JP5030627B2 - Sound effect circuit and sound effect realization method - Google Patents

Sound effect circuit and sound effect realization method Download PDF

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JP5030627B2
JP5030627B2 JP2007068424A JP2007068424A JP5030627B2 JP 5030627 B2 JP5030627 B2 JP 5030627B2 JP 2007068424 A JP2007068424 A JP 2007068424A JP 2007068424 A JP2007068424 A JP 2007068424A JP 5030627 B2 JP5030627 B2 JP 5030627B2
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真行 神田
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Seiko NPC Corp
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Description

本発明は、音で臨場感を与える信号を出力する音響効果回路及び音響効果実現方法に関する。   The present invention relates to a sound effect circuit and a sound effect realization method for outputting a signal that gives a sense of presence with sound.

ステレオ音声信号等で音響効果を高める技術には、例えば特許文献１に示されたものがある。
特許第２７９７３４７号公報 For example, Patent Document 1 discloses a technique for enhancing the acoustic effect with a stereo audio signal or the like.
Japanese Patent No. 2797347

特許文献１では、左信号と右信号との和信号、或は左信号と右信号の差信号を求め、様々な反射音成分（エコー成分）を擬似的に生成するためにメモリを用い、和信号或は差信号に１０ｍｓ〜数１００ｍｓに及ぶ異なる複数の遅延を掛けている。そして、左信号に遅延された信号を加算するとともに、右信号に遅延された信号を加算している。   In Patent Document 1, a sum signal of a left signal and a right signal, or a difference signal between a left signal and a right signal is obtained, and a memory is used to artificially generate various reflected sound components (echo components). The signal or the difference signal is multiplied by a plurality of different delays ranging from 10 ms to several 100 ms. Then, the delayed signal is added to the left signal, and the delayed signal is added to the right signal.

特許文献１の技術は、反射音成分を作成するので、再生したときに臨場感が得られる。しかしながら、反射音成分は、多数の反射があるものとして、その量も含めて仮想的に作成したものであり、その作成した反射音成分を含む音響信号を再生したときには、不自然な感じがどうしても残る。
また、逐次生成される和信号或は差信号に対して、１０ｍｓ〜数１００ｍｓに及ぶ遅延を与えるためには、メモリに和信号或は差信号の多数のデータを書込む必要があり、大きな容量のメモリが必要であった。例えば、１０ｍｓの遅延を４８ＫＨｚでサンプリングしてメモリに書込む場合を想定すると、４８０ワードのデータをメモリに書込む必要があった。 Since the technique of Patent Document 1 creates a reflected sound component, a sense of reality can be obtained when reproduced. However, the reflected sound component is virtually created including a large number of reflections, and when the acoustic signal including the created reflected sound component is reproduced, an unnatural feeling is unavoidable. Remain.
In addition, in order to give a delay of 10 ms to several hundreds of ms for the sum signal or difference signal generated sequentially, it is necessary to write a large number of data of the sum signal or difference signal in the memory, which has a large capacity. Memory was required. For example, assuming that a 10 ms delay is sampled at 48 KHz and written to the memory, 480 words of data must be written to the memory.

本発明は、回路面積を大幅に削減でき、自然な音響効果が得られる音響効果回路を提供することを目的とする。   An object of the present invention is to provide an acoustic effect circuit that can significantly reduce the circuit area and obtain a natural acoustic effect.

