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High band component restoring device

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JPH0685607A
JPH0685607A JP23120592A JP23120592A JPH0685607A JP H0685607 A JPH0685607 A JP H0685607A JP 23120592 A JP23120592 A JP 23120592A JP 23120592 A JP23120592 A JP 23120592A JP H0685607 A JPH0685607 A JP H0685607A
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component
original
band
signal
audio
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Japanese (ja)
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Hachiro Yokota
八郎 横田
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Alpine Electron Inc
アルパイン株式会社
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Abstract

PURPOSE:To restore the high band component omitted from an original audio signal. CONSTITUTION:The frequency of an original audio signal is analyzed by a frequency analyzing part 16. Then a tone color component including a pair of a fundamental tone and a harmonic is extracted out of the original audio signal band by an extracting part 18 based on the analyzing result of the part 16. Then an extrapolation means 30 estimates the harmonic component of a high band from the original audio signal band and extrapolates the harmonic component into the original audio signal with use of the tone color component extracted by the part 18.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は高域成分復元装置に係り、特に原オーディオ信号が帯域制限されているために欠落した成分を復元することで音質向上を図った高域成分復元装置に関する。 The present invention relates relates to a high-frequency component restoring device, a high frequency component restoring apparatus which attained the sound quality improved by restoring the missing component to particularly original audio signal is band-limited.

【0002】 [0002]

【従来の技術】コンパクトディスク、DAT等のディジタルオーディオでは、サンプリング周波数fsに対し、 BACKGROUND OF THE INVENTION Compact discs, the digital audio DAT, etc., with respect to the sampling frequency fs,
fs/2以上の原オーディオ信号成分が存在すると所謂折り返し雑音が生じるので、原オーディオ信号は帯域がfs/2以下に制限されてディジタル記録されている。 Since fs / 2 or more so-called aliasing noise when original audio signal component is likely to occur, the original audio signal band is digitally recorded is limited to fs / 2 or less.
コンパクトディスクではfs=44.1kHz の1種類、DA 1 kind of fs = 44.1kHz is a compact disk, DA
Tではfs=48kHz ,44kHz 等の複数種類となっているが、いずれにしても、ディジタルオーディオ信号をサンプリング周波数fsのままD/AコンバータでD/A変換すると、D/Aコンバータ出力がパルス幅を持つことから、f特の高域レスポンスが低下したり(アパーチャ効果)、また、サンプリング周波数fsが低いことで量子化雑音が目立ったりする。 T In fs = 48kHz, but has a plurality of types of such 44 kHz, in any event, the digital audio signal while the D / A converter of the sampling frequency fs by converting D / A, D / A converter output pulse width because of its high range response may decrease the f-characteristic (aperture effect), also or noticeable quantization noise by the sampling frequency fs is lower. このため、通常は、ディジタルオーディオ信号をD/A変換する前に、ディジタルフィルタを通してサンプリング周波数を、4倍、8倍等のn倍に上げるオーバーサンプリングを行い、nfsのサンプリング周波数でD/A変換し、高域レスポンスの低下を回避したり、量子化雑音を低減したりする処理がなされている。 Therefore, usually, a digital audio signal before converting D / A, the sampling frequency through a digital filter, 4 times, performs oversampling to increase to n times of 8-fold, etc., D / A conversion at a sampling frequency of nfs and, or to avoid degradation of the high response, the processing or to reduce the quantization noise have been made.

【0003】 [0003]

