JPH08237790A - Headphone reproducing device - Google Patents
Headphone reproducing deviceInfo
- Publication number
- JPH08237790A JPH08237790A JP7148323A JP14832395A JPH08237790A JP H08237790 A JPH08237790 A JP H08237790A JP 7148323 A JP7148323 A JP 7148323A JP 14832395 A JP14832395 A JP 14832395A JP H08237790 A JPH08237790 A JP H08237790A
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- Japan
- Prior art keywords
- sound
- signal
- listener
- reflected
- headphone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
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- Stereophonic Arrangements (AREA)
- Stereophonic System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ヘッドホン再生装置に
係り、特に音像を頭外に定位させるヘッドホン再生装置
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headphone reproducing device, and more particularly to a headphone reproducing device for localizing a sound image outside the head.
【０００２】[0002]
【従来の技術】音像を頭外定位させる信号処理を行った
従来のヘッドホン再生装置について説明する。図５は、
スピーカにより音響信号を再生した場合の、スピーカか
ら聴取者の左右の耳への伝達特性を示す図である。図６
は、従来のヘッドホン再生装置を示すブロック図であ
る。図７は、ＦＩＲ型デジタルフィルタ（畳み込み演算
器）の構成を示すブロック図である。これらの図におい
て、ある位置に置いたスピーカ４０からの音を聴取する
場合、スピーカ４０から聴取者４１に届く音は、スピー
カ４０から左耳４１Ｌ，右耳４１Ｒまでの、左右に個別
の伝達関数ｈｌ(n) ，ｈｒ(n) をもつ。ヘッドホン再生
装置５０では、この伝達関数ｈｌ(n) ，ｈｒ(n) を、入
力端子５１から入力された入力信号に合成することによ
って、スピーカ４０による音像の定位をヘッドホン５２
で疑似的に再生している。2. Description of the Related Art A conventional headphone reproducing apparatus that has performed signal processing for out-of-head localization of a sound image will be described. Figure 5
It is a figure which shows the transfer characteristic from a speaker to a listener's right and left ears at the time of reproducing an audio signal with a speaker. Figure 6
FIG. 7 is a block diagram showing a conventional headphone reproducing device. FIG. 7 is a block diagram showing the configuration of the FIR type digital filter (convolution operation unit). In these figures, when listening to the sound from the speaker 40 placed at a certain position, the sound reaching the listener 41 from the speaker 40 is the transfer function from the speaker 40 to the left ear 41L, the right ear 41R, and the left and right individual transfer functions. It has hl (n) and hr (n). In the headphone reproducing apparatus 50, the transfer functions hl (n) and hr (n) are combined with the input signal input from the input terminal 51 to determine the localization of the sound image by the speaker 40 in the headphones 52.
Is reproduced in pseudo.
【０００３】この伝達関数ｈｌ(n) ，ｈｒ(n) を合成す
るには、ダミーヘッド又は実耳を用いて測定した左右の
耳のインパルス応答が用いられ、ＤＳＰ等による信号処
理装置により入力信号にインパルス応答の畳み込み演算
が行われる。詳細には、入力端子５１から入力された入
力信号は、左チャンネル信号と右チャンネル信号とに分
岐され、夫々の信号は左右別に畳み込み演算器５３Ｌ，
５３Ｒにより畳み込み演算が行われ、畳み込み演算器５
３Ｌ，５３Ｒから出力された夫々の信号がヘッドホン５
２の左チャンネル５２Ｌ、右チャンネル５２Ｒに夫々送
られる。なお、この畳み込み演算は、 ｘ(n) ： 入力信号の離散信号系列 ｈｌ(n) ： スピーカから左耳へのインパルス応答 ｈｒ(n) ： スピーカから左耳へのインパルス応答 ｙｌ(n) ： ヘッドホンの左チャンネル再生信号系列 ｙｒ(n) ： ヘッドホンの右チャンネル再生信号系列 としたとき、 ｙｌ(n) ＝ｘ(n) ＊ｈｌ(n) ｙｒ(n) ＝ｘ(n) ＊ｈｒ(n) で示される。To combine the transfer functions hl (n) and hr (n), the impulse responses of the left and right ears measured using a dummy head or real ears are used, and an input signal is input by a signal processing device such as a DSP. Then, the convolution operation of the impulse response is performed. Specifically, the input signal input from the input terminal 51 is branched into a left channel signal and a right channel signal, and the respective signals are convolved by the convolution calculators 53L and 53L, respectively.
The convolution operation is performed by 53R, and the convolution operation unit 5
The respective signals output from the 3L and 53R are the headphones 5
It is sent to the two left channels 52L and right channels 52R respectively. The convolution operation is as follows: x (n): Discrete signal sequence of input signal hl (n): Impulse response from speaker to left ear hr (n): Impulse response from speaker to left ear yl (n): Headphones Left channel reproduction signal sequence yr (n): When the headphone right channel reproduction signal sequence is taken, yl (n) = x (n) * hl (n) yr (n) = x (n) * hr (n) Indicated by.
【０００４】このような伝達関数の畳み込み演算を行う
畳み込み演算器５３Ｌ，５３Ｒは夫々、例えば図７に示
すような多点のＦＩＲ型デジタルフィルタ６０を構成す
る必要がある。６１は１サンプルの遅延器、６２はイン
パルス応答の畳み込みを行う乗算器（ｈ(0) 〜ｈ(N) は
乗算値）、６３は乗算器６２からの出力を夫々加算する
加算器である。The convolution calculators 53L and 53R for performing the convolution calculation of the transfer function as described above are required to form a multipoint FIR digital filter 60 as shown in FIG. 7, for example. Reference numeral 61 is a 1-sample delay device, 62 is a multiplier (h (0) to h (N) is a multiplication value) for convolving the impulse response, and 63 is an adder for adding the outputs from the multiplier 62, respectively.