上記目的を達成するために、本発明の第１の観点に係る音響効果回路は、
音を示す左信号に対して高周波成分を減衰させる第１のフィルタと、
音を示す右信号に対して高周波成分を減衰させる第２のフィルタと、
前記第１のフィルタの出力信号と前記第２のフィルタの出力信号との和の和信号を生成する和信号生成手段と、
前記第１のフィルタの出力信号と前記第２のフィルタの出力信号との差の差信号を生成する差信号生成手段と、
前記和信号を０．６５ｍｓ以下の時間分遅延させる和信号遅延手段と、
前記差信号を０．６５ｍｓ以下の時間分遅延させる差信号遅延手段と、
前記左信号と前記和信号遅延手段で遅延された和信号と前記差信号遅延手段で遅延された差信号と前記和信号生成手段で生成された和信号と前記差信号生成手段で生成された差信号とを合成して第１の出力信号を生成する第１の合成手段と、
前記右信号と前記和信号遅延手段で遅延された和信号と前記差信号遅延手段で遅延された差信号と前記和信号生成手段で生成された和信号と前記差信号生成手段で生成された差信号とを合成して第２の出力信号を生成する第２の合成手段と、
を備えることを特徴とする。 In order to achieve the above object, an acoustic effect circuit according to the first aspect of the present invention provides:
A first filter for attenuating high-frequency components with respect to the left signal indicating sound;
A second filter for attenuating high-frequency components with respect to the right signal indicating sound;
Sum signal generation means for generating a sum signal of the sum of the output signal of the first filter and the output signal of the second filter;
Difference signal generation means for generating a difference signal between the output signal of the first filter and the output signal of the second filter;
Sum signal delay means for delaying the sum signal by a time of 0.65 ms or less;
Difference signal delay means for delaying the difference signal by a time of 0.65 ms or less;
The left signal, the sum signal delayed by the sum signal delay means, the difference signal delayed by the difference signal delay means, the sum signal generated by the sum signal generation means, and the difference generated by the difference signal generation means a first combining means for generating a first output signal by synthesizing the signal,
The right signal, the sum signal delayed by the sum signal delay means, the difference signal delayed by the difference signal delay means, the sum signal generated by the sum signal generation means, and the difference generated by the difference signal generation means and second combining means for generating a second output signal by synthesizing the signal,
It is characterized by providing.

なお、前記和信号遅延手段は、逐次与えられる前記和信号の前記０．６５ｍｓ以下の時間分の値を記憶するメモリで構成され、
前記差信号遅延手段は、逐次与えられる前記差信号の前記０．６５ｍｓ以下の時間分の値を記憶するメモリで構成されていてもよい。 The sum signal delay means comprises a memory for storing a value for the time of 0.65 ms or less of the sum signal given sequentially,
The difference signal delay means may be constituted by a memory for storing a value for the time of 0.65 ms or less of the difference signal given sequentially.

また、前記第１のフィルタは、遮断周波数が６±３ＫＨｚのローパスフィルタであり、
前記第２のフィルタは、遮断周波数が６±３ＫＨｚのローパスフィルタであってもよい。 Further, the first filter is a low-pass filter having a cutoff frequency of 6 ± 3 KHz,
The second filter may be a low-pass filter having a cutoff frequency of 6 ± 3 KHz.

上記目的を達成するために、本発明の第２の観点に係る音響効果実現方法は、
音を示す左信号に対して第１のフィルタを用いて高周波成分を減衰させる第１のフィルタ処理と、
音を示す右信号に対して第２のフィルタを用いて高周波成分を減衰させる第２のフィルタ処理と、
前記第１のフィルタの出力信号と前記第２のフィルタの出力信号との和の和信号を生成する和信号生成処理と、
前記第１のフィルタの出力信号と前記第２のフィルタの出力信号との差の差信号を生成する差信号生成処理と、
前記和信号を０．６５ｍｓ以下で遅延させる和信号遅延処理と、
前記差信号を０．６５ｍｓ以下で遅延させる差信号遅延処理と、
前記左信号と前記和信号遅延処理で遅延された和信号と前記差信号遅延処理で遅延された差信号と前記和信号生成処理で生成された和信号と前記差信号生成処理で生成された差信号とを合成して第１の出力信号を生成する第１の合成処理と、
前記右信号と前記和信号遅延処理で遅延された和信号と前記差信号遅延処理で遅延された差信号と前記和信号生成処理で生成された和信号と前記差信号生成処理で生成された差信号とを合成して第２の出力信号を生成する第２の合成処理と、
を行うことを特徴とする。 In order to achieve the above object, a method for realizing an acoustic effect according to the second aspect of the present invention includes:
A first filter process for attenuating a high frequency component using a first filter for a left signal indicating sound;
A second filtering process for attenuating high frequency components using a second filter with respect to the right signal indicating sound;
A sum signal generation process for generating a sum signal of the output signal of the first filter and the output signal of the second filter;
A difference signal generating process for generating a difference signal between the output signal of the first filter and the output signal of the second filter;
Sum signal delay processing for delaying the sum signal in 0.65 ms or less;
Difference signal delay processing for delaying the difference signal in 0.65 ms or less;
The left signal, the sum signal delayed by the sum signal delay process, the difference signal delayed by the difference signal delay process, the sum signal generated by the sum signal generation process, and the difference generated by the difference signal generation process A first combining process for combining the signals to generate a first output signal;
The right signal, the sum signal delayed by the sum signal delay process, the difference signal delayed by the difference signal delay process, the sum signal generated by the sum signal generation process, and the difference generated by the difference signal generation process A second combining process for combining the signals to generate a second output signal;
It is characterized by performing.