【発明が解決しようとする課題】ところで、オーディオ信号は、単一周波数の純音成分だけから成る場合は少なく、通常は基音と倍音の組み合わせから成る音色成分が1又は複数含まれている。 Meanwhile [0008], the audio signal is less when made of only pure tone component of a single frequency, usually tonal components comprising a combination of fundamental and harmonics are included one or a plurality. しかしながら、図4に示す如く、原ディジタルオーディオ信号の帯域がfs/2以下に制限されていることにより、基音f 1と倍音f 2 〜f However, as shown in FIG. 4, by the band of the original digital audio signal is limited to fs / 2 or less, the fundamental tone f 1 and harmonic f 2 ~f
4の組み合わせから成る音色成分では、fs/2以上の倍音f 3 ,f 4の成分が欠落しており、ディジタルフィルタでn倍オーバーサンプリングしたからといって、欠落した倍音成分は復元しない。 The tonal components comprising a combination of 4, fs / 2 or more harmonic f 3, components f 4 are missing, just because the n-times oversampling digital filter, missing harmonics is not restored. よって、基音と倍音の組み合わせから成る音色成分については、生の音楽を忠実に再現した再生ができないという問題があった。 Therefore, for the tonal components comprising a combination of fundamental and harmonic, there is a problem that can not be reproduced faithfully reproduce the live music. 以上から、本発明の目的は、原オーディオ信号で欠落している高域成分を復元できるようにした高域成分復元装置を提供することである。 From the above, an object of the present invention is to provide a high-frequency component restoration apparatus which can recover the high-frequency component that is missing in the original audio signal.

【0004】 [0004]

【課題を解決するための手段】上記課題は本発明においては、原オーディオ信号に対し周波数分析を行う周波数分析手段と、周波数分析手段での分析結果から原オーディオ信号帯域中に基音と倍音が組で存在する音色成分を抽出する抽出手段と、抽出手段で抽出された音色成分を用いて、原オーディオ信号帯域より高域側の倍音成分を予測し原オーディオ信号に外挿する外挿手段を備えたことにより達成される。 In the above problems BRIEF SUMMARY OF THE INVENTION The present invention, a frequency analysis means for performing a frequency analysis with respect to the original audio signal, the fundamental tone and overtones from the analysis result of the frequency analysis unit in the original audio signal band is set extracting means for extracting the tonal components in the present, with the sound component extracted by the extraction means comprises a extrapolating extrapolation means to the original audio signal to predict the harmonic components in the high frequency side than the original audio signal band It is achieved by the.

【0005】 [0005]

【作用】本発明によれば、原オーディオ信号に対し周波数分析を行い、分析結果から原オーディオ信号帯域中に基音と倍音が組で存在する音色成分を抽出し、抽出した音色成分を用いて、原オーディオ信号帯域より高域側の倍音成分を予測し原オーディオ信号に外挿する。 According to the present invention, the original audio signal to perform a frequency analysis, fundamental and harmonics from the analysis result in the original audio signal band is extracted tonal component present in the set, using the extracted tonal components, extrapolated to the original audio signal to predict the harmonic components in the high frequency side than the original audio signal band. これにより、原オーディオ信号で欠落した倍音成分を復元し、 Thus, to restore the missing harmonics in the original audio signal,
生の音楽を忠実に再現した再生が可能となる。 It can be reproduced faithfully reproduce the live music.

【0006】 [0006]

【実施例】図1は本発明の実施例構成図である。 DETAILED DESCRIPTION FIG. 1 is an embodiment diagram of the present invention. 図中、 In the figure,
10は音楽信号がディジタル記録されたコンパクトディスク、12はコンパクトディスクの記録信号を読み取り、16ビット長でサンプリング周波数fs(=44.1kH 10 compact disc music signal is digitally recorded, 12 reads the recording signals of a compact disc, a 16-bit length sampling frequency fs (= 44.1kH
z )のディジタルオーディオ信号(原オーディオ信号) Digital audio signals z) (original audio signal)
DS 0を出力するディク読み取り部である。 A decrease-reading unit for outputting DS 0. ディジタルオーディオ信号DS 0は折り返し歪みの発生を防ぐため帯域がfs/2以下に制限されている。 Digital audio signal DS 0 is the bandwidth to prevent the occurrence of aliasing distortion is limited to fs / 2 or less. 14はディスク読み取り部から出力された原ディジタルオーディオ信号に対し、n倍のオーバーサンプリングを行い高域レスポンスの改善を行うディジタルフィルタである。 14 to the original digital audio signal outputted from the disk reading section is a digital filter for improving the high frequency response is performed n times oversampling. ディジタルフィルタは、16ビット長の高精度でディジタルオーディオ信号DS 1を出力する。 Digital filter outputs a digital audio signal DS 1 in 16-bit precision.