【０００５】[0005]
【発明が解決しようとする課題】ところが、以上のよう
に構成された従来のヘッドホン再生装置によれば、例え
ばサンプリング周波数が４４１００Ｈｚでサンプリング
されたデジタル入力信号に伝達関数を畳み込む場合、１
秒間のインパルス応答（伝達関数）を畳み込むために、
遅延、乗算、加算を各々４４１００回行う必要があっ
た。更に、部屋の反射音を考慮した残響特性も再現しよ
うとする場合、その伝達関数の時間的長さが長くなるた
め、用いるＦＩＲ型デジタルフィルタ６０の点数を増大
する必要があった。つまり、ＤＳＰ等を用いるハードウ
エアではその規模が膨大となるため実現が難しいという
問題点があった。However, according to the conventional headphone reproducing apparatus configured as described above, when the transfer function is convolved with the digital input signal sampled at the sampling frequency of 44100 Hz, for example, 1
To convolve the impulse response (transfer function) of seconds,
It was necessary to perform delay, multiplication, and addition 44100 times each. Furthermore, when the reverberation characteristic considering the reflected sound of the room is also to be reproduced, the time length of the transfer function becomes long, so that it is necessary to increase the number of FIR digital filters 60 to be used. In other words, there is a problem that hardware that uses a DSP or the like is difficult to realize because its scale becomes huge.
【０００６】また、特開平３−２５０８９９号公報に
は、より簡単な構成で音像の頭外定位を実現しようとす
るヘッドホン再生装置が開示されている。これは、モノ
ラルの入力信号から反射音（遅延手段と乗算手段とによ
り入力信号から生成される遅延時間及びレベルの異なる
複数の反射音）を生成し、入力信号に反射音を付加した
後の信号から左用、右用のクロストーク信号を生成し、
入力信号に反射音とクロストーク信号とを左右別に加算
してヘッドホンで左右独立に再生するものである。詳細
には、遅延手段と乗算手段とから構成された２個の反射
音生成手段（左耳への反射音生成手段及び右耳への反射
音生成手段）を有し、入力信号に夫々異なる反射音（左
耳への複数の反射音及び右耳への複数の反射音）を付加
した２つの信号（左用、右用）を生成する。そしてこの
２つの信号の内、左用の信号から右用のフィルタを介し
て右用のクロストーク信号、右用の信号から左用のフィ
ルタを介して左用のクロストーク信号を夫々生成し、入
力信号に反射音とクロストーク信号とを左右別に加算し
てヘッドホンで再生するヘッドホン再生装置が開示され
ている。また、１個の反射音生成手段により、入力信号
に反射音を付加した信号を２つの信号に分岐させ、左右
に加算すると共に（つまり、左耳への反射音と右耳への
反射音とを同じものとしている）、入力信号に反射音を
付加した信号から左右別のフィルタを介して、左用のク
ロストーク信号、右用のクロストーク信号を夫々生成
し、入力信号に反射音とクロストーク信号とを左右別に
加算してヘッドホンで再生するヘッドホン再生装置が開
示されている。Further, Japanese Laid-Open Patent Publication No. 3-250899 discloses a headphone reproducing device for realizing out-of-head localization of a sound image with a simpler structure. This is a signal after a reflected sound (a plurality of reflected sounds having different delay times and levels generated from the input signal by the delay means and the multiplication means) is generated from the monaural input signal, and the reflected sound is added to the input signal. To generate the left and right crosstalk signals from
The reflected sound and the crosstalk signal are added to the input signal separately for left and right, and the left and right are reproduced independently by the headphones. In detail, it has two reflected sound generating means (a reflected sound generating means for the left ear and a reflected sound generating means for the right ear) composed of a delay means and a multiplying means, and the reflected sound is different for each input signal. Two signals (for left and for right) to which sound (a plurality of reflected sounds to the left ear and a plurality of reflected sounds to the right ear) are added are generated. Of these two signals, a left signal is generated from the left signal through the right filter, a right crosstalk signal is generated, and a right signal is generated from the left crosstalk signal through the left filter. There is disclosed a headphone reproducing device that adds reflected sound and a crosstalk signal to the left and right and reproduces them by headphones. In addition, one reflected sound generation unit branches the signal obtained by adding the reflected sound to the input signal into two signals and adds them to the left and right (that is, the reflected sound to the left ear and the reflected sound to the right ear). , The left crosstalk signal and the right crosstalk signal are generated from the input signal plus the reflected sound through the left and right filters, respectively, and the reflected sound and crosstalk are added to the input signal. There is disclosed a headphone reproducing device that adds a signal to the left and right and adds the signals to the headphone to reproduce.
【０００７】つまり、これらのヘッドホン再生装置は、
例えば左耳には、左用の反射音を付加された信号と、右
用の反射音を付加された信号から生成された左用のクロ
ストーク信号とをモノラル入力信号に加算して再生する
という簡易的な構成になっている。ところが、このよう
な構成では、反射音は入力信号を遅延時間及びレベルの
みを変えて複数生成されるもので、方向感（伝達特性）
は合成されていなく左右の耳への明確な方向感を持たず
に入力信号にそのまま加算されている。又、反射音から
生成されるクロストーク信号は、１本１本の反射音夫々
に対して生成されるのでなく、複数の反射音が付加され
た１つの信号に対して左右別に生成されている。従っ
て、多少の広がりが出るものの、複数生成される反射音
は、１本１本の反射音として何等処理が施されていない
ので１本１本の反射音の方向感や、音源の明確な方向感
を得ることはできなく、現実の部屋とは異なる音場が再
生されてしまい、現実感ある音像の頭外定位が実現でき
ないという問題があった。更に、音像を頭外に定位させ
るために、左右の信号間に相関がなくなるように位相の
制御を行うようにした構成のものでは、音像の定位が不
明確になり、音源の方向感も不明確になってしまうとい
う問題があった。That is, these headphone reproducing devices are
For example, in the left ear, a signal to which the reflected sound for the left is added and a crosstalk signal for the left generated from the signal to which the reflected sound for the right are added are added to the monaural input signal and reproduced. It has a simple structure. However, in such a configuration, a plurality of reflected sounds are generated by changing only the delay time and the level of the input signal, and the sense of direction (transfer characteristic) is generated.
