JPH0266598A - Speech signal compressing and expanding device - Google Patents
Speech signal compressing and expanding deviceInfo
- Publication number
- JPH0266598A JPH0266598A JP63219073A JP21907388A JPH0266598A JP H0266598 A JPH0266598 A JP H0266598A JP 63219073 A JP63219073 A JP 63219073A JP 21907388 A JP21907388 A JP 21907388A JP H0266598 A JPH0266598 A JP H0266598A
- Authority
- JP
- Japan
- Prior art keywords
- waveform
- representative
- audio signal
- waveforms
- repetitive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003252 repetitive effect Effects 0.000 claims abstract description 18
- 230000005236 sound signal Effects 0.000 claims description 28
- 230000006835 compression Effects 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 16
- 230000002542 deteriorative effect Effects 0.000 abstract description 6
- 230000001172 regenerating effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000284 extract Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- OWNRRUFOJXFKCU-UHFFFAOYSA-N Bromadiolone Chemical compound C=1C=C(C=2C=CC(Br)=CC=2)C=CC=1C(O)CC(C=1C(OC2=CC=CC=C2C=1O)=O)C1=CC=CC=C1 OWNRRUFOJXFKCU-UHFFFAOYSA-N 0.000 description 1
- 238000012952 Resampling Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005311 autocorrelation function Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、音声信号圧縮伸張装置に関する。[Detailed description of the invention] Industrial applications The present invention relates to an audio signal compression/expansion device.
従来の技術
第7図は、従来の音声信号圧縮伸張装置の動作を説明す
るための波形図である。BACKGROUND OF THE INVENTION FIG. 7 is a waveform diagram for explaining the operation of a conventional audio signal compression/expansion device.
第7図(a)に示すように、音声信号の定常部では通常
、類似した波形が繰り返されているので、第7図(b)
に示すようにこの繰り返し波形から代表波形を切り出し
、他の類似する波形を間引くことにより音声信号を圧縮
する。As shown in Fig. 7(a), similar waveforms are usually repeated in the stationary part of the audio signal, so Fig. 7(b)
As shown in the figure, a representative waveform is cut out from this repetitive waveform and other similar waveforms are thinned out to compress the audio signal.
そして、第7図(c)に示すように、間引かれた波形を
切り出された波形により繰り返して補間することにより
伸張する。Then, as shown in FIG. 7(c), the thinned out waveform is expanded by repeatedly interpolating the cut out waveform.
したがって、上記従来例では、音声信号の定常部の類似
した波形を間引くことにより圧縮し、間引かれた波形を
代表波形により繰り返して補間して伸張するように構成
されている。Therefore, in the conventional example described above, similar waveforms in the stationary portion of the audio signal are compressed by thinning out, and the thinned out waveforms are repeatedly interpolated and expanded using representative waveforms.
発明が解決しようとする課題
しかしながら、上記従来の音声信号圧縮伸張装置では、
間引かれた波形を代表波形で単に繰り返して補間するこ
とにより伸張するので、伸張された繰り返し波形の接続
点において、振幅、ピンチ周期(繰り返し波形の周期)
等に起因する不連続部が発生し、したがって、再生され
た音に異音が発生するという問題点がある。Problems to be Solved by the Invention However, in the above-mentioned conventional audio signal compression/expansion device,
The thinned out waveform is expanded by simply repeating interpolation with the representative waveform, so at the connection point of the expanded repetitive waveform, the amplitude, pinch period (period of the repetitive waveform)
There is a problem in that discontinuities occur due to etc., and therefore abnormal noises occur in the reproduced sound.
この結果、再生された音質の劣化を防止するために、圧
縮率を高めることができないという問題点がある。As a result, there is a problem in that the compression ratio cannot be increased in order to prevent deterioration of the reproduced sound quality.
本発明は上記従来の問題点に鑑み、再生された音質が劣
化することなく圧縮率を高めることができる音声信号圧
縮伸張装置を提供することを目的とする。SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide an audio signal compression/expansion device that can increase the compression rate without deteriorating the reproduced sound quality.
