WO2013024508A1 - Audio processing device, playback device, audio processing method, and program - Google Patents
Audio processing device, playback device, audio processing method, and program Download PDFInfo
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- WO2013024508A1 WO2013024508A1 PCT/JP2011/004589 JP2011004589W WO2013024508A1 WO 2013024508 A1 WO2013024508 A1 WO 2013024508A1 JP 2011004589 W JP2011004589 W JP 2011004589W WO 2013024508 A1 WO2013024508 A1 WO 2013024508A1
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- 238000003672 processing method Methods 0.000 title claims abstract description 8
- 230000005236 sound signal Effects 0.000 claims abstract description 39
- 238000000605 extraction Methods 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 239000000284 extract Substances 0.000 claims description 15
- 206010021403 Illusion Diseases 0.000 description 6
- 230000007423 decrease Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
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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
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
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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
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/90—Pitch determination of speech signals
Definitions
- the present invention relates to an audio processing device, a playback device, an audio processing method, and a program that compensate for low-frequency low frequency bands that cannot be reproduced.
- the second overtone for making the fundamental sound feel is in the low frequency band where it cannot be reproduced and may not be reproduced. Therefore, in such a case, higher harmonics have to be selected as harmonics for making the fundamental sound feel.
- An object of the present invention is to provide a sound processing device, a playback device, a sound processing method, and a program capable of appropriately extracting a harmonic signal that can make a fundamental sound feel uncomfortable.
- the speech processing apparatus of the present invention has a cooperative relationship with the fundamental tone among the fundamental tone detection signal and the fundamental tone detection portion that detects the fundamental tone of the low frequency band from the speech signal, the input unit that inputs the speech signal, A Kyowa overtone extraction unit that extracts the Kyowa overtone signal, a harmonic control unit that controls the level of the Kyowa overtone signal according to the level of the fundamental tone, and a cut signal obtained by cutting the low frequency band signal of the input audio signal And a summing unit for summing up the level-controlled Kyowa overtone signals.
- the speech processing method of the present invention has a cooperative relationship with a fundamental tone among an input step of inputting a speech signal, a fundamental tone detecting step of detecting a fundamental tone in a low frequency band from the speech signal, and a harmonic overtone signal of the fundamental tone.
- a summing step for summing the level-controlled Kyowa overtone signals.
- the program of the present invention causes a computer to execute each step in the voice processing method.
- the Kyowa overtone extraction unit extracts a Kyowa overtone signal having a frequency exceeding the low frequency band to be cut.
- the fundamental tone detection unit detects the level of the fundamental tone
- the Kyowa overtone extraction unit varies the Kyowa overtone signal to be extracted according to the level of the fundamental tone.
- the Kyowa harmonic extraction unit extracts a higher harmonic signal when the fundamental level is higher than when the fundamental level is low.
- the Kyowa overtone extraction unit extracts a Kyowa overtone signal from a band band obtained by cutting a predetermined high frequency band from a frequency band exceeding the low band frequency band.
- a playback device includes the above-described sound processing device and a sound output unit that outputs a sound signal processed by the sound processing device to the outside.
- FIG. 1 shows a circuit configuration of a reproducing apparatus 1 according to the present embodiment.
- a playback device 1 includes a sound processing device 2 that performs predetermined processing on an input sound signal, and a speaker 3 (sound output unit) that outputs the sound signal processed by the sound processing device 2 to the outside.
- a sound processing device 2 that performs predetermined processing on an input sound signal
- a speaker 3 sound output unit
- the speaker 3 of the present embodiment will be described with reference to FIG.
- the figure shows the audio signal reproduction capability of the speaker 3.
- the output level of the audio signal decreases in a frequency band of 700 Hz or less. That is, this speaker 3 indicates that the reproduction limit of bass is 700 Hz.
- the frequency band of 700 Hz or less where the output level of the audio signal decreases is referred to as “unreproducible band”.
- the “low frequency band” in the claims refers to this non-reproducible band.
- the sound processing device 2 performs sound processing for compensating for a sound signal in a non-reproducible band using a human auditory illusion in the speaker 3 having a low bass generation capability as described above. That is, the voice treatment device 2 performs voice processing for compensating the fundamental tone by enhancing the harmonic signal having a frequency that is an integer multiple of 2 or more with respect to the speech signal that is the fundamental tone in the non-reproducible band.
- the speech processing apparatus 2 includes an input terminal 11 (input unit), a high-pass filter 12 (HPF), a fundamental tone detection unit 13, a harmonic overtone extraction unit 14 (a Kyowa overtone extraction unit), and a harmonic overtone amplifier. 15 (overtone control unit), overtone adder 16, overtone adder 17 (addition unit), and output terminal 18.
- the input terminal 11 inputs an audio signal to be reproduced.
- the high-pass filter 12 cuts an unreproducible band audio signal from the input audio signal. That is, the high-pass filter 12 cuts an audio signal having a frequency band of 700 Hz or less, which is a non-reproducible band of the speaker 3, and passes only an audio signal having a frequency higher than 700 Hz that can be reproduced by the speaker 3. As a result, an audio signal having a frequency exceeding the reproduction limit is output to the speaker 3 to prevent generation of abnormal noise.
- the fundamental sound detection unit 13 detects one or more fundamental sounds from the speech signals in the unreproducible band among the input speech signals. That is, a fundamental tone that cannot be physically reproduced by the speaker 3 (a fundamental tone cut by the high-pass filter 12) is detected.
- the fundamental tone detected by the fundamental tone detector 13 is a sound that is a target of auditory illusion. Note that the fundamental tone detector 13 detects the frequency and level of the fundamental tone.
- the harmonic overtone extraction unit 14 extracts one or more fundamental harmonic overtone signals detected by the fundamental tone detection unit 13 from the input voice signal.