本発明によれば、自然な音響効果が得られる音響効果回路を実現できる。さらに、和信号遅延手段及び差信号遅延手段をメモリで構成した場合には、そのメモリの容量も小さくてよい。   ADVANTAGE OF THE INVENTION According to this invention, the acoustic effect circuit from which a natural acoustic effect is acquired is realizable. Further, when the sum signal delay means and the difference signal delay means are configured by a memory, the capacity of the memory may be small.

以下、図面に基づき、本発明の実施の形態について詳細に説明する。
図１は、本発明の実施形態に係る音響効果回路を示す図である。
図２は、両耳に入る音の経路を説明する説明図である。
図３は、両耳に入る音の強度差を示す図である。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram illustrating an acoustic effect circuit according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram for explaining the path of sound entering both ears.
FIG. 3 is a diagram showing the intensity difference between sounds entering both ears.

この音響効果回路は、ステレオ信号であって音を示す左信号（以下、Ｌ信号という）及び右信号（以下、Ｒ信号という）を入力し、音響効果を付けて出力する回路である。   This sound effect circuit is a circuit that inputs a left signal (hereinafter, referred to as an L signal) and a right signal (hereinafter, referred to as an R signal), which are stereo signals, and outputs a sound effect.

Ｌ信号が入力される入力端子ＩＮ１には、第１のフィルタであるローパスフィルタ１１が接続され、Ｒ信号が入力される入力端子ＩＮ２には、第２のフィルタであるローパスフィルタ１２が接続されている。これらローパスフィルタ１１，１２は、Ｌ信号及びＲ信号の高周波成分を減衰させるものであり、その遮断周波数は、６±３ＫＨｚであることが望ましい。   A low-pass filter 11 that is a first filter is connected to an input terminal IN1 to which an L signal is input, and a low-pass filter 12 that is a second filter is connected to an input terminal IN2 to which an R signal is input. Yes. These low-pass filters 11 and 12 are for attenuating the high-frequency components of the L signal and the R signal, and the cut-off frequency is preferably 6 ± 3 KHz.

人の両耳に入る音の経路は、図２のように、前方の音源Ｔから直接両耳に入る音Ｓ１ばかりでなく、回折して頭部の後方を回って各耳に入る音Ｓ２もある。音Ｓ２は低周波の場合に大きく、高周波の場合には頭部での反射により、頭部の影ができて値は小さくなる。   As shown in FIG. 2, not only the sound S1 that directly enters both ears from the front sound source T, but also the sound S2 that diffracts around the head and enters each ear as shown in FIG. is there. The sound S2 is loud when the frequency is low, and the value of the sound S2 is small when the frequency is high due to reflection from the head.

