JP2833212B2 - Bit allocation method for band division coding - Google Patents
Bit allocation method for band division codingInfo
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- JP2833212B2 JP2833212B2 JP2333944A JP33394490A JP2833212B2 JP 2833212 B2 JP2833212 B2 JP 2833212B2 JP 2333944 A JP2333944 A JP 2333944A JP 33394490 A JP33394490 A JP 33394490A JP 2833212 B2 JP2833212 B2 JP 2833212B2
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- index
- samples included
- bit allocation
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Description
【発明の詳細な説明】 産業上の利用分野 本発明は、音楽信号並びに音声信号及び画像信号を圧
縮して符号化する際の帯域分割符号化のビット割当方法
に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bit allocation method for band division encoding when compressing and encoding a music signal, an audio signal, and an image signal.
従来の技術 従来の帯域分割符号化のビット割当方法においては、
ダウンサンプリング周波数と割当ビット数の積、すなわ
ち、帯域別伝送情報量がその帯域の明瞭度指数貢献度と
等しくなるようにビット数を割り当てていた。（例え
ば、中田和男者；「音声の高能率符号化」1986（56−61
頁）。2. Description of the Related Art In a conventional bit allocation method of band division coding,
The number of bits is allocated so that the product of the downsampling frequency and the number of allocated bits, that is, the amount of transmitted information for each band is equal to the clarity index contribution of the band. (For example, Kazuo Nakata; "Efficient Coding of Speech" 1986 (56-61)
page).
発明が解決しようとする課題 従来の帯域分割符号化のビット割当方法では、帯域別
情報量がその明瞭度指数貢献度と等しくなるようにビッ
トを割り当てており、情報を効率よく符号化するには有
効であった。しかしながら、音声や画像のように人間の
聴覚や視覚などの感覚によって認識されるものに対し
て、全部の情報を均一に符号化することは、人間の感覚
にとって重要な情報により多くのビットを割り当ててい
るとはいえず、限られた符号化容量を効率的に使用して
いるとは言えないという課題があった。In the conventional bit allocation method of band division coding, bits are allocated so that the amount of information per band is equal to the degree of clarity index contribution. To efficiently encode information, Was effective. However, for things that are perceived by the human sense of hearing and vision, such as speech and images, encoding all information uniformly allocates more bits to information that is important to the human sense. However, there is a problem that it cannot be said that the limited coding capacity is used efficiently.
本発明は上記課題を解決するもので限られた符号化容
量のなかで、人間の聴覚や視覚にとって重要な情報を効
率よく符号化するための帯域分割符号化のビット割当方
法を提供することを目的としている。The present invention solves the above problems, and provides a bit allocation method of band division encoding for efficiently encoding information important for human hearing and vision in a limited encoding capacity. The purpose is.
課題を解決するための手段 本発明は上記目的を達成するために、ディジタル信号
をＮ個の周波数帯域に分割するステップと、分割した前
記Ｎ個の帯域信号をそれぞれ低域周波数帯域信号に低域
変換するステップと、前記各低域周波数帯域信号を標本
化するステップと、前記各標本化信号を量子化するステ
ップとを含んでなり、前記各低域周波数帯域信号の符号
化に割り当てるビット数の総和をＢビットとし前記各低
域周波数帯域のｉ番目の帯域信号に割り当てるビット数
biを と定め、指標Xiをｉ番目の帯域に含まれる標本の中で振
幅の絶対値の最大値とする帯域分割符号化において、ｉ
番目の帯域に対して求められた指標をXi及びYiとし、あ
らかじめ定めたしきい値をTH、及びあらかじめ定めた重
みをＷとおき、 Yi≧TH の条件が満足されるとき、指標Xiを Xi×（１＋Ｗ） で置き換え、前記ｉ番目の帯域に割り当てるビット数bi
を定め、前記指標Yiをｉ番目の帯域に含まれる標本の中
で振幅の絶対値の最大値と、ｉ番目の帯域に含まれる標
本の振幅の絶対値の平均値との比とするものである。Means for Solving the Problems In order to achieve the above object, the present invention provides a method of dividing a digital signal into N frequency bands, and dividing each of the divided N band signals into a low frequency band signal. Converting, sampling each of the low frequency band signals, and quantizing each of the sampled signals, the number of bits to be allocated to the encoding of each of the low frequency band signals The number of bits to be assigned to the i-th band signal of each of the low frequency bands, with the sum being B bits
b i In the band division coding in which the index X i is the maximum value of the absolute value of the amplitude among the samples included in the i-th band, i
Let X i and Y i be the indices obtained for the th band, set a predetermined threshold to TH, and a predetermined weight to W, and when the condition of Y i ≧ TH is satisfied, X i is replaced by X i × (1 + W), and the number of bits b i allocated to the i-th band
The set, which the ratio between the average value of the absolute value of the amplitude of the sample contained and the maximum value of the absolute value of the amplitude, the i-th band in the sample contained the index Y i to i-th band It is.