- the harmonic harmonic is a harmonic that has a harmonic relationship with the fundamental tone among harmonics having a frequency that is an integer multiple of 2 or more with respect to the frequency of the fundamental tone (see FIG. 3).
- the Kyowa overtone signal is an audio signal for generating a Kyowa overtone output from the speaker 3. By reproducing the Kyowa overtone from the speaker 3, the auditory illusion of the fundamental tone is caused, and the low tone of the reproduced audio signal is compensated.
- the harmonic overtone extraction unit 14 extracts a Kyowa overtone signal from an audio signal in a frequency band having a frequency higher than 700 Hz among the input audio signals.
- a Kyowa overtone signal is extracted from a frequency band (frequency band that passes through the high-pass filter 12) that can be physically reproduced by the speaker 3.
- the harmonic overtone extraction unit 14 extracts the Kyowa overtone signal from the lower order, and changes the order of the Kyowa overtone signal according to the level of the fundamental tone to be auditory illusion (both will be described later in detail).
- the harmonic overtone amplifier 15 controls the level of the extracted Kyowa overtone signal according to the level of the detected fundamental tone. Thereby, it is possible to make an auditory illusion of the fundamental tone at a level close to the input audio signal.
- the harmonic overtone adder 16 adds up the Kyowa overtone signals extracted by the overtone extraction unit 14 and level-controlled by the overtone amplifier 15.
- the overtone adder 17 adds the above-described overtone signal added to the audio signal (cut signal) from which the unreproducible band is cut by the high-pass filter 12.
- the output terminal 18 outputs a cut signal to which the summed harmonic signals are added to the speaker 3.
- FIG. 1 shows the cooperative relationship between the fundamental tone and the second to twentieth overtones.
- the second to sixth overtones, the eighth overtone, the tenth overtone, the twelfth overtone, the sixteenth overtone, and the twentieth overtone are consonant overtones that have a consonant relationship with the fundamental tone.
- the seventh overtone, the ninth overtone, the eleventh overtone, the thirteenth through the fifteenth overtone, and the seventeenth through the nineteenth overtone are dissonant overtones that are in a dissonant relationship with the fundamental tone.
- the harmonic overtone is any one of C, E, and G. That is, when the fundamental tone is C, among the harmonics having an integer multiple of 2 or more, the sound constituting the triad obtained by stacking two sounds of about 3 degrees on C is the Kyowa overtone.
- the harmonic overtone extracting unit 14 extracts a harmonic harmonic signal that generates the above harmonic harmonic from the second harmonic to the twentieth harmonic.
- the harmonic signal extracted by the harmonic extraction unit 14 will be described in detail with reference to FIG.
- FIG. This figure shows the frequencies of the second to twentieth harmonics for each fundamental tone of “predetermined level”. Further, the shaded portion in the figure indicates the band of the harmonic signal that is the extraction candidate of the harmonic extraction unit 14. That is, the harmonic overtone extraction unit 14 extracts a harmonic overtone signal from an audio signal in a frequency band of 700 Hz to 2100 Hz. Note that, as described above, the harmonic overtone extraction unit 14 eliminates the dissonance overtone signal that is incoordinating with the fundamental tone from the overtone signals in the frequency band of 700 Hz to 2100 Hz, and has a cooperative relationship with the fundamental tone. Only the Kyowa harmonic signal is extracted.
- the reason why the frequency band from which the harmonic signal is extracted is limited to a frequency band having a frequency higher than 700 Hz is because the frequency band of 700 Hz or less output by the high-pass filter 12 is cut. It is. That is, the harmonic overtone extraction unit 14 extracts the Kyowa overtone signal from the reproducible frequency band audio signal.
- the reason why the frequency band for extracting overtones is limited to 2100 Hz or less is to limit the number of Kyowa overtone signals to be extracted, and to extract from the lowest order in the reproducible frequency band.
- the frequency bands that can be extracted are set so that the maximum number of Kyowa overtone signals to be extracted is five.
- the extracted harmonic harmonic signals are five that generate the sixth harmonic, the eighth harmonic, the tenth harmonic, the twelfth harmonic, and the sixteenth harmonic. If the other sound is a fundamental tone, the number of extracted Kyowa overtone signals is four or less. By limiting the number of consonant harmonic signals to be extracted in this way, it is possible to reduce the amount of calculation processing for extracting consonant harmonics.
- the order of the Kyowa overtone signal to be extracted for each fundamental tone level will be described.
- the speaker 3 of the present embodiment raises the frequency cut by the high-pass filter 12 as the level of the output audio signal increases. Therefore, the extractable Kyowa overtone signal also changes.
- This figure shows a Kyowa overtone signal extracted according to the level of the fundamental tone (where level 1 ⁇ level 2 ⁇ level 3) when the fundamental tone is A3.
- the harmonic overtone extraction unit 14 extracts a harmonic signal of the fourth overtone, the fifth overtone, the sixth overtone, and the eighth overtone, and the predetermined level.
- harmonic signals of the 5th harmonic, 6th harmonic, and 8th harmonic are extracted. If the level is 3, the harmonic signals of the 6th and 8th harmonics are extracted. In addition, level 1 of the same figure has shown the extraction result in FIG. It is preferable that at least two Kyowa harmonic signals are extracted regardless of the level of the fundamental tone.
- the sound processing device 2 detects a fundamental tone in a non-reproducible band (low frequency band) (S01). Then, the frequency of the Kyowa overtone signal to be extracted is calculated according to the detected fundamental frequency and level (S02). Then, a Kyowa overtone signal is extracted from the cut signal obtained by cutting the unreproducible band from the audio signal (S03). In accordance with the level of the detected fundamental tone, the level of the extracted harmonic harmonic signal is controlled (S04), and the level-controlled harmonic harmonic signal is added to the cut signal (S05).
