurrence frequency (P-1) with respect to past bit patterns are stored.
- the conversion table is a table that stores the upper (P-1) codes with the occurrence frequency for the past bit pattern next to the first conversion table.
- the decoding device provides the first conversion table with the N bits of the encoded data obtained by compressing and encoding the M bits of the ⁇ -modulated digital signal into N bits (M> N).
- a decoding unit that refers to a second conversion table and decodes it to the M bits when it is converted to the M bits by reference and cannot be converted to the M bits by the first conversion table;
- the first conversion table is a table in which codes with the highest occurrence frequency (P-1) for the past bit pattern are stored, and the second conversion table is for the past bit pattern. This is a table storing the upper (P-1) codes with the frequency of occurrence following the first conversion table.
- the N bits of the encoded data obtained by compressing and encoding the M bits of the ⁇ -modulated digital signal into N bits are stored in the first conversion table. If it is converted to M bits by reference and cannot be converted to M bits by the first conversion table, it is decoded to M bits by referring to a second conversion table, and the number of bit patterns of N bits is set to P
- the first conversion table is a table in which codes having the highest occurrence frequency (P-1) with respect to the past bit pattern are stored, and the second conversion table has the occurrence frequency with respect to the past bit pattern. It is a table that stores the upper (P-1) codes next to the first conversion table.
- a program according to a second aspect of the present disclosure is a program that performs first conversion on the N bits of encoded data obtained by compressing and encoding M bits of a ⁇ -modulated digital signal into N bits (M> N).
- M ⁇ -modulated digital signal
- the first conversion table is a table that stores codes with the highest occurrence frequency (P-1) with respect to past bit patterns
- the second conversion table contains past bits. This is a table in which the uppermost (P-1) codes with the occurrence frequency for the pattern are stored next to the first conversion table.
- the N bits of the encoded data obtained by compressing and encoding the M bits of the ⁇ -modulated digital signal into N bits refer to the first conversion table.
- the first conversion table cannot be converted to the M bit
- the second conversion table is referenced to decode the M bit.
- the first conversion table is a table in which codes having the highest occurrence frequency (P-1) with respect to past bit patterns are stored.
- the conversion table is a table that stores the upper (P-1) codes with the occurrence frequency for the past bit pattern next to the first conversion table.
- program can be provided by being transmitted through a transmission medium or by being recorded on a recording medium.
- the compression encoding device and the decoding device may be independent devices, or may be internal blocks constituting one device.
- First embodiment basic configuration example
- Second embodiment configuration example for compressing and transmitting conversion table data
- Third embodiment configuration example selected from a plurality of conversion tables
- Fourth embodiment configuration example using a two-stage conversion table
- Fifth embodiment configuration example for compressing and transmitting a two-stage conversion table
- Sixth embodiment configuration example selected from a plurality of two-stage conversion tables
- Seventh embodiment first configuration example for selecting a plurality of past data reference bit numbers
- 8 seventh embodiment (second configuration example for selecting a plurality of past data reference bit numbers) 9.
- Ninth embodiment (configuration example for compressing and transmitting a Q-stage conversion table) 10.
- Tenth embodiment (first configuration example having a 4to2 encoding unit and a 4to1 encoding unit) 11.
- Eleventh embodiment (second configuration example having a 4to2 encoding unit and a 4to1 encoding unit)
- FIG. 1 illustrates a configuration example of a first embodiment of a compression encoding device according to the present disclosure.
- 1 is an apparatus that converts an analog audio signal into a digital signal by ⁇ (sigma delta) modulation, compression-encodes the converted audio signal, and outputs the digital signal.
- Analog audio signals are input from the input unit 11 and supplied to the ADC 12.
- the ADC 12 digitizes the supplied analog audio signal by ⁇ modulation and outputs it to the input buffer 13.
- the ADC 12 includes an adder 21, an integrator 22, a comparator 23, a one-sample delay circuit 24, and a 1-bit DAC 25.
- the audio signal supplied from the input unit 11 is supplied to the adder 21.
- the adder 21 adds the analog audio signal one sample period before supplied from the 1-bit DAC 25 and the audio signal from the input unit 11, and outputs the result to the integrator 22.
- the integrator 22 integrates the audio signal from the adder 21 and outputs it to the comparator 23.
- the comparator 23 is compared with the midpoint potential of the input audio signal and performs 1-bit quantization for each sample period.
- the frequency of the sampling period (sampling frequency) is 64 times or 128 times that of the conventional 48 kHz or 44.1 kHz.
- the comparator 23 outputs the 1-bit quantized audio signal to the input buffer 13 and supplies it to the 1-sample delay circuit 24.
- the 1-sample delay circuit 24 delays the audio signal from the comparator 23 by 1 sample period and outputs it to the 1-bit DAC 25.
- the 1-bit DAC 25 converts the digital signal from the 1-sample delay circuit 24 into an analog signal and outputs it to the adder 21.
- the ADC 12 configured as described above converts the audio signal supplied from the input unit 11 into a 1-bit digital signal (AD conversion) and outputs it to the input buffer 13. According to this ⁇ modulation AD conversion, a digital audio signal with a wide dynamic range can be obtained even with a small number of bits, for example, by increasing the frequency of the sampling period (sampling frequency) sufficiently.
- a stereo (2-channel) audio signal is input to the ADC 12 from the input unit 11, and the ADC 12 AD-converts it to a 1-bit signal at a sampling frequency 128 times 44.1 kHz. Output to the input buffer 13.
- the number of quantization bits can be 2 bits or 4 bits.
- the input buffer 13 temporarily stores the 1-bit digital audio signal supplied from the ADC 12 and supplies the audio signal to the control unit 14, the encoding unit 15, and the data amount comparison unit 17 in the subsequent stage in units of one frame.
- one frame is a unit that divides an audio signal into a predetermined time (period) and is regarded as one unit.
- one frame is one frame. Therefore, in other words, the input buffer 13 supplies the audio signal to the control unit 14, the encoding unit 15, and the data amount comparison unit 17 in units of 3 seconds.
- the audio signal input from the input unit 11 is a stereo (two-channel) signal, and is AD-converted to a 1-bit signal at a sampling frequency 128 times 44.1 kHz, so that the audio signal per frame
- the ⁇ -modulated digital signal supplied from the input buffer 13 is also referred to as DSD data.
- the control unit 14 controls the overall operation of the compression encoding apparatus 1.
- the control unit 14 has a function of creating a conversion table table1 necessary for the encoding unit 15 to perform compression encoding and supplying the conversion table table1 to the encoding unit 15.
- control unit 14 creates a data generation count table pretable using one frame of DSD data supplied from the input buffer 13, and further creates a conversion table table1 from the data generation count table pretable.
- the control unit 14 supplies the created conversion table table1 to the encoding unit 15 and the data transmission unit 18.
- the conversion table table1 is created (updated) in units of one frame and supplied to the encoding unit 15.
- the encoding unit 15 uses the conversion table table1 supplied from the control unit 14 to compress and encode the DSD data supplied from the input buffer 13 in units of 4 bits. Accordingly, the DSD data is supplied from the input buffer 13 to the control unit 14 at the same time as the encoding unit 15 is supplied to the control unit 14, but the encoding unit 15 waits until the conversion table is supplied from the control unit 14.
- the encoding unit 15 encodes 4-bit DSD data into 2-bit data or 6-bit data, The data is output to the encoded data buffer 16.
- the encoded data buffer 16 temporarily buffers compressed data that is DSD data compression-encoded by the encoding unit 15 and supplies the compressed data to the data amount comparison unit 17 and the data transmission unit 18.
- the data amount comparison unit 17 compares the data amount of the DSD data (hereinafter also referred to as uncompressed data) supplied from the input buffer 13 and the compressed data supplied from the encoded data buffer 16 in units of frames. Since the encoding unit 15 encodes 4-bit DSD data into 2-bit data or 6-bit data as described above, the amount of data after compression is the amount of data before compression on the algorithm. It is because it may exceed. Therefore, the data amount comparison unit 17 compares the data amounts of the compressed data and the non-compressed data, selects the one with the smaller data amount, and supplies the data transmission unit 18 with selection control data indicating which one has been selected. .
- the data amount comparison unit 17 also supplies uncompressed data to the data transmission unit 18 when supplying selection control data indicating that uncompressed data has been selected to the data transmission unit 18.
- the selection control data can be said to be a flag indicating whether or not the audio data transmitted from the data transmission unit 18 is data that has been compression-encoded by the encoding unit 15 when viewed from the receiving-side device that receives the transmission data. .
- the data transmission unit 18 selects either compressed data supplied from the encoded data buffer 16 or uncompressed data supplied from the data amount comparison unit 17. Either one is selected, and the selected control data is transmitted to the partner apparatus via the output unit 19 together with the selection control data.
- the data transmission unit 18 when transmitting the compressed data, the data transmission unit 18 also adds the data of the conversion table table1 supplied from the control unit 14 to the compressed data and transmits the compressed data.
- the data transmission unit 18 can transmit the transmission data by adding a synchronization signal and an error correction code (ECC) to a digital signal for each predetermined number of samples.
- ECC error correction code
- the control unit 14 creates a data generation count table pretable for one frame of DSD data, and represents the DSD data supplied from the input buffer 13 in units of 4 bits as follows. ... D4 [n-3], D4 [n-2], D4 [n-1], D4 [n], D4 [n + 1], D4 [n + 2], D4 [n + 3], ...
- D4 [n] represents 4-bit continuous data, and is hereinafter also referred to as D4 data (n> 3).
- the control unit 14 counts the number of occurrences of D4 data next to the past three D4 data (past 12-bit data), and creates a data generation count table pretable [4096] [16] shown in FIG.
- [4096] and [16] of the data generation count table pretable [4096] [16] indicate that the data generation count table is a table (matrix) having 4096 rows and 16 columns, and [0] to [4095].
- the number of times “0” was 369a (HEX notation), indicating that there was no other data.
- the number of times was 10 times, the number of times “3” was 18 times, the number of times “4” was 20 times, the number of times “5” was 31 times, and “6” 11 times, “7” was 0 times, “8” was 4 times, “9” was 12 times, “ This indicates that the number of times “10” was 5 and the number of times “11” to “15” was 0.
- control unit 14 counts the number of occurrences of D4 data next to the past three D4 data (past 12-bit data) for one frame of DSD data, and generates a data generation count table pretable.
- the control unit 14 creates a conversion table table1 [4096] [3] of 4096 rows and 3 columns based on the previously generated data generation count table pretable.
- each row [0] to [4095] of the conversion table table1 [4096] [3] corresponds to a value that can be taken by the past three D4 data
- each column [0] to [2] includes the following: Of the 16 values that can be taken by the D4 data, three values having a high occurrence frequency are stored.
- the first column [0] of the conversion table table1 [4096] [3] stores the value with the highest occurrence frequency (first), and the second column [1] has the second occurrence frequency value. Is stored, and the third column [2] stores the value of the third occurrence frequency.
- FIG. 3 shows an example of the conversion table table1 [4096] [3] corresponding to the data generation count table pretable shown in FIG.
- the table1 [117] [0] to [117] [2], which are the 118th line of the conversion table table1 [4096] [3], are ⁇ 05, 04, 03 ⁇ . This corresponds to the contents of pretable [117] [0] to [117] [15] on line 118 of the data generation count table pretable in FIG.
- the most frequently occurring (first) value is “5” generated 31 times.
- the second value of occurrence frequency is “4” generated 20 times
- the third value of occurrence frequency is “3” generated 18 times.
- ⁇ 05 ⁇ is stored in the 118th row, first column table1 [117] [0] of the conversion table table1 [4096] [3], and the 118th row, second column table1 [117] [1].
- ⁇ 04 ⁇ is stored, and ⁇ 03 ⁇ is stored in the 118th row, third column table1 [117] [2].
- table1 [0] [0] to [0] [2] on the first row of the conversion table table1 [4096] [3] are pretable [0] on the first row of the data generation count table pretable of FIG. This corresponds to the contents of [0] to [0] [15].
- pretable [0] [0] to [0] [15] in the first row of the data generation count table pretable in FIG. 2 the most frequently occurring (first) value occurs 369a (HEX notation) times. “0” and no other value is generated. Therefore, ⁇ 00 ⁇ is stored in the first row and first column table1 [0] [0] of the conversion table table1 [4096] [3], and the first row and second column table1 [0] [1] and the first row are stored. In the first row and third column table1 [0] [2], ⁇ ff ⁇ indicating that no data exists is stored. The value indicating that data does not exist is not limited to ⁇ ff ⁇ and can be determined as appropriate. Since the value stored in each element of the conversion table table1 is one of “0” to “15”, it can be expressed in 4 bits, but it is expressed in 8 bits for ease of handling in terms of computer processing. Has been.
- the conversion table table1 [4096] [3] of 4096 rows and 3 columns is created based on the previously generated data generation count table pretable and supplied to the encoding unit 15.
- the case where the encoding unit 15 encodes D4 [n] will be described.
- the encoding unit 15 converts the previous 12-bit data D4 [n-3], D4 [n-2], and D4 [n-1] immediately before 12 into a group of 12 bits. Assuming bit data, three values of the address (row) indicated by D4 [n-3], D4 [n-2], D4 [n-1] in the conversion table table1 [4096] [3] table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [0], table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [2] Search for.
- the encoding unit 15 includes three values of addresses (rows) indicated by D4 [n-3], D4 [n-2], and D4 [n-1] in the conversion table table1 [4096] [3].
