JP5621519B2 - Sound processor - Google Patents

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JP5621519B2
JP5621519B2 JP2010248266A JP2010248266A JP5621519B2 JP 5621519 B2 JP5621519 B2 JP 5621519B2 JP 2010248266 A JP2010248266 A JP 2010248266A JP 2010248266 A JP2010248266 A JP 2010248266A JP 5621519 B2 JP5621519 B2 JP 5621519B2
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adjustment value
unit
adjustment
signal level
signal
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田中　啓文
啓文 田中
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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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/02—Manually-operated control

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  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
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Description

本発明は、音響信号の信号レベルを調整する技術に関する。   The present invention relates to a technique for adjusting a signal level of an acoustic signal.

音響信号が供給される増幅器のゲインを音響信号の信号レベルに応じて可変に制御する技術（コンプレッサやリミッタ）が従来から提案されている。例えば特許文献１（図５）には、音響信号を帯域分割した複数の帯域成分の各々の信号レベルに応じて設定された定数を音響信号に乗算するリミッタ装置が開示されている。   Conventionally, a technique (compressor or limiter) for variably controlling the gain of an amplifier to which an acoustic signal is supplied in accordance with the signal level of the acoustic signal has been proposed. For example, Patent Document 1 (FIG. 5) discloses a limiter device that multiplies an acoustic signal by a constant set according to the signal level of each of a plurality of band components obtained by dividing the band of the acoustic signal.

特許第２９２１３７５号公報Japanese Patent No. 2921375

しかし、特許文献１に開示された技術では、音響信号を帯域分割した全部の帯域成分の信号レベルが音響信号に対する乗算値に反映される。したがって、例えば利用者が充分な信号レベルでの聴取を所望する特定の帯域成分の信号レベルが増加した場合にも音響信号の信号レベルが強制的に抑制されるという問題や、特定の帯域成分の信号レベルが増加して音響信号の信号レベルを抑制すべき状況なのに他の帯域成分の信号レベルが過度に低い影響で音響信号の信号レベルが充分に抑制されないという問題が発生し得る。以上の事情を考慮して、本発明は、音響信号の特定の帯域成分を選択的に音響信号の信号レベルの調整に反映させることを目的とする。   However, in the technique disclosed in Patent Document 1, the signal levels of all the band components obtained by dividing the sound signal into bands are reflected in the multiplication values for the sound signals. Therefore, for example, when the signal level of a specific band component that the user desires to listen at a sufficient signal level increases, the signal level of the acoustic signal is forcibly suppressed, There is a problem that the signal level of the acoustic signal is not sufficiently suppressed due to the influence of the signal level of the other band component being excessively low although the signal level is increased and the signal level of the acoustic signal should be suppressed. In view of the above circumstances, an object of the present invention is to selectively reflect a specific band component of an acoustic signal in the adjustment of the signal level of the acoustic signal.

以上の課題を解決するために本発明が採用する手段を説明する。なお、本発明の理解を容易にするために、以下の説明では、本発明の要素と後述の実施形態の要素との対応を括弧書で付記するが、本発明の範囲を実施形態の例示に限定する趣旨ではない。   Means employed by the present invention to solve the above problems will be described. In order to facilitate the understanding of the present invention, in the following description, the correspondence between the elements of the present invention and the elements of the embodiments described later will be indicated in parentheses, but the scope of the present invention will be exemplified in the embodiments. It is not intended to be limited.

本発明の音響処理装置は、入力音響信号（例えば音響信号ＳIN）の信号レベルを調整値（例えば調整値Ｇ）に応じて調整して出力音響信号（例えば音響信号ＳOUT）を生成する信号調整手段（例えば信号調整部１２）と、入力音響信号または出力音響信号を複数の帯域成分（例えば帯域成分Ｂ[1]〜Ｂ[N]）に分割する帯域分割手段（例えば帯域分割部２２）と、各帯域成分に対応する複数の調整値設定手段（例えば調整値設定部３０[1]〜３０[N]）であって、入力音響信号に対する出力音響信号の信号レベルが当該帯域成分の信号レベルに応じて変化するように各々が調整値（例えば調整値Ｃ[1]〜Ｃ[N]）を可変に設定する複数の調整値設定手段と、複数の調整値設定手段が設定した複数の調整値のうち信号調整手段に適用される調整値を選択する調整値選択手段（例えば調整値選択部２６）とを具備する。例えば、調整値設定手段は、帯域成分の信号レベルが増加するほど入力音響信号に対する出力音響信号の信号レベルが抑制されるように各調整値を可変に設定する。以上の構成においては、各帯域成分に対応する複数の調整値のうち信号調整手段に適用される調整値が選択されるから、入力音響信号の特定の帯域成分の信号レベルを選択的に出力音響信号の信号レベルに反映させることが可能である。   The sound processing apparatus of the present invention adjusts the signal level of an input sound signal (for example, sound signal SIN) according to an adjustment value (for example, adjustment value G) to generate an output sound signal (for example, sound signal SOUT). (For example, the signal adjusting unit 12), band dividing means (for example, the band dividing unit 22) for dividing the input acoustic signal or the output acoustic signal into a plurality of band components (for example, band components B [1] to B [N]), A plurality of adjustment value setting means (for example, adjustment value setting units 30 [1] to 30 [N]) corresponding to each band component, and the signal level of the output acoustic signal with respect to the input acoustic signal becomes the signal level of the band component. A plurality of adjustment value setting means for variably setting the adjustment values (for example, adjustment values C [1] to C [N]) so as to change in response, and a plurality of adjustment values set by the plurality of adjustment value setting means To select the adjustment value to be applied to the signal adjustment means. ; And a value selection means (e.g., the adjustment value selecting section 26). For example, the adjustment value setting means variably sets each adjustment value so that the signal level of the output acoustic signal with respect to the input acoustic signal is suppressed as the signal level of the band component increases. In the above configuration, the adjustment value applied to the signal adjustment means is selected from among a plurality of adjustment values corresponding to each band component, so that the signal level of a specific band component of the input sound signal is selectively output to the output sound. It is possible to reflect the signal level of the signal.

本発明の好適な態様において、調整値選択手段は、利用者からの指示に応じて調整値を選択する。以上の態様においては、利用者からの指示に応じた調整値が選択されるから、複数の帯域成分のうち利用者の所望の帯域成分の信号レベルが出力音響信号の信号レベルに反映されるという利点がある。なお、以上の態様の具体例は例えば第１実施形態として後述される。   In a preferred aspect of the present invention, the adjustment value selection means selects an adjustment value in accordance with an instruction from the user. In the above aspect, since an adjustment value corresponding to an instruction from the user is selected, the signal level of the user's desired band component among the plurality of band components is reflected in the signal level of the output acoustic signal. There are advantages. In addition, the specific example of the above aspect is later mentioned as 1st Embodiment, for example.

本発明の好適な態様において、調整値選択手段は、複数の帯域成分のうち信号レベルが最大の帯域成分に対応する調整値を選択する。以上の態様においては、信号レベルが最大の帯域成分に対応する調整値が選択されるから、信号レベルが最大の帯域成分以外の成分の信号レベルが充分に低い場合でも、出力音響信号の信号レベルを適切に抑制することが可能である。なお、以上の態様の具体例は例えば第２実施形態として後述される。 In a preferred aspect of the present invention, the adjustment value selection means selects an adjustment value corresponding to a band component having the maximum signal level among a plurality of band components. In the above aspect, since the adjustment value corresponding to the band component having the maximum signal level is selected, the signal level of the output acoustic signal can be obtained even when the signal level of the component other than the band component having the maximum signal level is sufficiently low. Can be appropriately suppressed. In addition, the specific example of the above aspect is later mentioned as 2nd Embodiment, for example.

