JPH05191885A - Acoustic signal equalizer circuit - Google Patents

Acoustic signal equalizer circuit

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Publication number
JPH05191885A
JPH05191885A JP2202692A JP2202692A JPH05191885A JP H05191885 A JPH05191885 A JP H05191885A JP 2202692 A JP2202692 A JP 2202692A JP 2202692 A JP2202692 A JP 2202692A JP H05191885 A JPH05191885 A JP H05191885A
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signal
amplitude
frequency component
means
frequency
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JP2202692A
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Japanese (ja)
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Haruo Sakata
晴夫 坂田
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Clarion Co Ltd
クラリオン株式会社
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Abstract

PURPOSE:To reproduce sound quality rich in auditory sensation by adding a high frequency component in an audible band at the time of reproducing an acoustic signal restricted in the band. CONSTITUTION:Respective high frequency component signals EH1 to EH4 to be outputted from a component wave device 2 are added to envelope detectors 11-1 to 11-4 and square circuits 8-1 to 8-4. Higher harmonic component signals from the square circuits 8-1 to 8-4 are inputted to gain control circuits 10-1 to 10-4 via BPFs 9-1 to 9-4. Respective amplitude modulation signals which was modulated in amplitude by amplitude detection signals from the envelope detectors 11-1 to 11-4 and controlled in gain via attenuators 14-1 to 14-4 are fed to an addition circuits 11. The addition circuit 11 synthsizes the respective amplitude modulation signals with a low frequency component signal from the component wave device 2 and feds the synthesized signal to a switch 15.

Description

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

【0001】 [0001]

【産業上の利用分野】本発明は帯域制限されたオーディオ信号の再生に際して聴感に対して豊かな音の再現を可能とするための音響信号イコライザ回路に関する。 The present invention relates to a sound signal equalizer circuit for enabling reproduction of rich sound with respect to audibility during reproduction of band-limited audio signals.

【0002】 [0002]

【従来の技術】音響信号の伝送記録については、適合する帯域があり、例えば、FM放送では0〜15kHz、C For transmission record of the Related Art Acoustic signals, there are compatible band, for example, 0~15KHz in FM broadcast, C
Dでは0〜20kHzが好適な伝送帯域である。 In D 0~20KHz is the preferred transmission band. この伝送帯域の上限周波数をf Cとすると、これはf Cをカットオフ周波数とする一種のローパスフィルタ(LPF)と見ることができ、音源の周波数が図2(a)に示すようにf C以下の場合には上記ローパスフィルタ(LPF)を介してもそのまま記録又は伝送されるので問題はない。 When the upper limit frequency of the transmission band and f C, which can be seen as a kind of low-pass filter (LPF) to cut-off frequency f C, f C such that the frequency of the sound source is shown in FIG. 2 (a) no problem since it is directly recorded or transmitted even through the low-pass filter (LPF) in the following cases.

【0003】ところが図2(b)に示すように音源にf [0003] However f to the sound source, as shown in FIG. 2 (b)
C以上の成分がある場合にはf C以上の成分が上記ローパスフィルタ(LPF)で除去されて伝送又は記録されて図2(c)のようになるので、当然f C以上の成分は再生されずに原音とは異なった音が再生される。 Since f C or more components if there is C or more ingredients is shown in Figure 2 are transmitted or recorded are removed by the low-pass filter (LPF) (c), or more components naturally f C is regenerated different sound is played back with the original sound without.

【0004】昨今のように収音技術がすぐれ、再生機器の性能が向上すると、FMでの15kHz以上の成分、C [0004] Recently the superior is sound collection techniques as, the improved performance of the playback device, 15 kHz or more components in the FM, C
Dでの20kHz以上の成分を除去してしまうと、音質の劣化と感じる場合がある。 When thus removed 20kHz or more components in D, which may feel the sound quality degradation. 一般に可聴音は20Hz〜20 It is generally audible sound 20Hz~20
kHzと言われているが、20kHzで感度が0になる訳ではない。 It is said that kHz, but not the sensitivity becomes zero at 20kHz.