作用 上記のような帯域分割符号化のビット割当方法を用い
て入力信号を符号化すると、人間の聴覚や視覚にとって
重要な情報が効率よく符号化できる。Effect When an input signal is encoded using the above-described bit allocation method of band division encoding, information important to human hearing and vision can be efficiently encoded.
実施例 以下本発明の一実施例について、図面を参照しながら
説明する。第１図は本発明の帯域分割符号化のビット割
当方法を説明するための、帯域分割の模式図である。図
は、あらかじめA/D変換された入力信号のサンプル系列
をＮ個の帯域に分割した様子を示すものである。１は入
力信号、２、３‥‥４は入力信号をＮ個の帯域に分割す
るための帯域分割フィルタ、５、６及び７は帯域分割さ
れた信号を模式的に表す。帯域分割された各々の信号は
ベースバンド帯域に低域変換し、それを帯域通過フィル
タの帯域幅から決まる標本化周波数でダウンサンプリン
グする。そしてダウンサンプリングされた結果を本発明
のビット割当方法で求めたビット数で符号化する。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of band division for explaining a bit allocation method of band division coding according to the present invention. The figure shows a state in which a sample sequence of an input signal that has been A / D converted in advance is divided into N bands. Reference numeral 1 denotes an input signal; 2, 3 ‥‥ 4, a band division filter for dividing the input signal into N bands; 5, 6, and 7 schematically represent band-divided signals. Each band-divided signal is down-converted into a base band and down-sampled at a sampling frequency determined by the bandwidth of the band-pass filter. Then, the result of the downsampling is encoded with the number of bits obtained by the bit allocation method of the present invention.
各々の周波数帯域に割り当てるビット数は、各々の周
波数帯域に含まれるサンプルから求めた指標をもとに決
定される。ブロック化された入力信号がＮ個の帯域に分
割されたとき、ｉ番目の帯域に対して求めた指標Xi及び
Yiとし、かつ各々の周波数帯域に割り当てるビット数の
総和をＢビットとすると、ｉ番目の帯域に割り当てられ
るビット数biは として定める。The number of bits allocated to each frequency band is determined based on an index obtained from a sample included in each frequency band. When the blocked input signal is divided into N bands, the indices X i obtained for the i-th band and
And Y i, and when the B bit sum of the number of bits allocated to each frequency band, the number of bits allocated to the i th band b i is Determined as
ただし、あらかじめ定めたしきい値をTH、及びあらか
じめ定めた重みをＷとし、 Yi≧TH の条件が満足されるとき、指標Xiを Xi×（１＋Ｗ） で置き換え、ｉ番目の帯域に割り当てられるビット数bi
を定める。これによってより特殊な入力信号に対して
も、効果のある符号化を行うことができる。However, when the predetermined threshold is TH and the predetermined weight is W, and when the condition of Y i ≧ TH is satisfied, the index X i is replaced by X i × (1 + W), and the i-th band is set. Number of allocated bits b i
Is determined. This makes it possible to perform an effective encoding even for a more specific input signal.