Is not synthesized and is added to the input signal as it is without having a clear sense of direction to the left and right ears. Further, the crosstalk signal generated from the reflected sound is not generated for each reflected sound individually, but is generated for each of the left and right signals with respect to one signal to which a plurality of reflected sounds are added. . Therefore, although there is some spread, the multiple reflected sounds that have been generated are not processed as individual reflected sounds, so there is a sense of direction of each reflected sound and a clear direction of the sound source. There is a problem that it is not possible to obtain a feeling, and a sound field different from that in a real room is reproduced, so that a realistic out-of-head localization of a sound image cannot be realized. Furthermore, in order to localize the sound image out of the head, in the configuration in which the phase is controlled so that the correlation between the left and right signals is eliminated, the localization of the sound image becomes unclear and the sense of direction of the sound source is also unclear. There was a problem that it became clear.
【０００８】また、これらのような従来のヘッドホン再
生装置では、聴取者が頭部を動かすとそれに伴って音源
の定位位置も移動してしまい、不自然さがあり、現実感
に欠けるという問題があった。Further, in the conventional headphone reproducing apparatus as described above, when the listener moves his / her head, the localization position of the sound source also moves, which is unnatural and unrealistic. there were.
【０００９】そこで、本発明は上記の点に着目してなさ
れたものであり、小規模のハードウエアで、音源の方向
感（伝達特性）を合成し、音像を頭外に定位させるヘッ
ドホン再生装置を提供することを目的とするものであ
る。Therefore, the present invention has been made by paying attention to the above points, and a headphone reproducing apparatus for synthesizing a sense of direction (transmission characteristic) of a sound source with a small-scale hardware to localize a sound image outside the head. It is intended to provide.
【００１０】[0010]
【課題を解決するための手段】本発明は、上記目的を達
成するための手段として、信号を遅延させる遅延手段
と、信号の周波数特性を補正する周波数特性補正手段
と、信号の音量レベルを補正する音量補正手段とを直列
に接続して構成した伝達特性合成手段を備え、この伝達
特性合成手段により、入力信号から分岐された左チャン
ネル信号、右チャンネル信号夫々に、仮想音源と聴取者
の左耳、右耳との間の夫々の伝達特性を合成することを
特徴とするヘッドホン再生装置を提供する。As a means for achieving the above object, the present invention provides a delay means for delaying a signal, a frequency characteristic correcting means for correcting the frequency characteristic of the signal, and a volume level of the signal. And a transfer characteristic synthesizing unit configured to be connected in series with the sound volume correcting unit. By the transfer characteristic synthesizing unit, the virtual sound source and the left side of the listener are respectively added to the left channel signal and the right channel signal branched from the input signal. Provided is a headphone reproducing device characterized by synthesizing transfer characteristics between an ear and a right ear.
【００１１】また、前記入力信号を遅延させて前記仮想
的な空間での複数の反射音を生成して出力する反射音生
成遅延手段と、前記遅延手段と、前記周波数特性補正手
段と、前記音量補正手段とを直列に接続して構成した、
前記反射音生成遅延手段から出力される前記複数の反射
音夫々から分岐された左チャンネル信号、右チャンネル
信号夫々に、前記複数の反射音夫々の前記聴取者の左
耳、右耳への夫々の伝達特性を合成する反射音伝達特性
合成手段と、前記伝達特性合成手段の左チャンネル信号
出力、右チャンネル信号出力夫々と、前記反射音伝達特
性合成手段の左チャンネル信号出力、右チャンネル信号
出力夫々とを加算する加算器とを備えたことを特徴とす
るヘッドホン再生装置を提供する。Further, a reflected sound generation delay means for delaying the input signal to generate and output a plurality of reflected sounds in the virtual space, the delay means, the frequency characteristic correction means, and the volume. It is configured by connecting the correction means in series,
For each of the left channel signal and the right channel signal branched from each of the plurality of reflected sounds output from the reflected sound generation delay unit, the left ear and the right ear of the listener of each of the plurality of reflected sounds are output. Reflected sound transfer characteristic synthesizing means for synthesizing transfer characteristics, left channel signal output and right channel signal output of the transfer characteristic synthesizing means, left channel signal output and right channel signal output of the reflected sound transfer characteristic synthesizing means, respectively. The present invention provides a headphone reproducing device including an adder for adding the.
【００１２】また、聴取者の位置、向き又は動きを検出
する検出手段と、前記検出手段により検出された聴取者
の位置、向き又は動きに応じて、音像を移動させるよう
に、前記遅延手段、前記周波数特性補正手段及び前記音
量補正手段における信号処理値の内少なくとも１つを変
化させる制御手段とを備えたことを特徴とするヘッドホ
ン再生装置を提供する。Further, the detecting means for detecting the position, orientation or movement of the listener, and the delay means for moving the sound image according to the position, orientation or movement of the listener detected by the detecting means, There is provided a headphone reproducing device comprising: a frequency characteristic correction means and a control means for changing at least one of signal processing values in the volume correction means.
【００１３】[0013]
【実施例】以下、添付図面を参照して本発明の実施例を
説明する。図１は、本発明のヘッドホン再生装置の第一
の実施例を示すブロック図である。同図において、ヘッ
ドホン再生装置１０は、仮想的な空間に想定する仮想音
源から聴取者の左右の耳への伝達関数に含まれる音響的
要素をモデル化し、方向感（伝達特性）を合成する方向
フィルタ（伝達特性合成手段）１２を有する。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing a first embodiment of a headphone reproducing device of the present invention. In the figure, the headphone reproducing device 10 models acoustic elements included in a transfer function from a virtual sound source assumed in a virtual space to the left and right ears of a listener, and synthesizes a sense of direction (transfer characteristic). It has a filter (transfer characteristic synthesizing means) 12.