- table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [0] table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [2]
- the encoding unit 15 has three values of addresses (rows) indicated by D4 [n-3], D4 [n-2], and D4 [n-1] in the conversion table table1 [4096] [3]. If there is no same thing in As in “00b + D4 [n]”, “00b” is added before D4 [n] to convert it to 6 bits.
- b in “01b”, “10b”, “11b”, and “00b + D4 [n]” represents binary notation.
- the encoding unit 15 converts the 4-bit DSD data D4 [n] into 2-bit data “01b”, “10b”, or “11b” using the conversion table table1, or , Converted into 6-bit data “00b + D4 [n]” and output to the encoded data buffer 16.
- FIG. 4 is a diagram illustrating a configuration example of the encoding unit 15 that performs the above-described compression encoding.
- the 4-bit DSD data (for example, D4 [n]) supplied from the input buffer 13 is stored in the register 51 that stores 4 bits.
- the output of the register 51 is connected to one input terminal 56a of the selector 55 and a register 52 for storing 12 bits.
- the register 52 stores the data immediately before the 4-bit DSD data stored in the register 51.
- the past 12-bit data (for example, D4 [n-3], D4 [n-2], D4 [n-1]) is stored.
- the conversion table processing unit 53 has a conversion table table1 supplied from the control unit 14.
- the conversion table processing unit 53 includes three values of addresses indicated by 12-bit data (for example, D4 [n-3], D4 [n-2], D4 [n-1]) stored in the register 52, table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [0], table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [2] Are searched for whether there is 4-bit data (for example, D4 [n]) stored in the register 51, and if there is, the value corresponding to the column in which the same value is stored, That is, “01b”, “10b”, or “11b” is stored in the 2-bit register 54.
- the data stored in the 2-bit register 54 is supplied to one input terminal 56 c of the selector 55.
- the conversion table processing unit 53 uses three bits of addresses indicated by 12-bit data (for example, D4 [n-3], D4 [n-2], D4 [n-1]) stored in the register 52. If there is no 4-bit data (for example, D4 [n]) stored in the register 51 in the value, a signal indicating that no conversion is performed (hereinafter referred to as no conversion signal) is selected by the selector 55. Output to.
- the selector 55 selects one of the three input terminals 56 a to 56 c and outputs data acquired from the selected input terminal 56 from the output terminal 57.
- the selector 55 selects the input terminal 56b, outputs “00b” from the output terminal 57, and then selects the input terminal 56a. Then, 4-bit DSD data (for example, D4 [n]) stored in the register 51 is output from the output terminal 57. As a result, 6 bits “00b + D4 [n]” output when the conversion table table1 does not have the same D4 [n] are output from the output terminal 57.
- the selector 55 selects the input terminal 56c and is supplied from the register 54.
- 2-bit conversion data is output from the output terminal 57.
- two bits that are output when there is the same D4 [n] in the conversion table table1, that is, “01b”, “10b”, or “11b” are output from the output terminal 57. .
- step S1 the control unit 14 counts the number of occurrences of D4 data next to the past three D4 data (past 12-bit data) for one frame of DSD data, and generates a data generation count table. Create a pretable.
- step S2 the control unit 14 creates a conversion table table1 having 4096 rows and 3 columns based on the created data occurrence count table pretable.
- the control unit 14 supplies the created conversion table table1 to the encoding unit 15 and the data transmission unit 18.
- step S3 the encoding unit 15 performs compression encoding on the DSD data for one frame period using the conversion table table1. Specifically, the encoding unit 15 converts the 4-bit DSD data D4 [n] into 2-bit data “01b”, “10b”, or “11b”, or 6-bit data “00b +” The process of converting to D4 [n] ”is performed on the DSD data for one frame period. The compressed data obtained by the compression encoding is supplied to the encoded data buffer 16 and the data amount comparison unit 17.
- step S ⁇ b> 4 the data amount comparison unit 17 compares the data amount of one frame of uncompressed data supplied from the input buffer 13 with the data amount of one frame of compressed data supplied from the encoded data buffer 16. It is determined whether or not it has been reduced than before compression.
- step S4 If it is determined in step S4 that the data amount has been reduced from before compression, the process proceeds to step S5, and the data amount comparison unit 17 sends selection control data indicating that the compressed data has been selected to the data transmission unit 18. Supply.
- step S ⁇ b> 6 the data transmission unit 18 supplies the selection control data (a flag indicating compression-encoded data) indicating that the compressed data has been selected and the compressed data supplied from the encoding unit 15 from the control unit 14.
- the data of the converted conversion table table1 (conversion table data) is added and transmitted to the partner apparatus.
- step S4 determines whether the data amount has been reduced than before compression. If it is determined in step S4 that the data amount has not been reduced than before compression, the process proceeds to step S7, and the data amount comparison unit 17 selects selection control data indicating that uncompressed data has been selected. The data is supplied to the data transmitter 18 together with the uncompressed data.
- step S8 the data transmitting unit 18 transmits selection control data (a flag indicating uncompressed data) indicating that uncompressed data has been selected and uncompressed data to the counterpart device.
- selection control data a flag indicating uncompressed data
- steps S1 to S8 described above are repeatedly performed on DSD data in units of one frame that are sequentially supplied from the input buffer 13.
- FIG. 6 illustrates a configuration example of the first embodiment of the decoding device according to the present disclosure.
- 6 is an apparatus that receives and decompresses (losslessly decodes) an audio signal that has been compression-encoded and transmitted by the compression-encoding apparatus 1 of FIG.
- the audio signal transmitted after compression encoding by the compression encoding apparatus 1 in FIG. 1 is transmitted through a network (not shown) (for example, LAN (Local Area Network), WAN (Wide Area Network), Internet, telephone line network, satellite communication network, etc.
- the data is received by the input unit 71 of the decoding device 70 via the public line network and the like and supplied to the data receiving unit 72.
- the data receiving unit 72 separates the synchronization signal included in the received data, and detects and corrects transmission errors that occur during network transmission.
- the data reception unit 72 determines whether or not the audio signal is compression-encoded based on selection control data included in the reception data and indicating whether or not the audio signal is compression-encoded.
- the data receiving unit 72 supplies the received compressed data to the encoded data buffer 73.
- the data receiving unit 72 supplies the received uncompressed data to the output buffer 76.
- the data receiving unit 72 supplies the data (conversion table data) of the conversion table table1 included in the received data to the table storage unit 75.
- the table storage unit 75 stores the conversion table table1 supplied from the data receiving unit 72 and supplies it to the decoding unit 74 as necessary.
- the encoded data buffer 73 temporarily stores the compressed data supplied from the data receiving unit 72 and supplies the compressed data to the subsequent decoding unit 74 at a predetermined timing.
- the decoding unit 74 decodes the compressed data to a state before compression (reversible decoding) and supplies it to the output buffer 76.
- a decoding method by the decoding unit 74 will be described.
- E2 [n] represents 2-bit continuous data and is also referred to as E2 data.
- the decoding unit 74 first determines the value of E2 [n].
- E2 [n] is “00b”
- the data is not mounted in the received conversion table table1 [4096] [3], so the next 4-bit data “E2 [n +] after E2 [n] 1] + E2 [n + 2] ”is the data to be decoded.
- E2 [n] is “01b”, “10b”, or “11b”, it is the data mounted in the received conversion table table1 [4096] [3], so it was decoded immediately before Using the 12-bit D4 data D4 [n-3], D4 [n-2], and D4 [n-1], the conversion table table1 [4096] [3] is referenced to search for data to be decoded.
- the data to be decoded is the data stored in “table1 [D4 [n-3], D4 [n-2], D4 [n ⁇ 1]] [E2 [n] ⁇ 1]”.
- the decoding unit 74 can decode (reversible decoding) the compressed data to the state before compression.
- the decoding unit 74 includes a 2-bit register 91, a 12-bit register 92, a conversion table processing unit 93, a 4-bit register 94, and a selector 95, as shown in FIG.
- the 2-bit E2 data (for example, E2 [n]) supplied from the encoded data buffer 73 is stored in the register 91.
- the 12-bit register 92 is supplied with the output of the selector 95, and the register 92 decodes immediately before the 2-bit E2 data (for example, E2 [n]) stored in the register 91. 12-bit data (for example, D4 [n-3], D4 [n-2], D4 [n-1]) is stored.
- the conversion table processing unit 93 When the 2-bit E2 data (for example, E2 [n]) stored in the register 91 is “01b”, “10b”, or “11b”, the conversion table processing unit 93 is supplied from the table storage unit 75. Register the 4-bit data stored in “table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [E2 [n] -1]” of the converted conversion table table1 94. The selector 95 selects the input terminal 96b, and outputs the data stored in the register 94 from the output terminal 97 as a decoding result.
- the output buffer 76 appropriately selects either the uncompressed data supplied from the data receiving unit 72 or the decoded data supplied from the decoding unit 74, and supplies the selected data to the analog filter 77.
- the analog filter 77 performs predetermined filter processing such as a low-pass filter and a band-pass filter on the decoded data supplied from the output buffer 76, and outputs the result from the output unit 78.
- predetermined filter processing such as a low-pass filter and a band-pass filter
- step S21 the data receiving unit 72 determines whether the received data is compression-encoded compressed data based on selection control data included in the received data.
- step S21 If it is determined in step S21 that the received data is compressed data, the process proceeds to step S22, and the data receiving unit 72 supplies the conversion table data included in the received data to the table storage unit 75.
- the conversion table processing unit 93 acquires the received conversion table table1 via the table storage unit 75.
- step S 22 the compressed data included in the received data is supplied to the encoded data buffer 73.
- step S23 the decoding unit 74 decodes the compressed data supplied from the encoded data buffer 73 using the conversion table table1, and supplies the decoded data to the output buffer 76. That is, when the 2-bit E2 data (for example, E2 [n]) is “00b”, the decoding unit 74 performs the next 4-bit data “E2 [n + 1] + E2 [n] after E2 [n].
- step S21 if it is determined in step S21 that the received data is not compressed data, that is, uncompressed data, the process proceeds to step S24, and the data receiving unit 72 includes the uncompressed data included in the received data. Is supplied to the output buffer 76.
- uncompressed data or data decoded by the decoding unit 74 is supplied to the output buffer 76, and the data supplied to the output buffer 76 is output to the analog filter 77.
- step S25 the analog filter 77 performs a predetermined filter process on the data supplied via the output buffer 76.
- the filtered audio signal is output from the output unit 78.
- the above processing is repeatedly executed for the audio signal in units of one frame.
- the compression encoding device 1 compresses and transmits DSD data
- the decoding device 70 receives the transmission data transmitted after being compressed and encoded. Decrypt and output.
- the data itself of the conversion table table1 used for compression encoding is also transmitted as transmission data.
- FIG. 8 illustrates a configuration example of the second embodiment of the compression encoding device according to the present disclosure.
- the compression coding apparatus 1 according to the second embodiment has one control unit 14.
- the conversion table compression unit 101 is newly provided in the unit.
- the conversion table table1 [4096] [3] of 4096 rows and 3 columns created by the control unit 14 is transmitted together with the compressed data without being compressed as the conversion table data. .
- the data amount of the conversion table table1 may be larger than the data amount of the compressed data.
- the conversion table compression unit 101 can be provided as in the second embodiment.
- the conversion table compression unit 101 creates compressed conversion table data obtained by compressing the data of the conversion table table1 by compressing the data of the conversion table table1 by a predetermined compression method or creating difference data of the conversion table table1. To the data transmission unit 18.
- the data transmission unit 18 transmits the compression conversion table data to the partner apparatus together with the compression data and the like instead of the conversion table data in the first embodiment.
- FIG. 9 illustrates a configuration example of the second embodiment of the decoding device according to the present disclosure.
- the decoding device 70 in FIG. 9 is a device that receives and decompresses (losslessly decodes) an audio signal that has been compressed and transmitted by the compression encoding device 1 in FIG.
- the decoding device 70 of the second embodiment includes a data receiving unit 72 and a table storage unit 75. In the middle, a conversion table decompression unit 111 is newly provided.
- the conversion table decompression unit 111 performs decompression processing corresponding to the compression processing performed by the conversion table compression unit 101 in FIG. 8 on the compression conversion table data supplied from the data reception unit 72.
- the conversion table table1 obtained as a result of the decompression process is supplied to the table storage unit 75 as in the first embodiment.
- the compression encoding device 1 compresses and transmits DSD data
- the decoding device 70 receives the transmission data that has been compressed and transmitted, and is reversible. Decrypt and output.
- the data of the conversion table table1 used for compression encoding is compressed and transmitted as transmission data.
- FIG. 10 illustrates a configuration example of the third embodiment of the compression encoding device according to the present disclosure.
- the control unit 14 When comparing the compression coding apparatus 1 of FIG. 10 with the compression coding apparatus 1 of the first embodiment shown in FIG. 1, in the compression coding apparatus 1 of the third embodiment, the control unit 14 A plurality of conversion tables table1 are provided.
- the control unit 14 stores three types of conversion tables table1 including a conversion table table1-1, a conversion table table1-2, and a conversion table table1-3. Is not limited.
- the conversion table table1 which is created based on the data generation count table pretable, has little difference depending on the content. This is presumably because even if the order of occurrence frequency is slightly different, there is no significant difference in patterns with high occurrence frequency.
- a plurality of types of conversion tables table1 are created in advance using a plurality of contents, stored in the control unit 14, and appropriately selected to perform compression encoding. It can be configured.