指標Xiの求め方としては、 １）ｉ番目の帯域に含まれるサンプルのうち、振幅の絶
対値の最大値 ２）ｉ番目の帯域に含まれるサンプルのうち、振幅の二
乗の最大値 ３）ｉ番目の帯域に含まれるサンプルの振幅の絶対値の
平均値 ４）ｉ番目の帯域に含まれるサンプルの振幅の二乗の平
均値 などを用いることができる。指標Xiは、人間の聴覚や視
覚にとって検知しやすいサンプルに、より多くのビット
数が割り当てられるように設定することが望ましく、上
に述べた指標Xiの求め方はこの要件を満たすものであ
る。The method of obtaining the index X i, 1) of the i th sample contained in the band, among the samples included in the maximum value 2) i-th band of the absolute value of the amplitude, the maximum value 3 of the square of the amplitude) Average value of the absolute value of the amplitude of the sample included in the i-th band 4) Average value of the square of the amplitude of the sample included in the i-th band can be used. The index X i is the detected easily samples for the human auditory and visual, it is desirable to set such that the number more bits are allocated, Determination of the index X i mentioned above meets this requirement is there.
また、指標Yiの求め方としては １）ｉ番目の帯域に含まれるサンプルのうち、振幅の絶
対値の最大値と、ｉ番目の帯域に含まれるサンプルの振
幅の絶対値の平均値との比 ２）ｉ番目の帯域に含まれるサンプルのうち、振幅の絶
対値の最大値と、ｉ番目の帯域に含まれるサンプルの振
幅の二乗の平均値との比 ３）ｉ番目の帯域に含まれるサンプルのうち、振幅の二
乗の最大値と、ｉ番目の帯域に含まれるサンプルの振幅
の絶対値の平均値との比 ４）ｉ番目の帯域に含まれるサンプルのうち、振幅の二
乗の最大値と、ｉ番目の帯域に含まれるサンプルの振幅
の二乗の平均値との比 などを用いることができる。Also, of the sample as a method of obtaining the index Y i included in the band of 1) the i-th, and the maximum value of the absolute value of the amplitude, the samples included in the i-th band and the average value of the absolute value of the amplitude Ratio 2) Ratio between the maximum value of the absolute value of the amplitude of the samples included in the i-th band and the average value of the squares of the amplitudes of the samples included in the i-th band 3) Included in the i-th band Ratio between the maximum value of the square of the amplitude of the sample and the average value of the absolute values of the amplitudes of the samples included in the i-th band. 4) The maximum value of the square of the amplitude among the samples included in the i-th band. And the average of the squares of the amplitudes of the samples included in the i-th band.
このように本発明の実施例の帯域分割符号化のビット
割当方法によれば、信号の性質に応じた適切なビット割
当ができ、さらに複雑な信号に対してもより適切なビッ
ト割当ができる。As described above, according to the bit allocation method of the band division coding according to the embodiment of the present invention, it is possible to perform appropriate bit allocation in accordance with the characteristics of a signal, and to perform more appropriate bit allocation for a more complicated signal.
発明の効果 本発明は、以上説明したような帯域分割符号化のビッ
ト割当方法を提供するものであって、以下に記述するよ
うな効果を奏する。すなわち、各々の周波数帯域に割り
当てる符号化ビット数を、各々の周波数帯域に含まれる
サンプルから求めた指標Xiをもとに決定するので、信号
の性質に応じて最適なビット割当ができる。The present invention provides a bit allocation method for band division coding as described above, and has the following effects. That is, the number of coding bits allocated to each frequency band, because it determines on the basis of the index X i determined from a sample contained in each frequency band, it is optimal bit allocation depending on the nature of the signal.
特に、ｉ番目の帯域に対して求められた指標をXiおよ
びYiとし、あらかじめ定めたしきい値をTH、及びあらか
じめ定めた重みをＷとすると、 Yi≧TH の条件が満足されるとき、指標Xiを Xi×（１＋Ｗ） で置き換えるので、複雑な信号に対しても、より適切な
ビット割当を行うことができる。In particular, if the indices obtained for the i-th band are X i and Y i , the predetermined threshold is TH, and the predetermined weight is W, the condition of Y i ≧ TH is satisfied. At this time, since the index X i is replaced by X i × (1 + W), more appropriate bit allocation can be performed even for a complicated signal.