【００１４】この音響的要素は、時間的要素、周波数的
要素及び音圧的要素を用い、これらについて説明する。 （１）時間的要素（音源から聴取者の耳へ届く音の到達
時間の差）。 時間的要素とは、音源と耳との距離差に起因する音の到
達時間差による伝達関数の音響的要素であり、聴取者に
対する仮想音源の角度、距離に応じて、適当な時間の遅
延を用いることにより、この時間的要素を合成する。例
えば、左右の耳の間では、仮想音源から遠い距離の耳へ
の伝達特性を、近い距離の耳への伝達特性より、適当な
時間遅延させる。As the acoustic element, a temporal element, a frequency element, and a sound pressure element will be described and explained. (1) Temporal element (difference in arrival time of sound that reaches the listener's ear from a sound source). The temporal element is the acoustic element of the transfer function due to the arrival time difference of the sound caused by the difference in distance between the sound source and the ear, and an appropriate time delay is used according to the angle and distance of the virtual sound source with respect to the listener. Thus, this temporal element is synthesized. For example, between the left and right ears, the transfer characteristic from the virtual sound source to the ear at a long distance is delayed by an appropriate time from the transfer characteristic to the ear at a short distance.
【００１５】（２）周波数的要素（音源から耳へ届く音
の周波数特性の差）。 周波数的要素とは、音源と耳と頭との位置関係に起因す
る周波数特性差による伝達関数の音響的要素である。一
般的に、左右の耳の内、音源から遠い位置にある耳に
は、音が頭部の影に回って耳に到達するため、高域が減
衰する周波数特性傾向を示す。そこで、聴取者に対する
仮想音源の角度、距離等に応じて、伝達特性の周波数特
性を高域減衰させることにより、この周波数的要素を合
成する。例えば、左右の耳の間では、仮想音源から遠い
距離の耳への伝達特性の周波数特性を、近い耳への伝達
特性の周波数特性より高域を減衰させる。(2) Frequency component (difference in frequency characteristics of sound reaching the ear from a sound source). The frequency element is an acoustic element of the transfer function due to the difference in frequency characteristics caused by the positional relationship between the sound source and the ear and the head. In general, in the left and right ears, which are far from the sound source, the sound reaches the ears around the shadow of the head, and therefore, the frequency characteristic tends to be attenuated in the high frequency range. Therefore, this frequency element is synthesized by attenuating the frequency characteristic of the transfer characteristic in the high frequency range according to the angle, distance, etc. of the virtual sound source with respect to the listener. For example, between the left and right ears, the frequency characteristic of the transfer characteristic to the ear at a distance from the virtual sound source is attenuated in a higher range than the frequency characteristic of the transfer characteristic to the near ear.
【００１６】（３）音圧的要素（音源から耳へ届く音の
レベル差）。 音圧的要素とは、音源と耳との距離差に起因するレベル
差による伝達関数の音響的要素であり、聴取者に対する
仮想音源の角度、距離等に応じて、伝達特性のレベルを
上げ、又は下げることにより、この音圧的要素を合成す
る。例えば、左右の耳の間では、仮想音源から遠い距離
の耳への伝達特性のレベルを、近い耳への伝達特性のレ
ベルより小さくさせる。(3) Sound pressure element (difference in level of sound reaching the ear from a sound source). The sound pressure element is an acoustic element of the transfer function due to the level difference caused by the distance difference between the sound source and the ear, and raises the level of the transfer characteristic according to the angle of the virtual sound source to the listener, the distance, etc. Or, by lowering it, this sound pressure element is synthesized. For example, between the left and right ears, the level of the transfer characteristic to the ear far away from the virtual sound source is made smaller than the level of the transfer characteristic to the near ear.
【００１７】これら３つの音響的要素を用いて仮想音源
から左右の耳までの伝達特性が合成され、伝達特性の時
間的要素をモデル化する遅延手段と、周波数的要素をモ
デル化する周波数特性補正手段と、音圧的要素をモデル
化する音量補正手段とにより構成できる。例えば、ＤＳ
Ｐ等のデジタル信号処理回路により実現しようとする場
合、方向フィルタ１２は遅延器、ＬＰＦ（低域通過型フ
ィルタ）、乗算器から容易に構成できる。またＬＰＦ
は、ハードウエア規模の小さいＩＩＲ型デジタルフィル
タを用いることができる。Transfer characteristics from the virtual sound source to the left and right ears are synthesized by using these three acoustic elements, and delay means for modeling a temporal element of the transfer characteristics and frequency characteristic correction for modeling a frequency element. And sound volume correction means for modeling the sound pressure element. For example, DS
When it is intended to be realized by a digital signal processing circuit such as P, the directional filter 12 can be easily composed of a delay device, an LPF (low-pass filter), and a multiplier. LPF
Can use an IIR type digital filter with a small hardware scale.
【００１８】入力端子１１から入力された１チャンネル
入力信号は、方向フィルタ１２へ入力され、左チャンネ
ル信号及び右チャンネル信号に分岐される。方向フィル
タ１２は、左チャンネル用、右チャンネル用夫々の、遅
延器１３Ｌ，１３Ｒ、ＬＰＦ１４Ｌ，１４Ｒ、乗算器１
５Ｌ，５Ｒが夫々直列に接続されている。左チャンネル
信号、右チャンネル信号は夫々、遅延器１３Ｌ，１３Ｒ
により所望の時間遅延され、ＬＰＦ１４Ｌ，１４Ｒによ
り所望の周波数特性に補正され、乗算器１５Ｌ，１５Ｒ
により所望の音量レベルに補正され、ヘッドホン１６の
左チャンネル１６Ｌ、右チャンネル１６Ｒへ夫々出力さ
れる。The 1-channel input signal input from the input terminal 11 is input to the directional filter 12 and branched into a left channel signal and a right channel signal. The directional filter 12 includes delay devices 13L and 13R, LPFs 14L and 14R, and a multiplier 1 for the left channel and the right channel, respectively.
5L and 5R are connected in series, respectively. The left channel signal and the right channel signal are delay devices 13L and 13R, respectively.