【0007】16はディジタルオーディオ信号DS 0に対し周波数分析を行う周波数分析部であり、該周波数分析部はFFT処理でディジタルオーディオ信号DS 0に対し時間軸−周波数軸変換を行ってリアルタイムに周波数分析を行う。 [0007] 16 is a frequency analyzer which performs frequency analysis with respect to the digital audio signal DS 0, the frequency analysis unit is the time axis with respect to digital audio signal DS 0 in FFT processing - frequency analysis in real time by performing a frequency axis conversion I do. 18は周波数分析部16での分析結果より、ディジタルオーディオ信号帯域内(fs/2以下) 18 from the analysis result of the frequency analysis unit 16, a digital audio signal band (fs / 2 or less)
に、基音と倍音の組み合わせから成る音色成分を抽出する抽出部、20は抽出部で抽出された音色成分から所定の予測関数を用いて、該音色成分が本来fs/2〜nf , The extractor for extracting tonal components comprising a combination of fundamental and harmonic, 20 using a predetermined prediction function from tonal components extracted by the extraction unit, originally timbre component fs / 2~nf
s/2の帯域で有しているべき倍音を予測し、該予測した倍音をnfsのサンプリング周波数による14ビット長のディジタルオーディオ信号DS 2 (時間軸上データ)として出力する予測部である。 It predicted harmonics should have a band of s / 2, a prediction unit for outputting a harmonic that the predicted as a digital audio signal DS 2 of 14-bit length by the sampling frequency of nfs (time axis data).

【0008】予測部20は、抽出部18で抽出された各音色成分につき、基音と倍音の周波数関係及びレベル関係から、予測関数を用いて、fs/2〜nfs/2の帯域に存在すべき倍音の周波数とレベルを予測計算する。 [0008] Prediction unit 20 may, for each tonal component extracted by the extraction unit 18, the frequency relationship and level relationship fundamental tone and overtones, using a prediction function, should be present in the band of fs / 2~nfs / 2 predicting calculate the frequency and level of the overtones.
予測関数は、例えば、抽出部18で抽出された或る1つの音色成分が図2(1)に示す如く、f 1の基音、f 2 Prediction function, for example, one certain tonal components extracted by the extraction unit 18 as shown in FIG. 2 (1), the f 1 fundamental, f 2
〜f 4の倍音となっていたとき、fs/2に近い方の2 When it becomes a harmonic of ~f 4, 2 closer to fs / 2
つの倍音f 3 ,f 4のレベルを結んだ直線を予測関数F One of harmonics f 3, connecting the level of f 4 linear prediction function F
とし、 f i =f 4 +(i−4)・(f 4 −f 3 ) 但し、i=5、6、7、・・・・、 fs/2<f i <nfs/2 となる各f 5 、f 6 、・・・を予測倍音の周波数、 And then, f i = f 4 + ( i-4) · (f 4 -f 3) where, i = 5,6,7, ····, fs / 2 <f i <nfs / 2 to become the f 5, f 6, the frequency of the predicted harmonic the ...,
5 、f 6 、・・・での直線F上のレベルを予測倍音のレベルとする。 f 5, f 6, the level on the line F in ... the level of the predicted harmonics. そして、予測部20は各予測倍音につき、時間軸上での合成波形に係るディジタルオーディオ信号を出力する。 Then, the prediction unit 20 for each prediction harmonic, and outputs a digital audio signal according to the synthesized waveform on the time axis. 抽出部18で抽出した音色成分が複数個存在するときは、各音色成分毎に、倍音の予測を行い、全て合成した波形に係るディジタルオーディオ信号を出力する。 When tonal components extracted by the extraction unit 18 is plurally present, for each tonal components, making predictions of harmonic, and outputs a digital audio signal according to all the synthesized waveform.