第１図は本発明の帯域分割符号化のビット割当方法の一
実施例を説明するための帯域分割の模式図である。 ２……帯域分割フィルタ、１、３……帯域分割フィル
タ、２、４……帯域分割フィルタ・Ｎ。FIG. 1 is a schematic diagram of band division for explaining an embodiment of a bit allocation method for band division encoding according to the present invention. 2, band division filters, 1, 3, band division filters, 2, 4, band division filters, N
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) G10L 3/00 - 9/18 H03M 7/30 ＪＩＣＳＴ（ＪＯＩＳ)Continuation of the front page (58) Field surveyed (Int. Cl. 6 , DB name) G10L 3/00-9/18 H03M 7/30 JICST (JOIS)
Claims (16)
するステップと、分割した前記Ｎ個の帯域信号をそれぞ
れ低域周波数帯域信号に低域変換するステップと、前記
各低域周波数帯域信号を標本化するステップと、前記各
標本化信号を量子化するステップとを含んでなり、前記
各低域周波数帯域信号の符号化に割り当てるビット数の
総和をＢビットとし前記各低域周波数帯域のｉ番目の帯
域信号に割り当てるビット数biを と定め、指標Xiをｉ番目の帯域に含まれる標本の中で振
幅の絶対値の最大値とする帯域分割符号化において、ｉ
番目の帯域に対して求められた指標をXi及びYiとし、あ
らかじめ定めたしきい値をTH、及びあらかじめ定めた重
みをＷとおき、 Yi≧TH の条件が満足されるとき、指標Xiを Xi×（１＋Ｗ） で置き換え、前記ｉ番目の帯域に割り当てるビット数bi
を定め、前記指標Yiをｉ番目の帯域に含まれる標本の中
で振幅の絶対値の最大値と、ｉ番目の帯域に含まれる標
本の振幅の絶対値の平均値との比とする帯域分割符号化
のビット割当方法。A step of dividing the digital signal into N frequency bands; a step of down-converting each of the divided N band signals into a low-frequency band signal; Sampling, and quantizing each of the sampled signals, wherein the total number of bits allocated to the coding of each of the low frequency band signals is B bits, and i of each of the low frequency bands is the number of bits b i to be allocated to th band signal In the band division coding in which the index X i is the maximum value of the absolute value of the amplitude among the samples included in the i-th band, i
Let X i and Y i be the indices obtained for the th band, set a predetermined threshold to TH, and a predetermined weight to W, and when the condition of Y i ≧ TH is satisfied, X i is replaced by X i × (1 + W), and the number of bits b i allocated to the i-th band
And the index Y i is a ratio of the maximum value of the absolute value of the amplitude among the samples included in the i-th band to the average value of the absolute values of the amplitudes of the samples included in the i-th band. Bit allocation method for division coding.
で振幅の絶対値の最大値と、ｉ番目の帯域に含まれる標
本の振幅の二乗の平均値との比とする請求項（１）記載
の帯域分割符号化のビット割当方法。2. The method according to claim 1, wherein the index Y i is a ratio between the maximum value of the absolute value of the amplitude of the samples included in the i-th band and the average value of the square of the amplitude of the samples included in the i-th band. Item (1): A bit allocation method for band division coding.
で振幅の二乗の最大値と、ｉ番目の帯域に含まれる標本
の振幅の絶対値の平均値との比とする請求項（１）記載
の帯域分割符号化のビット割当方法。Wherein according to the ratio of the maximum value of the square of the amplitude in the sample contained an index Y i to i-th band, the average value of the absolute value of the amplitude of the sample contained in the i-th band Item (1): A bit allocation method for band division coding.