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、音声信号の定常部
の繰り返し波形から代表波形を抽出して他の波形を間引
くとともに、音声信号の繰り返し波形の1周期における
サンプル数を求めることにより音声信号を圧縮し、この
抽出された代表波形の標本値により、間引かれた波形の
補間多項式を求め、この補間多項式とサンプル数により
、間弓かれた波形の標本値を求めて補間することにより
伸張するようにしたものである。Means for Solving the Problems In order to achieve the above object, the present invention extracts a representative waveform from the repetitive waveform of the stationary part of the audio signal, thins out other waveforms, and thins out the samples in one cycle of the repetitive waveform of the audio signal. The audio signal is compressed by calculating the number of samples, the interpolation polynomial of the decimated waveform is obtained from the sample value of the extracted representative waveform, and the sample value of the decimated waveform is calculated using this interpolation polynomial and the number of samples. It is designed to expand by finding and interpolating.
作用
本発明は上記構成により、伸張された繰り返し波形の接
続点が代表波形の振幅、ピッチ周期(繰り返し波形の周
期)等にかかわらず連続するので、再生された音質が劣
化することなく圧縮率を高めることかできる。Effect: With the above configuration, the connection points of the expanded repetitive waveform are continuous regardless of the amplitude, pitch period (period of the repetitive waveform), etc. of the representative waveform, so the compression ratio can be increased without deteriorating the reproduced sound quality. It can be improved.
実施例
以下、図面を参照して本発明の詳細な説明する。第1図
は、本発明に係る音声信号圧縮伸張装置の一実施例を示
すブロック図、第2図は、第1図の音声信号圧縮伸張装
置の動作を説明するためのフローチャート、第3図は、
第1図の有声音圧縮器の動作を説明するための波形図、
第4図は、第1図の有声音伸張器の動作を説明するため
の波形図、第6図、第6図はそれぞれ、第1図の有声音
伸張器の動作説明図である。EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the audio signal compression/expansion apparatus according to the present invention, FIG. 2 is a flowchart for explaining the operation of the audio signal compression/expansion apparatus of FIG. 1, and FIG. ,
A waveform diagram for explaining the operation of the voiced sound compressor shown in FIG.
FIG. 4 is a waveform diagram for explaining the operation of the voiced sound expander of FIG. 1, and FIGS. 6 and 6 are diagrams for explaining the operation of the voiced sound expander of FIG. 1, respectively.
第1図上段は音声信号圧縮装置を示し、1は、音声が入
力するマイクロホン、2は、マイクロホン1からのアナ
ログ音声信号をディジタル音声信号に変換するA/D変
換回路、3は、A/D変換回路2からのディジタル音声
信号の有音部と無音部を判定して有音部を抽出する有音
/無音判定器、4は、有音/無音判定器3により抽出さ
れた有音部の有声音部と無声音部を判定して有声音部を
抽出する有声音/無声音判定器、5は、有声音/無声音
判定器4により抽出された有声音部を後述するように圧
縮する有声音圧縮器、6は、有音/無音判定器3により
判定された無音部と、有声音/無声音判定器4により判
定された無声音部と、有声音圧縮器6により圧縮された
有声音部をそれぞれ符号化する符号化器、7は、符号化
器6からの符号化データを格納するためのメモリである
。The upper part of FIG. 1 shows an audio signal compression device, where 1 is a microphone into which audio is input, 2 is an A/D conversion circuit that converts an analog audio signal from microphone 1 into a digital audio signal, and 3 is an A/D converter. A voice/silence determiner 4 detects the voice/silence portion extracted by the voice/silence determiner 3 by determining whether the digital audio signal is a voice portion or a silent portion from the conversion circuit 2 and extracts the voice portion. A voiced/unvoiced sound determiner 5 determines between voiced and unvoiced sound parts and extracts the voiced sound part, and 5 is a voiced sound compressor that compresses the voiced sound part extracted by the voiced sound/unvoiced sound determiner 4 as described below. 6 encodes the silent part determined by the voiced/silent determiner 3, the unvoiced part determined by the voiced/unvoiced determiner 4, and the voiced part compressed by the voiced compressor 6, respectively. The encoder 7 is a memory for storing encoded data from the encoder 6.