本発明の好適な態様に係る音響処理装置は、各帯域成分の信号レベルを帯域成分毎に個別に調整して各調整値設定手段に供給する帯域成分調整手段（例えば帯域成分調整部５０）を具備する。以上の態様においては、各帯域成分の信号レベルが帯域成分調整部にて個別に調整されるから、各調整値設定部が生成する調整値を調整値選択部が選択する可能性を帯域成分毎に個別に制御できるという利点がある。なお、以上の態様の具体例は例えば第３実施形態として後述される。 The acoustic processing apparatus according to a preferred aspect of the present invention includes a band component adjusting unit (for example, a band component adjusting unit 50) that individually adjusts the signal level of each band component and supplies the adjusted signal level to each adjustment value setting unit. It has. In the above aspect, since the signal level of each band component is individually adjusted by the band component adjustment unit, the possibility that the adjustment value selection unit selects the adjustment value generated by each adjustment value setting unit is determined for each band component. There is an advantage that can be individually controlled. In addition, the specific example of the above aspect is later mentioned as 3rd Embodiment, for example.

本発明の好適な態様に係る音響処理装置は、帯域分割手段から各調整値設定手段を介して調整値選択手段に至る複数の経路の各々の確立および遮断を個別に制御する経路制御手段（例えば経路制御部６０）を具備する。以上の態様においては、帯域分割手段から調整値選択手段に至る複数の経路の各々の確立／遮断が個別に制御されるから、特定の帯域成分に対応する経路を遮断することで、当該帯域成分の信号レベルが出力音響信号の信号レベルに影響することを回避することが可能である。なお、以上の態様の具体例は例えば第４実施形態として後述される。   The sound processing apparatus according to a preferred aspect of the present invention includes path control means (for example, individually controlling establishment and blocking of each of a plurality of paths from the band dividing means to the adjustment value selection means via each adjustment value setting means. A route control unit 60). In the above aspect, since establishment / cutoff of each of a plurality of paths from the band dividing means to the adjustment value selecting means is individually controlled, by cutting off the path corresponding to the specific band component, the band component It is possible to avoid that the signal level affects the signal level of the output acoustic signal. In addition, the specific example of the above aspect is later mentioned as 4th Embodiment, for example.

以上の各態様に係る音響処理装置は、ＤＳＰ（Digital Signal Processor）等の専用の電子回路で実現されるほか、ＣＰＵ（Central Processing Unit）などの汎用の演算処理装置とプログラムとの協働でも実現される。本発明のプログラムは、入力音響信号の信号レベルを調整値に応じて調整して出力音響信号を生成する信号調整手段と、入力音響信号または出力音響信号を複数の帯域成分に分割する帯域分割手段と、各帯域成分に対応する複数の調整値設定手段であって、当該帯域成分の信号レベルが増加するほど入力音響信号に対する出力音響信号の信号レベルが抑制されるように各々が調整値を可変に設定する複数の調整値設定手段と、複数の調整値設定手段が設定した複数の調整値のうち信号調整手段に適用される調整値を選択する調整値選択手段としてコンピュータを機能させる。以上のプログラムによれば、本発明の音響処理装置と同様の効果が実現される。なお、本発明のプログラムは、コンピュータが読取可能な記録媒体に格納された形態で利用者に提供されてコンピュータにインストールされるほか、通信網を介した配信の形態でサーバ装置から提供されてコンピュータにインストールされる。   The sound processing apparatus according to each of the above aspects is realized by a dedicated electronic circuit such as a DSP (Digital Signal Processor) or the like, and also realized by cooperation of a general-purpose arithmetic processing apparatus such as a CPU (Central Processing Unit) and a program. Is done. The program according to the present invention includes a signal adjusting unit that adjusts a signal level of an input acoustic signal according to an adjustment value to generate an output acoustic signal, and a band dividing unit that divides the input acoustic signal or the output acoustic signal into a plurality of band components. And a plurality of adjustment value setting means corresponding to each band component, each of which adjusts the adjustment value so that the signal level of the output acoustic signal relative to the input acoustic signal is suppressed as the signal level of the band component increases. The computer functions as a plurality of adjustment value setting means to be set to and an adjustment value selection means for selecting an adjustment value applied to the signal adjustment means among the plurality of adjustment values set by the plurality of adjustment value setting means. According to the above program, the same effect as the sound processing apparatus of the present invention is realized. The program of the present invention is provided to the user in a form stored in a computer-readable recording medium and installed in the computer, or is provided from the server device in the form of distribution via a communication network. Installed on.

本発明の第１実施形態の音響処理装置のブロック図である。1 is a block diagram of a sound processing apparatus according to a first embodiment of the present invention. 本発明の第３実施形態の音響処理装置のブロック図である。It is a block diagram of the sound processing apparatus of 3rd Embodiment of this invention. 本発明の第４実施形態の音響処理装置のブロック図である。It is a block diagram of the sound processing apparatus of 4th Embodiment of this invention. 本発明の第５実施形態の音響処理装置のブロック図である。It is a block diagram of the sound processing apparatus of 5th Embodiment of this invention. 本発明の第６実施形態の音響処理装置のブロック図である。It is a block diagram of the sound processing apparatus of 6th Embodiment of this invention. 変形例に係る調整値設定部のブロック図である。It is a block diagram of the adjustment value setting part which concerns on a modification. 変形例に係る調整値設定部のブロック図である。It is a block diagram of the adjustment value setting part which concerns on a modification. 変形例に係る音響処理装置のブロック図である。It is a block diagram of the sound processing apparatus which concerns on a modification.

＜Ａ：第１実施形態＞
図１は、本発明の第１実施形態に係る音響処理装置１００Aのブロック図である。音響処理装置１００Aは、上位装置から供給される音響信号ＳINの信号レベルを調整して音響信号ＳOUTを生成する信号処理装置である。第１実施形態の音響処理装置１００Aは、音響信号ＳINの信号レベルの変動幅（ダイナミックレンジ）を減少させて音響信号ＳOUTを生成する効果付与装置（コンプレッサ）として機能する。音響信号ＳINおよび音響信号ＳOUTは、音声や楽音等の音響の時間波形を示すサンプル系列である。 <A: First Embodiment>
FIG. 1 is a block diagram of a sound processing apparatus 100A according to the first embodiment of the present invention. The sound processing device 100A is a signal processing device that generates the sound signal SOUT by adjusting the signal level of the sound signal SIN supplied from the host device. The acoustic processing apparatus 100A according to the first embodiment functions as an effect applying apparatus (compressor) that generates the acoustic signal SOUT by reducing the fluctuation range (dynamic range) of the signal level of the acoustic signal SIN. The acoustic signal SIN and the acoustic signal SOUT are sample sequences indicating time waveforms of sounds such as voice and musical sound.