で振幅の二乗の最大値と、ｉ番目の帯域に含まれる標本
の振幅の二乗の平均値との比とする請求項（１）記載の
帯域分割符号化のビット割当方法。4. A claim that a ratio of the maximum value of the square of the amplitude in the sample contained an index Y i to i-th band, the mean value of the square of the amplitude of the sample contained in the i-th band (1) The bit allocation method of band division coding according to (1).
するステップと、分割した前記Ｎ個の帯域信号をそれぞ
れ低域周波数帯域信号に低域変換するステップと、前記
各低域周波数帯域信号を標本化するステップと、前記各
標本化信号を量子化するステップとを含んでなり、前記
各低域周波数帯域信号の符号化に割り当てるビット数の
総和をＢビットとし前記各低域周波数帯域のｉ番目の帯
域信号に割り当てるビット数biを と定め、指標Xiをｉ番目の帯域に含まれる標本の中で振
幅の二乗の最大値とする帯域分割符号化において、ｉ番
目の帯域に対して求められた指標をXi及びYiとし、あら
かじめ定めたしきい値をTH、及びあらかじめ定めた重み
をＷとおき、 Yi≧TH の条件が満足されるとき、指標Xiを Xi×（１＋Ｗ） で置き換え、前記ｉ番目の帯域に割り当てるビット数bi
を定め、前記指標Yiをｉ番目の帯域に含まれる標本の中
で振幅の絶対値の最大値と、ｉ番目の帯域に含まれる標
本の振幅の絶対値の平均値との比とする帯域分割符号化
のビット割当方法。5. A step of dividing a digital signal into N frequency bands, a step of down-converting each of the divided N band signals into a low frequency band signal, and converting each of the low frequency band signals. Sampling, and quantizing each of the sampled signals, wherein the total number of bits allocated to the coding of each of the low frequency band signals is B bits, and i of each of the low frequency bands is the number of bits b i to be allocated to th band signal In band division coding in which the index X i is the maximum value of the square of the amplitude in the samples included in the i-th band, the indices obtained for the i-th band are X i and Y i , A predetermined threshold is set to TH and a predetermined weight is set to W, and when the condition of Y i ≧ TH is satisfied, the index X i is replaced by X i × (1 + W), and the i-th band is set. Number of bits b i assigned to
And the index Y i is a ratio of the maximum value of the absolute value of the amplitude among the samples included in the i-th band to the average value of the absolute values of the amplitudes of the samples included in the i-th band. Bit allocation method for division coding.
で振幅の絶対値の最大値と、ｉ番目の帯域に含まれる標
本の振幅の二乗の平均値との比とする請求項（５）記載
の帯域分割符号化のビット割当方法。6. The method according to claim 1, wherein the index Y i is a ratio between the maximum value of the absolute value of the amplitude of the samples included in the i-th band and the average value of the square of the amplitude of the samples included in the i-th band. Item (5): A bit allocation method for band division encoding.
で振幅の二乗の最大値と、ｉ番目の帯域に含まれる標本
の振幅の絶対値の平均値との比とする請求項（５）記載
の帯域分割符号化のビット割当方法。7. A according to the ratio of the maximum value of the square of the amplitude in the sample contained an index Y i to i-th band, the average value of the absolute value of the amplitude of the sample contained in the i-th band Item (5): A bit allocation method for band division encoding.
で振幅の二乗の最大値と、ｉ番目の帯域に含まれる標本
の振幅の二乗の平均値との比とする請求項（５）記載の
帯域分割符号化のビット割当方法。8. A claim that a ratio of the maximum value of the square of the amplitude in the sample contained an index Y i to i-th band, the mean value of the square of the amplitude of the sample contained in the i-th band (5) The bit allocation method for band division coding according to (5).