- the control unit 14 functions as a storage unit that stores a plurality of types of conversion tables table1 created in advance.
- the ADC 12 that performs ⁇ modulation may have different characteristics depending on the manufacturer that provides it. Therefore, the plurality of conversion tables table1 stored in the control unit 14 may correspond to a manufacturer that provides the ADC 12.
- the plurality of conversion tables table1 stored in advance in the control unit 14 are commonly held in the decoding side apparatus.
- the conversion table table1 of the transmission content itself is created and transmitted in real time in units of one frame.
- the conversion table of the transmission content itself is transmitted. It is not necessary to create table1.
- the control unit 14 selects a conversion table table1 most suitable for the DSD data supplied from the input buffer 13 from a plurality of conversion tables table1 stored in advance, and designates the selected conversion table table1.
- the designated data is supplied to the data transmitter 18.
- the data transmission unit 18 transmits the conversion table designation data to the partner apparatus together with the compressed data and the like instead of the conversion table data in the first embodiment.
- the control unit 14 sequentially supplies each of the plurality of conversion tables table1 to the encoding unit 15 for compression encoding, thereby confirming the compression rate of each of the plurality of conversion tables table1. Then, the control unit 14 supplies the conversion table table1 having the highest compression ratio to the encoding unit 15 as the conversion table table1 to be used, and also supplies the data transmission unit 18 with conversion table specification data for specifying the selected conversion table table1. To do.
- control unit 14 has, for example, the same encoding function as the encoding unit 15, compresses and encodes the DSD data supplied from the input buffer 13 by each of the plurality of conversion tables table 1, and converts the data with the highest compression rate.
- the table table1 may be determined.
- the timing for selecting one of the plurality of conversion tables table1 may be in units of frames or in units of contents. That is, after compression encoding with all the conversion tables table1 in only the first frame of the content to be transmitted and determining the conversion table table1 with the highest compression rate, the content is compressed and encoded with the same conversion table table1.
- the conversion table table1 having the highest compression ratio may be determined by compressing and encoding with all the conversion tables table1 in units of one frame or several frames.
- FIG. 11 illustrates a configuration example of the third embodiment of the decoding device according to the present disclosure.
- 11 is an apparatus that receives and decompresses (losslessly decodes) an audio signal that has been compression-encoded and transmitted by the compression-encoding apparatus 1 of FIG.
- the table storage unit 75 stores the compressed code of FIG.
- a plurality of conversion tables table1 conversion table table1-1, conversion table table1-2, conversion table table1-3 which are the same as those stored in the control unit 14 of the conversion apparatus 1 are stored.
- the data receiving unit 72 supplies the conversion table designation data included in the received data to the table storage unit 75.
- the table storage unit 75 decodes the conversion table table1 (one of the conversion table table1-1, the conversion table table1-2, or the conversion table table1-3) indicated by the conversion table designation data supplied from the data receiving unit 72 74.
- the compression encoding device 1 compresses and transmits DSD data, and the decoding device 70 receives the transmission data that has been compressed and transmitted. Decrypt and output.
- the conversion table table1 used for compression encoding is stored in advance.
- FIG. 12 illustrates a configuration example of the fourth embodiment of the compression encoding device according to the present disclosure.
- the control unit 14 includes: In addition to the same first conversion table table1 as the conversion table table1, the second conversion table table2 is also created.
- the control unit 14 supplies the created first conversion table table1 and second conversion table table2 to the encoding unit 15 and the data transmission unit 18.
- the first conversion table table1 and the second conversion table table2 are collectively referred to as a two-stage conversion table table.
- the compression coding apparatus 1 stores the top three values of the occurrence frequency from the data generation count table pretable in the conversion table table1, and otherwise, the next to “00b”. D4 data was added as is and transmitted in 6 bits.
- a second conversion table table2 for storing the fourth to sixth highest values of occurrence frequency is further created from the data generation count table pretable.
- FIG. 13 shows an example of the second conversion table table2 [4096] [3] created from the data generation count table pretable shown in FIG.
- the fourth value of the occurrence frequency is “9” that occurred 12 times, and the occurrence frequency
- the fifth value is “6” generated 11 times, and the sixth value is “2” generated 10 times.
- the case where the encoding unit 15 encodes D4 [n] will be described.
- the encoding unit 15 converts the previous 12-bit data D4 [n-3], D4 [n-2], and D4 [n-1] immediately before 12 into a group of 12 bits.
- the encoding unit 15 has three values of the address (row) indicated by D4 [n-3], D4 [n-2], D4 [n-1], table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [0], table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [2] Is the same as D4 [n], If table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [0] is the same, D4 [n] is converted to “01b” and 2 bits, If the same as table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], D4 [n] is converted to “10b” and 2 bits, If it is the same as table1 [D4 [n-3], D4 [n-2], D4 [n-1]] [2], D4 [n] is converted to “11b”
- the encoding unit 15 includes three values of addresses (rows) indicated by D4 [n-3], D4 [n-2], and D4 [n-1] in the second conversion table table2 [4096] [3].
- table2 [D4 [n-3], D4 [n-2], D4 [n-1]] [0], table2 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], table2 [D4 [n-3], D4 [n-2], D4 [n-1]] [2] Is the same as D4 [n], If it is the same as table2 [D4 [n-3], D4 [n-2], D4 [n-1]] [0], D4 [n] is converted to “0001b” and 4 bits, If it is the same as table2 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], D4 [n] is converted to “0010b” and 4 bits, If it is the same as table2 [D4 [n-3], D4 [n-2],
- the encoding unit 15 adds “0000b” before D4 [n] and converts it to 8 bits, such as “0000b + D4 [n]”.
- “0001b”, “0010b”, “0011b”, “0000b + D4 [n]”, b represents binary notation.
- the encoding unit 15 can compress and encode the DSD data supplied from the input buffer 13 using both the first conversion table table1 and the second conversion table table2.
- the data amount comparison unit 17 compresses and compresses compressed data using both the DSD data supplied from the input buffer 13 and the first conversion table table1 and the second conversion table table2 supplied from the encoded data buffer 16. The data amount is compared, the smaller one is selected, and selection control data indicating which one is selected is supplied to the data transmission unit 18.
- the encoding unit 15 can also compress and encode DSD data using only the first conversion table table1 of the first conversion table table1 and the second conversion table table2.
- control unit 14 confirms the compression rate of compression encoding using only the first conversion table table1 and compression encoding using both the first conversion table table1 and the second conversion table table2. Then, the control unit 14 can supply the higher compression ratio to the encoding unit 15 as a conversion table table to be used and also to the data transmission unit 18.
- FIG. 14 illustrates a configuration example of the fourth embodiment of the decoding device according to the present disclosure.
- the table storage unit 75 stores the compressed code of FIG. The difference is that both the first conversion table table1 and the second conversion table table2 transmitted from the conversion apparatus 1 are stored.
- a decoding method using the first conversion table table1 and the second conversion table table2 performed by the decoding unit 74 according to the fourth embodiment will be described.
- the compressed data that has been compressed and transmitted by the compression encoding device 1 is ... E2 [n-3], E2 [n-2], E2 [n-1], E2 [n], E2 [n + 1], E2 [n + 2], E2 [n + 3], ...
- E2 [n] is decoded.
- the decoding unit 74 first determines the value of E2 [n].
- E2 [n + 1] is also “00b”
- the data is not mounted in the received second conversion table table2 [4096] [3], so the next 4 bits of E2 [n + 1]
- the data “E2 [n + 2] + E2 [n + 3]” is data to be decoded.
- E2 [n + 1] is “01b”, “10b”, or “11b”
- the data is mounted in the received second conversion table table2 [4096] [3].
- the second conversion table table2 [4096] [3] is referred to for decoding. Search for data that should be.
- the data to be decoded is the data stored in “table2 [D4 [n-3], D4 [n-2], D4 [n ⁇ 1]] [E2 [n + 1] ⁇ 1]”.
- E2 [n] is “01b”, “10b”, or “11b”
- the data is mounted in the received first conversion table table1 [4096] [3].
- Data to be decoded with reference to the first conversion table table1 [4096] [3] using the decoded 12-bit D4 data D4 [n-3], D4 [n-2], D4 [n-1] Search for.
- the data to be decoded is the data stored in “table1 [D4 [n-3], D4 [n-2], D4 [n ⁇ 1]] [E2 [n] ⁇ 1]”.
- the decoding unit 74 can decode (reversibly decode) the compressed data to the state before compression using the first conversion table table1 and the second conversion table table2.
- the compression encoding device 1 compresses and transmits DSD data
- the decoding device 70 receives the transmission data that has been compressed and transmitted, and is reversible. Decrypt and output.
- the first conversion table table1 and the second conversion table table2 themselves used for compression encoding are transmitted as transmission data.
- FIG. 15 illustrates a configuration example of the fifth embodiment of the compression encoding device according to the present disclosure.
- the compression coding apparatus 1 according to the fifth embodiment shown in FIG. 15 is different from the compression coding apparatus 1 according to the fourth embodiment shown in FIG. 12 in the second embodiment shown in FIG.
- the configuration of the conversion table compression unit 101 is added.
- the control unit 14 uses the first conversion table table1 and the second conversion table from one frame of DSD data, as in the fourth embodiment described above. Create table2.
- the conversion table compression unit 101 creates compressed conversion table data obtained by compressing the data of the first conversion table table1 and the second conversion table table2, and supplies the compressed data to the data transmission unit 18.
- FIG. 16 illustrates a configuration example of the fifth embodiment of the decoding device according to the present disclosure.
- 16 is an apparatus that receives and decompresses (losslessly decodes) an audio signal that has been compression-encoded and transmitted by the compression-encoding apparatus 1 of FIG.
- the conversion table decompression unit 111 performs decompression processing corresponding to the compression processing performed by the conversion table compression unit 101 in FIG. 15 on the compression conversion table data supplied from the data reception unit 72. By the expansion process, the first conversion table table1 and the second conversion table table2 are obtained. The obtained first conversion table table1 and second conversion table table2 are supplied to the table storage unit 75 and used for the decoding process performed by the decoding unit 74 as described in the fourth embodiment.
- the compression encoding device 1 compresses and transmits DSD data
- the decoding device 70 receives the transmission data transmitted after being compressed and encoded. Decrypt and output.
- the first conversion table table1 and the second conversion table table2 used for compression encoding are compressed and transmitted as transmission data.
- FIG. 17 illustrates a configuration example of the sixth embodiment of the compression encoding device according to the present disclosure.
- the compression encoding apparatus 1 according to the sixth embodiment shown in FIG. 17 includes a first conversion table table1 and a second conversion table table2 adopted by the compression encoding apparatus 1 according to the fourth embodiment shown in FIG.
- the two-stage conversion table has a configuration in which a plurality of types are prepared and stored in advance.
- the control unit 14 has three types of two-stage conversion table tables, specifically, the first conversion table table1-1 and the second conversion table table2-1.
- the first conversion table table1-2 and the second conversion table table2-2, and the first conversion table table1-3 and the second conversion table table2-3 are stored in advance.
- the control unit 14 selects the two-stage conversion table table most suitable for the DSD data supplied from the input buffer 13 from the three types of two-stage conversion table tables stored in advance, that is, the two-stage conversion table having the highest compression rate. Select the conversion table table. Then, the control unit 14 supplies conversion table designation data for designating the selected two-stage conversion table table to the data transmission unit 18.
- the one-stage conversion table table to be used can be determined by comparing the compression rates.
- FIG. 18 illustrates a configuration example of the sixth embodiment of the decoding device according to the present disclosure.
- 18 is an apparatus that receives and decompresses (losslessly decodes) an audio signal that has been compression-encoded and transmitted by the compression-encoding apparatus 1 of FIG.
- the table storage unit 75 includes the first conversion table table1-1 and the second conversion table table2-1, the first conversion table table1-2, the second conversion table table2-2, the first conversion table table1-3 and the first conversion table. 2 conversion table table2-3 is stored in advance.
- the data receiving unit 72 supplies the conversion table designation data included in the received data to the table storage unit 75.
- the table storage unit 75 supplies the one-stage conversion table table or the two-stage conversion table table indicated by the conversion table designation data supplied from the data receiving unit 72 to the decoding unit 74.
- the compression encoding device 1 compresses and transmits DSD data
- the decoding device 70 receives the transmission data that has been compressed and transmitted, and is reversible. Decrypt and output.
- the first conversion table table1 and the second conversion table table2 used for compression encoding are stored in advance.
- FIG. 19 illustrates a configuration example of the seventh embodiment of the compression encoding device according to the present disclosure.
- the configuration of the control unit 14 is the same as that of the fifth embodiment shown in FIG. That is, the control unit 14 creates a two-stage conversion table table, which is a first conversion table table1 and a second conversion table table2, from one frame of DSD data.
- the conversion table compression unit 101 generates compression conversion table data obtained by compressing the data of the generated first conversion table table1 and second conversion table table2, and supplies the compressed data to the data transmission unit 18.
- the encoding unit 15 includes a 12-bit reference encoding unit 141, a 16-bit reference encoding unit 142, and a 20-bit reference encoding unit 143. This is different from the fifth embodiment shown in FIG.
- the 12-bit reference encoding unit 141 is D4 [n-3], which is the previous 12-bit data, just like the compression encoding performed by the encoding unit 15 of the first to sixth embodiments.
- D4 [n-2] and D4 [n-1] are regarded as a group of 12-bit data, and D4 [n] is encoded.