【0009】なお、或る1つの音色成分について、Fの傾きが例えば、−6dB/octより小さいとき、fs/2〜 [0009] Note that one tonal components one, when the inclination of F, for example, less than -6dB / oct, fs / 2~
nfs/2の範囲の倍音は存在しないとしてもよい。 Overtone in the range of nfs / 2 may as not exist. また、図2(2)に示す如く、抽出部18で抽出された或る1つの音色成分がf 1の基音、f 2の倍音となっていたとき、基音f 1と倍音f 2のレベルを結んだ直線を予測関数Fとし、 f i =f 2 +(i−2)・(f 2 −f 1 ) 但し、i=3、4、5、・・・・、 fs/2<f i <nfs/2 となる各f 3 、f 4 、・・・を予測倍音の周波数、 Further, as shown in FIG. 2 (2), the extraction unit 18 with the extracted one certain tonal components is f 1 fundamental, when it the harmonics f 2, the level of the fundamental tone f 1 and harmonic f 2 a straight line that connects the prediction function F, f i = f 2 + (i-2) · (f 2 -f 1) However, i = 3,4,5, ····, fs / 2 <f i < nfs / 2 to become each f 3, f 4, the frequency of the predicted harmonic the ...,
3 、f 4 、・・・での直線F上のレベルを予測倍音のレベルとする。 f 3, f 4, the level on the line F in ... the level of the predicted harmonics.

【0010】22はディジタルフィルタから出力されたディジタルオーディオ信号DS 1をD/A変換する16 [0010] 22 The digital audio signal DS 1 outputted from the digital filter to convert D / A 16
ビット長のD/Aコンバータであり、ディジタルオーディオ信号DS 1がn倍オーバーサンプリングされていることから、fs/2付近の高域レスポンスが改善され、 A D / A converter bit length, since the digital audio signal DS 1 is n-times oversampling, improves high-frequency response near fs / 2,
量子化雑音の少ないfs/2以下のアナログオーディオ信号AS 1を出力する。 And it outputs the analog audio signal AS 1 less fs / 2 or less quantization noise. 24は予測部20から出力されたディジタルオーディオ信号DS 2をD/A変換する1 24 a digital audio signal DS 2 outputted from the prediction unit 20 converts D / A 1
4ビット長のD/Aコンバータであり、fs/2〜nf 4 is a D / A converter bit length, fs / 2~nf
sの帯域に入る倍音のアナログオーディオ信号AS 2を出力する。 and it outputs the analog audio signal AS 2 harmonics entering the bandwidth of s. 26は加算器であり、アナログオーディオ信号AS 1とAS 2を加算して、アナログオーディオ信号AS 3として出力する。 26 denote adders adds the analog audio signal AS 1 and AS 2, and outputs as an analog audio signal AS 3. 28はカットオフ周波数f cがnfs/2のLPFであり、アナログオーディオ信号A 28 is a cut-off frequency f c is nfs / 2 LPF, an analog audio signal A
3に含まれるnfs/2以上の折り返し歪み成分をカットする。 Cutting the nfs / 2 or more aliasing distortion component contained in the S 3. 予測部20、D/Aコンバータ22と24、 Prediction unit 20, D / A converter 22 and 24,
加算器26により、高域倍音成分外挿手段30が構成されている。 By the adder 26, high-frequency harmonics extrapolation means 30 is constituted. なお、周波数分析部16、抽出部18、予測部20はマイクロコンピュータやDSP(ディジタルシグナルプロセッサ)を用いて実現することができる。 The frequency analysis unit 16, the extraction unit 18, prediction unit 20 may be implemented using a microcomputer or a DSP (digital signal processor).