するステップと、分割した前記Ｎ個の帯域信号をそれぞ
れ低域周波数帯域信号に低域変換するステップと、前記
各低域周波数帯域信号を標本化するステップと、前記各
標本化信号を量子化するステップとを含んでなり、前記
各低域周波数帯域信号の符号化に割り当てるビット数の
総和をＢビットとし前記各低域周波数帯域のｉ番目の帯
域信号に割り当てるビット数biを と定め、指標Xiをｉ番目の帯域に含まれる標本の振幅の
絶対値の平均値とする帯域分割符号化において、ｉ番目
の帯域に対して求められた指標をXi及びYiとし、あらか
じめ定めたしきい値をTH、及びあらかじめ定めた重みを
Ｗとおき、 Yi≧TH の条件が満足されるとき、指標Xiを Xi×（１＋Ｗ） で置き換え、前記ｉ番目の帯域に割り当てるビット数bi
を定め、前記指標Yiをｉ番目の帯域に含まれる標本の中
で振幅の絶対値の最大値と、ｉ番目の帯域に含まれる標
本の振幅の絶対値の平均値との比とする帯域分割符号化
のビット割当方法。9. A method for dividing a digital signal into N frequency bands, converting the N band signals into low frequency band signals, and converting each of the low frequency band signals into low frequency band signals. Sampling, and quantizing each of the sampled signals, wherein the total number of bits allocated to the coding of each of the low frequency band signals is B bits, and i of each of the low frequency bands is the number of bits b i to be allocated to th band signal In band division coding in which the index X i is the average value of the absolute values of the amplitudes of the samples included in the i-th band, the indices obtained for the i-th band are X i and Y i , When a predetermined threshold value is set to TH and a predetermined weight is set to W, when the condition of Y i ≧ TH is satisfied, the index X i is replaced with X i × (1 + W), and the index is set to the i-th band. Number of allocated bits b i
And the index Y i is a ratio of the maximum value of the absolute value of the amplitude among the samples included in the i-th band to the average value of the absolute values of the amplitudes of the samples included in the i-th band. Bit allocation method for division coding.
中で振幅の絶対値の最大値と、ｉ番目の帯域に含まれる
標本の振幅の二乗の平均値との比とする請求項（９）記
載の帯域分割符号化のビット割当方法。10. The method according to claim 10, wherein the index Y i is a ratio between the maximum value of the absolute value of the amplitude of the samples included in the i-th band and the average value of the square of the amplitude of the samples included in the i-th band. Item (9): A bit allocation method for band division encoding.
中で振幅の二乗の最大値と、ｉ番目の帯域に含まれる標
本の振幅の絶対値の平均値との比とする請求項（９）記
載の帯域分割符号化のビット割当方法。11. A claim that a ratio of the maximum value of the square of the amplitude in the sample contained an index Y i to i-th band, the average value of the absolute value of the amplitude of the sample contained in the i-th band Item (9): A bit allocation method for band division encoding.
中で振幅の二乗の最大値と、ｉ番目の帯域に含まれる標
本の振幅の二乗の平均値との比とする請求項（９）記載
の帯域分割符号化のビット割当方法。12. The index Y i is a ratio of the maximum value of the square of the amplitude of the samples included in the i-th band to the average value of the square of the amplitude of the samples included in the i-th band. (9) The bit allocation method of band division coding according to (9).
割するステップと、分割した前記Ｎ個の帯域信号をそれ
ぞれ低域周波数帯域信号に低域変換するステップと、前
記各低域周波数帯域信号を標本化するステップと、前記
各標本化信号を量子化するステップとを含んでなり、前
記各低域周波数帯域信号の符号化に割り当てるビット数
の総和をＢビットとし前記各低域周波数帯域のｉ番目の
帯域信号に割り当てるビット数biを と定め、指標Xiをｉ番目の帯域に含まれる標本の振幅の
二乗の平均値とする帯域分割符号化において、ｉ番目の
帯域に対して求められた指標をXi及びYiとし、あらかじ
め定めたしきい値をTH、及びあらかじめ定めた重みをＷ
とおき、 Yi≧TH の条件が満足されるとき、指標Xiを Xi×（１＋Ｗ） で置き換え、前記ｉ番目の帯域に割り当てるビット数bi
を定め、前記指標Yiをｉ番目の帯域に含まれる標本の中
で振幅の絶対値の最大値と、ｉ番目の帯域に含まれる標
本の振幅の絶対値の平均値との比とする帯域分割符号化
のビット割当方法。13. A method for dividing a digital signal into N frequency bands, converting each of the divided N band signals into a low frequency band signal, and converting each of the low frequency band signals. Sampling, and quantizing each of the sampled signals, wherein the total number of bits allocated to the coding of each of the low frequency band signals is B bits, and i of each of the low frequency bands is the number of bits b i to be allocated to th band signal In band division coding in which the index X i is the average value of the square of the amplitude of the sample included in the i-th band, the indices obtained for the i-th band are X i and Y i, and The predetermined threshold is TH, and the predetermined weight is W
When the condition of Y i ≧ TH is satisfied, the index X i is replaced by X i × (1 + W), and the number of bits b i to be allocated to the i-th band is set.