- the playback device 1 when playing back an audio signal using a speaker 3 with a low bass reproduction capability, such as a speaker 3 with a small diameter or a speaker 3 with a small cabinet capacity, the bass that cannot be reproduced is heard. Even if only high-order harmonics can be extracted for the illusion, only the harmonic harmonic signal that is in a cooperative relationship with the bass (fundamental tone) is extracted. It can be extracted appropriately.
- the sound processing device 2 emphasizes the level of the consonant harmonic component (consonant overtone signal) included in the input sound signal and controls the fundamental tone to make an auditory illusion. There is no need to generate overtone components separately. Therefore, it is possible to suppress complication of the apparatus and complicated processing.
- each component of the voice processing device 2 shown in each of the above embodiments is also possible to provide the program stored in a storage medium (not shown).
- a storage medium As the recording medium, a CD-ROM, a flash ROM, a memory card, a compact disk, a magneto-optical disk, or the like can be used.
- the configuration and processing steps of the audio processing device 2 and the playback device 1 can be appropriately changed without departing from the gist of the present invention, regardless of the above-described embodiments.
- Playback device 2 Audio processing device 3: Speaker 11: Input terminal 12: High-pass filter 13: Fundamental tone detection unit 14: Overtone extraction unit 15: Overtone amplifier 17: Overtone adder 18: Output terminal
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Abstract
The purpose of the present invention is to provide an audio processing device, playback device, audio processing method, and program whereby an overtone that can seamlessly evoke the fundamental tone can be suitably extracted. As a means for solving this problem, the present invention is provided with: an input unit (input terminal (11)) for inputting an audio signal; a fundamental tone detection unit (13) for detecting the fundamental tone of a low-frequency band from the audio signal; an overtone extraction unit (14) for extracting, from among overtone signals of the fundamental tone, a consonant overtone signal that is in a consonant relationship with respect to the fundamental tone; an overtone control unit (overtone amplifier (15)) for controlling the level of the consonant overtone in accordance with the level of the fundamental tone; and a combination unit (overtone adder (17)) for combining the level-controlled consonant overtone signal with a cut signal obtained by cutting the low-frequency band signal from the input audio signal.
Description
本発明は、再生不可能な低域周波数帯域の低音感を補償する音声処理装置、再生装置、音声処理方法およびプログラムに関するものである。
The present invention relates to an audio processing device, a playback device, an audio processing method, and a program that compensate for low-frequency low frequency bands that cannot be reproduced.
従来、低音域の再生能力が乏しいスピーカーにおいて、再生不可能な低周波数成分の偶数次高調波を発生させ、そのうちの２次高調波を抽出して音声に加算し、物理的には再生されていない低周波数成分を聴覚的に感じさせる（ミッシングファンダメンタル現象）低音増強回路が提案されている（特許文献１参照）。すなわち、この低音増強回路は、再生不可能な低音（基音）を、再生可能な第２倍音に変換することで、低音を補償する。このように、この低音増強回路は、基音の１オクターブ上の音にあたる第２倍音を用いて基音を補償するため、再生される倍音が、基音に対して不協和音とならず、違和感なく基音を感じさせることができる。
Conventionally, in speakers with low bass reproduction capability, even harmonics of low frequency components that cannot be reproduced are generated, and the second harmonics are extracted and added to the sound, which is physically reproduced. There has been proposed a bass enhancement circuit that makes an audible feel of a low frequency component (missing fundamental phenomenon) (see Patent Document 1). That is, the bass enhancement circuit compensates for bass by converting a bass (fundamental tone) that cannot be reproduced into a second overtone that can be reproduced. In this way, this bass enhancement circuit compensates for the fundamental using the second harmonic, which is one octave higher than the fundamental, so that the reproduced harmonic does not become dissonant with the fundamental, and feels the fundamental without any discomfort. Can be made.
ところで、低音域の再生能力が乏しいスピーカーの場合、基音を感じさせるための第２倍音が再生不可能な低域周波数帯域内にあり再生できない可能性がある。よって、このような場合、基音を感じさせるための倍音として、より高次の倍音を選択せざるを得ない。しかし、上記の技術を用いて、生成した基音の偶数次高調波から、第２倍音より高次の偶数次倍音信号を抽出した場合、基音に対して不協和関係となる倍音信号を抽出する可能性がある。このような倍音信号を音声信号に加算した場合、再生音は違和感の伴う不自然なものとなる。
By the way, in the case of a speaker with poor reproduction capability in the low frequency range, the second overtone for making the fundamental sound feel is in the low frequency band where it cannot be reproduced and may not be reproduced. Therefore, in such a case, higher harmonics have to be selected as harmonics for making the fundamental sound feel. However, it is possible to extract a harmonic signal that is incongruent with the fundamental tone when the higher harmonic order harmonic signal higher than the second harmonic is extracted from the even harmonics of the generated fundamental tone using the above technique. There is sex. When such a harmonic signal is added to the audio signal, the reproduced sound is unnatural with a sense of incongruity.
本発明は、違和感なく基音を感じさせることのできる倍音信号を適切に抽出することのできる音声処理装置、再生装置、音声処理方法およびプログラムを提供することを目的とする。
An object of the present invention is to provide a sound processing device, a playback device, a sound processing method, and a program capable of appropriately extracting a harmonic signal that can make a fundamental sound feel uncomfortable.
本発明の音声処理装置は、音声信号を入力する入力部と、音声信号から、低域周波数帯域の基音を検出する基音検出部と、基音の倍音信号のうち、基音に対して協和関係となる協和倍音信号を抽出する協和倍音抽出部と、基音のレベルに応じて、協和倍音信号のレベルを制御する倍音制御部と、入力された音声信号のうち低域周波数帯域の信号をカットしたカット信号に、レベル制御された協和倍音信号を合算する合算部と、を備えたことを特徴とする。
The speech processing apparatus of the present invention has a cooperative relationship with the fundamental tone among the fundamental tone detection signal and the fundamental tone detection portion that detects the fundamental tone of the low frequency band from the speech signal, the input unit that inputs the speech signal, A Kyowa overtone extraction unit that extracts the Kyowa overtone signal, a harmonic control unit that controls the level of the Kyowa overtone signal according to the level of the fundamental tone, and a cut signal obtained by cutting the low frequency band signal of the input audio signal And a summing unit for summing up the level-controlled Kyowa overtone signals.