図１に示すように、音響処理装置１００Aは、信号調整部１２と調整制御部１４と指示受付部１６とを具備する。音響信号ＳINは、信号調整部１２に供給される系統（メインパス）と調整制御部１４に供給される系統（サイドパス）との２系統に分岐する。指示受付部１６は、例えば複数の操作子を含む入力機器で構成されて利用者からの指示を受付ける。   As shown in FIG. 1, the sound processing apparatus 100 </ b> A includes a signal adjustment unit 12, an adjustment control unit 14, and an instruction reception unit 16. The acoustic signal SIN branches into two systems, a system (main path) supplied to the signal adjustment unit 12 and a system (side path) supplied to the adjustment control unit 14. The instruction receiving unit 16 is composed of, for example, an input device including a plurality of operators, and receives instructions from the user.

信号調整部１２は、音響信号ＳINの信号レベルを調整値Ｇに応じて調整することで音響信号ＳOUTを生成する。例えば、音響信号ＳINに調整値Ｇを乗算する乗算回路（増幅器）が信号調整部１２として好適に採用される。調整値Ｇは、音響信号ＳINの増幅のゲインに相当し、１以下の正数（０＜Ｇ≦１）に設定される。調整制御部１４は、信号調整部１２の処理に適用される調整値Ｇを音響信号ＳINの特性に応じて可変に設定する。なお、調整値Ｇの範囲は１以下の正数に限定されない。例えば、調整値Ｇが１以上の数値に設定される構成によれば、音響処理装置１００Aをエキスパンダーとして機能させることが可能である。また、調整値Ｇを１以上の数値に設定することで音響信号ＳOUTの信号レベルが所定の上限値を上回る場合には、音響信号ＳOUTの信号レベルを抑制する処理（例えばハードクリップやソフトクリップ等の公知の方法）が併用され得る。   The signal adjustment unit 12 generates the acoustic signal SOUT by adjusting the signal level of the acoustic signal SIN according to the adjustment value G. For example, a multiplication circuit (amplifier) that multiplies the acoustic signal SIN by the adjustment value G is suitably employed as the signal adjustment unit 12. The adjustment value G corresponds to the amplification gain of the acoustic signal SIN, and is set to a positive number of 1 or less (0 <G ≦ 1). The adjustment control unit 14 variably sets the adjustment value G applied to the processing of the signal adjustment unit 12 according to the characteristics of the acoustic signal SIN. The range of the adjustment value G is not limited to a positive number of 1 or less. For example, according to the configuration in which the adjustment value G is set to a numerical value of 1 or more, the sound processing device 100A can function as an expander. In addition, when the signal level of the acoustic signal SOUT exceeds a predetermined upper limit value by setting the adjustment value G to a numerical value of 1 or more, processing for suppressing the signal level of the acoustic signal SOUT (for example, hard clip or soft clip) Can be used in combination.

図１に示すように、調整制御部１４は、帯域分割部２２と候補値生成部２４と調整値選択部２６とを含んで構成される。帯域分割部２２は、周波数帯域が相違するＮ個の帯域成分Ｂ[1]〜Ｂ[N]に音響信号ＳINを帯域分割する（Ｎは２以上の自然数）。例えばＩＩＲ（Infinite Impulse Response）フィルタやＦＩＲ（Finite Impulse Response）フィルタ等の公知のフィルタ回路が帯域分割部２２として任意に採用される。   As shown in FIG. 1, the adjustment control unit 14 includes a band dividing unit 22, a candidate value generating unit 24, and an adjustment value selecting unit 26. The band dividing unit 22 divides the acoustic signal SIN into N band components B [1] to B [N] having different frequency bands (N is a natural number of 2 or more). For example, a known filter circuit such as an IIR (Infinite Impulse Response) filter or an FIR (Finite Impulse Response) filter is arbitrarily employed as the band dividing unit 22.

候補値生成部２４は、信号調整部１２に適用される調整値Ｇの候補となるＮ個の調整値Ｃ[1]〜Ｃ[N]を可変に設定する。図１に示すように、候補値生成部２４は、相異なる帯域成分Ｂ[1]〜Ｂ[N]に対応するＮ個の調整値設定部３０[1]〜３０[N]で構成される。第ｎ番目（ｎ＝１〜Ｎ）の調整値設定部３０[n]は、帯域分割部２２が生成した帯域成分Ｂ[n]の信号レベルＬ[n]に応じて調整値Ｃ[n]を可変に設定する。   The candidate value generation unit 24 variably sets N adjustment values C [1] to C [N] that are candidates for the adjustment value G applied to the signal adjustment unit 12. As shown in FIG. 1, the candidate value generation unit 24 includes N adjustment value setting units 30 [1] to 30 [N] corresponding to different band components B [1] to B [N]. . The nth (n = 1 to N) adjustment value setting unit 30 [n] adjusts the adjustment value C [n] according to the signal level L [n] of the band component B [n] generated by the band dividing unit 22. Is set to be variable.

図１に示すように、各調整値設定部３０[n]は、信号レベル検出部４２と設定処理部４４とを含んで構成される。信号レベル検出部４２は、帯域成分Ｂ[n]の信号レベルＬ[n]を検出する。帯域成分Ｂ[n]の信号レベルＬ[n]の検出には公知の技術が任意に採用され得る。   As shown in FIG. 1, each adjustment value setting unit 30 [n] includes a signal level detection unit 42 and a setting processing unit 44. The signal level detection unit 42 detects the signal level L [n] of the band component B [n]. A known technique can be arbitrarily employed for detecting the signal level L [n] of the band component B [n].

設定処理部４４は、信号レベル検出部４２が検出した信号レベルＬ[n]に応じて調整値Ｃ[n]を可変に設定する。具体的には、設定処理部４４は、当該設定処理部４４が設定した調整値Ｃ[n]を調整値Ｇとして信号調整部１２に適用した場合に、帯域成分Ｂ[n]の信号レベルＬ[n]が増加するほど音響信号ＳINに対する音響信号ＳOUTの信号レベルが抑制されるように、帯域成分Ｂ[n]の信号レベルＬ[n]に応じて調整値Ｃ[n]を可変に設定する。   The setting processing unit 44 variably sets the adjustment value C [n] according to the signal level L [n] detected by the signal level detection unit 42. Specifically, the setting processing unit 44 applies the signal level L of the band component B [n] when the adjustment value C [n] set by the setting processing unit 44 is applied to the signal adjustment unit 12 as the adjustment value G. The adjustment value C [n] is variably set according to the signal level L [n] of the band component B [n] so that the signal level of the acoustic signal SOUT with respect to the acoustic signal SIN is suppressed as [n] increases. To do.

例えば、設定処理部４４は、帯域成分Ｂ[n]の信号レベルＬ[n]が閾値ＬTHを下回る状態では調整値Ｃ[n]を１に設定し、信号レベルＬ[n]が閾値ＬTHを上回る状態がアタック時間Ｔatkだけ継続すると、信号レベルＬ[n]が増加するほど調整値Ｃ[n]が圧縮率（レシオ）Ｒに応じた度合で減少する（すなわち音響信号ＳOUTの信号レベルが音響信号ＳINに対して抑制される）ように調整値Ｃ[n]を制御する。また、設定処理部４４は、帯域成分Ｂ[n]の信号レベルＬ[n]が閾値ＬTHを下回る状態がリリース時間Ｔrelだけ継続すると、信号レベルＬ[n]に応じた調整値Ｃ[n]の制御を停止して調整値Ｃ[n]を１に設定する。調整値Ｃ[n]の制御に関連する変数（閾値ＬTH，圧縮率Ｒ，アタック時間Ｔatk，リリース時間Ｔrel）の各数値は、指示受付部１６に対する利用者からの指示に応じて可変に設定される。   For example, the setting processing unit 44 sets the adjustment value C [n] to 1 when the signal level L [n] of the band component B [n] is lower than the threshold value LTH, and the signal level L [n] sets the threshold value LTH. When the state of exceeding is continued for the attack time Tatk, the adjustment value C [n] decreases to a degree corresponding to the compression ratio (ratio) R as the signal level L [n] increases (that is, the signal level of the acoustic signal SOUT is acoustic). The adjustment value C [n] is controlled so as to be suppressed with respect to the signal SIN. Further, when the state in which the signal level L [n] of the band component B [n] is lower than the threshold value LTH continues for the release time Trel, the setting processing unit 44 adjusts the adjustment value C [n] corresponding to the signal level L [n]. And the adjustment value C [n] is set to 1. The numerical values of the variables (threshold value LTH, compression rate R, attack time Tatk, release time Trel) related to the control of the adjustment value C [n] are variably set according to an instruction from the user to the instruction receiving unit 16. The