And the index Y i is a ratio of the maximum value of the absolute value of the amplitude among the samples included in the i-th band to the average value of the absolute values of the amplitudes of the samples included in the i-th band. Bit allocation method for division coding.
中で振幅の絶対値の最大値と、ｉ番目の帯域に含まれる
標本の振幅の二乗の平均値との比とする請求項（13）記
載の帯域分割符号化のビット割当方法。14. The method according to claim 14, wherein the index Y i is a ratio between the maximum value of the absolute value of the amplitude of the samples included in the i-th band and the average value of the square of the amplitude of the samples included in the i-th band. Item (13), a bit allocation method for band division coding.
中で振幅の二乗の最大値と、ｉ番目の帯域に含まれる標
本の振幅の絶対値の平均値との比とする請求項（13）記
載の帯域分割符号化のビット割当方法。15. claimed that the ratio of the maximum value of the square of the amplitude in the sample contained an index Y i to i-th band, the average value of the absolute value of the amplitude of the sample contained in the i-th band Item (13), a bit allocation method for band division coding.
中で振幅の二乗の最大値と、ｉ番目の帯域に含まれる標
本の振幅の二乗の平均値との比とする請求項（13）記載
の帯域分割符号化のビット割当方法。16. A claim that a ratio of the maximum value of the square of the amplitude in the sample contained an index Y i to i-th band, the mean value of the square of the amplitude of the sample contained in the i-th band (13) The bit allocation method of band division coding according to (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2333944A JP2833212B2 (en) | 1990-11-29 | 1990-11-29 | Bit allocation method for band division coding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2333944A JP2833212B2 (en) | 1990-11-29 | 1990-11-29 | Bit allocation method for band division coding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04199200A JPH04199200A (en) | 1992-07-20 |
| JP2833212B2 true JP2833212B2 (en) | 1998-12-09 |
Family
ID=18271722
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2333944A Expired - Fee Related JP2833212B2 (en) | 1990-11-29 | 1990-11-29 | Bit allocation method for band division coding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2833212B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2575265B2 (en) * | 1992-07-03 | 1997-01-22 | 松下電器産業株式会社 | Digital audio signal encoding method |
| WO1995032499A1 (en) * | 1994-05-25 | 1995-11-30 | Sony Corporation | Encoding method, decoding method, encoding-decoding method, encoder, decoder, and encoder-decoder |
| DK1238569T3 (en) | 1999-12-15 | 2003-11-03 | Phonak Ag | Method of generating a predetermined or predetermined reception characteristic of a digital hearing aid as well as a digital hearing aid |
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|---|---|---|---|---|
| JPS5921039B2 (en) * | 1981-11-04 | 1984-05-17 | 日本電信電話株式会社 | Adaptive predictive coding method |
| JPS58193598A (en) * | 1982-05-07 | 1983-11-11 | 日本電気株式会社 | Voice coding system and apparatus provided therefor |
| JPS60200298A (en) * | 1984-03-24 | 1985-10-09 | 株式会社東芝 | Adaptive type encoder |
| US4899384A (en) * | 1986-08-25 | 1990-02-06 | Ibm Corporation | Table controlled dynamic bit allocation in a variable rate sub-band speech coder |
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1990
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| Publication number | Publication date |
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| JPH04199200A (en) | 1992-07-20 |
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