Is delayed by a desired time by the LPFs 14L and 14R and is corrected to a desired frequency characteristic by the multipliers 15L and 15R.
Is corrected to a desired sound volume level and output to the left channel 16L and the right channel 16R of the headphone 16, respectively.
【００１９】なお、遅延器１３Ｌ，１３Ｒ、ＬＰＦ１４
Ｌ，１４Ｒ、乗算器１５Ｌ，５Ｒは、左チャンネル用、
右チャンネル用で夫々直列に接続されていればその順序
は関係ない。また、夫々の所望の信号処理値は、上述し
たように、仮想音源と聴取者との位置関係により設定さ
れる。また、ＬＰＦ１４Ｌ，１４Ｒとして用いるＩＩＲ
型デジタルフィルタの順方向の係数をスケーリングする
ことで、特に乗算器を別に設けることなく音圧的要素を
モデル化することができる。The delay devices 13L, 13R and the LPF 14
L, 14R and multipliers 15L, 5R are for the left channel,
The order does not matter if they are connected in series for the right channel. Further, each desired signal processing value is set by the positional relationship between the virtual sound source and the listener, as described above. IIR used as LPF 14L, 14R
By scaling the coefficient in the forward direction of the type digital filter, it is possible to model the sound pressure element without providing an additional multiplier.
【００２０】以上のようにしてヘッドホン１６で再生さ
れる信号は、仮想音源から左耳、右耳へ夫々方向感をも
った音として再生される。従って、このヘッドホン再生
装置１０によれば、あたかも、頭外の仮想音源の方向か
ら音が聞こえるように感じられ、音像が頭外に定位する
（スピーカによる再生を疑似的に実現できる）ので、長
時間の聴取においても疲労感は少ない。また、遅延器
（遅延手段）と、ＬＰＦ（周波数特性補正手段）と、乗
算器（音量補正手段）とによって方向フィルタ（伝達特
性合成手段）を構成して伝達特性を合成するので、実際
の伝達関数により近い伝達特性を入力信号に対してリア
ルタイムで合成することができ、更には、従来のインパ
ルス応答の畳み込み演算を行うよりも、簡単な構成要素
の小規模なハードウエアによって構成することができ
る。The signal reproduced by the headphones 16 as described above is reproduced as sounds having a sense of direction from the virtual sound source to the left and right ears, respectively. Therefore, according to the headphone reproducing apparatus 10, it is as if a sound is heard from the direction of the virtual sound source outside the head, and the sound image is localized outside the head (reproduction by the speaker can be realized in a pseudo manner). There is little feeling of fatigue when listening to time. Further, the delay filter (delay means), the LPF (frequency characteristic correction means), and the multiplier (volume correction means) constitute a directional filter (transfer characteristic synthesizing means) to synthesize the transfer characteristic, so that the actual transmission is performed. A transfer characteristic closer to a function can be synthesized in real time with respect to an input signal, and further, it can be configured by a small-scale hardware having simple components as compared with the conventional convolution calculation of impulse response. .
【００２１】次に、本発明の第二の実施例について説明
する。図２は、本発明のヘッドホン再生装置の第二の実
施例を示すブロック図である。音像の知覚には、聴取者
の両耳間差だけでなく、音源が設置されている部屋の反
射音、残響なども手掛かりとなっている。また、部屋の
響きからその部屋の大きさを経験的に判断し、その部屋
の大きさとの相対関係からも音源の位置を認識すること
もできる。つまり、部屋の反射音構造は音源の認識に大
きく影響するものであり、ヘッドホンによる音像の頭外
定位再生においても反射音の付加は音源の認識に大きく
影響し、更に反射音に方向感をもたせれば、音源の認識
が容易となる。そこで、ヘッドホン再生装置２０は、残
響特性のある部屋に仮想音源を想定し、仮想音源から聴
取者の両耳への方向感をもつ直接音に加えて、仮想的な
部屋の壁などにより反射されて聴取者の両耳への方向感
をもつ複数の反射音を再生しようとするものである。Next, a second embodiment of the present invention will be described. FIG. 2 is a block diagram showing a second embodiment of the headphone reproducing device of the present invention. The perception of the sound image is not only the binaural difference of the listener, but also the reflected sound and reverberation of the room where the sound source is installed. It is also possible to empirically determine the size of the room from the sound of the room and to recognize the position of the sound source from the relative relationship with the size of the room. In other words, the reflected sound structure of the room greatly affects the recognition of the sound source, and the addition of the reflected sound greatly affects the recognition of the sound source even in the out-of-head localization of the sound image with headphones, and further gives the reflected sound a sense of direction. Then, the sound source can be easily recognized. Therefore, the headphone reproducing device 20 assumes a virtual sound source in a room having reverberation characteristics, and in addition to direct sound having a sense of direction from the virtual sound source to the listener's ears, it is reflected by a wall of the virtual room or the like. It is intended to reproduce a plurality of reflected sounds having a sense of direction to both ears of the listener.
【００２２】まず、入力端子２１からの１チャンネル入
力信号は２つに分岐され、一方は、上述したような方向
フィルタ１２により、左耳、右耳夫々への方向感をもつ
直接音として出力される。また、他方は、遅延器２２に
より、異なる遅延時間（ｔ1 〜ｔN ）で多段に信号が出
力され、夫々の信号が方向フィルタ（反射音伝達特性合
成手段）１２（ｔ1 ）〜１２（ｔN ）により、左耳、右
耳夫々への方向感をもつ反射音として出力される。ここ
で、方向フィルタ１２（ｔ1 ）〜１２（ｔN ）は、上述
した方向フィルタ１２と同様の構成からなり、その信号
処理値は、夫々の反射音の方向により設定される。そし
て、直接音と反射音との、左チャンネル信号、右チャン
ネル信号が夫々、加算器２４により加算され、ヘッドホ
ン１６の左チャンネル１６Ｌ、右チャンネル１６Ｒ夫々
に送られる。First, a 1-channel input signal from the input terminal 21 is branched into two, and one of them is output as a direct sound having a sense of direction to each of the left and right ears by the directional filter 12 as described above. It On the other hand, the delay device 22 outputs signals in multiple stages with different delay times (t 1 to t N ), and the respective signals are directional filters (reflected sound transfer characteristic synthesizing means) 12 (t 1 ) to 12 ( t N ) is output as a reflected sound having a sense of direction to each of the left and right ears. Here, the directional filters 12 (t 1 ) to 12 (t N ) have the same configuration as the directional filter 12 described above, and the signal processing value thereof is set according to the direction of each reflected sound. Then, the left channel signal and the right channel signal of the direct sound and the reflected sound are respectively added by the adder 24 and sent to the left channel 16L and the right channel 16R of the headphones 16.