- the 16-bit reference encoding unit 142 regards the previous 16-bit data immediately before as a group of 16-bit data, and encodes D4 [n].
- the 20-bit reference encoding unit 143 regards the previous 20-bit data immediately before as a group of 20-bit data, and encodes D4 [n].
- the compression encoding method of the 16-bit reference encoding unit 142 and the 20-bit reference encoding unit 143 is the same as that of the 12-bit reference encoding unit 141 except that the number of bits of past data to be referred to when encoding D4 [n] is different. It is.
- the data compression rate can be further improved by increasing the number of reference bits of past data to 16 bits or 20 bits instead of 12 bits.
- the number of reference bits of past data is increased, the data amount of the created conversion table table increases exponentially with respect to the number of reference bits of past data.
- 2 16 65536 patterns
- control unit 14 determines whether to use the 12-bit reference encoding unit 141, the 16-bit reference encoding unit 142, or the 20-bit reference encoding unit 143 by checking the compression rate, and between the other device. It can be determined according to the state of the communication line, such as network traffic intervening in the network. Alternatively, it may be determined according to a request from the counterpart device.
- FIG. 20 illustrates a configuration example of the seventh embodiment of the decoding device according to the present disclosure.
- 20 is an apparatus that receives and decompresses (losslessly decodes) an audio signal that has been compression-encoded and transmitted by the compression-encoding apparatus 1 of FIG.
- the decoding device 70 includes a decoding unit 74 corresponding to the 12-bit reference encoding unit 141, the 16-bit reference encoding unit 142, and the 20-bit reference encoding unit 143 of the compression encoding device 1 of FIG. Have. That is, the decoding unit 74 includes a 12-bit reference decoding unit 161, a 16-bit reference decoding unit 162, and a 20-bit reference decoding unit 163.
- the data (conversion table data) of the two-stage conversion table table used for the compression encoding of the DSD data in the compression encoding device 1 of FIG. 19 is received by the data reception unit 72 and expanded by the conversion table expansion unit 111. And stored in the table storage unit 75.
- the table storage unit 75 supplies the two-stage conversion table table supplied from the conversion table decompression unit 111 to the decoding unit 74.
- any one of the 12-bit reference decoding unit 161, the 16-bit reference decoding unit 162, and the 20-bit reference decoding unit 163 performs a decoding process based on the two-stage conversion table table supplied from the table storage unit 75. Execute. Since the number of reference bits of the past data is known from the difference in the data amount of the two-stage conversion table table, it is uniquely determined which decoding unit should be used for the decoding process.
- the compression encoding device 1 compresses and transmits DSD data
- the decoding device 70 receives the transmission data that has been compressed and transmitted, and is reversible. Decrypt and output.
- compression encoding is performed by selecting any of 12 bits, 16 bits, or 20 bits as the number of reference bits of past data, and two-stage conversion used for compression encoding is performed. Data of table table is compressed and transmitted.
- FIG. 21 illustrates a configuration example of the eighth embodiment of the compression encoding device according to the present disclosure.
- the encoding unit 15 has a 12-bit reference encoding unit 141, a 16-bit reference encoding unit 142, and 20 as in the seventh embodiment shown in FIG. A bit reference encoding unit 143 is included.
- the control unit 14 includes a 12-bit two-stage conversion table table used for encoding performed by the 12-bit reference encoding unit 141, a 16-bit two-stage conversion table table used for encoding performed by the 16-bit reference encoding unit 142, and a 20-bit reference.
- a 20-bit two-stage conversion table table used for encoding performed by the encoding unit 143 is stored in advance.
- the compression encoding apparatus 1 can select any of 12 bits, 16 bits, or 20 bits as the number of reference bits of past data, as in the seventh embodiment.
- the two-stage conversion table table is not created using the DSD data to be transmitted, but is configured to be stored in advance as in the sixth embodiment shown in FIG. .
- the control unit 14 selects the most frequently stored DSD data supplied from the input buffer 13 from a total of nine types (three types for each reference bit number ⁇ three types of reference bit number) of the two-stage conversion table table.
- a suitable two-stage conversion table table that is, a two-stage conversion table table having the highest compression rate is selected.
- compression ratios may be compared by performing compression encoding with all nine types, and a representative one two-stage conversion table table is represented by a predetermined one from each reference bit. It is also possible to extract and compare the compression rates of the reference bit numbers.
- the control unit 14 supplies the data transmission unit 18 with conversion table designation data for designating the selected two-stage conversion table table.
- FIG. 22 illustrates a configuration example of the eighth embodiment of the decoding device according to the present disclosure.
- 22 is a device that receives and decompresses (losslessly decodes) an audio signal that has been compressed and transmitted by the compression encoding device 1 of FIG.
- the decoding unit 74 corresponds to the 12-bit reference decoding unit 161 and the 16-bit reference corresponding to the 12-bit reference encoding unit 141, the 16-bit reference encoding unit 142, and the 20-bit reference encoding unit 143 of the compression encoding device 1 of FIG.
- a decoding unit 162 and a 20-bit reference decoding unit 163 are included.
- the table storage unit 75 has the same three types of two-stage conversion tables as those included in the control unit 14 of the compression encoding apparatus 1 in FIG. 21, that is, a 12-bit two-stage conversion table table, a 16-bit two-stage conversion table table, In addition, a 20-bit two-stage conversion table table is stored in advance.
- the data receiving unit 72 supplies the conversion table designation data included in the received data to the table storage unit 75.
- the table storage unit 75 supplies the decoding unit 74 with a two-stage conversion table table indicated by the conversion table designation data supplied from the data receiving unit 72.
- the decoding unit 74 Based on the two-stage conversion table table supplied from the table storage unit 75, the decoding unit 74 performs decoding by either the 12-bit reference decoding unit 161, the 16-bit reference decoding unit 162, or the 20-bit reference decoding unit 163. Execute the process.
- the compression encoding device 1 compresses and transmits DSD data
- the decoding device 70 receives the transmission data that has been compressed and transmitted, and is reversible. Decrypt and output.
- compression encoding is performed by selecting 12 bits, 16 bits, or 20 bits as the number of reference bits of past data, and two-stage conversion used for compression encoding is performed.
- the table table is stored in advance.
- FIG. 23 illustrates a configuration example of the ninth embodiment of the compression encoding device according to the present disclosure.
- the compression encoding apparatus 1 is configured to perform compression encoding using a one-stage conversion table table1.
- the compression encoding apparatus 1 is configured to perform compression encoding using the two-stage conversion table table of the first conversion table table1 and the second conversion table table2.
- the compression encoding apparatus 1 of the ninth embodiment shown in FIG. 23 is a configuration example that performs compression encoding using a Q-stage conversion table table having three or more stages (Q is an integer of Q> 2). ).
- control unit 14 creates a Q-stage conversion table table from the first conversion table table1 to the Q-th conversion table tableQ, and supplies it to the encoding unit 15.
- the encoding unit 15 compresses and encodes the DSD data supplied from the input buffer 13 in units of 4 bits using the Q-stage conversion table table supplied from the control unit 14.
- the conversion unit is 4 bits, and one conversion table table is created (registered) from the first conversion table table1 in descending order of occurrence frequency, so the maximum value of Q in the present embodiment Becomes 5.
- the configuration of compression encoding for creating the first conversion table table1 to the third conversion table table3, the first conversion table table1 to the fourth conversion table table4, A configuration of compression encoding by creating a first conversion table table1 to a fifth conversion table table5 can be considered.
- the first conversion table table1 stores the first to third values of the occurrence frequency
- the second conversion table table2 has the occurrence frequency.
- the fourth to sixth values are stored
- the third conversion table table3 stores the seventh to ninth occurrence frequencies
- the fourth conversion table table4 includes the tenth to twelfth occurrence frequencies.
- the value is stored
- the fifth conversion table table5 stores the 13th to 15th values of the occurrence frequency.
- FIG. 24 illustrates a configuration example of the ninth embodiment of the decoding device according to the present disclosure.
- 24 is an apparatus that receives and decompresses (losslessly decodes) an audio signal that has been compression-encoded and transmitted by the compression-encoding apparatus 1 of FIG.
- the table storage unit 75 stores the first conversion table table1 to the Qth conversion table tableQ received by the data receiving unit 72 and expanded by the conversion table expansion unit 111, and supplies the first conversion table tableQ to the decoding unit 74.
- the decoding unit 74 performs decoding using the first conversion table table1 to the Qth conversion table tableQ.
- the case where the encoding unit 15 encodes D4 [n] will be described.
- the part from the first conversion table table1 to the second conversion table table2 until the same value as D4 [n] is searched is the same as the compression encoding method using the two-stage conversion table table described in the fourth embodiment. is there.
- the encoding unit 15 searches whether there is the same value as D4 [n] in the first conversion table table1 [4096] [3] and the second conversion table table2 [4096] [3]. If the same value as D4 [n] is found in the first conversion table table1 [4096] [3], it is converted to 2 bits of “01b”, “10b”, or “11b” 2 If there is the same value in the conversion table table2 [4096] [3], it is converted into 4 bits of “0001b”, “0010b”, or “0011b”.
- D4 [n-3], D4 [n-2], D4 [n-1] have three values of the address (row) indicated by D4 [n-1]. If there is no same as n], the encoding unit 15 determines that D4 [n-3], D4 [n-2], and D4 [n-1] of the third conversion table table3 [4096] [3] Three values of the address (row) to indicate, table3 [D4 [n-3], D4 [n-2], D4 [n-1]] [0], table3 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], table3 [D4 [n-3], D4 [n-2], D4 [n-1]] [2] Search for.
- the encoding unit 15 includes three values of addresses (rows) indicated by D4 [n-3], D4 [n-2], and D4 [n-1] in the third conversion table table3 [4096] [3].
- table3 [D4 [n-3], D4 [n-2], D4 [n-1]] [0] table3 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], table3 [D4 [n-3], D4 [n-2], D4 [n-1]] [2]
- Is the same as D4 [n] If the same as table3 [D4 [n-3], D4 [n-2], D4 [n-1]] [0], convert D4 [n] to “000001b” and 6 bits, If it is the same as table3 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], D4 [n] is converted to “000010b” and 6 bits, If it is the same as table3 [D4 [n-3], D4 [n-2], D
- the encoding unit 15 uses the three values of the addresses (rows) indicated by D4 [n-3], D4 [n-2], and D4 [n-1] in the third conversion table table3 [4096] [3]. If there is no same thing, “000000b” is added before D4 [n] and converted to 10 bits, such as “000000b + D4 [n]”.
- the compressed data that has been compressed and transmitted by the compression encoding device 1 is ... E2 [n-3], E2 [n-2], E2 [n-1], E2 [n], E2 [n + 1], E2 [n + 2], E2 [n + 3], ...
- E2 [n] is decoded.
- the decoding unit 74 refers to the first conversion table table1 [4096] [3] and “table1 [D4 [n-3] , D4 [n-2], D4 [n-1]] [E2 [n] -1] ”.
- the decoding unit 74 refers to the received second conversion table table2 [4096] [3] and “table2 [D4 [n-3], D4 [n-2], D4 [n-1]] [E2 [n + 1] -1] ”are decoded into data.
- the decoding unit 74 stores E2 [n + 2]. Determine the value.
- the decoding unit 74 refers to the received third conversion table table3 [4096] [3] and “table3 [D4 [n-3], D4 [n-2], D4 [n-1]] [E2 [n + 2] -1] ”are decoded into data.
- E2 [n + 2] is also “00b”
- the decoding unit 74 uses E2 [n + 2].
- the next 4-bit data “E2 [n + 3] + E2 [n + 4]” is the data to be decoded.
- the portion from the first conversion table table1 to the third conversion table table3 until the same value as D4 [n] is searched is the same as the compression encoding method using the above-described three-stage conversion table table, and the description thereof is omitted. .
- D4 [n-3], D4 [n-2], and D4 [n-1] have three values of the address (row) indicated by D4 [n-1]. If there is no same as n], the encoding unit 15 determines that D4 [n-3], D4 [n-2], and D4 [n-1] of the fourth conversion table table4 [4096] [3] Three values of the address (row) to indicate, table4 [D4 [n-3], D4 [n-2], D4 [n-1]] [0], table4 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], table4 [D4 [n-3], D4 [n-2], D4 [n-1]] [2] Search for.
- the encoding unit 15 includes three values of addresses (rows) indicated by D4 [n-3], D4 [n-2], and D4 [n-1] in the fourth conversion table table4 [4096] [3].
- table4 [D4 [n-3], D4 [n-2], D4 [n-1]] [0] table4 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], table4 [D4 [n-3], D4 [n-2], D4 [n-1]] [2]
- Is the same as D4 [n] If the same as table4 [D4 [n-3], D4 [n-2], D4 [n-1]] [0], D4 [n] is converted to “00000001b” and 8 bits, If the same as table4 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], D4 [n] is converted to “00000010b” and 8 bits, If it is the same as table4 [D4 [n-3], D4 [n-2],
- the encoding unit 15 has three values of addresses (rows) indicated by D4 [n-3], D4 [n-2], and D4 [n-1] in the fourth conversion table table4 [4096] [3]. If there is no same item, add “00000000b” in front of D4 [n] and convert it to 12 bits, such as “00000000b + D4 [n]”.