図１の調整値選択部２６は、候補値生成部２４（調整値設定部３０[1]〜３０[N]）が生成するＮ個の調整値Ｃ[1]〜Ｃ[N]の何れかを、信号調整部１２に適用される調整値Ｇとして選択する。利用者は、Ｎ個の調整値Ｃ[1]〜Ｃ[N]のうち所望の調整値Ｃ[n]（Ｎ個の帯域成分Ｂ[1]〜Ｂ[N]のうち所望の帯域成分Ｂ[n]）の選択の指示を指示受付部１６に対して付与することが可能である。調整値選択部２６は、Ｎ個の調整値Ｃ[1]〜Ｃ[N]のうち指示受付部１６に対する指示で利用者が選択した調整値Ｃ[n]を調整値Ｇとして選択する。調整値選択部２６が選択した調整値Ｇが信号調整部１２に指示された音響信号ＳOUTの生成（音響信号ＳINに対する調整値Ｇの乗算）に適用される。   The adjustment value selection unit 26 in FIG. 1 is one of N adjustment values C [1] to C [N] generated by the candidate value generation unit 24 (adjustment value setting units 30 [1] to 30 [N]). Is selected as the adjustment value G applied to the signal adjustment unit 12. The user selects a desired adjustment value C [n] among N adjustment values C [1] to C [N] (a desired band component B out of N band components B [1] to B [N]). [n]) can be given to the instruction receiving unit 16. The adjustment value selection unit 26 selects, as the adjustment value G, the adjustment value C [n] selected by the user in response to the instruction to the instruction receiving unit 16 among the N adjustment values C [1] to C [N]. The adjustment value G selected by the adjustment value selection unit 26 is applied to the generation of the acoustic signal SOUT instructed by the signal adjustment unit 12 (multiplication of the adjustment value G by the acoustic signal SIN).

以上の形態においては、各帯域成分Ｂ[n]に対応するＮ個の調整値Ｃ[1]〜Ｃ[N]の何れかが信号調整部１２での調整値Ｇとして選択される。したがって、音響信号ＳINのＮ個の帯域成分Ｂ[1]〜Ｂ[N]のうち特定の帯域成分Ｂ[n]の信号レベルＬ[n]のみが選択的に音響信号ＳOUTの信号レベルに反映される。第１実施形態では、Ｎ個の調整値Ｃ[1]〜Ｃ[N]のうち利用者からの指示に応じた調整値Ｃ[n]が調整値Ｇとして選択されるから、利用者の所望の帯域成分Ｂ[n]のみが音響信号ＳOUTの信号レベルに反映されるという利点がある。   In the above embodiment, any one of the N adjustment values C [1] to C [N] corresponding to each band component B [n] is selected as the adjustment value G in the signal adjustment unit 12. Therefore, only the signal level L [n] of the specific band component B [n] among the N band components B [1] to B [N] of the acoustic signal SIN is selectively reflected in the signal level of the acoustic signal SOUT. Is done. In the first embodiment, the adjustment value C [n] corresponding to the instruction from the user is selected as the adjustment value G among the N adjustment values C [1] to C [N]. There is an advantage that only the band component B [n] is reflected in the signal level of the acoustic signal SOUT.

例えば、帯域成分Ｂ[n1]内の歌唱音と帯域成分Ｂ[n2]内の楽器の演奏音とを音響信号ＳINが含む場合を想定する。帯域成分Ｂ[n1]の調整値Ｃ[n1]を利用者が選択した場合、歌唱音（帯域成分Ｂ[n1]）の信号レベルＬ[n1]が閾値ＬTHを下回るならば、演奏音（帯域成分Ｂ[n2]）の信号レベルＬ[n2]が閾値ＬTHを上回る場合でも音響信号ＳOUTの信号レベルは抑制されない。したがって、利用者は楽器の演奏音を明確に聴取することが可能である。他方、歌唱音の信号レベルＬ[n1]が閾値ＬTHを上回る場合には音響信号ＳOUTの信号レベルが抑制される。すなわち、歌唱音の音量の過度の増加を抑制しながら楽器の演奏音を歌唱音と比較して優先的に聴取したいという利用者の要求に対応することが可能である。   For example, it is assumed that the acoustic signal SIN includes the singing sound in the band component B [n1] and the performance sound of the musical instrument in the band component B [n2]. When the user selects the adjustment value C [n1] of the band component B [n1], if the signal level L [n1] of the singing sound (band component B [n1]) is below the threshold LTH, the performance sound (band Even when the signal level L [n2] of the component B [n2]) exceeds the threshold value LTH, the signal level of the acoustic signal SOUT is not suppressed. Therefore, the user can clearly hear the performance sound of the musical instrument. On the other hand, when the signal level L [n1] of the singing sound exceeds the threshold value LTH, the signal level of the acoustic signal SOUT is suppressed. That is, it is possible to respond to a user's request to preferentially listen to the performance sound of the musical instrument compared to the singing sound while suppressing an excessive increase in the volume of the singing sound.

＜Ｂ：第２実施形態＞
本発明の第２実施形態を以下に説明する。なお、以下に例示する各態様において作用や機能が第１実施形態と同等である要素については、以上の説明で参照した符号を流用して各々の詳細な説明を適宜に省略する。 <B: Second Embodiment>
A second embodiment of the present invention will be described below. In addition, about the element which an effect | action and a function are equivalent to 1st Embodiment in each aspect illustrated below, each reference detailed in the above description is diverted and each detailed description is abbreviate | omitted suitably.

第２実施形態の音響処理装置１００Cの構成は、図１に例示した第１実施形態の音響処理装置１００Aと同様である。第１実施形態の調整値選択部２６は、利用者からの指示に応じた調整値Ｃ[n]を調整値Ｇとして選択した。第２実施形態の調整値選択部２６は、Ｎ個の帯域成分Ｂ[1]〜Ｂ[N]のうち信号レベル検出部４２にて検出される信号レベルＬ[n]が最大の帯域成分Ｂ[n]に対応する１個の調整値Ｃ[n]を調整値Ｇとして選択する。  The configuration of the acoustic processing apparatus 100C of the second embodiment is the same as that of the acoustic processing apparatus 100A of the first embodiment illustrated in FIG. The adjustment value selection unit 26 of the first embodiment selects the adjustment value C [n] corresponding to the instruction from the user as the adjustment value G. The adjustment value selection unit 26 of the second embodiment includes a band component B having a maximum signal level L [n] detected by the signal level detection unit 42 among the N band components B [1] to B [N]. One adjustment value C [n] corresponding to [n] is selected as the adjustment value G.