両耳に入る音の強度差は、低周波の例えば２００Ｈｚでは、図３（ｄ）のように、音の入射角による差はほとんど見られない、両耳に入る音の強度差は、図３（ａ）〜（ｃ）に示すように、音の周波数が高くなるほど、回折して頭部を回り込む音Ｓ２が減じられるので、音の入射角による差が広がる。そして、６ＫＨｚ以上になると無視できなくなる。そのため、ローパスフィルタ１１，１２の遮断周波数を６±３ＫＨｚとすることが望ましい。   The difference in the intensity of sound entering both ears is hardly observed at a low frequency of, for example, 200 Hz, as shown in FIG. 3 (d). As shown in (a) to (c), as the sound frequency increases, the sound S2 that is diffracted and goes around the head is reduced, so that the difference due to the incident angle of the sound increases. And when it becomes 6 kHz or more, it cannot be ignored. Therefore, it is desirable that the cutoff frequency of the low-pass filters 11 and 12 is 6 ± 3 KHz.

ローパスフィルタ１１の出力端子は、増幅器１３を介して加算回路１４の一方の入力端子に接続され、ローパスフィルタ１２の出力端子は、増幅器１５を介して加算回路１４の他の入力端子に接続されている。加算回路１４は、ローパスフィルタ１１の出力する信号とローパスフィルタ１２の出力信号との和である和信号を生成する和信号生成手段である。   The output terminal of the low-pass filter 11 is connected to one input terminal of the adding circuit 14 via the amplifier 13, and the output terminal of the low-pass filter 12 is connected to the other input terminal of the adding circuit 14 via the amplifier 15. Yes. The adder circuit 14 is sum signal generation means for generating a sum signal that is the sum of the signal output from the low-pass filter 11 and the output signal of the low-pass filter 12.

ローパスフィルタ１１の出力端子は、さらに、増幅器１６を介して減算回路１７の一方の入力端子に接続され、ローパスフィルタ１２の出力端子は、増幅器１８を介して減算回路１７の他の入力端子に接続されている。減算回路１７は、ローパスフィルタ１１の出力する信号とローパスフィルタ１２の出力信号との差である差信号を生成する差信号生成手段である。
この音響効果回路は、さらに、遅延回路１９，２０と合成部３０とを備えている。 The output terminal of the low-pass filter 11 is further connected to one input terminal of the subtraction circuit 17 via the amplifier 16, and the output terminal of the low-pass filter 12 is connected to the other input terminal of the subtraction circuit 17 via the amplifier 18. Has been. The subtraction circuit 17 is a difference signal generation unit that generates a difference signal that is a difference between the signal output from the low-pass filter 11 and the output signal from the low-pass filter 12.
The acoustic effect circuit further includes delay circuits 19 and 20 and a synthesis unit 30.

加算回路１４の出力端子は、和信号遅延手段である遅延回路１９に接続され、減算回路１７の出力端子は、差信号遅延手段である遅延回路２０に接続されている。
遅延回路１９はメモリ等で構成され、例えば４８ＫＨｚで和信号をサンプリングし、例えば所定時間分のデータを記憶する。遅延回路２０はメモリ等で構成され、例えば４８ＫＨｚで差信号をサンプリングし、所定時間分のデータを記憶する。
ここで、音の入射角と両耳に入る音の時間差との関係を説明する。 The output terminal of the adder circuit 14 is connected to a delay circuit 19 that is sum signal delay means, and the output terminal of the subtractor circuit 17 is connected to a delay circuit 20 that is difference signal delay means.
The delay circuit 19 is composed of a memory or the like, samples the sum signal at 48 KHz, for example, and stores data for a predetermined time, for example. The delay circuit 20 is configured by a memory or the like, for example, samples a difference signal at 48 KHz, and stores data for a predetermined time.
Here, the relationship between the incident angle of sound and the time difference between sounds entering both ears will be described.