- E2 [n] is “00b”, “01b”, “10b”, or “11b”
- E2 [n + 1] is “00b”, “01b”, “10b”, or “11b”
- the case where E2 [n + 2] is “01b”, “10b”, or “11b” is the same as the decoding method using the above-described three-stage conversion table table, and thus the description thereof is omitted.
- the decoding unit 74 refers to the received fourth conversion table table4 [4096] [3] and “table4 [D4 [n-3], D4 [n-2], D4 [n-1]] [E2 [n + 3] -1] ”are decoded into data.
- E2 [n + 3] is also “00b”
- the data is not mounted on the received fourth conversion table table4 [4096] [3], so the decoding unit 74 uses E2 [n + 3].
- the next 4-bit data “E2 [n + 4] + E2 [n + 5]” is the data to be decoded.
- the part from the first conversion table table1 to the fourth conversion table table4 until the same value as D4 [n] is searched is the same as the compression encoding method using the above-described four-stage conversion table table, and the description is omitted. .
- the encoding unit 15 includes three values of addresses (rows) indicated by D4 [n-3], D4 [n-2], and D4 [n-1] in the fifth conversion table table5 [4096] [3].
- table5 [D4 [n-3], D4 [n-2], D4 [n-1]] [0] table5 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], table5 [D4 [n-3], D4 [n-2], D4 [n-1]] [2]
- Is the same as D4 [n] If the same as table5 [D4 [n-3], D4 [n-2], D4 [n-1]] [0], D4 [n] is converted to “0000000001b” and 10 bits, If it is the same as table5 [D4 [n-3], D4 [n-2], D4 [n-1]] [1], D4 [n] is converted to “0000000010b” and 10 bits, If it is the same as table5 [D4 [n-3], D4 [n
- the encoding unit 15 uses the three values of the addresses (rows) indicated by D4 [n-3], D4 [n-2], and D4 [n-1] in the fifth conversion table table5 [4096] [3]. If there is no same item, “0000000000b” is added before D4 [n] and converted to 14 bits, such as “0000000000b + D4 [n]”.
- E2 [n] is “00b”, “01b”, “10b”, or “11b”
- E2 [n + 1] is “00b”, “01b”, “10b”, or “11b”
- E2 [n + 2] is “00b”, “01b”, “10b”, or “11b”, and
- E2 [n + 3] is “01b”, “10b”, or “11b” is the same as the decoding method based on the above-described four-stage conversion table table, and thus the description thereof is omitted.
- the decoding unit 74 refers to the received fifth conversion table table5 [4096] [3] and “table5 [D4 [n-3], D4 [n-2], D4 [n-1]] [E2 [n + 4] -1] ”are decoded into data.
- E2 [n + 4] is also “00b”
- the decoding unit 74 uses E2 [n + 4].
- the next 4-bit data “E2 [n + 5] + E2 [n + 6]” is the data to be decoded.
- the number of reference bits of past data is 12 bits.
- the number of past reference bits is set to 16 bits, 20 bits, or the like. Can be done.
- the compression encoding device 1 compresses and transmits DSD data
- the decoding device 70 receives the transmission data that has been compressed and transmitted, and is reversible. Decrypt and output.
- the data of the Q stage conversion table table used for compression encoding is compressed and transmitted as transmission data.
- FIG. 25 shows the compression rate when a plurality of contents are compression-encoded by changing the number of stages of the conversion table table and the number of reference bits of past data.
- the compression rate is maximum, and the value at that time (maximum value) is 50%.
- the compression rate is improved as the number of stages of the conversion table table is increased from 1 to 2, and (3). Even when the number of reference bits of the past data is increased from 12 bits to 20 bits, the compression rate is slightly improved.
- FIG. 26 illustrates a configuration example of the tenth embodiment of the compression encoding device according to the present disclosure.
- control unit 14 performs the first conversion table table1 to the Qth conversion based on the previously generated data generation count table pretable.
- a table tableQ is created and supplied to the encoding unit 15.
- the encoding unit 15 includes a 4to2 encoding unit 181 and a 4to1 encoding unit 182.
- the 4to2 encoding unit 181 refers to the Q-stage conversion table and performs compression encoding for converting DSD data in units of 4 bits into 2 bits, as in the ninth embodiment.
- the maximum value of Q is 5, but any number of stages from 1 to 5 can be employed.
- the 4to1 encoding unit 182 refers to the Q-stage conversion table, and performs compression encoding that converts DSD data in units of 4 bits into 1 bit.
- the maximum value of Q is 16, but any number of stages from 1 to 16 can be employed.
- the control unit 14 determines whether the 4to2 encoding unit 181 or the 4to1 encoding unit 182 performs compression encoding, and based on the data generation count table pretable created earlier, the first conversion table table1 to the Qth conversion table tableQ. Can be created.
- control unit 14 determines whether the 4to2 encoding unit 181 or the 4to1 encoding unit 182 performs compression encoding based on the compression rate when the first one frame of DSD data is compression encoded by both. Alternatively, it may be determined based on user settings on a setting screen or the like, or designation from the counterpart device.
- the number of stages in the conversion table table can be determined as appropriate.
- FIG. 27 illustrates a configuration example of the tenth embodiment of the decoding device according to the present disclosure.
- 27 is an apparatus that receives and decompresses (losslessly decodes) an audio signal that has been compression-encoded and transmitted by the compression-encoding apparatus 1 of FIG.
- the table storage unit 75 stores the first conversion table table1 to the Qth conversion table tableQ received by the data receiving unit 72 and expanded by the conversion table expansion unit 111, and supplies the first conversion table tableQ to the decoding unit 74.
- the decoding unit 74 includes a 4to2 decoding unit 191 and a 4to1 decoding unit 192 corresponding to the 4to2 encoding unit 181 and the 4to1 encoding unit 182 of the compression encoding device 1 of FIG.
- the decoding unit 74 executes the decoding process by either the 4to2 decoding unit 191 or the 4to1 decoding unit 192 based on the Q-stage conversion table table supplied from the table storage unit 75.
- each element [0] to [4095] of the first conversion table table1 [4096] corresponds to a value that can be taken by the past three D4 data. Of the 16 values that can be taken by the D4 data, the most frequently occurring (first) value is stored.
- FIG. 28 shows an example of the first conversion table table1 [4096] when compression encoding is performed by the 4to1 encoding unit 182.
- pretable [117] [0] to [117] [15] which is the 118th line of the data generation count table pretable
- the value with the highest occurrence frequency (first) is Therefore, ⁇ 05 ⁇ is stored in the 118th element of the first conversion table table1 [4096].
- FIG. 29 shows an example of the second conversion table table2 [4096] when compression encoding is performed by the 4to1 encoding unit 182.
- pretable [117] [0] to [117] [15] which is the 118th line of the data generation count table pretable
- the second occurrence frequency value is generated 20 times. Therefore, ⁇ 04 ⁇ is stored in the 118th element of the second conversion table table1 [4096].
- the DSD data supplied from the input buffer 13 is D4 [n-3], D4 [n-2], D4 [n-1], D4 [n], D4 [n + 1], D4 [n + 2], D4 [n + 3], ...
- the case where the encoding unit 15 encodes D4 [n] will be described.
- the encoding unit 15 converts the previous 12-bit data D4 [n-3], D4 [n-2], and D4 [n-1] immediately before 12 into a group of 12 bits. Assuming bit data, the value of the address indicated by D4 [n-3], D4 [n-2], D4 [n-1] in the first conversion table table1 [4096], that is, table1 [D4 [n-3], D4 [n-2], D4 [n-1]] Whether the value stored in is the same as D4 [n] is determined.
- the decoding unit 74 first determines the value of E1 [n].
- E1 [n] is “1b”
- the 12-bit D4 data D4 [n-3 decoded immediately before that ], D4 [n-2], D4 [n-1] are used to refer to the first conversion table table1 [4096] and retrieve data to be decoded.
- the data to be decoded is the data stored in “table1 [D4 [n-3], D4 [n-2], D4 [n-1]]”.
- the encoding unit 15 converts the previous 12-bit data D4 [n-3], D4 [n-2], and D4 [n-1] immediately before 12 into a group of 12 bits. Assuming bit data, the value of the address indicated by D4 [n-3], D4 [n-2], D4 [n-1] in the first conversion table table1 [4096], that is, table1 [D4 [n-3], D4 [n-2], D4 [n-1]] Whether the value stored in is the same as D4 [n] is determined.
- the decoding unit 74 first determines the value of E1 [n].
- the decoding unit 74 determines the value of E1 [n + 1] because the data is not mounted in the received first conversion table table1 [4096].
- E1 [n + 1] is also “0b”
- the data is not mounted in the received second conversion table table2 [4096], so the next 4-bit data “E1 [n + 1]” E1 [n + 2] + E1 [n + 3] + E1 [n + 4] + E1 [n + 5] ”is data to be decoded.
- E1 [n] is “1b”
- the 12-bit D4 data D4 [n-3 decoded immediately before that ], D4 [n-2], D4 [n-1] are used to refer to the first conversion table table1 [4096] and retrieve data to be decoded.
- the data to be decoded is the data stored in “table1 [D4 [n-3], D4 [n-2], D4 [n-1]]”.
- E1 [n + 1] is “1b”
- the second conversion table table2 [4096] is referenced to search for data to be decoded.
- the data to be decoded is the data stored in “table2 [D4 [n-3], D4 [n-2], D4 [n-1]]”.
- the parts from the first conversion table table1 to the fifteenth conversion table table15 that are searched for the same value as D4 [n] are the same as described above, and are omitted.
- the 16th conversion table table16 [ 4096] the address value indicated by D4 [n-3], D4 [n-2], D4 [n-1], that is, table16 [D4 [n-3], D4 [n-2], D4 [n-1]] Therefore, the encoding unit 15 converts D4 [n] into “0000000000000001b” and 16 bits.
- E1 [n] to E1 [n + 15] are all “0b”
- the received data is not mounted in any of the first conversion table table1 [4096] to the fifteenth conversion table table15 [4096]. Therefore, the data is mounted in the sixteenth conversion table table16 [4096]. Therefore, the 16th conversion table table16 [4096] should be referred to using the 12-bit D4 data D4 [n-3], D4 [n-2], D4 [n-1] decoded immediately before. Search for data.
- the data to be decoded is the data stored in “table16 [D4 [n-3], D4 [n-2], D4 [n-1]]”.
- the compression encoding apparatus 1 compresses and transmits DSD data
- the decoding apparatus 70 receives the transmission data transmitted after being compressed and encoded. Decrypt and output.
- either compression encoding that converts 4-bit DSD data into 2 bits or compression encoding that converts 4-bit DSD data into 1 bit can be selected.
- Data of the Q stage conversion table table used for compression encoding is compressed and transmitted as transmission data.
- FIG. 30 illustrates a configuration example of the eleventh embodiment of the compression encoding device according to the present disclosure.
- the encoding unit 15 includes a 4to2 encoding unit 181 and a 4to1 encoding unit 182 as in the tenth embodiment shown in FIG.
- the control unit 14 stores in advance a 4to2 conversion table table used for encoding performed by the 4to2 encoding unit 181 and a 4to1 conversion table table used for encoding performed by the 4to1 encoding unit 182.
- the compression coding apparatus 1 in the eleventh embodiment refers to the Q-stage conversion table as in the tenth embodiment, and performs compression coding that converts 4-bit DSD data into 2 bits. Although it has a configuration that can select either compression encoding that converts 4-bit DSD data to 1-bit, the Q-stage conversion table table is not created using the DSD data to be transmitted, but is shown in FIG. Similarly to the sixth embodiment and the like, it is configured to store in advance.
- the control unit 14 determines whether the 4to2 encoding unit 181 or the 4to1 encoding unit 182 performs compression encoding, and supplies the encoding unit 15 with the 4to2 conversion table table or the 4to1 conversion table table corresponding to the determination result.
- control unit 14 supplies the conversion table designation data for designating the selected conversion table table to the data transmission unit 18.
- FIG. 31 illustrates a configuration example of the eleventh embodiment of the decoding device according to the present disclosure.
- 31 is an apparatus that receives and decompresses (losslessly decodes) an audio signal that has been compression-encoded and transmitted by the compression-encoding apparatus 1 of FIG.
- the decoding unit 74 includes a 4to2 decoding unit 191 and a 4to1 decoding unit 192 corresponding to the 4to2 encoding unit 181 and the 4to1 encoding unit 182 of the compression encoding device 1 of FIG.
- the table storage unit 75 stores in advance the same 4to2 conversion table table and 4to1 conversion table table that the control unit 14 of the compression encoding device 1 of FIG. 30 has.
- the data receiving unit 72 supplies the conversion table designation data included in the received data to the table storage unit 75.
- the table storage unit 75 supplies either the 4to2 conversion table table or the 4to1 conversion table table indicated by the conversion table designation data supplied from the data receiving unit 72 to the decoding unit 74.
- the decoding unit 74 executes a decoding process by the 4to2 decoding unit 191 or the 4to1 decoding unit 192 based on the 4to2 conversion table table or the 4to1 conversion table table supplied from the table storage unit 75.
- the compression encoding device 1 compresses and transmits DSD data
- the decoding device 70 receives the transmission data that has been compressed and transmitted. Decrypt and output.
- either compression encoding that converts 4-bit DSD data into 2 bits or compression encoding that converts 4-bit DSD data into 1 bit can be selected.
- Data of the Q stage conversion table table used for compression encoding is stored in advance.
- FIG. 32 shows the processing results by the 4to2 encoding unit 181 and the 4to1 encoding unit 182.