第1図下段は音声信号伸張装置を示し、8は、符号化デ
ータを格納するためのメモリ、9は、メモリ8から読み
出された符号化データを無音部と、無声音部と有声音部
に復号化する復号化器、10は、復号化器9により復号
化された有声音部を後述するように伸張する有声音部伸
張器、11は、復号化器9により復号化された無音部及
び無声音部と、有声音部伸張器10により伸張された有
声音部をアナログ音声信号に変換するD/A変換回路、
12は、D/A変換回路11からの音声信号を音響変換
するスピーカである。The lower part of FIG. 1 shows an audio signal decompression device, 8 is a memory for storing encoded data, and 9 is a memory for storing encoded data, and 9 converts the encoded data read from the memory 8 into a silent part, an unvoiced part, and a voiced part. A decoder 10 decompresses the voiced part decoded by the decoder 9, and a voiced part decompressor 11 decompresses the voiced part decoded by the decoder 9 as will be described later. a D/A conversion circuit that converts the unvoiced sound part and the voiced sound part expanded by the voiced sound part expander 10 into an analog audio signal;
12 is a speaker that converts the audio signal from the D/A conversion circuit 11 into sound.
次に、第2図(a)、第3図を参照して有声音圧縮器5
の動作を説明する。Next, referring to FIGS. 2(a) and 3, the voiced sound compressor 5
Explain the operation.
第2図(a)に示すステップ21において、有声音圧縮
器5は、自己相関関数等の手法により、第3図(a)に
示すような有声音部の各繰り返し波形の1周期内のサン
プル数を求め、続くステップ22において、第3図(b
)に示すような代表波形A、、A1を求め、更にステッ
プ23において、代表波形AO,A、以外の繰り返し波
形を間引く。In step 21 shown in FIG. 2(a), the voiced sound compressor 5 uses a method such as an autocorrelation function to extract samples within one period of each repetitive waveform of the voiced sound part as shown in FIG. 3(a). Figure 3 (b
) are obtained, and in step 23, repetitive waveforms other than the representative waveforms AO, A, are thinned out.
そして、この有声音部の圧縮データとして、代表波形A
O、A I及び間引かれた波形の1周期内のサンプル
数と、代表波形AO,Atの各標本点の振幅がメモリ7
に格納される。Then, as the compressed data of this voiced part, the representative waveform A
The number of samples in one cycle of O, A I and thinned out waveforms, and the amplitude of each sample point of representative waveforms AO, At are stored in the memory 7.
is stored in
次に、第2図(b)、第4図〜第6図を参照して有声音
伸張器10の動作を説明する。Next, the operation of the voiced sound expander 10 will be explained with reference to FIG. 2(b) and FIGS. 4 to 6.
第2図(b)に示すステップ24において、第4図(a
)に示すような代表波形A ON A Iのサンプル数
をそれぞれlo、ltとし、各標本点の振幅をそれぞれ
、
Ao=xo(o)、xo(1)、+++ xo(lo
1)AI ”xl (OL xl (’) r
”’r xl (”I ’ )とすると(第4図(
a)では、標本点x o (0) + x o (’
) *Xo(2)のみ図示)、有声音伸張器10は、各
標本点X(0)〜X・(g、 −1)に対する補間多項
式を定義する。In step 24 shown in FIG. 2(b), FIG. 4(a)
), the number of samples of the representative waveform A ON A I as shown in A ON A
1) AI "xl (OL xl (') r
"'r xl ("I') (Fig. 4 (
In a), the sample point x o (0) + x o ('
) *Only Xo(2) is shown), the voiced sound expander 10 defines an interpolation polynomial for each sample point X(0) to X·(g, −1).
この補間多項式は、例えば第6図に示すように、4つの
点ao1als a2、a3の座標をaO(1,xo)
at(0,xt)
a2(1,x2)
a3(2,x3)
とし、次の条件
(1)連続する4点を通ること、
(2)各点において、前後の区間での1次微分係数が一
致すること。For example, as shown in FIG. 6, this interpolation polynomial has the coordinates of the four points ao1als a2 and a3 as aO(1,xo) at(0,xt) a2(1,x2) a3(2,x3), The following conditions are met: (1) Pass through four consecutive points; (2) At each point, the first-order differential coefficients in the preceding and succeeding sections must match.
により、次式
%式%)
を得、この式を代表波形の連続する4つの区間xI(J
−1)、xl(」)、xl(」+1)、X (J+2)
に頴次適用し、補間多項式を求める。The following formula (% formula %) is obtained, and this formula is expressed as four consecutive sections xI (J
-1), xl(''), xl(''+1), X (J+2)
Find the interpolation polynomial by applying the polynomial to .