図４（ａ），（ｂ）は、音の入射角と両耳に入る音の時間差との関係を説明するための説明図である。
両耳に入る音は、音源Ｔの位置が正面或は真後ろにない場合、時間差が生じる。即ち、図４（ａ）のように、音の到達距離に差が生じるので、音の入射角に応じて両耳に入る音に時間差が生じる。入射角とその時間差の関係は、図４（ｂ）のようになり、入射角が９０°のときに、両耳に入る音の時間差が最大で０．６５ｍｓである。 4A and 4B are explanatory diagrams for explaining the relationship between the incident angle of sound and the time difference between sounds entering both ears.
The sound entering both ears has a time difference if the position of the sound source T is not in front or directly behind. That is, as shown in FIG. 4A, a difference occurs in the sound arrival distance, so that a time difference occurs in the sound that enters both ears according to the incident angle of the sound. The relationship between the incident angle and the time difference is as shown in FIG. 4B. When the incident angle is 90 °, the time difference between sounds entering both ears is 0.65 ms at the maximum.

遅延回路１９，２０は、この両耳に入る時間差を音響効果に取り込むために設けたものであり、遅延回路１９，２０のメモリ容量は、最大で０．６５ｍｓ分のデータを記憶できればよく、この場合０．６５ｍｓの遅延量が得られる。４８Ｋｈｚでデータをサンプリングする場合、３２ワード分を記憶できればよい。
合成部３０は、増幅器３１，３２，３３，３４，３５，３６，３７，３８を備えている。 The delay circuits 19 and 20 are provided in order to capture the time difference between the two ears in the sound effect, and the memory capacity of the delay circuits 19 and 20 is only required to store data for 0.65 ms at maximum. In this case, a delay amount of 0.65 ms is obtained. When data is sampled at 48 Khz, it is only necessary to store 32 words.
The synthesizing unit 30 includes amplifiers 31, 32, 33, 34, 35, 36, 37, and 38.

入力端子ＩＮ１が増幅器３１の入力端子に接続されている。加算回路１４の出力端子が増幅器３２の入力端子に接続され、遅延回路１９の出力端子が増幅器３３の入力端子に接続されている。遅延回路２０の出力端子が増幅器３４の入力端子に接続され、減算回路１７の出力端子が増幅器３５の入力端子に接続されている。入力端子ＩＮ２が、増幅器３６の入力端子に接続されている。   The input terminal IN1 is connected to the input terminal of the amplifier 31. The output terminal of the adder circuit 14 is connected to the input terminal of the amplifier 32, and the output terminal of the delay circuit 19 is connected to the input terminal of the amplifier 33. The output terminal of the delay circuit 20 is connected to the input terminal of the amplifier 34, and the output terminal of the subtraction circuit 17 is connected to the input terminal of the amplifier 35. The input terminal IN2 is connected to the input terminal of the amplifier 36.

増幅器３１の出力端子は、合成回路４１に接続されている。
増幅器３６の出力端子は、合成回路４２に接続されている。
増幅器３２，３３の出力端子は、加算回路３９に接続され、加算回路３９の出力端子が増幅器３７を介して合成回路４１及び合成回路４２に接続されている。 増幅器３４，３５の出力端子が、加算回路４０に接続され、加算回路４０の出力端子が、増幅器３８を介して合成回路４１及び合成回路４２に接続されている。 The output terminal of the amplifier 31 is connected to the synthesis circuit 41.
The output terminal of the amplifier 36 is connected to the synthesis circuit 42.
The output terminals of the amplifiers 32 and 33 are connected to the adding circuit 39, and the output terminal of the adding circuit 39 is connected to the combining circuit 41 and the combining circuit 42 via the amplifier 37. The output terminals of the amplifiers 34 and 35 are connected to the adder circuit 40, and the output terminal of the adder circuit 40 is connected to the synthesis circuit 41 and the synthesis circuit 42 via the amplifier 38.

合成回路４１の出力端子が、音響効果回路の出力端子ＯＵＴ１に接続され、合成回路４２の出力端子が、音響効果回路の出力端子ＯＵＴ２に接続されている。   The output terminal of the synthesis circuit 41 is connected to the output terminal OUT1 of the acoustic effect circuit, and the output terminal of the synthesis circuit 42 is connected to the output terminal OUT2 of the acoustic effect circuit.