【００２３】従って、ヘッドホン１６では、仮想音源か
ら左耳、右耳夫々への方向感をもった直接音と、部屋の
壁などで反射された反射音とが再生される。つまり、音
像が頭内に定位することなく、頭外に定位し、あたかも
残響特性のある部屋に設置された音源から音が聞こえて
くるように感じられる。また、方向フィルタ１２，１２
（ｔ1 ）〜１２（ｔN ）は簡単な構成要素で実現できる
ため、小規模なハードウエアで構成できる。Therefore, the headphone 16 reproduces a direct sound having a sense of direction from the virtual sound source to each of the left and right ears, and a reflected sound reflected by the wall of the room. In other words, the sound image is localized outside the head without being localized inside the head, and it is as if the sound is heard from a sound source installed in a room with reverberation characteristics. Also, the directional filters 12, 12
Since (t 1 ) to 12 (t N ) can be realized with simple components, they can be configured with small-scale hardware.
【００２４】上述した特開平３−２５０８９９号公報に
開示されている従来のヘッドホン再生装置に比しては、
伝達特性合成手段（方向フィルタ１２）により、入力信
号から分岐された左チャンネル信号、右チャンネル信号
夫々に、仮想音源と聴取者の左耳、右耳との間の夫々の
伝達特性を合成すると共に、反射音伝達特性合成手段
｛方向フィルタ１２（ｔ1 ）〜１２（ｔN ）｝により、
反射音生成遅延手段から出力される複数の反射音夫々か
ら分岐された左チャンネル信号、右チャンネル信号夫々
に、１本１本の反射音夫々の聴取者の左耳、右耳への夫
々の伝達特性を合成し、伝達特性合成手段の左チャンネ
ル信号出力、右チャンネル信号出力夫々と、反射音伝達
特性合成手段の左チャンネル信号出力、右チャンネル信
号出力夫々とを加算するように構成し、１個の仮想音源
から夫々左右の耳への方向感を合成すると共に、複数の
反射音を生成し、１本１本の反射音に対して、夫々左右
の耳への異なる方向感を合成する点が異なり、仮想音源
の方向感が明確に得られ、現実の部屋のように空間的な
音場で聴いている時のような現実感ある音像の頭外定位
感が得られる。Compared with the conventional headphone reproducing device disclosed in the above-mentioned Japanese Patent Laid-Open No. 3-250899,
The transfer characteristic synthesizing means (directional filter 12) synthesizes the left channel signal and the right channel signal branched from the input signal with the respective transmission characteristics between the virtual sound source and the listener's left and right ears. , Reflected sound transfer characteristic synthesizing means {direction filters 12 (t 1 ) to 12 (t N )}
Each of the left channel signal and the right channel signal branched from each of the plurality of reflected sounds output from the reflected sound generation delay means is transmitted to the left ear and the right ear of the listener of each reflected sound. The characteristics are synthesized, and the left channel signal output and the right channel signal output of the transfer characteristic synthesizing means are added to the left channel signal output and the right channel signal output of the reflected sound transmission characteristic synthesizing means, respectively. In addition to synthesizing the sense of direction to the left and right ears from each virtual sound source, multiple reflected sounds are generated, and different senses of direction to the left and right ears are synthesized for each reflected sound. In contrast, the sense of direction of the virtual sound source can be clearly obtained, and the out-of-head localization of a realistic sound image can be obtained as when listening in a spatial sound field like a real room.
【００２５】なお、音源となる入力信号がステレオ信号
の場合には、例えば、上述のようなヘッドホン再生装置
を入力信号の夫々のチャンネルに対して構成して信号処
理を行い、夫々のチャンネルから聴取者の左耳及び右耳
への方向感をもった音響信号（直接音及び反射音）を合
成し、ヘッドホンに送ればよく、頭外にステレオ感よく
音像が定位される。更に、入力信号が３以上の複数の場
合も同様であって、任意の入力信号に対して上述のよう
なヘッドホン再生装置を構成して、任意の入力信号の音
像を頭外の任意の位置に定位させることができる。When the input signal serving as a sound source is a stereo signal, for example, the headphone reproducing apparatus as described above is configured for each channel of the input signal to perform signal processing and listen from each channel. The sound signals (direct sound and reflected sound) having a sense of direction to the left and right ears of the person may be combined and sent to the headphones, and the sound image is localized outside the head with a good sense of stereo. Further, the same applies to the case where the number of input signals is three or more, and the headphone reproducing apparatus as described above is configured for an arbitrary input signal so that the sound image of the arbitrary input signal is output to an arbitrary position outside the head. Can be localized.