【0005】 [0005]

【発明が解決しようとする課題】従来は上述した伝送系の帯域制限下での音響信号の再現を目標としていた。 Conventional INVENTION Problems to Solved] had the goal of reproducing the audio signals under the band limitation of the transmission system described above. しかし図2(a)に示す如く原音源がf Aの周波数分布をとるものとすると、前述のように伝送系や記録系にはその伝送帯域に制限があるため、音響信号はf Cのカットオフ周波数のローパスフィルタを通すことになり、f A However, the original sound source as shown in FIG. 2 (a) is assumed to take the frequency distribution of f A, due to a limitation in the transmission band in the transmission system or the recording system as mentioned above, the acoustic signal is cut f C pass it through a low-pass filter off frequency, f a
>f Cの信号は削除されてしまう。 > Signal of f C would be deleted. その結果、再生系で忠実に再生したとしてもf A >f Cの成分は再生できず、 As a result, components of even f A> f C as faithfully reproduced by the reproducing system can not be reproduced,
忠実再生と言う観点から問題である。 Is a problem from the standpoint of fidelity playback.

【0006】即ち、削除されてしまうf A >f Cの帯域には、豊かな高域音を発生させる周波数成分が含まれているので、従来のようにLPFと等価な伝送系でこの成分をカットしてしまうのでは、原音の忠実な再生は不可能で音質が劣化する問題がある。 [0006] That is, the bandwidth of f A> f C that would be deleted, because it contains a frequency component to generate a rich high-frequency sound, the conventional this component LPF equivalent transmission system as than would be cut, faithful reproduction is not possible sound quality of the original sound and there is a problem of deterioration.

【0007】本発明の目的は帯域制限された音響信号の再生に際し、伝送系で削除された可聴域の高周波成分を付加できるモード機能を設けて、必要に応じてこのモード機能を作用させて豊かな再生音響を得ることを可能とするための音響信号イコライザ回路を提案することにある。 [0007] Upon playback of acoustic signals purpose band-limited in the present invention, by providing a mode function capable of adding high-frequency components of the audible range, which is deleted in the transmission system, rich by the action of this mode functions as required It is to propose a sound signal equalizer circuit for making it possible to obtain a Do playback sound.

【0008】 [0008]

【課題を解決するための手段】上記目的を達成するため、本願の第1の発明の音響信号イコライザ回路は、音響信号を、所定カットオフ周波数以下の低周波成分信号と、該カットオフ周波数以上で複数の異なる周波数帯域に分割された複数の高周波成分信号と、に分離する周波数成分分離手段と、前記各高周波成分信号を振幅検波して検波信号を得る振幅検波手段と、前記各高周波成分信号から夫々所定倍の高調波成分信号を抽出する高調波成分抽出手段と、上記各高調波成分信号を前記検波信号により振幅変調し利得制御された夫々の振幅変調信号を得る振幅変調手段と、上記各振幅変調信号と前記音響信号の低周波成分信号とを合成して合成信号を得る信号合成手段と、を有することを特徴とする。 To achieve To achieve the object described above, the acoustic signal equalizer circuit of the first invention of the present application is an acoustic signal, and the following low-frequency component signal by a predetermined cut-off frequency, the cut-off frequency or higher a plurality of the high frequency component signal, the frequency component separating means for separating the amplitude detection means for obtaining a detection signal of the respective frequency component signal and an amplitude detector that is divided into a plurality of different frequency bands in the respective high-frequency component signal and amplitude modulating means for obtaining a harmonic component extracting means for extracting respective predetermined multiple harmonic component signal, by the detection signal of each harmonic component signal amplitude modulated signal s husband is amplitude modulated gain control from above signal combining means for obtaining a synthesized and combined signal and a low frequency component signal of each amplitude-modulated signal and the acoustic signal, characterized by having a.

【0009】また、本願の第2の発明の音響信号イコライザ回路は、音響信号を、所定カットオフ周波数以下の低周波成分信号と、該カットオフ周波数以上で複数の異なる周波数帯域に分割された複数の高周波成分信号と、 [0009] The acoustic signal equalizer circuit of the second aspect of the present invention, a plurality of acoustic signals, is divided and the following low-frequency component signal by a predetermined cutoff frequency, to a plurality of different frequency bands in the cut-off frequency or higher and the high-frequency component signals,
に分離する周波数成分分離手段と、前記各高周波成分信号を振幅検波して検波信号を得る振幅検波手段と、前記各高周波成分信号のゼロクロス点を検出して各ゼロクロス信号を出力するゼロクロス検出手段と、上記各ゼロクロス信号を前記検波信号により振幅変調し利得制御された夫々の振幅変調信号を得る振幅変調手段と、上記各振幅変調信号と前記各高周波成分信号との各差成分信号を抽出する差成分信号出力手段と、上記各差成分信号と前記音響信号の低周波成分信号とを合成して合成信号を得る信号合成手段と、を有することを特徴とする音響信号イコライザ回路。 The frequency component separating means for separating, the amplitude detection means for obtaining a detection signal of the respective frequency component signal by amplitude detection, a zero-cross detecting means for outputting a respective zero-crossing signal by detecting the zero-cross point of each high-frequency component signal difference extracting the respective difference component signals of said each of the zero-cross signal is amplitude-modulated by the detection signal gain controlled respectively amplitude modulating means for obtaining an amplitude modulated signal, each of the amplitude-modulated signal and said each high-frequency component signal acoustic signal equalizer circuit, characterized in that it comprises a component signal output means, said each difference component signal and the acoustic signal of the low-frequency component signal and combining the signal synthesizing means for obtaining a combined signal, and the.