このような構成の音響効果回路では、逐次入力されるＬ信号に対し、ローパスフィルタ１１が高周波成分を減衰させる。逐次入力されるＲ信号に対して、ローパスフィルタ１２は、高周波成分を減衰させる。   In the acoustic effect circuit having such a configuration, the low-pass filter 11 attenuates the high-frequency component with respect to the L signal that is sequentially input. The low-pass filter 12 attenuates the high frequency component with respect to the R signal sequentially input.

加算回路１４は、高周波成分が減衰した状態のＬ信号とＲ信号の和の和信号を生成し、減算回路１７は、高周波成分が減衰した状態のＬ信号とＲ信号の差の差信号を生成する。   The adder circuit 14 generates a sum signal of the sum of the L signal and the R signal with the high frequency component attenuated, and the subtractor circuit 17 generates a difference signal of the difference between the L signal and the R signal with the high frequency component attenuated. To do.

遅延回路１９は、和信号を遅延する。遅延回路２０は、差信号を遅延する。
合成部３０の加算回路３９は、和信号と遅延回路１９で遅延された和信号とを加算する。加算回路４０は、差信号と遅延回路２０で遅延された差信号とを加算する。 The delay circuit 19 delays the sum signal. The delay circuit 20 delays the difference signal.
The adder circuit 39 of the synthesizer 30 adds the sum signal and the sum signal delayed by the delay circuit 19. The adder circuit 40 adds the difference signal and the difference signal delayed by the delay circuit 20.

合成回路４１は、入力端子ＩＮ１に入力されているＬ信号を増幅器３１で増幅した信号と、加算回路３９から増幅器３７を介して与えられた信号と、加算回路４０から増幅器３８を介して与えられた信号とを加算する。これにより、Ｌ信号と和信号と遅延された和信号と遅延された差信号とが合成されたことになる。   The synthesizing circuit 41 receives a signal obtained by amplifying the L signal input to the input terminal IN1 by the amplifier 31, a signal given from the adding circuit 39 via the amplifier 37, and a signal given from the adding circuit 40 via the amplifier 38. The signal is added. As a result, the L signal, the sum signal, the delayed sum signal, and the delayed difference signal are combined.

合成回路４２は、入力端子ＩＮ２に入力されているＲ信号を増幅器３６で増幅した信号と、加算回路３９から増幅器３７を介して与えられた信号と、加算回路４０から増幅器３８を介して与えられた信号とを加算する。これにより、Ｒ信号と差信号と遅延された和信号と遅延された差信号とが合成されたことになる。   The synthesizing circuit 42 is provided with a signal obtained by amplifying the R signal input to the input terminal IN2 by the amplifier 36, a signal given from the adding circuit 39 via the amplifier 37, and a signal given from the adding circuit 40 via the amplifier 38. The signal is added. As a result, the R signal, the difference signal, the delayed sum signal, and the delayed difference signal are combined.

各合成回路４１，４２の出力信号が、出力端子ＯＵＴ１，ＯＵＴ２からそれぞれ出力され、外部のスピーカ等に与えられて再生される。   The output signals of the synthesis circuits 41 and 42 are output from the output terminals OUT1 and OUT2, respectively, supplied to an external speaker or the like and reproduced.