【００２６】なお、信号処理されていない元の信号を、
処理された信号に加えてヘッドホンに送ってもよい。そ
の時、信号処理されていない信号と、処理された信号と
のレベル差により音像の定位感を変化させることができ
る。また、信号処理値を適当に変化させることで、音像
の定位感（仮想音源の位置、仮想音源のある部屋の形態
等）を任意に変化させることも容易に考えられる。変化
させる信号処理値は、方向フィルタ１２，１２（ｔ1 〜
ｔN ），遅延器２２におけるあらゆる信号処理値を変化
させてもよく、より多くの信号処理値を変化させればよ
り明確に音像の定位感を変化させることができるし、変
化させる信号処理値を少なくすれば装置を簡略化でき
る。更に、信号処理値を序々に変化させることによっ
て、あたかも音像が移動しているかのような効果を得る
こともできる。The original signal that has not been processed is
It may be sent to headphones in addition to the processed signal. At that time, the sense of localization of the sound image can be changed by the level difference between the signal that has not been subjected to signal processing and the processed signal. It is also easily possible to arbitrarily change the sense of localization of the sound image (the position of the virtual sound source, the form of the room with the virtual sound source, etc.) by appropriately changing the signal processing value. The signal processing values to be changed are directional filters 12, 12 (t 1 ~
t N ), any signal processing value in the delay unit 22 may be changed. If more signal processing values are changed, the localization of the sound image can be changed more clearly, and the signal processing values to be changed can be changed. If the number is reduced, the device can be simplified. Furthermore, by gradually changing the signal processing value, it is possible to obtain an effect as if the sound image were moving.
【００２７】次に、本発明の第三の実施例について説明
する。図３は、本発明のヘッドホン再生装置の第三の実
施例を示すブロック図である。 同図において、図２に
示したヘッドホン再生装置２０の構成要素と同様の構成
要素には同じ符号を付してその説明を省略する。ヘッド
ホン再生装置３０は、ヘッドホン１６に設けられた聴取
者の頭部の動きを検出する動き検出手段３１により、聴
取者の頭部の動き方向（回転方向）、動き量（回転角）
等が検出されＣＰＵ等のコントローラ（制御手段）３２
に送られる。なお、コントローラ３２で聴取者の頭部の
動きを演算して検出するようにしてもよい。コントロー
ラ３２では、その聴取者の頭部の動き方向と逆の方向へ
同じ動き量で音像を移動させるよう方向フィルタ（伝達
特性合成手段）１２、遅延器（反射音生成遅延手段）２
２、方向フィルタ（反射音伝達特性合成手段）１２（ｔ
1 ）〜１２（ｔN ）の信号処理値を変化させる。Next, a third embodiment of the present invention will be described. FIG. 3 is a block diagram showing a third embodiment of the headphone reproducing device of the present invention. In the figure, the same components as those of the headphone reproducing apparatus 20 shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. In the headphone reproducing device 30, the movement direction (rotation direction) and the movement amount (rotation angle) of the listener's head are detected by the motion detection means 31 provided in the headphones 16 for detecting the movement of the listener's head.
Etc. are detected and a controller (control means) 32 such as a CPU
Sent to The controller 32 may calculate and detect the movement of the listener's head. In the controller 32, a directional filter (transfer characteristic synthesizing means) 12 and a delay device (reflected sound generation delaying means) 2 so as to move the sound image with the same amount of movement in a direction opposite to the direction of movement of the listener's head.
2, direction filter (reflected sound transfer characteristic synthesizing means) 12 (t
The signal processing value of 1 ) to 12 (t N ) is changed.
【００２８】動き検出手段３１としては、様々な手段が
考えられるが、例えば超音波等を用いたセンサを用いる
ことができ、ヘッドホン１６の左右に個別の２つのセン
サを設置し、頭部から離れた所定の位置に検出用信号発
信器を設置する。発信器からは送出タイミングをコント
ロールしながら例えばパルス状の検出用信号を送出す
る。左右夫々のセンサはこの検出用信号を受信すると、
その検出時刻をコントローラ３２に出力する。コントロ
ーラ３２では、発信器から送られる検出用信号発信時刻
と、夫々のセンサから送られる検出用信号受信時刻との
差から、発信器とヘッドホン１６の左右との距離又は距
離差を検出し、頭部の回転角を算出する。更にヘッドホ
ン１６の他の箇所（例えば頭上部）にセンサを設けて三
次元的に方向を検出することも容易に考えられ、頭部の
三次元的な動きにも対応するように構成してもよい。ま
た、動き検出手段３１の他の手段として、赤外線セン
サ、ジャイロセンサ、垂直方向に対する傾きを検出する
重力を利用したセンサ等も用いることができる。Although various means can be considered as the motion detecting means 31, for example, a sensor using ultrasonic waves or the like can be used, and two separate sensors are installed on the left and right of the headphone 16 and separated from the head. Install the detection signal transmitter at the specified position. For example, a pulse-shaped detection signal is transmitted from the transmitter while controlling the transmission timing. When the left and right sensors receive this detection signal,
The detection time is output to the controller 32. The controller 32 detects the distance or the distance difference between the transmitter and the left and right of the headphones 16 from the difference between the detection signal transmission time sent from the transmitter and the detection signal reception time sent from each sensor. The rotation angle of the part is calculated. Further, it is easily conceivable to provide a sensor at another portion of the headphone 16 (for example, the upper part of the head) to detect the direction three-dimensionally, and the headphone 16 may be configured to correspond to the three-dimensional movement of the head. Good. Further, as other means of the motion detecting means 31, an infrared sensor, a gyro sensor, a sensor using gravity for detecting an inclination with respect to the vertical direction, or the like can be used.
【００２９】そして、コントローラ３２は、算出された
頭部の回転角から、その回転方向と逆方向へ同じ回転角
だけ音像を移動させるべく、例えば、コントローラ３２
等にあらかじめメモリーされた回転方向、回転角に応じ
た演算式や設定値により、遅延器２２、方向フィルタ１
２，１２（ｔ1 ）〜１２（ｔN ）の遅延器、ＬＰＦ、乗
算器の信号処理値を変化させる。Then, the controller 32 moves the sound image from the calculated rotation angle of the head in the opposite direction to the rotation direction by the same rotation angle, for example, the controller 32.
The delay device 22 and the directional filter 1 are stored in advance in a memory, etc. by the arithmetic expressions and set values corresponding to the rotation direction and the rotation angle.
The signal processing values of the delay device, LPF, and multiplier of 2, 12 (t 1 ) to 12 (t N ) are changed.