【0010】更に本願の第3の発明の音響信号イコライザ回路は、音響信号を、所定カットオフ周波数以下の低周波成分信号と、該カットオフ周波数以上で複数の異なる周波数帯域に分割された複数の高周波成分信号と、に分離する周波数成分分離手段と、前記各高周波成分信号を振幅検波して検波信号を得る振幅検波手段と、前記各周波成分信号のゼロクロス点を検出して各ゼロクロス信号を出力するゼロクロス検出手段と、上記各ゼロクロス信号を前記検波信号により振幅変調し利得制御された夫々の振幅変調信号を得る振幅変調手段と、上記各振幅変調信号と前記各周波成分信号との各和成分信号を抽出する和成分信号出力手段と、上記各和成分信号と前記音響信号の低周波成分信号とを合成して合成信号を得る信号合成手段と、を有 Furthermore acoustic signal equalizer circuit of the third invention of the present application is an acoustic signal, and the following low-frequency component signal by a predetermined cutoff frequency, a plurality of which are divided into a plurality of different frequency bands in the cut-off frequency or higher a frequency component separating means for separating into a high frequency component signal, the output and the high-frequency component signal and amplitude detection to obtain a detected signal amplitude detecting means, said each zero crossing signal by detecting the zero-cross point of the frequency component signals each sum component of the zero-crossing detector, and an amplitude modulation means for obtaining an amplitude-modulated signal s husband is amplitude modulated gain control by the detection signal of the respective zero-cross signal, the respective amplitude-modulated signal and said each frequency component signals that Yes and sum component signal output means for extracting a signal, and a signal synthesizing means for obtaining a synthesized signal by synthesizing the low frequency component signal of each sum component signal and the acoustic signal, the ることを特徴とする。 And wherein the Rukoto.

【0011】なお、本願の第4の発明の音響信号イコライザ回路は、前記第1、第2又は第3の発明の回路において、前記合成信号と前記音響信号とのいずれかを選択して出力する選択出力手段を有することを特徴とする。 [0011] Incidentally, the acoustic signal equalizer circuit according to a fourth aspect of the present invention, the first, in the circuit of the second or third invention, and selects and outputs one of the combined signal and the acoustic signal and It characterized by having a selection output means.

【0012】 [0012]

【作用】第1の発明の回路において、音響信号は低周波数成分信号と、複数の異なる周波数帯域に分割された高周波成分信号と、に分離される。 [Action] In the circuit of the first invention, the acoustic signal is separated into a low frequency component signal, a high frequency component signal divided into a plurality of different frequency bands. 各高周波成分信号は振幅検波されて検波信号を得ると共に所定倍の各高調波成分信号を抽出する。 Each high-frequency component signal extracts the harmonic component signals of predetermined times with obtaining a detection signal is amplitude detected. 各高調波成分信号は上記検波信号により振幅変調されて得られた利得制御された各振幅変調信号と前記低周波成分信号とが合成される。 Each harmonic component signal and the low frequency component signal and the amplitude modulated signal resulting gain control is amplitude modulated by the detection signals are combined.

【0013】また第2の発明の回路では、前記各高周波成分信号のゼロクロス点が検出され、得られたゼロクロス信号が前記検波信号により振幅変調される。 [0013] In the circuit of the second aspect of the invention, the respective zero-cross point of the high-frequency component signal is detected, the zero-crossing signal obtained is amplitude modulated by the detection signal. そして各振幅変調信号と各高周波成分信号との各差成分信号と前記低周波成分信号とが合成される。 And wherein the low-frequency component signal is combined with the respective difference component signals each amplitude-modulated signal and the high frequency component signal.

【0014】更に第3の発明の回路では、前記ゼロクロス信号を振幅変調した各振幅変調信号と各高周波成分信号との各和成分信号と前記低周波成分信号とが合成される。 Furthermore in the circuit of the third invention, the amplitude-modulated signal the zero-cross signal amplitude-modulated with said low frequency component signal and the sum component signal of each frequency component signals are combined.