以上の構成の本実施形態の音響効果回路は、従来のように反射音を模擬して音響効果を出すものではなく、両耳に届く音の時間差を、遅延回路１９，２０で設定し、合成回路４１，４２の出力信号に反映させている。また、回折によって頭部を回り込む音に、高周波成分はほとんど含まれないので、ローパスフィルタ１１，１２で高周波成分を減衰させている。これらにより、本実施形態の音響効果回路は、自然現象に基づいた臨場感を出すことができ、不自然さを感じさせない、自然で広がりのある音響効果が得られる。   The acoustic effect circuit of the present embodiment having the above configuration does not produce an acoustic effect by simulating reflected sound as in the prior art, and the time difference between sounds reaching both ears is set by the delay circuits 19 and 20 and synthesized. This is reflected in the output signals of the circuits 41 and 42. Further, since the high-frequency component is hardly included in the sound that goes around the head by diffraction, the high-frequency component is attenuated by the low-pass filters 11 and 12. As a result, the sound effect circuit according to the present embodiment can provide a sense of reality based on a natural phenomenon, and a natural and expansive sound effect that does not cause unnaturalness can be obtained.

また、両耳に届く音の時間差を遅延回路１９，２０で設定するため、遅延回路１９，２０を構成するメモリの容量が従来よりもはるかに小さくてよい。よって、回路面積も小さくすむ。   Further, since the time difference between the sounds reaching both ears is set by the delay circuits 19 and 20, the capacity of the memory constituting the delay circuits 19 and 20 may be much smaller than that of the prior art. Therefore, the circuit area can be reduced.

本発明の実施形態に係る音響効果回路を示す構成図である。It is a block diagram which shows the acoustic effect circuit which concerns on embodiment of this invention. 両耳に入る音の経路を説明する説明図である。It is explanatory drawing explaining the path | route of the sound which enters into both ears. 両耳に入る音の強度差を示す図である。It is a figure which shows the intensity difference of the sound which enters into both ears. 音の入射角と両耳に入る音の時間差との関係を説明するための説明図である。It is explanatory drawing for demonstrating the relationship between the incident angle of a sound, and the time difference of the sound which enters into both ears.

符号の説明Explanation of symbols

１１，１２ ローパスフィルタ
１４ 加算回路
１７ 減算回路
１９，２０ 遅延回路
３０ 合成部
３９ 加算回路
４０ 加算回路
４１ 合成回路
４２ 合成回路 DESCRIPTION OF SYMBOLS 11, 12 Low pass filter 14 Adder circuit 17 Subtraction circuit 19, 20 Delay circuit 30 Synthesis | combination part 39 Addition circuit 40 Addition circuit 41 Synthesis circuit 42 Synthesis circuit

Claims (4)