第２実施形態においても、第１実施形態と同様に、特定の帯域成分Ｂ[n]の信号レベルＬ[n]のみが選択的に音響信号ＳOUTの信号レベルに反映されるという利点がある。また、第２実施形態では、信号レベルＬ[n]が最大となる帯域成分Ｂ[n]に対応する調整値Ｃ[n]が調整値Ｇとして選択されるから、音響信号ＳINのうち信号レベルＬ[n]が最大となる帯域成分Ｂ[n]以外の成分の信号レベルが充分に低い場合でも、音響信号ＳOUTの信号レベルを適切に抑制することが可能である。  Similarly to the first embodiment, the second embodiment has an advantage that only the signal level L [n] of the specific band component B [n] is selectively reflected in the signal level of the acoustic signal SOUT. In the second embodiment, since the adjustment value C [n] corresponding to the band component B [n] at which the signal level L [n] is maximum is selected as the adjustment value G, the signal level of the acoustic signal SIN is selected. Even when the signal level of components other than the band component B [n] where L [n] is maximum is sufficiently low, the signal level of the acoustic signal SOUT can be appropriately suppressed.

＜Ｃ：第３実施形態＞<C: Third Embodiment>
図２は、第３実施形態の音響処理装置１００Bのブロック図である。図２に示すように、第３実施形態の音響処理装置１００Bは、第２実施形態の音響処理装置１００Cの調整制御部１４に帯域成分調整部５０を追加した構成である。帯域成分調整部５０は、Ｎ個の帯域成分Ｂ[1]〜Ｂ[N]の各々の信号レベルを個別に調整する。  FIG. 2 is a block diagram of the sound processing apparatus 100B of the third embodiment. As shown in FIG. 2, the sound processing device 100B of the third embodiment has a configuration in which a band component adjustment unit 50 is added to the adjustment control unit 14 of the sound processing device 100C of the second embodiment. The band component adjustment unit 50 individually adjusts the signal level of each of the N band components B [1] to B [N].

図２に示すように、帯域成分調整部５０は、相異なる帯域成分Ｂ[n]に対応するＮ個の調整部５２[1]〜５２[N]を含んで構成される。調整部５２[n]は、帯域分割部２２が生成した帯域成分Ｂ[n]に調整値ａ[n]を乗算する乗算回路（増幅器）である。調整値ａ[1]〜ａ[N]は、例えば指示受付部１６に対する利用者からの指示に応じて可変に設定される。調整部５２[n]による調整後（調整値ａ[n]の乗算後）の帯域成分Ｂ[n]が調整値設定部３０[n]に供給される。  As shown in FIG. 2, the band component adjustment unit 50 includes N adjustment units 52 [1] to 52 [N] corresponding to different band components B [n]. The adjustment unit 52 [n] is a multiplication circuit (amplifier) that multiplies the band component B [n] generated by the band division unit 22 by the adjustment value a [n]. The adjustment values a [1] to a [N] are variably set according to an instruction from the user to the instruction receiving unit 16, for example. Band component B [n] after adjustment by adjustment unit 52 [n] (after multiplication of adjustment value a [n]) is supplied to adjustment value setting unit 30 [n].

第３実施形態においても第１実施形態と同様の効果が実現される。また、第３実施形態では、各帯域成分Ｂ[n]の信号レベルＬ[n]が帯域成分調整部５０にて個別に調整されるから、Ｎ個の調整値Ｃ[1]〜Ｃ[N]の各々が調整値Ｇとして選択される可能性を帯域成分Ｂ[n]毎に個別に制御できるという利点がある。例えば、帯域成分調整部５０の調整部５２[n]に適用される調整値ａ[n]を増加させた場合には調整値Ｃ[n]が調整値Ｇとして選択される可能性が増加する。以上の例示では、各調整値ａ[n]が利用者からの指示に応じて可変に設定されるから、利用者の所望の帯域成分Ｂ[n]の信号レベルＬ[n]を音響信号ＳOUTの信号レベル（調整値Ｇ）に優先的に反映させることが可能である。  In the third embodiment, the same effect as in the first embodiment is realized. In the third embodiment, since the signal level L [n] of each band component B [n] is individually adjusted by the band component adjustment unit 50, N adjustment values C [1] to C [N [ ] Can be individually controlled for each band component B [n]. For example, when the adjustment value a [n] applied to the adjustment unit 52 [n] of the band component adjustment unit 50 is increased, the possibility that the adjustment value C [n] is selected as the adjustment value G increases. . In the above example, since each adjustment value a [n] is variably set according to an instruction from the user, the signal level L [n] of the user's desired band component B [n] is set to the acoustic signal SOUT. Can be preferentially reflected in the signal level (adjustment value G).

＜Ｄ：第４実施形態＞
図３は、第４実施形態の音響処理装置１００Dのブロック図である。図３に示すように、第４実施形態の音響処理装置１００Dは、第２実施形態の音響処理装置１００C（図１）に経路制御部６０を追加した構成である。経路制御部６０は、相異なる帯域成分Ｂ[n]に対応するＮ個の切替部６２[1]〜６２[N]を含んで構成される。 <D: Fourth Embodiment>
FIG. 3 is a block diagram of the sound processing apparatus 100D of the fourth embodiment. As shown in FIG. 3, the sound processing apparatus 100D of the fourth embodiment has a configuration in which a path control unit 60 is added to the sound processing apparatus 100C (FIG. 1) of the second embodiment. The path control unit 60 includes N switching units 62 [1] to 62 [N] corresponding to different band components B [n].

経路制御部６０を構成する第ｎ番目の切替部６２[n]は、帯域分割部２２から各調整値設定部３０[n]を介して調整値選択部２６に至るＮ個の経路のうち帯域成分Ｂ[n]に対応する第ｎ番目の経路の確立／遮断を制御する。図３の切替部６２[n]は、調整値設定部３０[n]内の信号レベル検出部４２と設定処理部４４との間に介在して両者間の接続を制御するスイッチである。Ｎ個の切替部６２[1]〜６２[N]の各々の状態（オン／オフ）は、指示受付部１６に対する利用者からの指示に応じて個別に設定される。   The n-th switching unit 62 [n] constituting the path control unit 60 is a band among N paths from the band dividing unit 22 to the adjustment value selection unit 26 via each adjustment value setting unit 30 [n]. Controls establishment / blocking of the nth path corresponding to the component B [n]. The switching unit 62 [n] in FIG. 3 is a switch that is interposed between the signal level detection unit 42 and the setting processing unit 44 in the adjustment value setting unit 30 [n] and controls the connection therebetween. Each state (ON / OFF) of the N switching units 62 [1] to 62 [N] is individually set according to an instruction from the user to the instruction receiving unit 16.