【0015】なお、第4の発明の回路によると、前記各回路で、合成信号と音響信号とを、任意に選択して出力することができる。 [0015] Incidentally, according to the circuit of the fourth invention, in each circuit, the composite signal and the sound signal can be output by selecting arbitrarily.

【0016】 [0016]

【実施例】以下図面に示す本発明の各実施例を説明する。 Each embodiment of the invention shown in [Example] Hereinafter drawings. 図1は第1の発明による音響信号イコライザ回路の一実施例である。 Figure 1 shows an embodiment of an acoustic signal equalizer circuit according to the first invention. 同図において、1は帯域制限された音響信号、2は分波器で、前記周波数成分分離手段に相当する。 In the figure, the acoustic signal 1 is band-limited, 2 is a duplexer, which corresponds to the frequency component separating means. 分波器2は、例えば、カットオフ周波数f Lの1 Demultiplexer 2, for example, the first cut-off frequency f L
個のローパスフィルタと、センター周波数がf L以上のf H1 ,f H2 ,f H3 ,f H4の4チャンネルの狭帯域バンドパスフィルタとから成るものとし、3は低周波成分信号E Lの出力端子、4〜7は各高周波成分信号E H1 〜E H4 And number of the low-pass filter, it is assumed that the center frequency comprising a narrow band-pass filter 4 Channel f L or more f H1, f H2, f H3 , f H4, 3 an output terminal of the low-frequency component signal E L each 4 to 7 high-frequency component signal E H1 to E H4
の出力端子である。 Which is the output terminal. 8−1〜8−4は2乗回路及び9− 8-1 to 8-4 are squaring circuits and 9-
1〜9−4は中心周波数が2f H1 〜2f H4のバンドパスフィルタで、前記高調波成分抽出手段を構成する。 1~9-4 the center frequency band pass filter of the 2f H1 ~2f H4, constituting the harmonic component extracting means.

【0017】10−1〜10−4は利得制御回路(又は振幅変調回路)で、前記振幅変調手段を構成する。 [0017] 10-1 to 10-4 by a gain control circuit (or amplitude modulation circuit), constituting said amplitude modulating means. 11 11
−1〜11−4はエンベロープ検波器で、前記振幅検波手段を構成する。 -1~11-4 the envelope detector, constituting the amplitude detection means. 12は加算回路で、前記信号合成手段に相当する。 12 is a summing circuit, corresponding to the signal synthesizing means. 13は出力信号、14−1〜14−4は減衰器である。 13 output signal, 14-1 to 14-4 is attenuator. 15はスイッチで、前記選択出力手段を構成する。 15 is a switch, constitutes the selection output means.

【0018】音響信号1は分波器2によりカットオフ周波数f L以下の低周波成分信号E Lと、チャンネルの異なる周波数帯域の高周波成分信号E H1 〜E H4と、に分離される。 The audio signal 1 is a demultiplexer 2 low frequency component signal below the cut-off frequency f L by E L, a high frequency component signal E H1 to E H4 of different frequency bands of channels are separated into.

【0019】各高周波成分信号E H1 〜E H4は2乗回路8 [0019] Each high frequency component signal E H1 to E H4 squared circuits 8
−1〜8−4及びエンベロープ検波器11−1〜11− -1~8-4 and envelope detector 11-1 to 11-
4に加えられ、各2乗回路の出力はバンドパスフィルタ9−1〜9−4を介して夫々2f H1 〜2f H4中心の高調波成分信号が抽出される。 Was added to 4, the output of each squaring circuit harmonic component signals through a band-pass filter 9-1 to 9-4 respectively 2f H1 ~2f H4 centers are extracted.

【0020】ここで、例えば、f H1中心の高周波成分信号E H1が E H1 =e 1 cosω H1 t (1) とすると、その2乗出力E H1 2は E H1 2 =(e 1 2 /2)+(e 1 2 /2)cos2ω H1 t (2) [0020] Here, for example, if f H1 center of the high frequency component signal E H1 is E H1 = e 1 cosω H1 and t (1), the square of the output E H1 2 is E H1 2 = (e 1 2 /2 ) + (e 1 2/2 ) cos2ω H1 t (2)

【0021】(2)式の第2項の成分が前記バンドパスフィルタを介して抽出される。 [0021] (2) component of the second term of the formula is extracted through the band-pass filter. 図3(a)は分波器2の出力特性、同図(b)は各バンドパスフィルタ9−1〜 3 (a) shows the output characteristic of the demultiplexer 2, FIG. (B) Each band-pass filter 9-1
9−4の各出力特性を夫々示しており、2f H1の成分をa 1 、2f H2の成分をa 2 、2f H3の成分をa 3 、2f H4 Each output characteristics of 9-4 shows respective components of 2f H1 a 1, 2f components of H2 a 2, 2f components of H3 a 3, 2f H4
の成分をa 4としてf L以下の成分に加えると、図3 The addition of components to f L following ingredients as a 4, 3
(c)のようになり、f Lのカットオフフィルタで消失した成分が復元できる。 It looks like (c), can restore lost components cutoff filter f L.