本発明の音声処理方法は、音声信号を入力する入力ステップと、音声信号から、低域周波数帯域の基音を検出する基音検出ステップと、基音の倍音信号のうち、基音に対して協和関係となる協和倍音信号を抽出する協和倍音抽出ステップと、基音のレベルに応じて、協和倍音信号のレベルを制御する倍音制御ステップと、入力された音声信号のうち低域周波数帯域の信号をカットしたカット信号に、レベル制御された協和倍音信号を合算する合算ステップと、を備えたことを特徴とする。
The speech processing method of the present invention has a cooperative relationship with a fundamental tone among an input step of inputting a speech signal, a fundamental tone detecting step of detecting a fundamental tone in a low frequency band from the speech signal, and a harmonic overtone signal of the fundamental tone. A Kyowa overtone extraction step for extracting Kyowa overtone signals, a harmonic overtone control step for controlling the level of the Kyowa overtone signal according to the level of the fundamental tone, and a cut signal obtained by cutting the low frequency band signal of the input audio signal And a summing step for summing the level-controlled Kyowa overtone signals.
本発明のプログラムは、コンピューターに、上記の音声処理方法における各ステップを実行させることを特徴とする。
The program of the present invention causes a computer to execute each step in the voice processing method.
これらの構成によれば、基音に対して協和関係となる倍音信号のみを抽出するため、高次であっても、違和感なく基音を感じさせることのできる倍音信号を適切に抽出することができる。なお、協和倍音抽出部は、カットされる低域周波数帯域を超える周波数の協和倍音信号を抽出することが望ましい。
According to these configurations, since only the harmonic signal that is in a cooperative relationship with the fundamental tone is extracted, it is possible to appropriately extract the harmonic signal that allows the fundamental tone to be felt without any sense of incongruity even in higher order. In addition, it is desirable that the Kyowa overtone extraction unit extracts a Kyowa overtone signal having a frequency exceeding the low frequency band to be cut.
この場合、基音検出部は、基音のレベルを検出し、協和倍音抽出部は、基音のレベルに応じて、抽出対象となる協和倍音信号を可変することが好ましい。
In this case, it is preferable that the fundamental tone detection unit detects the level of the fundamental tone, and the Kyowa overtone extraction unit varies the Kyowa overtone signal to be extracted according to the level of the fundamental tone.
この場合、協和倍音抽出部は、基音のレベルが高い場合、基音のレベルが低い場合に比べて、より高次の倍音信号を抽出することが好ましい。
In this case, it is preferable that the Kyowa harmonic extraction unit extracts a higher harmonic signal when the fundamental level is higher than when the fundamental level is low.
この構成によれば、音声信号のレベルが高いほど、カット信号の周波数帯域が高くなるため、より高次の倍音信号を抽出することにより、再生可能な高次の倍音信号を選択することができる。
According to this configuration, the higher the level of the audio signal is, the higher the frequency band of the cut signal is. Therefore, a higher-order harmonic signal that can be reproduced can be selected by extracting a higher-order harmonic signal. .
この場合、協和倍音抽出部は、低域周波数帯域を超える周波数帯域から所定の高域周波数帯域をカットしたバンド帯域から協和倍音信号を抽出することが好ましい。
In this case, it is preferable that the Kyowa overtone extraction unit extracts a Kyowa overtone signal from a band band obtained by cutting a predetermined high frequency band from a frequency band exceeding the low band frequency band.
この構成によれば、低域周波数帯域を超える周波数帯域から次数の低いもの、且つ個数を制限した協和倍音信号を抽出することができるため、より精度よく基音を感じさせることのできる協和倍音信号を効率的に抽出することができる。
According to this configuration, it is possible to extract low harmonics and limited harmonic harmonic signals from a frequency band that exceeds the low frequency band, so that a harmonic harmonic signal that can make the fundamental sound more accurate can be obtained. It can be extracted efficiently.
本発明の再生装置は、上記の音声処理装置と、音声処置装置により処理された音声信号を外部に出力する音声出力部と、を備えたことを特徴とする。
A playback device according to the present invention includes the above-described sound processing device and a sound output unit that outputs a sound signal processed by the sound processing device to the outside.
この構成によれば、物理的に再生されない低音を精度よく感じさせることのできる再生装置を提供することができる。
According to this configuration, it is possible to provide a playback device that can accurately sense bass that is not physically played back.
以下、添付の図面を参照して、本発明の一実施形態にかかる音声処理装置、再生装置、音声処理方法およびプログラムについて説明する。図１は、本実施形態にかかる再生装置１の回路構成を示している。図示のように、再生装置１は、入力した音声信号に対して所定の処理を行う音声処理装置２と、音声処理装置２により処理された音声信号を外部に出力するスピーカー３（音声出力部）と、を備えている。
Hereinafter, a sound processing device, a playback device, a sound processing method, and a program according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a circuit configuration of a reproducing apparatus 1 according to the present embodiment. As shown in the figure, a playback device 1 includes a sound processing device 2 that performs predetermined processing on an input sound signal, and a speaker 3 (sound output unit) that outputs the sound signal processed by the sound processing device 2 to the outside. And.