続くステップ25において、代表波形A o、 A 1
と、補間される波形の1周期内のサンプル数を一致させ
るために、代表波形A O、A 1間のに番目の波形の
1周期内のサンプル数をlkとして、代表波形Ao、A
Iのサンプル数がlkになるようにリサンプリングを行
う。In the following step 25, representative waveforms A o, A 1
In order to match the number of samples in one cycle of the waveform to be interpolated, let the number of samples in one cycle of the second waveform between representative waveforms A O, A 1 be lk, and the representative waveforms Ao, A
Resampling is performed so that the number of samples of I becomes lk.
すなわち、代表波形Ao、AIの標本点xH(0)〜X
1(l、 −1)の間を(lk−1)等分し、第4図(
b)に示すように、それぞれの振幅AO”” xo’(
0) t xo’(1) l ”’r xO’(1
301)A1’−xl’(0)、 xl’(1)、 ・
・・、 x1’(111)を求める。That is, sample points xH(0) to X of representative waveform Ao and AI
1(l, -1) is equally divided into (lk-1), and as shown in Figure 4 (
As shown in b), the respective amplitudes AO””xo’(
0) t xo'(1) l ”'r xO'(1
301) A1'-xl'(0), xl'(1), ・
..., find x1' (111).
補間される波形の1周期内のj番目の標本点の振幅xl
(Dは、第6図に示すように、代表波形A、 A、のり
サンプルされたj番目の振幅X。’(D。Amplitude xl of the j-th sample point within one period of the interpolated waveform
(D is the representative waveform A, A, and the sampled j-th amplitude X, as shown in FIG. 6.'(D.
但し、j=o、1.・・・、 1lk−10:補間さ
れる波形数
k −12・・・ n
を用いて算出する。However, j=o, 1. ..., 1lk-10: Calculated using the number of interpolated waveforms k -12...n.
したがって、上記実施例によれば、各代表波形Ao、A
lの補間多項式により、間引かれた波形の標本値を再生
することにより、間引かれた波形が滑らかに補間するこ
とができ、したがって、再生された音質が劣化すること
なく圧縮率を高めることができる。Therefore, according to the above embodiment, each representative waveform Ao, A
By reproducing the sample values of the thinned waveform using the interpolation polynomial of l, the thinned waveform can be smoothly interpolated, and therefore the compression ratio can be increased without deteriorating the reproduced sound quality. Can be done.
発明の詳細
な説明したように、本発明は、音声信号の繰り返し波形
の定常部から代表波形を抽出して他の波形を間引くとと
もに、音声信号の繰り返し波形の1周期におけるサンプ
ル数を求めることにより音声信号を圧縮し、この抽出さ
れた代表波形の標本値により、間引かれた波形の補間多
項式を求め、間引かれた波形の標本値を求めて補間する
ことにより伸張するようにしたので、伸張された繰り返
し波形の接続点が代表波形の振幅、ピッチ周期(繰り返
し波形の周期)等にかかわらず連続し、したがって、再
生された音質が劣化することなく圧縮率を高めることが
できる。DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention extracts a representative waveform from a stationary portion of a repetitive waveform of an audio signal, thins out other waveforms, and calculates the number of samples in one cycle of the repetitive waveform of an audio signal. The audio signal is compressed, the interpolation polynomial of the thinned out waveform is found using the extracted sample values of the representative waveform, and the sample values of the thinned out waveform are found and interpolated for expansion. The connection points of the expanded repetitive waveform are continuous regardless of the amplitude, pitch period (period of the repetitive waveform), etc. of the representative waveform, and therefore the compression ratio can be increased without deteriorating the reproduced sound quality.