【0022】エンベロープ検波器11−1〜11−4は各高周波成分信号E H1 〜E H4の振幅を検波し、各検波信号を利得制御回路10−1〜10−4に夫々送る。 The envelope detector 11-1 to 11-4 is detected the amplitude of each frequency component signal E H1 to E H4, it sends each respective detection signals to the gain control circuit 10-1 to 10-4. 各利得制御回路は前記各高調波成分信号を上記各検波信号により振幅変調してE H1 〜E H4の振幅a 1 〜a 4に比例するように利得制御された振幅変調信号を出力し減衰器14 Each gain control circuit attenuator outputs an amplitude modulated signal gain control to be proportional to the amplitude a 1 ~a 4 of E H1 to E H4 said each harmonic component signal and an amplitude modulated by the respective detection signals 14
−1〜14−4を介して加算回路12で低周波成分信号E Lと合成する。 -1~14-4 synthesizing the low frequency component signal E L by the addition circuit 12 via the.

【0023】本来、高調波歪は少ない方がよいが、図4 [0023] Originally, the harmonic distortion is better is small, as shown in FIG. 4
の聴覚の感度の説明図に示すように、聴覚は周波数f 0 As shown in the explanatory view of the hearing sensitivity, auditory frequency f 0
(1.5〜2.5kHz)以下では音の位相に対して感度があるが、図4の実線で示すf 0以上の信号に対しては位相には不感で振幅のみに感じることが知られている。 There are sensitive to the phase of the sound in (1.5~2.5kHz) hereinafter, is known to feel only the amplitude insensitive to the phase with respect to f 0 or more signals indicated by the solid line in FIG. 4 ing.

【0024】従って図3でf C >f 0ならば、f C以上の成分は歪としては感じることなく、元の信号源、即ち、 [0024] Thus if f C> f 0 in FIG. 3, f C or more components without feeling as strain, the original signal source, i.e.,
Cで遮断する前の信号と、振幅では近くなることは図3に示した通りである。 and the signal before blocking with f C, the closer the amplitude is as shown in FIG.

【0025】なお、図1の実施例において、減衰器14 [0025] In the examples of FIG. 1, the attenuator 14
−1〜14−4の係数を零にして、高調波成分を零にすることは勿論可能である。 The coefficient of -1~14-4 to zero, it is of course possible to zero harmonic components. 更に各高周波成分信号E H1 Furthermore the high frequency component signal E H1 ~
H4と、各2乗回路の出力成分との乗算により得られた第3高調波成分を付加することも可能である。 And E H4, it is also possible to add a third harmonic component obtained by multiplying the output components of each squaring circuit. またスイッチ15を設け、加算回路11からの出力信号13(合成信号)と、音響信号とを選択可能とすることもできる。 The switch 15 is provided, the output signal 13 from the summing circuit 11 (composite signal), can also be an acoustic signal can be selected.

【0026】図5は第2の発明による音響信号イコライザ回路の一実施例で、図1と同一符号は同一又は類似の回路をあらわし、16−1〜16−4はゼロクロス発生器で、前記ゼロクロス検出手段を構成する。 [0026] Figure 5 is one embodiment of an acoustic signal equalizer circuit according to the second invention, FIG. 1 and the same reference numerals represent the circuit of the same or similar, 16-1 to 16-4 in the zero-crossing generator, said zero-crossing constitute a detection means. 17−1〜 17-1~
17−4は差動増幅器で、前記差成分信号出力手段を構成する。 17-4 is a differential amplifier, constituting the difference component signal output means.

【0027】まず、分波器2からの高周波成分信号E H1 Firstly, the high-frequency component signal from the demultiplexer 2 E H1
(図6(a))はゼロクロス発生器16−1に加えられて、0レベルでの立上り、立下りの明確な方形波のゼロクロス信号(図6(b))に変換される。 (FIG. 6 (a)) is added to the zero-crossing generator 16-1, rising at zero level, a clear square wave zero cross signal of the falling is converted to (Figure 6 (b)).