第ｎ番目の切替部６２[n]がオン状態に制御された場合、調整値設定部３０[n]内では信号レベル検出部４２から設定処理部４４に至る経路が確立されるから、第１実施形態と同様に、設定処理部４４は信号レベルＬ[n]に応じた調整値Ｃ[n]を調整値Ｇの候補として生成する。他方、切替部６２[n]がオフ状態に制御された場合、調整値設定部３０[n]内の信号レベル検出部４２から設定処理部４４に至る経路が遮断されるから、設定処理部４４は調整値Ｃ[n]の生成を停止する。したがって、帯域成分Ｂ[n]の信号レベルＬ[n]は、その高低に関わらず、信号調整部１２に適用される調整値Ｇには反映されない。調整値選択部２６は、候補値生成部２４が生成する複数（Ｎ個以下）の調整値Ｃ[n]のうち最大の信号レベルＬ[n]に対応する調整値Ｃ[n]を調整値Ｇとして選択する。   When the n-th switching unit 62 [n] is controlled to be in the ON state, a path from the signal level detection unit 42 to the setting processing unit 44 is established in the adjustment value setting unit 30 [n]. Similar to the embodiment, the setting processing unit 44 generates an adjustment value C [n] corresponding to the signal level L [n] as a candidate for the adjustment value G. On the other hand, when the switching unit 62 [n] is controlled to be in the off state, the path from the signal level detection unit 42 to the setting processing unit 44 in the adjustment value setting unit 30 [n] is blocked. Stops generating the adjustment value C [n]. Therefore, the signal level L [n] of the band component B [n] is not reflected in the adjustment value G applied to the signal adjustment unit 12 regardless of its level. The adjustment value selection unit 26 sets an adjustment value C [n] corresponding to the maximum signal level L [n] among a plurality (N or less) of adjustment values C [n] generated by the candidate value generation unit 24 as an adjustment value. Select as G.

以上の形態においては、各帯域成分Ｂ[n]の信号レベルＬ[n]を音響信号ＳOUTの信号レベル（調整値Ｇ）に反映させるか否かが帯域成分Ｂ[n]毎に個別に制御されるから、特定の帯域成分Ｂ[n]が音響信号ＳOUTの信号レベルに影響することを回避することが可能である。例えば、歌唱音の帯域成分Ｂ[n]に対応する切替部６２[n]をオフ状態に制御すれば、歌唱音の信号レベルＬ[n]が増加した場合でも音響信号ＳOUTの信号レベルの抑制は回避される。   In the above embodiment, whether or not the signal level L [n] of each band component B [n] is reflected in the signal level (adjustment value G) of the acoustic signal SOUT is individually controlled for each band component B [n]. Therefore, it is possible to avoid that the specific band component B [n] affects the signal level of the acoustic signal SOUT. For example, if the switching unit 62 [n] corresponding to the band component B [n] of the singing sound is controlled to be turned off, the signal level of the acoustic signal SOUT is suppressed even when the signal level L [n] of the singing sound increases. Is avoided.

なお、以上の例示では、調整値選択部２６が信号レベルＬ[n]の高低に応じて調整値Ｃ[n]を選択したが、第１実施形態と同様に、利用者からの指示に応じた調整値Ｃ[n]を選択する構成を第４実施形態に適用することも可能である。また、経路制御部６０が設置される位置は適宜に変更される。例えば、帯域分割部２２と各信号レベル検出部４２との間に経路制御部６０（切替部６２[1]〜６２[N]）を設置した構成や、各設定処理部４４と調整値選択部２６との間に経路制御部６０（切替部６２[1]〜６２[N]）を設置した構成も採用され得る。 In the above example, the adjustment value selection unit 26 selects the adjustment value C [n] according to the level of the signal level L [n]. However, as in the first embodiment , the adjustment value selection unit 26 responds to an instruction from the user. The configuration for selecting the adjustment value C [n] can also be applied to the fourth embodiment. In addition, the position where the route control unit 60 is installed is changed as appropriate. For example, a configuration in which a path control unit 60 (switching units 62 [1] to 62 [N]) is installed between the band dividing unit 22 and each signal level detecting unit 42, each setting processing unit 44, and an adjustment value selecting unit. 26, a configuration in which a path control unit 60 (switching units 62 [1] to 62 [N]) is installed may be employed.

＜Ｅ：第５実施形態＞
図４は、第５実施形態の音響処理装置１００Eのブロック図である。調整制御部１４が時間領域の音響信号ＳINを処理する以上の各形態とは相違して、第５実施形態では、調整制御部１４が音響信号ＳINを周波数領域で処理する。図４に示すように、第５実施形態の音響処理装置１００Eは、第１実施形態の音響処理装置１００Aに周波数変換部７２と信号遅延部７４とを追加した構成である。 <E: Fifth Embodiment>
FIG. 4 is a block diagram of a sound processing apparatus 100E according to the fifth embodiment. Unlike the above embodiments in which the adjustment control unit 14 processes the time domain acoustic signal SIN, in the fifth embodiment, the adjustment control unit 14 processes the acoustic signal SIN in the frequency domain. As shown in FIG. 4, the sound processing device 100E of the fifth embodiment has a configuration in which a frequency conversion unit 72 and a signal delay unit 74 are added to the sound processing device 100A of the first embodiment.

周波数変換部７２は、音響信号ＳINの各フレームに対する周波数変換で音響信号ＳINの周波数スペクトルをフレーム毎に生成する。周波数変換部７２による演算には、離散フーリエ変換やウェーブレット変換等の公知の周波数変換が任意に採用される。帯域分割部２２は、周波数変換部７２が生成した周波数スペクトルの分割でＮ個の帯域成分Ｂ[1]〜Ｂ[N]を生成する。他方、図４の信号遅延部７４は、周波数変換部７２での処理に必要な時間だけ音響信号ＳINを遅延させる。信号遅延部７４での遅延後の音響信号ＳINが信号調整部１２に供給される。   The frequency conversion unit 72 generates a frequency spectrum of the acoustic signal SIN for each frame by frequency conversion for each frame of the acoustic signal SIN. For the calculation by the frequency conversion unit 72, known frequency conversion such as discrete Fourier transform and wavelet transform is arbitrarily adopted. The band dividing unit 22 generates N band components B [1] to B [N] by dividing the frequency spectrum generated by the frequency converting unit 72. On the other hand, the signal delay unit 74 in FIG. 4 delays the acoustic signal SIN by a time required for the processing in the frequency conversion unit 72. The acoustic signal SIN delayed by the signal delay unit 74 is supplied to the signal adjustment unit 12.

以上の構成においても第１実施形態と同様の効果が実現される。また、第５実施形態では、信号遅延部７４での遅延後の音響信号ＳINが信号調整部１２に供給されるから、音響信号ＳINのうち調整値Ｇの生成に適用された区間（フレーム）と当該調整値Ｇが信号調整部１２にて適用される区間との時間軸上のズレが低減されるという利点がある。ただし、信号遅延部７４は省略され得る。   Even in the above configuration, the same effect as in the first embodiment is realized. In the fifth embodiment, since the acoustic signal SIN delayed by the signal delay unit 74 is supplied to the signal adjustment unit 12, the section (frame) applied to the generation of the adjustment value G in the acoustic signal SIN There is an advantage that the deviation on the time axis from the section in which the adjustment value G is applied by the signal adjustment unit 12 is reduced. However, the signal delay unit 74 may be omitted.

＜Ｆ：第６実施形態＞
本発明の第６実施形態を説明する。以上の各形態では、音響信号ＳINに応じた調整値Ｇを音響信号ＳINに適用して音響信号ＳOUTを生成するフィードフォワード型の構成を例示した。第６実施形態は、音響信号ＳOUTに応じて調整値Ｇを設定したうえで音響信号ＳINの信号レベルの調整に適用するフィードバック型である。 <F: Sixth Embodiment>
A sixth embodiment of the present invention will be described. In each of the above embodiments, the feedforward type configuration in which the adjustment value G corresponding to the acoustic signal SIN is applied to the acoustic signal SIN to generate the acoustic signal SOUT is exemplified. The sixth embodiment is a feedback type that is applied to the adjustment of the signal level of the acoustic signal SIN after setting the adjustment value G according to the acoustic signal SOUT.