- the 4to1 encoding unit 182 It can be seen that the compression rate can be further increased by compressing and encoding 4 bits into 1 bit.
- the digital signal (DSD data) ⁇ -modulated by the ADC 12 is converted into a 2-bit code using a data conversion table table based on the data generation frequency.
- DSD data digital signal
- a data conversion table table based on the data generation frequency.
- the compression encoding device 1 compresses and encodes, for example, by converting 8 bits into a 4-bit code, and the decoding device 70 decompresses the code encoded by the compression encoding device 1 (lossless decoding). ) Is also possible.
- the register 51 of the encoding unit 15 in FIG. 4 becomes 8-bit storage, and the register 54 is changed to 4-bit storage.
- the register 91 of the decoding unit 74 in FIG. 6 is stored in 4 bits, and the register 94 is changed to 8 bits.
- the compression coding apparatus 1 converts the M bits of the ⁇ -modulated digital signal into N bits (M> N) with reference to the first conversion table table1, and converts the N bits in the first conversion table table1.
- the encoding unit 15 that converts to N bits with reference to the second conversion table table2 is provided.
- the first conversion table table1 is a table that stores codes with the highest occurrence frequency (P-1) for the past bit patterns
- the second conversion table Table 2 is a table that stores the upper (P-1) codes whose occurrence frequency with respect to the past bit pattern is next to the first conversion table table1.
- the decoding device 70 refers to the first conversion table table1 to convert the M bits of the encoded data obtained by compressing and encoding the M bits of the ⁇ -modulated digital signal into N bits (M> N) by M bits. If the first conversion table table1 cannot convert to M bits, the second conversion table table2 is referred to and the decoding unit 74 decodes to M bits.
- the first conversion table table1 is a table that stores codes with the highest occurrence frequency (P-1) for the past bit patterns
- the second conversion table Table 2 is a table that stores the upper (P-1) codes whose occurrence frequency with respect to the past bit pattern is next to the first conversion table table1.
- the functions of the respective embodiments described in the first to tenth embodiments are not limited to the combinations described, and one of the functions of the respective embodiments.
- a form in which some or all of the functions are arbitrarily combined can be adopted. And arbitrarily combined functions are selected as appropriate according to various conditions such as user settings, network (communication line) traffic or capacity, device processing capacity (CPU power and memory capacity), and instructions from the receiving device. Can be executed.
- compression encoding is performed with a multi-stage conversion table table having a higher compression ratio of two or more stages. It is possible to switch to selecting compression encoding using only the conversion table.
- the compression encoding apparatus 1 transmits the data of the conversion table table created from the actual DSD data as it is or after being compressed.
- the conversion table table stored in advance may be used.
- the computer includes, for example, a general-purpose personal computer capable of executing various functions by installing various programs by installing a computer incorporated in dedicated hardware.
- FIG. 33 is a block diagram illustrating a configuration example of hardware of a computer that executes the above-described series of processes by a program.
- a CPU 201 In the computer, a CPU 201, a ROM (Read Only Memory) 202, and a RAM (Random Access Memory) 203 are connected to each other via a bus 204.
- a bus 204 In the computer, a CPU 201, a ROM (Read Only Memory) 202, and a RAM (Random Access Memory) 203 are connected to each other via a bus 204.
- An input / output interface 205 is further connected to the bus 204.
- An input unit 206, an output unit 207, a storage unit 208, a communication unit 209, and a drive 210 are connected to the input / output interface 205.
- the input unit 206 includes a keyboard, a mouse, a microphone, and the like.
- the output unit 207 includes a display, a speaker, and the like.
- the storage unit 208 includes a hard disk, a nonvolatile memory, and the like.
- the communication unit 209 includes a network interface and the like.
- the drive 210 drives a removable recording medium 211 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.
- the CPU 201 loads, for example, the program stored in the storage unit 208 to the RAM 203 via the input / output interface 205 and the bus 204 and executes the program. Is performed.
- the program can be installed in the storage unit 208 via the input / output interface 205 by attaching the removable recording medium 211 to the drive 210. Further, the program can be received by the communication unit 209 via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting, and can be installed in the storage unit 208. In addition, the program can be installed in the ROM 202 or the storage unit 208 in advance.
- the program executed by the computer may be a program that is processed in time series in the order described in this specification, or in parallel or at a necessary timing such as when a call is made. It may be a program for processing.
- the present disclosure can take a cloud computing configuration in which one function is shared by a plurality of devices via a network and is processed jointly.
- each step described in the above flowchart can be executed by one device or can be shared by a plurality of devices.
- the plurality of processes included in the one step can be executed by being shared by a plurality of apparatuses in addition to being executed by one apparatus.
- this indication can also take the following structures.
- the M bit of the ⁇ -modulated digital signal is converted to N bits (M> N) with reference to the first conversion table, and the second conversion table is used when the first conversion table cannot be converted to the N bits.
- An encoding unit for converting to N bits with reference to When the number of bit patterns of N bits is P is a table in which codes of the highest occurrence frequency (P-1) for past bit patterns are stored,
- the second conversion table is a table in which a higher-order (P-1) code having an occurrence frequency with respect to a past bit pattern is stored next to the first conversion table.
- the encoding unit converts the M bits into the N bits using a set of the first conversion table and the second conversion table selected from a plurality of any one of (1) to (4)
- (6) The compression encoding apparatus according to (5), wherein a set having the highest compression rate is selected from a plurality of sets of the first conversion table and the second conversion table stored in the storage unit.
- a plurality of types of the number of bits of the past bit pattern are prepared,
- the encoding unit converts the M bits into the N bits using a set of the first conversion table and the second conversion table having a predetermined number of bits selected from a plurality of bits.
- the encoding unit converts the M bits to the N bits with reference to a third conversion table when the second conversion table cannot convert the N bits;
- the third conversion table is a table in which higher-order (P-1) codes having the occurrence frequency with respect to a past bit pattern are stored next to the second conversion table. Any one of (1) to (7) Compression encoding device.
- the encoding unit includes a first encoding unit that converts M bits of the digital signal into the N bits, and a second encoding unit that converts M bits of the digital signal into N2 bits different from the N bits.
- the compression encoding apparatus according to any one of 1) to (8).
- a storage unit for storing a set of the first conversion table and the second conversion table for the first encoding unit, and a set of the first conversion table and the second conversion table for the second encoding unit;
- the compression coding apparatus according to (9) further provided.
- (11) The M bit of the ⁇ -modulated digital signal is converted to N bits (M> N) with reference to the first conversion table, and the second conversion table is used when the first conversion table cannot be converted to the N bits.
- the first conversion table is a table in which codes of the highest occurrence frequency (P-1) for past bit patterns are stored
- the second conversion table is a table in which a higher-order (P-1) code having an occurrence frequency with respect to a past bit pattern is stored next to the first conversion table.
- the first conversion table is a table in which codes of the highest occurrence frequency (P-1) for past bit patterns are stored
- the second conversion table is a table in which upper (P-1) codes having an occurrence frequency with respect to a past bit pattern are next to the first conversion table.