ここで、図２を用いて本実施形態のスピーカー３について説明する。同図は、スピーカー３の音声信号の再生能力を示したものである。図示のように、スピーカー３は、７００Ｈｚ以下の周波数帯域において、音声信号の出力レベルが下降する。すなわち、本スピーカー３は、低音の再生限界が７００Ｈｚであることを示している。以下、音声信号の出力レベルが下降する７００Ｈｚ以下の周波数帯域を「再生不能帯域」と称す。なお、請求項における「低域周波数帯域」は、この再生不能帯域をさす。音声処理装置２は、上記のように低音の生成能力が乏しいスピーカー３において、再生不能帯域の音声信号を、人間の聴覚錯覚を利用して補償するための音声処理を行う。すなわち、音声処置装置２は、再生不能帯域内の基音となる音声信号に対して、２以上の整数倍の周波数を持つ倍音信号を強調させて、基音を補償する音声処理を行う。
Here, the speaker 3 of the present embodiment will be described with reference to FIG. The figure shows the audio signal reproduction capability of the speaker 3. As illustrated, in the speaker 3, the output level of the audio signal decreases in a frequency band of 700 Hz or less. That is, this speaker 3 indicates that the reproduction limit of bass is 700 Hz. Hereinafter, the frequency band of 700 Hz or less where the output level of the audio signal decreases is referred to as “unreproducible band”. The “low frequency band” in the claims refers to this non-reproducible band. The sound processing device 2 performs sound processing for compensating for a sound signal in a non-reproducible band using a human auditory illusion in the speaker 3 having a low bass generation capability as described above. That is, the voice treatment device 2 performs voice processing for compensating the fundamental tone by enhancing the harmonic signal having a frequency that is an integer multiple of 2 or more with respect to the speech signal that is the fundamental tone in the non-reproducible band.
続いて、図１を参照し、音声処理装置２について説明する。同図に示すように、音声処理装置２は、入力端子１１（入力部）と、ハイパスフィルター１２（ＨＰＦ）と、基音検出部１３と、倍音抽出部１４（協和倍音抽出部）と、倍音増幅器１５（倍音制御部）と、倍音合算器１６と、倍音加算器１７（合算部）と、出力端子１８と、を備えている。
Subsequently, the voice processing device 2 will be described with reference to FIG. As shown in the figure, the speech processing apparatus 2 includes an input terminal 11 (input unit), a high-pass filter 12 (HPF), a fundamental tone detection unit 13, a harmonic overtone extraction unit 14 (a Kyowa overtone extraction unit), and a harmonic overtone amplifier. 15 (overtone control unit), overtone adder 16, overtone adder 17 (addition unit), and output terminal 18.
入力端子１１は、再生する音声信号を入力する。ハイパスフィルター１２は、入力した音声信号から再生不能帯域の音声信号をカットする。すなわち、ハイパスフィルター１２は、スピーカー３の再生不能帯域である７００Ｈｚ以下の周波数帯域の音声信号をカットし、スピーカー３が再生可能な７００Ｈｚより周波数の大きい帯域の音声信号のみを通過させる。これにより、再生限界を超えた周波数の音声信号がスピーカー３に出力されて、異音を発生させるのを防ぐ。
The input terminal 11 inputs an audio signal to be reproduced. The high-pass filter 12 cuts an unreproducible band audio signal from the input audio signal. That is, the high-pass filter 12 cuts an audio signal having a frequency band of 700 Hz or less, which is a non-reproducible band of the speaker 3, and passes only an audio signal having a frequency higher than 700 Hz that can be reproduced by the speaker 3. As a result, an audio signal having a frequency exceeding the reproduction limit is output to the speaker 3 to prevent generation of abnormal noise.
基音検出部１３は、入力した音声信号のうち、再生不能帯域における音声信号から１以上の基音を検出する。すなわち、スピーカー３が物理的に再生できない基音（上記のハイパスフィルター１２によりカットされる基音）を検出する。基音検出部１３により検出された基音は、聴覚錯覚の対象となる音である。なお、基音検出部１３は、基音の周波数とレベルとを検出する。
The fundamental sound detection unit 13 detects one or more fundamental sounds from the speech signals in the unreproducible band among the input speech signals. That is, a fundamental tone that cannot be physically reproduced by the speaker 3 (a fundamental tone cut by the high-pass filter 12) is detected. The fundamental tone detected by the fundamental tone detector 13 is a sound that is a target of auditory illusion. Note that the fundamental tone detector 13 detects the frequency and level of the fundamental tone.
倍音抽出部１４は、入力した音声信号から、基音検出部１３により検出した１以上の基音の協和倍音信号を抽出する。なお、協和倍音とは、基音の周波数に対し、２以上の整数倍の周波数を持つ音である倍音のうち、基音に対して協和関係となる倍音である（図３参照）。また、協和倍音信号とは、スピーカー３から出力する協和倍音を生成するための音声信号である。この協和倍音がスピーカー３から再生されることにより、基音の聴覚錯覚を引き起こし、再生される音声信号の低音感が補償される。なお、倍音抽出部１４は、入力した音声信号のうち、７００Ｈｚよりも周波数の大きい周波数帯域における音声信号から、協和倍音信号を抽出する。すなわち、スピーカー３が物理的に再生可能な周波数帯域（上記のハイパスフィルター１２を通過する周波数帯域）から協和倍音信号を抽出する。なお、倍音抽出部１４は、次数の低いものから協和倍音信号を抽出すると共に、聴覚錯覚させる基音のレベルに応じて協和倍音信号の次数を可変する（いずれも詳しくは後述する）。
The harmonic overtone extraction unit 14 extracts one or more fundamental harmonic overtone signals detected by the fundamental tone detection unit 13 from the input voice signal. The harmonic harmonic is a harmonic that has a harmonic relationship with the fundamental tone among harmonics having a frequency that is an integer multiple of 2 or more with respect to the frequency of the fundamental tone (see FIG. 3). The Kyowa overtone signal is an audio signal for generating a Kyowa overtone output from the speaker 3. By reproducing the Kyowa overtone from the speaker 3, the auditory illusion of the fundamental tone is caused, and the low tone of the reproduced audio signal is compensated. The harmonic overtone extraction unit 14 extracts a Kyowa overtone signal from an audio signal in a frequency band having a frequency higher than 700 Hz among the input audio signals. That is, a Kyowa overtone signal is extracted from a frequency band (frequency band that passes through the high-pass filter 12) that can be physically reproduced by the speaker 3. Note that the harmonic overtone extraction unit 14 extracts the Kyowa overtone signal from the lower order, and changes the order of the Kyowa overtone signal according to the level of the fundamental tone to be auditory illusion (both will be described later in detail).