【0028】また振幅検波器(エンベロープ検波器)1 Further amplitude detector (envelope detector) 1
1−1は図6(a)の破線で示す振幅を検波して、その検波信号により振幅変調器10−1が上記ゼロクロス信号を振幅変調して利得制御された図6(c)に示す波形の振幅変調信号を得る。 1-1 by detecting the amplitude indicated by the broken line in FIG. 6 (a), the waveform shown in FIG. 6 the amplitude modulator 10-1 is gain controlled by the amplitude modulating said zero-cross signal (c) by the detected signal obtaining amplitude modulation signal. 該振幅変調信号と前記高周波成分信号E H1とは差動増幅器17−1に加えられ、図6 Wherein the amplitude modulated signal and the high frequency component signal E H1 is applied to the differential amplifier 17-1, 6
(d)に示す両信号の差成分信号を得る。 Obtaining a difference component signal of the two signals shown in (d). 前記振幅変調信号(図6(c))は高周波成分信号E H1 (図6 It said amplitude modulated signal (FIG. 6 (c)) is a high-frequency component signal E H1 (FIG. 6
(a))と振幅は一致しているので、上記差成分信号では、基本波成分が打ち消されて高調波成分が主体となっている。 (A)) and the amplitude are matched, in the above difference component signal, the harmonic component becomes mainly been canceled the fundamental wave component. この差成分信号は減衰器14−1を通すことにより上記高調波成分の調整をして加算回路11に入力される。 The difference component signal is inputted to the adding circuit 11 by the adjustment of the harmonic components by passage through an attenuator 14-1.

【0029】分波器2からの他の高周波成分信号E H2 The partial addition of the high frequency component signal E H2 ~ from filter 2
H4に対しても同様な処理が行われ、加算回路11は各差成分信号と低周波成分信号E Lとが合成され、合成信号(図6(e))13がスイッチ15に出力される。 Similar processing is performed also for E H4, the adder circuit 11 is synthesized with the difference component signal and the low frequency component signal E L, composite signal (FIG. 6 (e)) 13 is output to the switch 15 .

【0030】図7は第3の発明による音響信号イコライザ回路の一実施例で、図5と同一符号は同一又は類似の回路をあらわし、18−1〜18−4は加算器で、前記和成分信号出力手段を構成する。 [0030] Figure 7 is one embodiment of an acoustic signal equalizer circuit according to the third invention, Fig. 5 the same reference numerals represent the circuit of the same or similar, 18-1 to 18-4 in the adder, the sum component constituting the signal output means. 19−1a,19−1 19-1a, 19-1
b,19−2a,19−2b,19−3a,19−3 b, 19-2a, 19-2b, 19-3a, 19-3
b,19−4a,19−4bは夫々連動した係数がk 1 ,(1−k 1 ),k 2 ,(1−k 2 ),k 3 ,(1− b, 19-4a, 19-4b are coefficients k 1 were respectively linked, (1-k 1), k 2, (1-k 2), k 3, (1-
3 ),k 4 ,(1−k 4 )の夫々1対の減衰器である。 k 3), k 4, a damper of each pair of (1-k 4).

【0031】前記高周波成分信号E H1はゼロクロス発生器16−1に加えられ、例えばE H1が図8(a)の波形であるとして同図(b)に示すゼロクロス信号を発生する。 [0031] The high-frequency component signal E H1 is applied to the zero-crossing generator 16-1, for example, E H1 to generate a zero cross signal shown in (b) as the waveform of FIG. 8 (a). このゼロクロス信号は振幅変調器(又は利得制御回路)10−1で前記振幅検波信号により振幅変調され、 The zero-crossing signal is amplitude modulated by the amplitude detection signal amplitude modulator (or gain control circuit) 10-1,
振幅がE H1と等しくなるように利得制御された振幅変調信号を出力する。 Amplitude outputs an amplitude modulated signal gain control to be equal to E H1. この振幅変調信号及び前記高周波成分信号E H1は夫々減衰器19−1a,19−1bを通ることによりk 1倍、(1−k 1 )倍され加算器18−1で加算されて図8(c)の波形の和成分信号となって加算回路11に送られる。 The amplitude modulated signal and the high frequency component signal E H1 are each attenuator 19-1a, k 1 times by passing through the 19-1B, it is summed by (1-k 1) multiplied by the adder 18-1 8 ( is sent to the adder circuit 11 becomes a sum component signal of the waveform of c).