図５は、第６実施形態の音響処理装置１００Fのブロック図である。図５に示すように、第６実施形態の帯域分割部２２は、信号調整部１２による調整後の音響信号ＳOUTの帯域分割でＮ個の帯域成分Ｂ[1]〜Ｂ[N]を生成する。候補値生成部２４は、第１実施形態と同様の構成および処理で各帯域成分Ｂ[n]に対応するＮ個の調整値Ｃ[1]〜Ｃ[N]を生成する。調整値選択部２６は、Ｎ個の調整値Ｃ[1]〜Ｃ[N]の何れかを調整値Ｇとして選択する。信号調整部１２は、調整値選択部２６が選択した調整値Ｇに応じて音響信号ＳINの信号レベルを調整することで音響信号ＳOUTを生成する。   FIG. 5 is a block diagram of a sound processing apparatus 100F according to the sixth embodiment. As shown in FIG. 5, the band dividing unit 22 of the sixth embodiment generates N band components B [1] to B [N] by band division of the acoustic signal SOUT after adjustment by the signal adjusting unit 12. . The candidate value generation unit 24 generates N adjustment values C [1] to C [N] corresponding to each band component B [n] with the same configuration and processing as in the first embodiment. The adjustment value selection unit 26 selects any one of the N adjustment values C [1] to C [N] as the adjustment value G. The signal adjustment unit 12 generates the acoustic signal SOUT by adjusting the signal level of the acoustic signal SIN according to the adjustment value G selected by the adjustment value selection unit 26.

第６実施形態においても第１実施形態と同様の効果が実現される。なお、図５では第１実施形態を基礎とした構成を例示したが、音響信号ＳOUTに応じて調整値Ｇを設定する第６実施形態のフィードバック型の構成は、第２実施形態から第５実施形態にも同様に適用され得る。   In the sixth embodiment, the same effect as in the first embodiment is realized. 5 illustrates the configuration based on the first embodiment, but the feedback-type configuration of the sixth embodiment that sets the adjustment value G according to the acoustic signal SOUT is the second to fifth embodiments. The form can be applied as well.

＜Ｇ：変形例＞
以上の各形態は多様に変形され得る。具体的な変形の態様を以下に例示する。以下の例示から任意に選択された２以上の態様は適宜に併合され得る。 <G: Modification>
Each of the above forms can be variously modified. Specific modifications are exemplified below. Two or more aspects arbitrarily selected from the following examples can be appropriately combined.

（１）変形例１
以上の各形態における各調整値設定部３０[n]の構成は適宜に変更される。例えば図６の調整値設定部３０A[n]や図７の調整値設定部３０B[n]を、以上の各形態における調整値設定部３０[n]に置換することが可能である。 (1) Modification 1
The configuration of each adjustment value setting unit 30 [n] in each of the above embodiments is changed as appropriate. For example, the adjustment value setting unit 30A [n] in FIG. 6 and the adjustment value setting unit 30B [n] in FIG. 7 can be replaced with the adjustment value setting unit 30 [n] in the above embodiments.

図６の調整値設定部３０A[n]は、対数変換部８２と対数逆変換部８４とを以上の各形態の調整値設定部３０[n]に追加した構成である。対数変換部８２は、帯域分割部２２が生成した帯域成分Ｂ[n]を対数領域の数値（デシベル値）に変換（Linear-Logarithm変換）する。対数変換部８２による変換後の帯域成分Ｂ[n]から信号レベル検出部４２が信号レベルＬ[n]を検出し、設定処理部４４が信号レベルＬ[n]から調整値Ｃ[n]を設定する。対数逆変換部８４は、設定処理部４４が設定した調整値Ｃ[n]を線形領域の数値に変換（Logarithm-Linear変換）する。対数逆変換部８４による変換後の調整値Ｃ[n]が調整値Ｇの候補として調整値選択部２６に供給される。なお、設定処理部４４による演算の内容が対数逆変換部８４の作用を包含する場合には対数逆変換部８４が省略され得る。   The adjustment value setting unit 30A [n] in FIG. 6 has a configuration in which a logarithmic conversion unit 82 and a logarithmic inverse conversion unit 84 are added to the adjustment value setting unit 30 [n] in each of the above forms. The logarithmic conversion unit 82 converts the band component B [n] generated by the band dividing unit 22 into a numerical value (decibel value) in the logarithmic region (Linear-Logarithm conversion). The signal level detector 42 detects the signal level L [n] from the band component B [n] converted by the logarithmic converter 82, and the setting processor 44 calculates the adjustment value C [n] from the signal level L [n]. Set. The logarithmic inverse conversion unit 84 converts the adjustment value C [n] set by the setting processing unit 44 into a numerical value in the linear region (Logarithm-Linear conversion). The adjustment value C [n] after conversion by the logarithmic inverse conversion unit 84 is supplied to the adjustment value selection unit 26 as a candidate for the adjustment value G. In addition, when the content of the calculation by the setting processing unit 44 includes the operation of the logarithmic inverse conversion unit 84, the logarithmic inverse conversion unit 84 may be omitted.

図７の調整値設定部３０B[n]は、乗算部８６を以上の各形態の調整値設定部３０[n]に追加した構成である。乗算部８６は、帯域分割部２２が生成した帯域成分Ｂ[n]に閾値ＬTHの逆数（１/ＬTH）を乗算する。閾値ＬTHは、前述の各形態と同様に、指示受付部１６に対する利用者からの指示に応じて可変に設定される。閾値ＬTHが小さい数値に設定されるほど、乗算部８６の演算後の帯域成分Ｂ[n]の信号レベルＬ[n]が増加するから、音響信号ＳOUTを抑圧するように調整値Ｃ[n]が設定される。   The adjustment value setting unit 30B [n] in FIG. 7 has a configuration in which a multiplication unit 86 is added to the adjustment value setting unit 30 [n] of each of the above forms. The multiplying unit 86 multiplies the band component B [n] generated by the band dividing unit 22 by the reciprocal (1 / LTH) of the threshold value LTH. The threshold value LTH is variably set according to an instruction from the user to the instruction receiving unit 16 as in the above-described embodiments. As the threshold value LTH is set to a smaller value, the signal level L [n] of the band component B [n] after the calculation by the multiplier 86 increases, so the adjustment value C [n] so as to suppress the acoustic signal SOUT. Is set.