音を示す左信号に対して高周波成分を減衰させる第１のフィルタと、
音を示す右信号に対して高周波成分を減衰させる第２のフィルタと、
前記第１のフィルタの出力信号と前記第２のフィルタの出力信号との和の和信号を生成する和信号生成手段と、
前記第１のフィルタの出力信号と前記第２のフィルタの出力信号との差の差信号を生成する差信号生成手段と、
前記和信号を０．６５ｍｓ以下の時間分遅延させる和信号遅延手段と、
前記差信号を０．６５ｍｓ以下の時間分遅延させる差信号遅延手段と、
前記左信号と前記和信号遅延手段で遅延された和信号と前記差信号遅延手段で遅延された差信号と前記和信号生成手段で生成された和信号と前記差信号生成手段で生成された差信号とを合成して第１の出力信号を生成する第１の合成手段と、
前記右信号と前記和信号遅延手段で遅延された和信号と前記差信号遅延手段で遅延された差信号と前記和信号生成手段で生成された和信号と前記差信号生成手段で生成された差信号とを合成して第２の出力信号を生成する第２の合成手段と、
を備えることを特徴とする音響効果回路。 A first filter for attenuating high-frequency components with respect to the left signal indicating sound;
A second filter for attenuating high-frequency components with respect to the right signal indicating sound;
Sum signal generation means for generating a sum signal of the sum of the output signal of the first filter and the output signal of the second filter;
Difference signal generation means for generating a difference signal between the output signal of the first filter and the output signal of the second filter;
Sum signal delay means for delaying the sum signal by a time of 0.65 ms or less;
Difference signal delay means for delaying the difference signal by a time of 0.65 ms or less;
The left signal, the sum signal delayed by the sum signal delay means, the difference signal delayed by the difference signal delay means, the sum signal generated by the sum signal generation means, and the difference generated by the difference signal generation means a first combining means for generating a first output signal by synthesizing the signal,
The right signal, the sum signal delayed by the sum signal delay means, the difference signal delayed by the difference signal delay means, the sum signal generated by the sum signal generation means, and the difference generated by the difference signal generation means and second combining means for generating a second output signal by synthesizing the signal,
A sound effect circuit comprising: 前記和信号遅延手段は、逐次与えられる前記和信号の前記０．６５ｍｓ以下の時間分の値を記憶するメモリで構成され、
前記差信号遅延手段は、逐次与えられる前記差信号の前記０．６５ｍｓ以下の時間分の値を記憶するメモリで構成されていることを特徴とする請求項１に記載の音響効果回路。 The sum signal delay means is composed of a memory for storing a value for the time of 0.65 ms or less of the sum signal given sequentially,
2. The acoustic effect circuit according to claim 1, wherein the difference signal delay means is configured by a memory for storing a value for the time of 0.65 ms or less of the difference signal given sequentially. 前記第１のフィルタは、遮断周波数が６±３ＫＨｚのローパスフィルタであり、
前記第２のフィルタは、遮断周波数が６±３ＫＨｚのローパスフィルタである、
ことを特徴とする請求項１又は２に記載の音響効果回路。 The first filter is a low-pass filter having a cutoff frequency of 6 ± 3 KHz,
The second filter is a low-pass filter having a cutoff frequency of 6 ± 3 KHz.
Sound effects circuit according to claim 1 or 2, characterized in that. 音を示す左信号に対して第１のフィルタを用いて高周波成分を減衰させる第１のフィルタ処理と、
音を示す右信号に対して第２のフィルタを用いて高周波成分を減衰させる第２のフィルタ処理と、
前記第１のフィルタの出力信号と前記第２のフィルタの出力信号との和の和信号を生成する和信号生成処理と、
前記第１のフィルタの出力信号と前記第２のフィルタの出力信号との差の差信号を生成する差信号生成処理と、
前記和信号を０．６５ｍｓ以下で遅延させる和信号遅延処理と、
前記差信号を０．６５ｍｓ以下で遅延させる差信号遅延処理と、
前記左信号と前記和信号遅延処理で遅延された和信号と前記差信号遅延処理で遅延された差信号と前記和信号生成処理で生成された和信号と前記差信号生成処理で生成された差信号とを合成して第１の出力信号を生成する第１の合成処理と、
前記右信号と前記和信号遅延処理で遅延された和信号と前記差信号遅延処理で遅延された差信号と前記和信号生成処理で生成された和信号と前記差信号生成処理で生成された差信号とを合成して第２の出力信号を生成する第２の合成処理と、
を行うことを特徴とする音響効果実現方法。 A first filter process for attenuating a high frequency component using a first filter for a left signal indicating sound;
A second filtering process for attenuating high frequency components using a second filter with respect to the right signal indicating sound;
A sum signal generation process for generating a sum signal of the output signal of the first filter and the output signal of the second filter;
A difference signal generating process for generating a difference signal between the output signal of the first filter and the output signal of the second filter;
Sum signal delay processing for delaying the sum signal in 0.65 ms or less;
Difference signal delay processing for delaying the difference signal in 0.65 ms or less;
The left signal, the sum signal delayed by the sum signal delay process, the difference signal delayed by the difference signal delay process, the sum signal generated by the sum signal generation process, and the difference generated by the difference signal generation process A first combining process for combining the signals to generate a first output signal;
The right signal, the sum signal delayed by the sum signal delay process, the difference signal delayed by the difference signal delay process, the sum signal generated by the sum signal generation process, and the difference generated by the difference signal generation process A second combining process for combining the signals to generate a second output signal;
A sound effect realization method characterized by performing.
JP2007068424A 2007-03-16 2007-03-16 Sound effect circuit and sound effect realization method Expired - Fee Related JP5030627B2 (en)

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