第1図は、本発明に係る音声信号圧縮伸張装置の一実施
例を示すブロック図、第2図は、第1図の音声信号圧縮
伸張装置の動作を説明するためのフローチャート、第3
図は、第1図の有声音圧縮器の動作を説明するための波
形図、第4図は、第1図の有声音伸張器の動作を説明す
るための波形図、第6図、第6図はそれぞれ、第1図の
有声音伸張器の動作説明図、第7図は、従来の音声信号
圧縮伸張装置の動作を説明するための波形図である。
5・・・有声音圧縮器(代表波形抽出、サンプル数算出
手段)、6・・・符号化器、了、8・・・メモリ、9・
・・有声音伸張器(補間多項式算出、補間手段)。
代理人の氏名 弁理士 粟 野 重 孝 ほか1名if
!3図
(cl)
1四期内V〕プノ園
(b)
第
図
第
図
(0フ
タ
も
第
図
(C)
1同期四ηL71L数
補薗沢腟牧n=り
N 7 図
(Oン
第
図
第
第
図
(Cン
図FIG. 1 is a block diagram showing an embodiment of the audio signal compression/expansion apparatus according to the present invention, FIG. 2 is a flowchart for explaining the operation of the audio signal compression/expansion apparatus of FIG. 1, and FIG.
6 is a waveform diagram for explaining the operation of the voiced sound compressor shown in FIG. 1, FIG. 4 is a waveform diagram for explaining the operation of the voiced sound expander shown in FIG. The figures are a diagram for explaining the operation of the voiced sound expander shown in FIG. 1, and FIG. 7 is a waveform diagram for explaining the operation of the conventional audio signal compression and expansion device. 5... Voiced sound compressor (representative waveform extraction, sample number calculation means), 6... Encoder, completion, 8... Memory, 9...
...Voiced sound expander (interpolation polynomial calculation, interpolation means). Name of agent: Patent attorney Shigetaka Awano and one other person if
! Figure 3 (cl) 14 period V] Puno Garden (b) Figure Figure (0 lid also Figure (C) 1 synchronization 4 ηL71L number supplementary Sonozawa Vaginal Maki n=riN 7 Figure (O figure) Figure C (Figure C)
Claims (1)
て他の波形を間引く手段と、音声信号の繰り返し波形の
1周期におけるサンプル数を求める手段と、前記抽出さ
れた代表波形の標本値により、間引かれた波形の補間多
項式を求める手段と、前記補間多項式とサンプル数によ
り、間引かれた波形の標本値を求め、補間する手段とを
有する音声信号圧縮伸張装置。means for extracting a representative waveform from the repetitive waveform of the stationary portion of the audio signal and thinning out other waveforms; means for determining the number of samples in one period of the repetitive waveform of the audio signal; and a sample value of the extracted representative waveform, An audio signal compression/expansion device comprising: means for determining an interpolation polynomial of a thinned waveform; and means for determining and interpolating sample values of the thinned waveform using the interpolation polynomial and the number of samples.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63219073A JPH0266598A (en) | 1988-09-01 | 1988-09-01 | Speech signal compressing and expanding device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63219073A JPH0266598A (en) | 1988-09-01 | 1988-09-01 | Speech signal compressing and expanding device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0266598A true JPH0266598A (en) | 1990-03-06 |
Family
ID=16729839
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63219073A Pending JPH0266598A (en) | 1988-09-01 | 1988-09-01 | Speech signal compressing and expanding device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0266598A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006078654A (en) * | 2004-09-08 | 2006-03-23 | Embedded System:Kk | Voice authenticating system, method, and program |
US7630883B2 (en) | 2001-08-31 | 2009-12-08 | Kabushiki Kaisha Kenwood | Apparatus and method for creating pitch wave signals and apparatus and method compressing, expanding and synthesizing speech signals using these pitch wave signals |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5898798A (en) * | 1981-12-08 | 1983-06-11 | 松下電器産業株式会社 | Interpolation system for phoneme editting type voice synthesization |
-
1988
- 1988-09-01 JP JP63219073A patent/JPH0266598A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5898798A (en) * | 1981-12-08 | 1983-06-11 | 松下電器産業株式会社 | Interpolation system for phoneme editting type voice synthesization |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7630883B2 (en) | 2001-08-31 | 2009-12-08 | Kabushiki Kaisha Kenwood | Apparatus and method for creating pitch wave signals and apparatus and method compressing, expanding and synthesizing speech signals using these pitch wave signals |
US7647226B2 (en) | 2001-08-31 | 2010-01-12 | Kabushiki Kaisha Kenwood | Apparatus and method for creating pitch wave signals, apparatus and method for compressing, expanding, and synthesizing speech signals using these pitch wave signals and text-to-speech conversion using unit pitch wave signals |
JP2006078654A (en) * | 2004-09-08 | 2006-03-23 | Embedded System:Kk | Voice authenticating system, method, and program |
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