- the N bits of the encoded data obtained by compressing and encoding the M bits of the ⁇ -modulated digital signal into N bits are converted into the M bits with reference to a first conversion table, A decoding unit for decoding to the M bits with reference to a second conversion table when the conversion table cannot convert to the M bits in one conversion table;
- the first conversion table is a table in which codes of the highest occurrence frequency (P-1) for past bit patterns are stored
- the second conversion table is a table in which a higher-order (P-1) code having an occurrence frequency with respect to a past bit pattern is next to the first conversion table.
- a data receiving unit for receiving the encoded data; The decoding apparatus according to (13), wherein the data receiving unit also receives data of the first conversion table and the second conversion table together with the encoded data.
- a storage unit for storing a plurality of sets of the first conversion table and the second conversion table; The decoding device according to (13), wherein the decoding unit converts the N bits into the M bits using a set of the first conversion table and the second conversion table selected from a plurality of the conversion tables.
- the decoding unit refers to a third conversion table to convert the N bits to the M bits when the second conversion table cannot convert the M bits,
- the third conversion table is a table in which higher-order (P-1) codes having the frequency of occurrence with respect to a past bit pattern are stored next to the second conversion table. Any one of (13) to (16) Decoding device.
- the decoding unit includes: a first decoding unit that converts the N bits of the encoded data into the M bits; a second decoding unit that converts N2 bits different from the N bits of the encoded data into the M bits; The decoding device according to any one of (13) to (16).
- the N bits of the encoded data obtained by compressing and encoding the M bits of the ⁇ -modulated digital signal into N bits are converted into the M bits with reference to a first conversion table, If the conversion table cannot be converted into the M bits, the second conversion table is referenced to decode the M bits, When the number of bit patterns of N bits is P,
- the first conversion table is a table in which codes of the highest occurrence frequency (P-1) for past bit patterns are stored, The decoding method, wherein the second conversion table stores the upper (P-1) codes whose occurrence frequency with respect to a past bit pattern is next to the first conversion table.
- the N bits of the encoded data obtained by compressing and encoding the M bits of the ⁇ -modulated digital signal into N bits are converted into the M bits with reference to a first conversion table, If the conversion table cannot convert to the M bits, the second conversion table is referred to and the process of decoding to the M bits is executed.
- the first conversion table is a table in which codes of the highest occurrence frequency (P-1) for past bit patterns are stored
- the second conversion table is a table in which upper (P-1) codes having an occurrence frequency with respect to a past bit pattern are next to the first conversion table.
- 1 compression encoding device 14 control unit, 15 encoding unit, 18 data transmission unit, 53 conversion table processing unit, 70 decoding device, 72 data receiving unit, 74 decoding unit, 75 table storage unit, 93 conversion table processing unit, 111 Conversion table decompression unit, 141 12-bit reference encoding unit, 142 16-bit reference encoding unit, 143 20-bit reference encoding unit, 161 12-bit reference decoding unit, 162 16-bit reference decoding unit, 163 20-bit reference decoding unit, 181 4to2 encoding Part, 182 4to1 encoding part, 191 4to2 decoding part, 192 4to1 decoding part, 201 CPU, 202 ROM, 203 RAM, 206 input part, 207 output part, 208 Memory part, 209 communication part, 210 drive
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Abstract
Description
1.第1の実施の形態(基本構成例)
2.第2の実施の形態(変換テーブルデータを圧縮伝送する構成例)
3.第3の実施の形態(複数の変換テーブルから選択する構成例)
4.第4の実施の形態(2段変換テーブルを用いる構成例)
5.第5の実施の形態(2段変換テーブルを圧縮伝送する構成例)
6.第6の実施の形態(複数の2段変換テーブルから選択する構成例)
7.第7の実施の形態(複数の過去データ参照ビット数を選択する第1構成例)
8.第8の実施の形態(複数の過去データ参照ビット数を選択する第2構成例)
9.第9の実施の形態(Q段変換テーブルを圧縮伝送する構成例)
10.第10の実施の形態(4to2エンコード部と4to1エンコード部を有する第1構成例)
11.第11の実施の形態(4to2エンコード部と4to1エンコード部を有する第2構成例)
<圧縮符号化装置の構成例>
図1は、本開示に係る圧縮符号化装置の第1の実施の形態の構成例を示している。
次に、制御部14によるデータ発生カウントテーブルpretableの作成方法について説明する。
・・・D4[n-3],D4[n-2],D4[n-1],D4[n],D4[n+1],D4[n+2],D4[n+3],・・・
ここで、D4[n]は、4ビットの連続データを表し、以下では、D4データともいう(n>3)。
次に、制御部14による変換テーブルtable1の作成方法について説明する。
次に、エンコード部15による、変換テーブルtable1を用いた圧縮符号化方法について説明する。
・・・D4[n-3],D4[n-2],D4[n-1],D4[n],D4[n+1],D4[n+2],D4[n+3],・・・
のうち、エンコード部15が、D4[n]を符号化する場合について説明する。
table1[D4[n-3],D4[n-2],D4[n-1]][0],
table1[D4[n-3],D4[n-2],D4[n-1]][1],
table1[D4[n-3],D4[n-2],D4[n-1]][2]
を検索する。
table1[D4[n-3],D4[n-2],D4[n-1]][0],
table1[D4[n-3],D4[n-2],D4[n-1]][1],
table1[D4[n-3],D4[n-2],D4[n-1]][2]
のなかにD4[n]と同じものがあり、
table1[D4[n-3],D4[n-2],D4[n-1]][0]と同じ場合は、D4[n]を“01b”と2ビットに変換し、
table1[D4[n-3],D4[n-2],D4[n-1]][1]と同じ場合は、D4[n]を“10b”と2ビットに変換し、
table1[D4[n-3],D4[n-2],D4[n-1]][2]と同じ場合は、D4[n]を“11b”と2ビットに変換する。
“00b+ D4[n]”のように、D4[n]の前に“00b”をつけて6ビットに変換する。ここで、“01b”、“10b”、“11b”、“00b+ D4[n]”のbは、2進表記であることを表す。
図4は、上述した圧縮符号化を行うエンコード部15の構成例を示す図である。
table1[D4[n-3],D4[n-2],D4[n-1]][0],
table1[D4[n-3],D4[n-2],D4[n-1]][1],
table1[D4[n-3],D4[n-2],D4[n-1]][2]
のなかに、レジスタ51に格納されている4ビットのデータ(例えば、D4[n])があるか否かを検索し、ある場合には、同じ値が格納されている列に対応する値、即ち、“01b”、“10b”、または“11b”のいずれかを、2ビットのレジスタ54に記憶させる。2ビットのレジスタ54に記憶されたデータは、セレクタ55の1つの入力端子56cに供給される。
図5のフローチャートを参照して、圧縮符号化装置1による圧縮符号化処理について説明する。
図6は、本開示に係る復号装置の第1の実施の形態の構成例を示している。
・・・E2[n-3],E2[n-2],E2[n-1],E2[n],E2[n+1],E2[n+2],E2[n+3],・・・
ここで、E2[n]は、2ビットの連続データを表し、E2データともいう。
図7のフローチャートを参照して、復号装置70の復号処理についてさらに説明する。
<圧縮符号化装置の構成例>
図8は、本開示に係る圧縮符号化装置の第2の実施の形態の構成例を示している。
図9は、本開示に係る復号装置の第2の実施の形態の構成例を示している。
<圧縮符号化装置の構成例>
図10は、本開示に係る圧縮符号化装置の第3の実施の形態の構成例を示している。
図11は、本開示に係る復号装置の第3の実施の形態の構成例を示している。
<圧縮符号化装置の構成例>
図12は、本開示に係る圧縮符号化装置の第4の実施の形態の構成例を示している。
第4の実施の形態のエンコード部15による、第1変換テーブルtable1と第2変換テーブルtable2を用いた圧縮符号化方法について説明する。
・・・D4[n-3],D4[n-2],D4[n-1],D4[n],D4[n+1],D4[n+2],D4[n+3],・・・
のうち、エンコード部15が、D4[n]を符号化する場合について説明する。
table1[D4[n-3],D4[n-2],D4[n-1]][0],
table1[D4[n-3],D4[n-2],D4[n-1]][1],
table1[D4[n-3],D4[n-2],D4[n-1]][2]
を検索する。
table1[D4[n-3],D4[n-2],D4[n-1]][0],
table1[D4[n-3],D4[n-2],D4[n-1]][1],
table1[D4[n-3],D4[n-2],D4[n-1]][2]
のなかにD4[n]と同じものがあり、
table1[D4[n-3],D4[n-2],D4[n-1]][0]と同じ場合は、D4[n]を“01b”と2ビットに変換し、
table1[D4[n-3],D4[n-2],D4[n-1]][1]と同じ場合は、D4[n]を“10b”と2ビットに変換し、
table1[D4[n-3],D4[n-2],D4[n-1]][2]と同じ場合は、D4[n]を“11b”と2ビットに変換する。
table2[D4[n-3],D4[n-2],D4[n-1]][0],
table2[D4[n-3],D4[n-2],D4[n-1]][1],
table2[D4[n-3],D4[n-2],D4[n-1]][2]
を検索する。
table2[D4[n-3],D4[n-2],D4[n-1]][0],
table2[D4[n-3],D4[n-2],D4[n-1]][1],
table2[D4[n-3],D4[n-2],D4[n-1]][2]
のなかにD4[n]と同じものがあり、
table2[D4[n-3],D4[n-2],D4[n-1]][0]と同じ場合は、D4[n]を“0001b”と4ビットに変換し、
table2[D4[n-3],D4[n-2],D4[n-1]][1]と同じ場合は、D4[n]を“0010b”と4ビットに変換し、
table2[D4[n-3],D4[n-2],D4[n-1]][2]と同じ場合は、D4[n]を“0011b”と4ビットに変換する。
図14は、本開示に係る復号装置の第4の実施の形態の構成例を示している。
・・・E2[n-3],E2[n-2],E2[n-1],E2[n],E2[n+1],E2[n+2],E2[n+3],・・・
として、E2[n]を復号する場合について説明する。
<圧縮符号化装置の構成例>
図15は、本開示に係る圧縮符号化装置の第5の実施の形態の構成例を示している。
図16は、本開示に係る復号装置の第5の実施の形態の構成例を示している。
<圧縮符号化装置の構成例>
図17は、本開示に係る圧縮符号化装置の第6の実施の形態の構成例を示している。
図18は、本開示に係る復号装置の第6の実施の形態の構成例を示している。
<圧縮符号化装置の構成例>
図19は、本開示に係る圧縮符号化装置の第7の実施の形態の構成例を示している。
図20は、本開示に係る復号装置の第7の実施の形態の構成例を示している。
<圧縮符号化装置の構成例>
図21は、本開示に係る圧縮符号化装置の第8の実施の形態の構成例を示している。
図22は、本開示に係る復号装置の第8の実施の形態の構成例を示している。
<圧縮符号化装置の構成例>
図23は、本開示に係る圧縮符号化装置の第9の実施の形態の構成例を示している。
図24は、本開示に係る復号装置の第9の実施の形態の構成例を示している。
第1変換テーブルtable1乃至第3変換テーブルtable3を用いた圧縮符号化方法について説明する。
・・・D4[n-3],D4[n-2],D4[n-1],D4[n],D4[n+1],D4[n+2],D4[n+3],・・・
のうち、エンコード部15が、D4[n]を符号化する場合について説明する。
table3[D4[n-3],D4[n-2],D4[n-1]][0],
table3[D4[n-3],D4[n-2],D4[n-1]][1],
table3[D4[n-3],D4[n-2],D4[n-1]][2]
を検索する。
table3[D4[n-3],D4[n-2],D4[n-1]][0],
table3[D4[n-3],D4[n-2],D4[n-1]][1],
table3[D4[n-3],D4[n-2],D4[n-1]][2]
のなかにD4[n]と同じものがあり、
table3[D4[n-3],D4[n-2],D4[n-1]][0]と同じ場合は、D4[n]を“000001b”と6ビットに変換し、
table3[D4[n-3],D4[n-2],D4[n-1]][1]と同じ場合は、D4[n]を“000010b”と6ビットに変換し、
table3[D4[n-3],D4[n-2],D4[n-1]][2]と同じ場合は、D4[n]を“000011b”と6ビットに変換する。
次に、第1変換テーブルtable1乃至第3変換テーブルtable3を用いた復号方法について説明する。
・・・E2[n-3],E2[n-2],E2[n-1],E2[n],E2[n+1],E2[n+2],E2[n+3],・・・
として、E2[n]を復号する場合について説明する。
次に、第1変換テーブルtable1乃至第4変換テーブルtable4を用いた圧縮符号化方法について説明する。
table4[D4[n-3],D4[n-2],D4[n-1]][0],
table4[D4[n-3],D4[n-2],D4[n-1]][1],
table4[D4[n-3],D4[n-2],D4[n-1]][2]
を検索する。
table4[D4[n-3],D4[n-2],D4[n-1]][0],
table4[D4[n-3],D4[n-2],D4[n-1]][1],
table4[D4[n-3],D4[n-2],D4[n-1]][2]
のなかにD4[n]と同じものがあり、
table4[D4[n-3],D4[n-2],D4[n-1]][0]と同じ場合は、D4[n]を“00000001b”と8ビットに変換し、
table4[D4[n-3],D4[n-2],D4[n-1]][1]と同じ場合は、D4[n]を“00000010b”と8ビットに変換し、
table4[D4[n-3],D4[n-2],D4[n-1]][2]と同じ場合は、D4[n]を“00000011b”と8ビットに変換する。
次に、第1変換テーブルtable1乃至第4変換テーブルtable4を用いた復号方法について説明する。
E2[n+1]が“00b”、“01b”、“10b”、または“11b”である場合、並びに、
E2[n+2]が“01b”、“10b”、または“11b”である場合については、上述した3段変換テーブルtableによる復号方法と同様であるので、説明は省略する。
次に、第1変換テーブルtable1乃至第5変換テーブルtable5を用いた圧縮符号化方法について説明する。
table5[D4[n-3],D4[n-2],D4[n-1]][0],
table5[D4[n-3],D4[n-2],D4[n-1]][1],
table5[D4[n-3],D4[n-2],D4[n-1]][2]
を検索する。
table5[D4[n-3],D4[n-2],D4[n-1]][0],
table5[D4[n-3],D4[n-2],D4[n-1]][1],
table5[D4[n-3],D4[n-2],D4[n-1]][2]
のなかにD4[n]と同じものがあり、
table5[D4[n-3],D4[n-2],D4[n-1]][0]と同じ場合は、D4[n]を“0000000001b”と10ビットに変換し、