【0011】次に上記した実施例の動作を、n=4とした場合について簡単に説明する。 [0011] The next operation of the embodiment described above will be briefly described the case where was n = 4. ディスク読み取り部1 Disk reading section 1
2でコンパクトディスク10から読み取られたディジタルオーディオ信号DS 0は、サンプリング周波数fs= Digital audio signal DS 0 read from compact disk 10 by 2, the sampling frequency fs =
44.1kHz で、帯域がfs/2以下に制限されている。 In 44.1 kHz, the bandwidth is limited to fs / 2 or less. ディジタルオーディオ信号DS 0はディジタルフィルタ1 Digital audio signal DS 0 digital filter 1
4で4倍のオーバーサンプリングがなされ、サンプリング周波数4fsのディジタルオーディオ信号DS 1に変換されたのち、D/Aコンバータ22でD/A変換されてアナログオーディオ信号AS 1として出力される。 4 4-times oversampling is performed by, after being converted to a digital audio signal DS 1 of the sampling frequency 4fs, is outputted as an analog audio signal AS 1 is D / A converted by the D / A converter 22. このアナログオーディオ信号AS 1は、fs/2以下の原オーディオ信号につき、ディジタルフィルタ14のオーバーサンプリングにより、アパーチャ効果によるfs/ The analog audio signal AS 1 is per fs / 2 or less of the original audio signal, by oversampling the digital filter 14, fs by the aperture effect /
2近くのレスポンス低下の回避と量子化雑音の低減が図られたものとなる。 Becomes two reduction of avoidance and quantization noise near the response drop is achieved.

【0012】一方、ディジタルーオーディオ信号DS 0 [0012] On the other hand, digital-to-audio signal DS 0
は、周波数分析部16で周波数分析されたのち、抽出部18でfs/2以下の帯域に存在する基音と1又は複数の倍音の組み合わせからなる1又は複数の音色成分が抽出される。 , After being frequency analysis by the frequency analysis unit 16, fundamental tone and one or more tonal components comprising a combination of one or more harmonics present in fs / 2 or less of band extracting section 18 is extracted. そして、抽出部18で抽出した各音色成分毎に、予測部20でfs/2〜2fsの帯域に存在すべき倍音が予測され、予測した倍音全てが合成された時間軸上でのディジタルオーディオ信号DS 2がサンプリング周波数4fsで出力される。 Then, the extraction unit 18 for each of tonal components extracted in, is predicted harmonics to be present in the band at the predicting unit 20 fs / 2~2fs, digital audio signal on the time that all harmonics that prediction is synthesized axis DS 2 is output at the sampling frequency 4fs. ディジタルオーディオ信号DS 2はD/Aコンバータ24でD/A変換されてアナログオーディオ信号AS 2として出力され、加算器26 Digital audio signal DS 2 is output as an analog audio signal AS 2 is D / A converted by the D / A converter 24, an adder 26
で帯域fs/2以下のアナログオーディオ信号AS 1と合成されてアナログオーディオ信号AS 3として出力される。 In is combined with an analog audio signal AS 1 band fs / 2 or less is outputted as an analog audio signal AS 3. よって、アナログオーディオ信号AS 3は、図3 Therefore, the analog audio signal AS 3 is 3
に示す如く、fs/2以下の帯域にアパーチャ効果が改善され、かつ、量子化歪みが軽減された原オーディオ信号成分(SA 1 )を含み、fs/2〜2fsの帯域に、 As shown in, it improves fs / 2 band below the aperture effect and includes original audio signal component the quantization distortion is alleviated (SA 1), in the band of fs / 2~2fs,
本来、存在すべき倍音成分が外挿された信号成分(SA Essentially, the signal component harmonic components should be present extrapolated (SA
2 )を含むものとなる。 It becomes, including 2). アナログオーディオ信号AS 3 Analog audio signal AS 3
はLPF28で2fs以上の折り返し歪み成分が除去された後、外部出力される。 After 2fs more aliasing distortion component is removed by the LPF 28, it is externally outputted.

【0013】この実施例によれば、原オーディオ信号ではカットされていた高域の倍音成分を復元して、生の音楽に忠実な音楽再生が可能となる。 According to this embodiment, the original audio signal by restoring the harmonics of the high frequency which have been cut, it is possible to faithful music playback live music. そして、原オーディオ信号に純音(単一周波数のサイン波)として含まれている音色成分については、倍音の外挿はなされないので、原オーディオ帯域でのTHDが悪化したり、再生音に歪みが生じたりすることはない。 And, for the tonal components contained as a pure tone in the original audio signal (sine wave of a single frequency), no extrapolation overtones made, or THD is deteriorated in the original audio bandwidth, distortion in reproduced sound there is no possibility that or cause.