【0032】前記高周波成分信号E H2 ,E H3 ,E H4についても同様な処理が行われるが、各減衰器の係数はk 1 [0032] The A similar process applies to the high-frequency component signal E H2, E H3, E H4 is performed, the coefficient of each attenuator k 1
<k 2 <k 34に設定する。 <Set to k 2 <k 3 <4. 加算回路11は各和成分信号と低周波成分信号E Lを合成し、その合成信号13をスイッチ15に出力する。 Summing circuit 11 combines the sum component signal and the low frequency component signal E L, and outputs the combined signal 13 to the switch 15.

【0033】 [0033]

【発明の効果】以上説明したように本発明の音響信号イコライザ回路によれば、帯域制限された音響信号の再生時に帯域外の高周波成分信号を付加することにより聴感上豊かな音質を再現することができる。 According to the acoustic signal equalizer circuit of the present invention as described above, according to the present invention, to reproduce the audibility rich sound by adding a band of high-frequency component signal during reproduction of the band-limited sound signals can.

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

【図1】本願の第1の発明の一実施例を示すブロック図である。 1 is a block diagram showing an embodiment of a first invention of the present application.

【図2】音信号の周波数f Aと伝送帯域との関係を示す特性図である。 It is a characteristic diagram showing a relationship between a frequency f A and the transmission band of Figure 2 the sound signal.

【図3】図1の実施例の動作説明用の周波数特性図である。 3 is a frequency characteristic diagram for explaining the operation of the embodiment of FIG.

【図4】聴覚の周波数特性の説明図である。 4 is an explanatory diagram of auditory frequency characteristic.

【図5】本願の第2の発明の一実施例を示すブロック図である。 5 is a block diagram showing an embodiment of a second invention of the present application.

【図6】図5の実施例の動作説明用の波形図である。 6 is a waveform diagram for explaining the operation of the embodiment of FIG.

【図7】本願の第3の発明の一実施例を示すブロック図である。 7 is a block diagram showing an embodiment of a third invention of the present application.

【図8】図7の実施例の動作説明用の波形図である。 8 is a waveform diagram for explaining the operation of the embodiment of FIG.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 音響信号 2 分波器 8−1〜8−4 2乗回路 10−1〜10−4 利得制御(振幅変調)回路 11−1〜11−4 エンベロープ(振幅)検波回路 12 加算回路 15 スイッチ 16−1〜16−4 差動増幅器 18−1〜18−4 加算器 1 sound signal second duplexer 8-1 to 8-4 square circuits 10-1 to 10-4 gain control (amplitude modulation) circuit 11-1 to 11-4 envelope (amplitude) detection circuit 12 addition circuit 15 switch 16 -1~16-4 differential amplifier 18-1 to 18-4 adder