倍音増幅器１５は、検出した基音のレベルに応じて、抽出した協和倍音信号のレベルを制御する。これにより、入力された音声信号に近いレベルで基音を聴覚錯覚させることができる。
The harmonic overtone amplifier 15 controls the level of the extracted Kyowa overtone signal according to the level of the detected fundamental tone. Thereby, it is possible to make an auditory illusion of the fundamental tone at a level close to the input audio signal.
倍音合算器１６は、倍音抽出部１４が抽出し、倍音増幅器１５によりレベル制御された協和倍音信号を合算する。倍音加算器１７は、上記のハイパスフィルター１２により再生不能帯域がカットされた音声信号（カット信号）に、上記の合算された倍音信号を加算する。出力端子１８は、合算された倍音信号が加算されたカット信号をスピーカー３に出力する。
The harmonic overtone adder 16 adds up the Kyowa overtone signals extracted by the overtone extraction unit 14 and level-controlled by the overtone amplifier 15. The overtone adder 17 adds the above-described overtone signal added to the audio signal (cut signal) from which the unreproducible band is cut by the high-pass filter 12. The output terminal 18 outputs a cut signal to which the summed harmonic signals are added to the speaker 3.
ここで、図３を参照し、基音と倍音との協和関係について説明する。同図は、基音と第２倍音～第２０倍音の倍音との協和関係を示している。同図に示すように、第２～６倍音、第８倍音、第１０倍音、第１２倍音、第１６倍音、および第２０倍音が、基音に対して協和関係となる協和倍音である。一方、第７倍音、第９倍音、第１１倍音、第１３～１５倍音、および第１７～１９倍音が、基音に対して不協和関係となる不協和倍音である。図に例示しているように、基音がＣ１である場合、倍音の音の種類がＣ，Ｅ，Ｇのいずれかであるものが協和倍音となる。つまり、基音がＣの場合、２以上の整数倍の周波数を持つ倍音のうち、Ｃに３度音程の音を２個積み重ねた三和音を構成する音が協和倍音となる。倍音抽出部１４は、第２倍音～第２０倍音のうち、上記の協和倍音を生成する協和倍音信号を抽出する。
Here, the cooperative relationship between the fundamental tone and the harmonic overtone will be described with reference to FIG. This figure shows the cooperative relationship between the fundamental tone and the second to twentieth overtones. As shown in the figure, the second to sixth overtones, the eighth overtone, the tenth overtone, the twelfth overtone, the sixteenth overtone, and the twentieth overtone are consonant overtones that have a consonant relationship with the fundamental tone. On the other hand, the seventh overtone, the ninth overtone, the eleventh overtone, the thirteenth through the fifteenth overtone, and the seventeenth through the nineteenth overtone are dissonant overtones that are in a dissonant relationship with the fundamental tone. As illustrated in the figure, when the fundamental tone is C1, the harmonic overtone is any one of C, E, and G. That is, when the fundamental tone is C, among the harmonics having an integer multiple of 2 or more, the sound constituting the triad obtained by stacking two sounds of about 3 degrees on C is the Kyowa overtone. The harmonic overtone extracting unit 14 extracts a harmonic harmonic signal that generates the above harmonic harmonic from the second harmonic to the twentieth harmonic.
続いて、図４を参照し、倍音抽出部１４が抽出する倍音信号について詳細に説明する。同図は、「所定のレベル」の各基音に対する第２倍音～第２０倍音の各周波数を示している。また、図示における網掛け部が、倍音抽出部１４の抽出候補となる倍音信号の帯域を示している。すなわち、倍音抽出部１４は、７００Ｈｚ～２１００Ｈｚの周波数帯域における音声信号から倍音信号を抽出する。なお、上記の通り、倍音抽出部１４は、７００Ｈｚ～２１００Ｈｚの周波数帯域における倍音信号のうち、基音に対して不協和関係となる不協和倍音信号を排除して、基音に対して協和関係となる協和倍音信号のみを抽出する。
Subsequently, the harmonic signal extracted by the harmonic extraction unit 14 will be described in detail with reference to FIG. This figure shows the frequencies of the second to twentieth harmonics for each fundamental tone of “predetermined level”. Further, the shaded portion in the figure indicates the band of the harmonic signal that is the extraction candidate of the harmonic extraction unit 14. That is, the harmonic overtone extraction unit 14 extracts a harmonic overtone signal from an audio signal in a frequency band of 700 Hz to 2100 Hz. Note that, as described above, the harmonic overtone extraction unit 14 eliminates the dissonance overtone signal that is incoordinating with the fundamental tone from the overtone signals in the frequency band of 700 Hz to 2100 Hz, and has a cooperative relationship with the fundamental tone. Only the Kyowa harmonic signal is extracted.