例えば、設定処理部４４が以下の数式の演算で帯域成分Ｂ[n]の信号レベルＬ[n]から調整値Ｃ[n]を算定する場合を想定する。記号Ｒは前述のように圧縮比（レシオ）を意味する。

Figure 0005621519
For example, it is assumed that the setting processing unit 44 calculates the adjustment value C [n] from the signal level L [n] of the band component B [n] by the calculation of the following mathematical formula. The symbol R means the compression ratio (ratio) as described above.
Figure 0005621519

いま、閾値ＬTHが0.5に設定されるとともに圧縮率Ｒが2.0に設定された状態のもとで、信号レベルが1.0の帯域成分Ｂ[n]が図７の調整値設定部３０B[n]に供給された場合を想定する。閾値ＬTHの逆数（1/0.5＝2.0）を乗算部８６が帯域成分Ｂ[n]に乗算することで、信号レベル検出部４２が検出する信号レベルＬ[n]は2.0（＝1.0×2.0）となる。したがって、設定処理部４４が算定する調整値Ｃ[n]は0.7071（＝2.0-1/2）となる。なお、乗算部８６を省略した構成では、信号レベル検出部４２が検出する信号レベルＬ[n]が1.0であるから、設定処理部４４が算定する調整値Ｃ[n]は1.0となる。すなわち、帯域成分Ｂ[n]に対する閾値ＬTHの逆数の乗算は、音響信号ＳOUTの信号レベルを抑圧させるように作用する。 Now, with the threshold LTH set to 0.5 and the compression ratio R set to 2.0, the band component B [n] having a signal level of 1.0 is transferred to the adjustment value setting unit 30B [n] in FIG. Assume that it is supplied. The signal level L [n] detected by the signal level detection unit 42 is 2.0 (= 1.0 × 2.0) by the multiplication unit 86 multiplying the band component B [n] by the reciprocal of the threshold value LTH (1 / 0.5 = 2.0). It becomes. Therefore, the adjustment value C [n] calculated by the setting processing unit 44 is 0.7071 (= 2.0 −1/2 ). In the configuration in which the multiplication unit 86 is omitted, since the signal level L [n] detected by the signal level detection unit 42 is 1.0, the adjustment value C [n] calculated by the setting processing unit 44 is 1.0. That is, multiplication of the band component B [n] by the reciprocal of the threshold value LTH acts to suppress the signal level of the acoustic signal SOUT.

（２）変形例２
図８に示すように、音響信号ＳINの信号レベルを調整する調整部１８２や音響信号ＳOUTの信号レベルを調整する調整部１８４を追加した構成も好適である。調整部１８２および調整部１８４の各々は、例えば指示受付部１６に対する利用者からの指示に応じた数値を入力信号（ＳIN，ＳOUT）に乗算する。なお、図８ではフィードフォワード型の構成を例示したが、第６実施形態として例示したフィードバック型の構成にも調整部１８２および調整部１８４が追加され得る。 (2) Modification 2
As shown in FIG. 8, a configuration in which an adjusting unit 182 that adjusts the signal level of the acoustic signal SIN and an adjusting unit 184 that adjusts the signal level of the acoustic signal SOUT is also suitable. Each of the adjusting unit 182 and the adjusting unit 184 multiplies the input signal (SIN, SOUT) by a numerical value corresponding to an instruction from the user to the instruction receiving unit 16, for example. 8 illustrates the feed-forward configuration, but the adjustment unit 182 and the adjustment unit 184 may be added to the feedback configuration illustrated as the sixth embodiment.

（３）変形例３
以上の形態では、Ｎ個の調整値Ｃ[1]〜Ｃ[N]から１個の調整値Ｃ[n]を調整値Ｇとして選択したが、調整値選択部２６がＮ個の調整値Ｃ[1]〜Ｃ[N]から複数個（Ｎ個未満）の調整値Ｃ[n]を選択して調整値Ｇを決定する構成も採用され得る。例えば、調整値選択部２６は、利用者からの指示や信号レベルＬ[n]の高低に応じて選択した複数の調整値Ｃ[n]について所定の演算を実行することで調整値Ｇを算定する。 (3) Modification 3
In the above embodiment, one adjustment value C [n] is selected as the adjustment value G from the N adjustment values C [1] to C [N], but the adjustment value selection unit 26 uses the N adjustment values C. A configuration in which the adjustment value G is determined by selecting a plurality (less than N) of adjustment values C [n] from [1] to C [N] can also be employed. For example, the adjustment value selection unit 26 calculates the adjustment value G by executing a predetermined calculation for a plurality of adjustment values C [n] selected according to the instruction from the user and the level of the signal level L [n]. To do.

１００A，１００B，１００C，１００D，１００E，１００F……音響処理装置、１２……信号調整部、１４……調整制御部、１６……指示受付部、２２……帯域分割部、２４……候補値生成部、２６……調整値選択部、３０[n]，３０A[n]，３０B[n]……調整値設定部、４２……信号レベル検出部、４４……設定処理部、５０……帯域成分調整部、５２[n]……調整部、６０……経路制御部、６２[n]……切替部、７２……周波数変換部、７４……信号遅延部、８２……対数変換部、８４……対数逆変換部、８６……調整部。
100A, 100B, 100C, 100D, 100E, 100F... Acoustic processing device, 12... Signal adjustment unit, 14... Adjustment control unit, 16. Generation unit, 26... Adjustment value selection unit, 30 [n], 30A [n], 30B [n]... Adjustment value setting unit, 42... Signal level detection unit, 44. Band component adjustment unit, 52 [n] ... adjustment unit, 60 ... path control unit, 62 [n] ... switching unit, 72 ... frequency conversion unit, 74 ... signal delay unit, 82 ... logarithmic conversion unit , 84... Logarithmic inverse conversion unit, 86... Adjustment unit.

Claims (5)

入力音響信号の信号レベルを調整値に応じて調整して出力音響信号を生成する信号調整手段と、
前記入力音響信号または前記出力音響信号を複数の帯域成分に分割する帯域分割手段と、
前記各帯域成分に対応する複数の調整値設定手段であって、前記入力音響信号に対する前記出力音響信号の信号レベルが当該帯域成分の信号レベルに応じて変化するように各々が調整値を可変に設定する複数の調整値設定手段と、
前記複数の調整値設定手段が設定した複数の調整値のうち前記信号調整手段に適用される調整値を選択する調整値選択手段と
を具備する音響処理装置。 Signal adjusting means for adjusting the signal level of the input acoustic signal according to the adjustment value and generating an output acoustic signal;
Band dividing means for dividing the input acoustic signal or the output acoustic signal into a plurality of band components;
A plurality of adjustment value setting means corresponding to each of the band components, each of which adjusts the adjustment value so that the signal level of the output acoustic signal with respect to the input acoustic signal changes according to the signal level of the band component; A plurality of adjustment value setting means to be set;
An acoustic processing apparatus comprising: an adjustment value selection unit that selects an adjustment value applied to the signal adjustment unit among the plurality of adjustment values set by the plurality of adjustment value setting units. 前記調整値選択手段は、利用者からの指示に応じて調整値を選択する
請求項１の音響処理装置。 The sound processing apparatus according to claim 1, wherein the adjustment value selection unit selects an adjustment value in accordance with an instruction from a user. 前記調整値選択手段は、前記複数の帯域成分のうち信号レベルが最大の帯域成分に対応する調整値を選択する
請求項１または請求項２の音響処理装置。 The sound processing apparatus according to claim 1, wherein the adjustment value selection unit selects an adjustment value corresponding to a band component having a maximum signal level among the plurality of band components. 前記各帯域成分の信号レベルを帯域成分毎に個別に調整して前記各調整値設定手段に供給する帯域成分調整手段
を具備する請求項３の音響処理装置。 The sound processing apparatus according to claim 3, further comprising: a band component adjusting unit that individually adjusts the signal level of each band component for each band component and supplies the adjusted signal level to each adjustment value setting unit. 前記帯域分割手段から前記各調整値設定手段を介して前記調整値選択手段に至る複数の経路の各々の確立および遮断を個別に制御する経路制御手段
を具備する請求項１から請求項４の何れかの音響処理装置。 5. A path control unit that individually controls establishment and blocking of each of a plurality of paths from the band dividing unit to the adjustment value selection unit via the adjustment value setting unit. Sound processing device.
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