Claims (4)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 音響信号を、所定カットオフ周波数以下の低周波成分信号と、該カットオフ周波数以上で複数の異なる周波数帯域に分割された複数の高周波成分信号と、に分離する周波数成分分離手段と、 前記各高周波成分信号を振幅検波して検波信号を得る振幅検波手段と、 前記各高周波成分信号から夫々所定倍の高調波成分信号を抽出する高調波成分抽出手段と、 上記各高調波成分信号を前記検波信号により振幅変調し利得制御された夫々の振幅変調信号を得る振幅変調手段と、 上記各振幅変調信号と前記音響信号の低周波成分信号とを合成して合成信号を得る信号合成手段と、 を有することを特徴とする音響信号イコライザ回路。 1. A sound signal, a predetermined cut-off frequency and less low frequency component signal, the frequency component separating means for separating a plurality of high-frequency component signal that is divided into a plurality of different frequency bands in the cut-off frequency above, When the each high-frequency component signal and amplitude detection to obtain a detected signal amplitude detecting means, a harmonic component extracting means for extracting respective predetermined multiple harmonic component signals from each of the high-frequency component signal, each of the harmonic components signal combining to obtain the amplitude modulation means for obtaining an amplitude-modulated signal s husband is amplitude modulated gain control by the detection signal of the signal, the synthesized and the synthesized signal and a low frequency component signal of each amplitude-modulated signal and the acoustic signal acoustic signal equalizer circuit, characterized in that it comprises a means.
  2. 【請求項2】 音響信号を、所定カットオフ周波数以下の低周波成分信号と、該カットオフ周波数以上で複数の異なる周波数帯域に分割された複数の高周波成分信号と、に分離する周波数成分分離手段と、 前記各高周波成分信号を振幅検波して検波信号を得る振幅検波手段と、 前記各高周波成分信号のゼロクロス点を検出して各ゼロクロス信号を出力するゼロクロス検出手段と、 上記各ゼロクロス信号を前記検波信号により振幅変調し利得制御された夫々の振幅変調信号を得る振幅変調手段と、 上記各振幅変調信号と前記各高周波成分信号との各差成分信号を抽出する差成分信号出力手段と、 上記各差成分信号と前記音響信号の低周波成分信号とを合成して合成信号を得る信号合成手段と、 を有することを特徴とする音響信号イコライザ回 Wherein the acoustic signal, a predetermined cut-off frequency and less low frequency component signal, the frequency component separating means for separating a plurality of high-frequency component signal that is divided into a plurality of different frequency bands in the cut-off frequency above, When an amplitude detection means for obtaining a detection signal of the respective frequency component signal by amplitude detection, the zero-crossing detecting means for outputting a respective zero-crossing signal by detecting the zero-cross point of the high-frequency component signal, each of the above zero-crossing signal the and amplitude modulating means for obtaining an amplitude-modulated signal s husband is gain controlled by amplitude-modulating the detected signal, and the difference component signal output means for extracting the difference component signal of each amplitude-modulated signal and said each high-frequency component signal, said acoustic signal equalizer times characterized by having a signal combining means for obtaining a synthesized signal by synthesizing the low frequency component signal of each difference component signal and the acoustic signal 路。 Road.
  3. 【請求項3】 音響信号を、所定カットオフ周波数以下の低周波成分信号と、該カットオフ周波数以上で複数の異なる周波数帯域に分割された複数の高周波成分信号と、に分離する周波数成分分離手段と、 前記各高周波成分信号を振幅検波して検波信号を得る振幅検波手段と、 前記各周波成分信号のゼロクロス点を検出して各ゼロクロス信号を出力するゼロクロス検出手段と、 上記各ゼロクロス信号を前記検波信号により振幅変調し利得制御された夫々の振幅変調信号を得る振幅変調手段と、 上記各振幅変調信号と前記各周波成分信号との各和成分信号を抽出する和成分信号出力手段と、 上記各和成分信号と前記音響信号の低周波成分信号とを合成して合成信号を得る信号合成手段と、 を有することを特徴とする音響信号イコライザ回路。 Wherein an acoustic signal, a predetermined cut-off frequency and less low frequency component signal, the frequency component separating means for separating a plurality of high-frequency component signal that is divided into a plurality of different frequency bands in the cut-off frequency above, When the amplitude detection means for obtaining a detection signal of each frequency component signal by amplitude detection, the zero-crossing detecting means for detecting a zero cross point of the frequency component signal outputs each zero-crossing signals, the respective zero-cross signal the and amplitude modulating means for obtaining an amplitude modulated gain-controlled respectively amplitude modulated signal by the detection signal, and the sum component signal output means for extracting the sum component signal of each amplitude-modulated signal and said each frequency component signals, said acoustic signal equalizer circuit, characterized in that it has a, and synthesized to a signal synthesizing means for obtaining a combined signal and a low frequency component signal of each sum component signal and the acoustic signal.
  4. 【請求項4】 前記合成信号と前記音響信号とのいずれかを選択して出力する選択出力手段を有することを特徴とする請求項1,2又は3に記載の音響信号イコライザ回路。 4. A sound signal equalizer circuit according to claim 1, 2 or 3, characterized in that a selective output means for selectively outputting one of said combined signal and said sound signal.
JP2202692A 1992-01-10 1992-01-10 Acoustic signal equalizer circuit Granted JPH05191885A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2202692A JPH05191885A (en) 1992-01-10 1992-01-10 Acoustic signal equalizer circuit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2202692A JPH05191885A (en) 1992-01-10 1992-01-10 Acoustic signal equalizer circuit
US07993389 US5388159A (en) 1991-12-20 1992-12-18 Equalizing circuit for reproduced signals

Publications (1)

Publication Number Publication Date
JPH05191885A true true JPH05191885A (en) 1993-07-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2202692A Granted JPH05191885A (en) 1992-01-10 1992-01-10 Acoustic signal equalizer circuit

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JP (1) JPH05191885A (en)

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JPH05227588A (en) * 1992-02-12 1993-09-03 Onkyo Corp Acoustic reproducer
WO1999057936A3 (en) * 1998-04-30 2000-01-06 Boerder Klaus Method and device for the electroacoustic transmission of acoustic energy
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US9431020B2 (en) 2001-11-29 2016-08-30 Dolby International Ab Methods for improving high frequency reconstruction
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