table5[D4[n-3],D4[n-2],D4[n-1]][1]と同じ場合は、D4[n]を“0000000010b”と10ビットに変換し、
table5[D4[n-3],D4[n-2],D4[n-1]][2]と同じ場合は、D4[n]を“0000000011b”と10ビットに変換する。
次に、第1変換テーブルtable1乃至第5変換テーブルtable5を用いた復号方法について説明する。
E2[n+1]が“00b”、“01b”、“10b”、または“11b”である場合、
E2[n+2]が“00b”、“01b”、“10b”、または“11b”である場合、並びに、
E2[n+3]が“01b”、“10b”、または“11b”である場合については、上述した4段変換テーブルtableによる復号方法と同様であるので、説明は省略する。
図25は、変換テーブルtableの段数や、過去データの参照ビット数を変えて、複数のコンテンツについて圧縮符号化した場合の圧縮率を示している。
<圧縮符号化装置の構成例>
図26は、本開示に係る圧縮符号化装置の第10の実施の形態の構成例を示している。
図27は、本開示に係る復号装置の第10の実施の形態の構成例を示している。
次に、4to1エンコード部182による圧縮符号化を行う場合の、制御部14による変換テーブルtable1の作成方法について説明する。
次に、4to1エンコード部182による圧縮符号化方法と、4to1デコード部192による復号方法について説明する。
初めに、第1変換テーブルtable1のみを用いた圧縮符号化方法について説明する。
・・・D4[n-3],D4[n-2],D4[n-1],D4[n],D4[n+1],D4[n+2],D4[n+3],・・・
のうち、エンコード部15が、D4[n]を符号化する場合について説明する。
table1[D4[n-3],D4[n-2],D4[n-1]]
に格納されている値がD4[n]と同じであるかを判定する。
次に、第1変換テーブルtable1のみを用いた復号方法について説明する。
・・・E1[n-3],E1[n-2],E1[n-1],E1[n],E1[n+1],E1[n+2],E1[n+3],・・・
として、E1[n]を復号する場合について説明する。
次に、第1変換テーブルtable1と第2変換テーブルtable2を用いた圧縮符号化方法について説明する。
table1[D4[n-3],D4[n-2],D4[n-1]]
に格納されている値がD4[n]と同じであるかを判定する。
table2[D4[n-3],D4[n-2],D4[n-1]]
に格納されている値がD4[n]と同じであるかを判定する。
次に、第1変換テーブルtable1と第2変換テーブルtable2を用いた復号方法について説明する。
最後に、第1変換テーブルtable1乃至第16変換テーブルtable16を用いた圧縮符号化方法について説明する。
table16[D4[n-3],D4[n-2],D4[n-1]]
に格納されている値と同じはずであるので、エンコード部15は、D4[n]を“0000000000000001b”と16ビットに変換する。
次に、第1変換テーブルtable1乃至第16変換テーブルtable16を用いた復号方法について説明する。
<圧縮符号化装置の構成例>
図30は、本開示に係る圧縮符号化装置の第11の実施の形態の構成例を示している。
図31は、本開示に係る復号装置の第11の実施の形態の構成例を示している。
図32は、4to2エンコード部181と4to1エンコード部182による処理結果を示している。
上述した一連の処理は、ハードウエアにより実行することもできるし、ソフトウェアにより実行することもできる。本開示の圧縮伸長方法は、CPU(Central Processing Unit)のソフトウェア処理としては処理量が少ないので、機器の処理能力の軽重に左右されない。したがって、モバイル系の端末、据え置き系の機器等の機種依存性が少ない。
(1)
△Σ変調されたデジタル信号のMビットを、第1変換テーブルを参照してNビット(M>N)に変換し、前記第1変換テーブルでは前記Nビットに変換できない場合に、第2変換テーブルを参照して前記Nビットに変換するエンコード部を備え、
前記Nビットのビットパターン数をPとしたとき、
前記第1変換テーブルは、過去のビットパターンに対する発生頻度が上位(P-1)個のコードを記憶したテーブルであり、
前記第2変換テーブルは、過去のビットパターンに対する発生頻度が前記第1変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
圧縮符号化装置。
(2)
前記エンコード部により変換された変換データを送信するデータ送信部をさらに備え、
前記データ送信部は、前記変換データとともに、前記第1変換テーブルと前記第2変換テーブルのデータも送信する
前記(1)に記載の圧縮符号化装置。
(3)
前記第1変換テーブルと前記第2変換テーブルのデータを圧縮した圧縮変換テーブルデータを作成する変換テーブル圧縮部をさらに備え、
前記データ送信部は、前記第1変換テーブルと前記第2変換テーブルのデータとして、前記圧縮変換テーブルデータを送信する
前記(2)に記載の圧縮符号化装置。
(4)
前記第1変換テーブルと前記第2変換テーブルは、前記デジタル信号を用いて作成されたテーブルである
前記(1)乃至(3)のいずれかに記載の圧縮符号化装置。
(5)
前記第1変換テーブルと前記第2変換テーブルのセットを複数記憶する記憶部を備え、
前記エンコード部は、複数のなかから選択された前記第1変換テーブルと前記第2変換テーブルのセットを用いて、前記Mビットを前記Nビットに変換する
前記(1)乃至(4)のいずれかに記載の圧縮符号化装置。
(6)
前記記憶部に記憶されている複数の前記第1変換テーブルと前記第2変換テーブルのセットうち、圧縮率の最も高いセットが選択される
前記(5)に記載の圧縮符号化装置。
(7)
前記過去のビットパターンのビット数が、複数種類用意されており、
前記エンコード部は、複数のなかから選択された所定ビット数の前記第1変換テーブルと前記第2変換テーブルのセットを用いて、前記Mビットを前記Nビットに変換する
前記(1)乃至(6)のいずれかに記載の圧縮符号化装置。
(8)
前記エンコード部は、前記第2変換テーブルでは前記Nビットに変換できない場合に、第3変換テーブルを参照して前記Mビットを前記Nビットに変換し、
前記第3変換テーブルは、過去のビットパターンに対する発生頻度が前記第2変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
前記(1)乃至(7)のいずれかに記載の圧縮符号化装置。
(9)
前記エンコード部は、前記デジタル信号のMビットを前記Nビットに変換する第1エンコード部と、前記デジタル信号のMビットを前記Nビットと異なるN2ビットに変換する第2エンコード部とを有する
前記(1)乃至(8)のいずれかに記載の圧縮符号化装置。
(10)
前記第1エンコード部のための前記第1変換テーブルと前記第2変換テーブルのセットと、前記第2エンコード部のための前記第1変換テーブルと前記第2変換テーブルのセットを記憶する記憶部をさらに備える
前記(9)に記載の圧縮符号化装置。
(11)
△Σ変調されたデジタル信号のMビットを、第1変換テーブルを参照してNビット(M>N)に変換し、前記第1変換テーブルでは前記Nビットに変換できない場合に、第2変換テーブルを参照して前記Nビットに変換し、
前記Nビットのビットパターン数をPとしたとき、
前記第1変換テーブルは、過去のビットパターンに対する発生頻度が上位(P-1)個のコードを記憶したテーブルであり、
前記第2変換テーブルは、過去のビットパターンに対する発生頻度が前記第1変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
圧縮符号化方法。
(12)
コンピュータに、
△Σ変調されたデジタル信号のMビットを、第1変換テーブルを参照してNビット(M>N)に変換し、前記第1変換テーブルでは前記Nビットに変換できない場合に、第2変換テーブルを参照して前記Nビットに変換する処理を実行させ、
前記Nビットのビットパターン数をPとしたとき、
前記第1変換テーブルは、過去のビットパターンに対する発生頻度が上位(P-1)個のコードを記憶したテーブルであり、
前記第2変換テーブルは、過去のビットパターンに対する発生頻度が前記第1変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
プログラム。
(13)
△Σ変調されたデジタル信号のMビットがNビット(M>N)に圧縮符号化された符号化データの前記Nビットを、第1変換テーブルを参照して前記Mビットに変換し、前記第1変換テーブルでは前記Mビットに変換できない場合に、第2変換テーブルを参照して前記Mビットに復号するデコード部を備え、
前記Nビットのビットパターン数をPとしたとき、
前記第1変換テーブルは、過去のビットパターンに対する発生頻度が上位(P-1)個のコードを記憶したテーブルであり、
前記第2変換テーブルは、過去のビットパターンに対する発生頻度が前記第1変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
復号装置。
(14)
前記符号化データを受信するデータ受信部をさらに備え、
前記データ受信部は、前記符号化データとともに、前記第1変換テーブルと前記第2変換テーブルのデータも受信する
前記(13)に記載の復号装置。
(15)
前記第1変換テーブルと前記第2変換テーブルのセットを複数記憶する記憶部を備え、
前記デコード部は、複数のなかから選択された前記第1変換テーブルと前記第2変換テーブルのセットを用いて、前記Nビットを前記Mビットに変換する
前記(13)に記載の復号装置。
(16)
前記符号化データとともに、複数のなかから選択された前記第1変換テーブルと前記第2変換テーブルのセットを指定する変換テーブル指定データを受信するデータ受信部をさらに備える
前記(15)に記載の復号装置。
(17)
前記デコード部は、前記第2変換テーブルでは前記Mビットに変換できない場合に、第3変換テーブルを参照して前記Nビットを前記Mビットに変換し、
前記第3変換テーブルは、過去のビットパターンに対する発生頻度が前記第2変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
前記(13)乃至(16)のいずれかに記載の復号装置。
(18)
前記デコード部は、前記符号化データの前記Nビットを前記Mビットに変換する第1デコード部と、前記符号化データの前記Nビットと異なるN2ビットを前記Mビットに変換する第2デコード部とを有する
前記(13)乃至(16)のいずれかに記載の復号装置。
(19)
△Σ変調されたデジタル信号のMビットがNビット(M>N)に圧縮符号化された符号化データの前記Nビットを、第1変換テーブルを参照して前記Mビットに変換し、前記第1変換テーブルでは前記Mビットに変換できない場合に、第2変換テーブルを参照して前記Mビットに復号し、
前記Nビットのビットパターン数をPとしたとき、
前記第1変換テーブルは、過去のビットパターンに対する発生頻度が上位(P-1)個のコードを記憶したテーブルであり、
前記第2変換テーブルは、過去のビットパターンに対する発生頻度が前記第1変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
復号方法。
(20)
コンピュータに、
△Σ変調されたデジタル信号のMビットがNビット(M>N)に圧縮符号化された符号化データの前記Nビットを、第1変換テーブルを参照して前記Mビットに変換し、前記第1変換テーブルでは前記Mビットに変換できない場合に、第2変換テーブルを参照して前記Mビットに復号する処理を実行させ、
前記Nビットのビットパターン数をPとしたとき、
前記第1変換テーブルは、過去のビットパターンに対する発生頻度が上位(P-1)個のコードを記憶したテーブルであり、
前記第2変換テーブルは、過去のビットパターンに対する発生頻度が前記第1変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
プログラム。
Claims (20)
- △Σ変調されたデジタル信号のMビットを、第1変換テーブルを参照してNビット(M>N)に変換し、前記第1変換テーブルでは前記Nビットに変換できない場合に、第2変換テーブルを参照して前記Nビットに変換するエンコード部を備え、
前記Nビットのビットパターン数をPとしたとき、
前記第1変換テーブルは、過去のビットパターンに対する発生頻度が上位(P-1)個のコードを記憶したテーブルであり、
前記第2変換テーブルは、過去のビットパターンに対する発生頻度が前記第1変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
圧縮符号化装置。 - 前記エンコード部により変換された変換データを送信するデータ送信部をさらに備え、
前記データ送信部は、前記変換データとともに、前記第1変換テーブルと前記第2変換テーブルのデータも送信する
請求項1に記載の圧縮符号化装置。 - 前記第1変換テーブルと前記第2変換テーブルのデータを圧縮した圧縮変換テーブルデータを作成する変換テーブル圧縮部をさらに備え、
前記データ送信部は、前記第1変換テーブルと前記第2変換テーブルのデータとして、前記圧縮変換テーブルデータを送信する
請求項2に記載の圧縮符号化装置。 - 前記第1変換テーブルと前記第2変換テーブルは、前記デジタル信号を用いて作成されたテーブルである
請求項1に記載の圧縮符号化装置。 - 前記第1変換テーブルと前記第2変換テーブルのセットを複数記憶する記憶部を備え、
前記エンコード部は、複数のなかから選択された前記第1変換テーブルと前記第2変換テーブルのセットを用いて、前記Mビットを前記Nビットに変換する
請求項1に記載の圧縮符号化装置。 - 前記記憶部に記憶されている複数の前記第1変換テーブルと前記第2変換テーブルのセットうち、圧縮率の最も高いセットが選択される
請求項5に記載の圧縮符号化装置。 - 前記過去のビットパターンのビット数が、複数種類用意されており、
前記エンコード部は、複数のなかから選択された所定ビット数の前記第1変換テーブルと前記第2変換テーブルのセットを用いて、前記Mビットを前記Nビットに変換する
請求項1に記載の圧縮符号化装置。 - 前記エンコード部は、前記第2変換テーブルでは前記Nビットに変換できない場合に、第3変換テーブルを参照して前記Mビットを前記Nビットに変換し、
前記第3変換テーブルは、過去のビットパターンに対する発生頻度が前記第2変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
請求項1に記載の圧縮符号化装置。 - 前記エンコード部は、前記デジタル信号のMビットを前記Nビットに変換する第1エンコード部と、前記デジタル信号のMビットを前記Nビットと異なるN2ビットに変換する第2エンコード部とを有する
請求項1に記載の圧縮符号化装置。 - 前記第1エンコード部のための前記第1変換テーブルと前記第2変換テーブルのセットと、前記第2エンコード部のための前記第1変換テーブルと前記第2変換テーブルのセットを記憶する記憶部をさらに備える
請求項9に記載の圧縮符号化装置。 - △Σ変調されたデジタル信号のMビットを、第1変換テーブルを参照してNビット(M>N)に変換し、前記第1変換テーブルでは前記Nビットに変換できない場合に、第2変換テーブルを参照して前記Nビットに変換し、
前記Nビットのビットパターン数をPとしたとき、
前記第1変換テーブルは、過去のビットパターンに対する発生頻度が上位(P-1)個のコードを記憶したテーブルであり、
前記第2変換テーブルは、過去のビットパターンに対する発生頻度が前記第1変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
圧縮符号化方法。 - コンピュータに、
△Σ変調されたデジタル信号のMビットを、第1変換テーブルを参照してNビット(M>N)に変換し、前記第1変換テーブルでは前記Nビットに変換できない場合に、第2変換テーブルを参照して前記Nビットに変換する処理を実行させ、
前記Nビットのビットパターン数をPとしたとき、
前記第1変換テーブルは、過去のビットパターンに対する発生頻度が上位(P-1)個のコードを記憶したテーブルであり、
前記第2変換テーブルは、過去のビットパターンに対する発生頻度が前記第1変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
プログラム。 - △Σ変調されたデジタル信号のMビットがNビット(M>N)に圧縮符号化された符号化データの前記Nビットを、第1変換テーブルを参照して前記Mビットに変換し、前記第1変換テーブルでは前記Mビットに変換できない場合に、第2変換テーブルを参照して前記Mビットに復号するデコード部を備え、
前記Nビットのビットパターン数をPとしたとき、
前記第1変換テーブルは、過去のビットパターンに対する発生頻度が上位(P-1)個のコードを記憶したテーブルであり、
前記第2変換テーブルは、過去のビットパターンに対する発生頻度が前記第1変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
復号装置。 - 前記符号化データを受信するデータ受信部をさらに備え、
前記データ受信部は、前記符号化データとともに、前記第1変換テーブルと前記第2変換テーブルのデータも受信する
請求項13に記載の復号装置。 - 前記第1変換テーブルと前記第2変換テーブルのセットを複数記憶する記憶部を備え、
前記デコード部は、複数のなかから選択された前記第1変換テーブルと前記第2変換テーブルのセットを用いて、前記Nビットを前記Mビットに変換する
請求項13に記載の復号装置。 - 前記符号化データとともに、複数のなかから選択された前記第1変換テーブルと前記第2変換テーブルのセットを指定する変換テーブル指定データを受信するデータ受信部をさらに備える
請求項15に記載の復号装置。 - 前記デコード部は、前記第2変換テーブルでは前記Mビットに変換できない場合に、第3変換テーブルを参照して前記Nビットを前記Mビットに変換し、
前記第3変換テーブルは、過去のビットパターンに対する発生頻度が前記第2変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
請求項13に記載の復号装置。 - 前記デコード部は、前記符号化データの前記Nビットを前記Mビットに変換する第1デコード部と、前記符号化データの前記Nビットと異なるN2ビットを前記Mビットに変換する第2デコード部とを有する
請求項13に記載の復号装置。 - △Σ変調されたデジタル信号のMビットがNビット(M>N)に圧縮符号化された符号化データの前記Nビットを、第1変換テーブルを参照して前記Mビットに変換し、前記第1変換テーブルでは前記Mビットに変換できない場合に、第2変換テーブルを参照して前記Mビットに復号し、
前記Nビットのビットパターン数をPとしたとき、
前記第1変換テーブルは、過去のビットパターンに対する発生頻度が上位(P-1)個のコードを記憶したテーブルであり、
前記第2変換テーブルは、過去のビットパターンに対する発生頻度が前記第1変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
復号方法。 - コンピュータに、
△Σ変調されたデジタル信号のMビットがNビット(M>N)に圧縮符号化された符号化データの前記Nビットを、第1変換テーブルを参照して前記Mビットに変換し、前記第1変換テーブルでは前記Mビットに変換できない場合に、第2変換テーブルを参照して前記Mビットに復号する処理を実行させ、
前記Nビットのビットパターン数をPとしたとき、
前記第1変換テーブルは、過去のビットパターンに対する発生頻度が上位(P-1)個のコードを記憶したテーブルであり、
前記第2変換テーブルは、過去のビットパターンに対する発生頻度が前記第1変換テーブルに次ぐ上位(P-1)個のコードを記憶したテーブルである
プログラム。
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US10193565B2 (en) | 2019-01-29 |
JP6652123B2 (ja) | 2020-02-19 |
EP3267587A1 (en) | 2018-01-10 |
JPWO2016140071A1 (ja) | 2017-12-14 |
CN107431492A (zh) | 2017-12-01 |
CN107431492B (zh) | 2021-05-04 |
EP3267587A4 (en) | 2018-10-10 |
US20180115322A1 (en) | 2018-04-26 |
EP3267587B1 (en) | 2021-05-19 |
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