図４に示すように、倍音信号を抽出する周波数帯域が、７００Ｈｚより周波数の大きい周波数帯域に制限されているのは、上記のハイパスフィルター１２により出力する７００Ｈｚ以下の周波数帯域をカットしているためである。つまり、倍音抽出部１４は、再生可能な周波数帯域の音声信号から協和倍音信号を抽出する。一方、倍音を抽出する周波数帯域が、２１００Ｈｚ以下に制限されているのは、抽出する協和倍音信号の個数を制限し、且つ再生可能な周波数帯域において次数の低いものから抽出するためである。本実施形態では、抽出される協和倍音信号が、最高５個となるように、抽出可能な周波数帯域が設定されている。例えば、図示のように、基音がＡ＃２およびＢ２の場合、抽出される協和倍音信号は、第６倍音、第８倍音、第１０倍音、第１２倍音、および第１６倍音を生成する５個の倍音信号となり、その他の音が基音の場合、抽出される協和倍音信号は、４個以下となる。このように抽出する協和倍音信号の個数を制限することにより、協和倍音抽出のための演算処理量を軽減することができる。
As shown in FIG. 4, the reason why the frequency band from which the harmonic signal is extracted is limited to a frequency band having a frequency higher than 700 Hz is because the frequency band of 700 Hz or less output by the high-pass filter 12 is cut. It is. That is, the harmonic overtone extraction unit 14 extracts the Kyowa overtone signal from the reproducible frequency band audio signal. On the other hand, the reason why the frequency band for extracting overtones is limited to 2100 Hz or less is to limit the number of Kyowa overtone signals to be extracted, and to extract from the lowest order in the reproducible frequency band. In the present embodiment, the frequency bands that can be extracted are set so that the maximum number of Kyowa overtone signals to be extracted is five. For example, as shown in the figure, when the fundamental tone is A # 2 and B2, the extracted harmonic harmonic signals are five that generate the sixth harmonic, the eighth harmonic, the tenth harmonic, the twelfth harmonic, and the sixteenth harmonic. If the other sound is a fundamental tone, the number of extracted Kyowa overtone signals is four or less. By limiting the number of consonant harmonic signals to be extracted in this way, it is possible to reduce the amount of calculation processing for extracting consonant harmonics.
続いて、図５を参照し、基音のレベルごとの抽出する協和倍音信号の次数について説明する。本実施形態のスピーカー３は、出力する音声信号のレベルが大きくなるにつれ、ハイパスフィルター１２によりカットする周波数を引き上げる。よって、抽出可能な協和倍音信号も変化する。同図は、基音がＡ３のとき、基音のレベル（但し、レベル１＜レベル２＜レベル３）に応じて抽出する協和倍音信号を示している。図示のように、倍音抽出部１４は、基音のレベルが、所定のレベル１であった場合、第４倍音、第５倍音、第６倍音、第８倍音の倍音信号を抽出し、所定のレベル２であった場合、第５倍音、第６倍音、第８倍音の倍音信号を抽出し、所定のレベル３であった場合、第第６倍音、第８倍音の倍音信号を抽出する。なお、同図のレベル１は、図４における抽出結果を示している。なお、協和倍音信号は、基音のレベルにかかわらず、最低２個以上抽出されることが好ましい。
Subsequently, with reference to FIG. 5, the order of the Kyowa overtone signal to be extracted for each fundamental tone level will be described. The speaker 3 of the present embodiment raises the frequency cut by the high-pass filter 12 as the level of the output audio signal increases. Therefore, the extractable Kyowa overtone signal also changes. This figure shows a Kyowa overtone signal extracted according to the level of the fundamental tone (where level 1 <level 2 <level 3) when the fundamental tone is A3. As shown in the figure, when the level of the fundamental tone is a predetermined level 1, the harmonic overtone extraction unit 14 extracts a harmonic signal of the fourth overtone, the fifth overtone, the sixth overtone, and the eighth overtone, and the predetermined level. If it is 2, harmonic signals of the 5th harmonic, 6th harmonic, and 8th harmonic are extracted. If the level is 3, the harmonic signals of the 6th and 8th harmonics are extracted. In addition, level 1 of the same figure has shown the extraction result in FIG. It is preferable that at least two Kyowa harmonic signals are extracted regardless of the level of the fundamental tone.
以下、図６のフローチャートを参照し、音声処理装置２の音声処理について説明する。音声処理装置２は、先ず、再生不能帯域（低周波数帯域）における基音を検出する（Ｓ０１）。そして、検出した基音の周波数およびレベルに応じて、抽出する協和倍音信号の周波数を算出する（Ｓ０２）。そして、音声信号から再生不能帯域をカットしたカット信号から協和倍音信号を抽出する（Ｓ０３）。検出した基音のレベルに応じて、抽出した協和倍音信号のレベルを制御し（Ｓ０４）、レベル制御した協和倍音信号を、カット信号に加算する（Ｓ０５）。
Hereinafter, the audio processing of the audio processing device 2 will be described with reference to the flowchart of FIG. First, the sound processing device 2 detects a fundamental tone in a non-reproducible band (low frequency band) (S01). Then, the frequency of the Kyowa overtone signal to be extracted is calculated according to the detected fundamental frequency and level (S02). Then, a Kyowa overtone signal is extracted from the cut signal obtained by cutting the unreproducible band from the audio signal (S03). In accordance with the level of the detected fundamental tone, the level of the extracted harmonic harmonic signal is controlled (S04), and the level-controlled harmonic harmonic signal is added to the cut signal (S05).
これまで説明した再生装置１によれば、口径の小さいスピーカー３、キャビネットの容量の小さいスピーカー３など、低音の再生能力が乏しいスピーカー３を用いて音声信号を再生する場合、再生不能な低音を聴覚錯覚させるための倍音が高次のものしか抽出できない場合であっても、低音（基音）に対して協和関係となる協和倍音信号のみを抽出するため、違和感なく基音を感じさせることのできる倍音を適切に抽出することができる。
According to the playback device 1 described so far, when playing back an audio signal using a speaker 3 with a low bass reproduction capability, such as a speaker 3 with a small diameter or a speaker 3 with a small cabinet capacity, the bass that cannot be reproduced is heard. Even if only high-order harmonics can be extracted for the illusion, only the harmonic harmonic signal that is in a cooperative relationship with the bass (fundamental tone) is extracted. It can be extracted appropriately.