【0014】なお、上記した実施例では、アナログ領域でfs/2以下の原オーディオ信号に対しfs/2〜n [0014] In the embodiment described above, in the analog domain fs / 2 or less of the original audio signal to fs / 2- through n
fsの予測倍音を外挿するようにしたが、ディジタル領域で行うようにしてもよい。 Predicted harmonics of fs was to extrapolate, it may be performed in the digital domain. また、fsは44.1kHz に限られず、これ以上又はこれ以下であってもよく、更に、 Further, fs is not limited to 44.1 kHz, it may also be more or less than this, and further,
nも2、8、16等であってもよい。 n may also be a 2,8,16, and the like. 以上、本発明を実施例、変形例等により説明したが、本発明は請求の範囲に記載した本発明の主旨に従い種々の変形が可能であり、本発明はこれらを排除するものではない。 Although the present invention embodiments have been described by modification or the like, the present invention is capable of various modifications in accordance with the gist of the present invention described in the claims, the present invention does not exclude them.

【0015】 [0015]

【発明の効果】以上本発明によれば、原オーディオ信号に対し周波数分析を行う周波数分析手段と、周波数分析手段での分析結果から原オーディオ信号帯域中に基音と倍音が組で存在する音色成分を抽出する抽出手段と、抽出手段で抽出された音色成分を用いて、原オーディオ信号帯域より高域側の倍音成分を原オーディオ信号に外挿する外挿手段を備え、原オーディオ信号に対し周波数分析を行い、分析結果から原オーディオ信号帯域中に基音と倍音が組で存在する音色成分を抽出し、抽出した音色成分を用いて、原オーディオ信号帯域より高域側の倍音成分を予測し原オーディオ信号に外挿するように構成したから、原オーディオ信号で欠落した倍音成分を復元し、生の音楽を忠実に再現した再生が可能となる。 According to the present invention as described above, tonal components and frequency analysis means for performing a frequency analysis with respect to the original audio signal, the fundamental tone and overtones from the analysis result of the frequency analysis unit in the original audio signal band is present in the set extraction means for extracting, using the tonal components extracted by the extracting means comprises extrapolating extrapolation means harmonics of the high band side of the original audio signal band to the original audio signal, the frequency with respect to the original audio signal analyzes, the fundamental tone and overtones from the analysis results in the original audio signal band is extracted tonal component present in the set, using the extracted tonal components to predict the harmonic components in the high frequency side than the original audio signal band Hara because you configured extrapolate the audio signal, to restore the missing harmonics in the original audio signal, it is possible to faithfully reproduce reproduction raw music.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の実施例構成図である。 1 is an example block diagram of the present invention.

【図2】図1中の予測部の動作を示す線図である。 2 is a diagram showing the operation of the prediction unit in FIG.

【図3】加算器出力のスペクトラムを示す線図である。 3 is a diagram showing the spectrum of the adder output.

【図4】原オーディオ信号と倍音の関係を示す線図である。 4 is a diagram showing a relationship between an original audio signal and harmonics.

【符号の説明】 DESCRIPTION OF SYMBOLS

16 周波数分析部 18 抽出部 20 予測部 30 外挿手段 16 frequency analyzer 18 extraction unit 20 prediction unit 30 extrapolating means

Claims (1)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 原オーディオ信号に対し周波数分析を行う周波数分析手段と、 周波数分析手段での分析結果から原オーディオ信号帯域中に基音と倍音が組で存在する音色成分を抽出する抽出手段と、 抽出手段で抽出された音色成分を用いて、原オーディオ信号帯域より高域側の倍音成分を予測し原オーディオ信号に外挿する外挿手段と、 を備えたことを特徴とする高域成分復元装置。 And 1. A original audio signal frequency analyzing means for performing a frequency analysis to an extraction means for fundamental and harmonics from the analysis result in the original audio signal band at the frequency analysis means for extracting tonal components present in pairs, using the tonal components extracted by the extraction means, the high frequency component characterized by comprising extrapolating extrapolation means, to the original audio signal is predicted harmonics than the original audio signal band high band side restores apparatus.
JP23120592A 1992-08-31 1992-08-31 High band component restoring device Withdrawn JPH0685607A (en)

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