また、上記の構成によれば、音声処理装置２は、入力された音声信号に含まれる協和倍音成分（協和倍音信号）をレベル制御することによって強調し、基音を聴覚錯覚させるため、基音の協和倍音成分を別途生成する必要がない。よって、装置の複雑化、処理の煩雑化を抑えることができる。
In addition, according to the above configuration, the sound processing device 2 emphasizes the level of the consonant harmonic component (consonant overtone signal) included in the input sound signal and controls the fundamental tone to make an auditory illusion. There is no need to generate overtone components separately. Therefore, it is possible to suppress complication of the apparatus and complicated processing.
なお、上記の各実施形態に示した、音声処理装置２の各構成要素をプログラムとして提供することも可能である。また、そのプログラムを記憶媒体（図示省略）に格納して提供することも可能である。記録媒体としては、ＣＤ－ＲＯＭ、フラッシュＲＯＭ、メモリカード、コンパクトディスク、光磁気ディスク等を利用することができる。
In addition, it is also possible to provide each component of the voice processing device 2 shown in each of the above embodiments as a program. It is also possible to provide the program stored in a storage medium (not shown). As the recording medium, a CD-ROM, a flash ROM, a memory card, a compact disk, a magneto-optical disk, or the like can be used.
また、上述した実施例によらず、音声処理装置２および再生装置１の装置構成や処理工程等について、本発明の要旨を逸脱しない範囲で、適宜変更も可能である。
In addition, the configuration and processing steps of the audio processing device 2 and the playback device 1 can be appropriately changed without departing from the gist of the present invention, regardless of the above-described embodiments.
１：再生装置 ２：音声処理装置 ３：スピーカー １１：入力端子 １２：ハイパスフィルター １３：基音検出部 １４：倍音抽出部 １５：倍音増幅器 １７：倍音加算器 １８：出力端子
1: Playback device 2: Audio processing device 3: Speaker 11: Input terminal 12: High-pass filter 13: Fundamental tone detection unit 14: Overtone extraction unit 15: Overtone amplifier 17: Overtone adder 18: Output terminal
Claims (7)
- 音声信号を入力する入力部と、
前記音声信号から、低域周波数帯域の基音を検出する基音検出部と、
前記基音の倍音信号のうち、前記基音に対して協和関係となる協和倍音信号を抽出する協和倍音抽出部と、
前記基音のレベルに応じて、前記協和倍音信号のレベルを制御する倍音制御部と、
入力された前記音声信号のうち前記低域周波数帯域の信号をカットしたカット信号に、レベル制御された前記協和倍音信号を合算する合算部と、を備えたことを特徴とする音声処理装置。 An input unit for inputting an audio signal;
A fundamental tone detector for detecting a fundamental tone in a low frequency band from the audio signal;
Among the harmonic signals of the fundamental tone, a Kyowa overtone extraction unit that extracts a Kyowa harmonic signal that is in a cooperative relationship with the fundamental tone;
A harmonic control unit that controls the level of the Kyowa overtone signal according to the level of the fundamental tone;
An audio processing apparatus comprising: a summing unit that adds the level-controlled Kyowa overtone signal to a cut signal obtained by cutting the low frequency band signal of the input audio signal. - 前記基音検出部は、前記基音のレベルを検出し、
前記協和倍音抽出部は、前記基音のレベルに応じて、抽出対象となる前記協和倍音信号を可変することを特徴とする請求項１に記載の音声処理装置。 The fundamental tone detection unit detects a level of the fundamental tone,
The speech processing apparatus according to claim 1, wherein the Kyowa overtone extraction unit varies the Kyowa overtone signal to be extracted according to the level of the fundamental tone. - 前記協和倍音抽出部は、前記基音のレベルが高い場合、前記基音のレベルが低い場合に比べて、より高次の前記協和倍音信号を抽出することを特徴とする請求項２に記載の音声処理装置。 3. The audio processing according to claim 2, wherein the Kyowa overtone extraction unit extracts the higher-order Kyowa overtone signal when the level of the fundamental tone is high compared to when the level of the fundamental tone is low. apparatus.
- 前記協和倍音抽出部は、前記低域周波数帯域を超える周波数帯域から所定の高域周波数帯域をカットしたバンド帯域から前記協和倍音信号を抽出することを特徴とする請求項１に記載の音声処理装置。 2. The speech processing apparatus according to claim 1, wherein the consonant overtone extracting unit extracts the consonant overtone signal from a band band obtained by cutting a predetermined high frequency band from a frequency band exceeding the low frequency band. .
- 請求項１ないし５のいずれかに記載の音声処理装置と、
前記音声処置装置により処理された音声信号を外部に出力する音声出力部と、を備えたことを特徴とする再生装置。 A voice processing device according to any one of claims 1 to 5;
An audio output unit that outputs an audio signal processed by the audio treatment device to the outside. - 音声信号を入力する入力ステップと、
前記音声信号から、低域周波数帯域の基音を検出する基音検出ステップと、
前記基音の倍音信号のうち、前記基音に対して協和関係となる協和倍音信号を抽出する協和倍音抽出ステップと、
前記基音のレベルに応じて、前記協和倍音のレベルを制御する倍音制御ステップと、
入力された前記音声信号のうち前記低域周波数帯域の信号をカットしたカット信号に、レベル制御された前記協和倍音信号を合算する合算ステップと、を備えたことを特徴とする音声処理方法。 An input step for inputting an audio signal;
A fundamental tone detection step for detecting a fundamental tone in a low frequency band from the audio signal;
A harmonic overtone extraction step of extracting a harmonic harmonic signal that is in a cooperative relationship with the fundamental tone from the harmonic overtone signal of the fundamental tone;
Overtone control step for controlling the level of the Kyowa overtone according to the level of the fundamental tone;
And a summing step of summing the level-controlled Kyowa overtone signal to a cut signal obtained by cutting the low frequency band signal of the input sound signal. - コンピューターに、請求項６に記載の音声処理方法における各ステップを実行させるためのプログラム。 A program for causing a computer to execute each step in the voice processing method according to claim 6.
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