【００３０】図４は、聴取者の頭部が水平方向へ角度θ
だけ動いた場合の様子を示す図である。同図（ａ）にお
いて、ヘッドホン１６を装着した聴取者３３には、仮想
音源がＡ点に定位されているとする。今、聴取者３３の
頭部が水平右方向へ角度θだけ動いて同図（ｂ）の状態
になったとき、従来では仮想音源の定位位置も頭部の動
きと同様に動いてＢ点へと移動するが、ヘッドホン再生
装置３０では、仮想音源の定位位置を聴取者の頭部の動
き方向と逆方向（水平左方向）に角度θだけ移動させ
る。従って、仮想音源の定位位置をＡ点と同じ位置に位
置させることができる。つまり、聴取者３３が頭を動か
しても、仮想音源の頭外定位位置は変わらず現実感ある
音像の定位感を実現することができるから、より現実的
な音像の頭外定位感を得ることができる。In FIG. 4, the listener's head is horizontally angled by θ.
It is a figure which shows a mode when only moving. In FIG. 4A, it is assumed that the virtual sound source is localized at the point A for the listener 33 wearing the headphones 16. Now, when the listener's head moves horizontally rightward by an angle θ to the state shown in FIG. 7B, conventionally, the localization position of the virtual sound source also moves in the same manner as the head moves to point B. However, in the headphone reproducing apparatus 30, the localization position of the virtual sound source is moved by the angle θ in the direction opposite to the moving direction of the listener's head (horizontal left direction). Therefore, the localization position of the virtual sound source can be located at the same position as point A. That is, even if the listener 33 moves his or her head, the out-of-head localization position of the virtual sound source does not change, and a realistic sound image localization feeling can be realized, so that a more realistic out-of-head localization position of the sound image can be obtained. You can
【００３１】更に、頭部の動きのみでなく、仮想音源に
対する聴取者の位置及び向きも検出する位置、向き及び
動き検出手段を用いて、聴取者の位置、向き及び動きに
応じて、音像の定位感を変化させることにより、更に現
実感ある音像の頭外定位感が得られる。この位置、向き
及び動き検出手段としては、例えば、聴取者のいる空間
に３個以上の検出用信号発信器を配置し（同一平面上に
ないように４個以上配置すれば３次元的な位置、向き及
び動きが検出できる）、聴取者の頭部の左右（例えばヘ
ッドホンの左右）に２個の受信器を配置し、演算手段に
より、仮想音源に対する聴取者の位置、向き及び動きが
検出される。この演算手段では、各検出用信号発信器の
位置（座標）と、各検出用信号発信器から検出用信号を
発信した時間と、各受信器で各検出用信号を検出した時
間とより、各受信器の位置（聴取者の位置）を算出し、
各受信器間のベクトル、このベクトルを９０度回転した
聴取者の向きを示す向きベクトル、聴取者から（各受信
器間の中点から）仮想音源へのベクトルを求め、各受信
器間のベクトル又は向きベクトルと、聴取者から（各受
信器間の中点から）仮想音源へのベクトルとの内積か
ら、聴取者と仮想音源とのなす角度を求める。この位
置、向き及び動き検出手段によれば、仮想音源に対する
聴取者の位置、向き及び動きを容易かつ正確に検出する
ことができ、検出された聴取者の位置、向き及び動きに
応じて制御手段（コントローラ）により遅延器２２、方
向フィルタ１２，方向フィルタ１２（ｔ1 ）〜１２（ｔ
2 ）の信号処理値を変化させれば、仮想音源に対する聴
取者の位置、向き及び動きに応じて、より現実的に音像
の定位感を変化させることができる。Furthermore, by using not only the movement of the head but also the position and orientation of the listener with respect to the virtual sound source, the orientation and motion detection means are used to detect the sound image according to the position, orientation and movement of the listener. By changing the localization, a more realistic out-of-head localization of the sound image can be obtained. As the position, orientation and motion detecting means, for example, three or more detection signal transmitters are arranged in a space where a listener is present (three-dimensional position if four or more are arranged so as not to be on the same plane). , The direction and movement of the listener can be detected), two receivers are arranged on the left and right of the listener's head (for example, left and right of the headphones), and the position, orientation, and movement of the listener with respect to the virtual sound source are detected by the computing means. It In this computing means, the position (coordinates) of each detection signal transmitter, the time when the detection signal is transmitted from each detection signal transmitter, and the time when each detection signal is detected by each receiver, Calculate the position of the receiver (the position of the listener),
The vector between each receiver, the direction vector indicating the direction of the listener rotated by 90 degrees, the vector from the listener to the virtual sound source (from the midpoint between each receiver), and the vector between each receiver Alternatively, the angle formed by the listener and the virtual sound source is obtained from the inner product of the direction vector and the vector from the listener to the virtual sound source (from the midpoint between the receivers). According to the position, orientation and movement detection means, the position, orientation and movement of the listener with respect to the virtual sound source can be detected easily and accurately, and the control means depending on the detected position, orientation and movement of the listener. (Controller) delay device 22, directional filter 12, directional filter 12 (t 1 ) to 12 (t
By changing the signal processing value in 2 ), it is possible to more realistically change the localization of the sound image according to the position, orientation, and movement of the listener with respect to the virtual sound source.
【００３２】[0032]
【発明の効果】以上説明したように本発明のヘッドホン
再生装置によれば、仮想音源から聴取者の左耳、右耳夫
々への伝達特性（方向感）を合成するので、疑似的にス
ピーカによる再生を実現し、明確に音像が聴取者の頭外
に定位される。また、伝達特性（方向感）を合成した反
射音を付加するようにした構成では、残響のある部屋で
のスピーカの再生を疑似的に実現でき、より明確に音像
が頭外に定位される。また、伝達特性の合成は、遅延手
段と、周波数特性補正手段と、音量補正手段とで構成し
た伝達特性合成手段及び反射音伝達特性合成手段により
行うので、簡単な構成要素でより現実的な伝達特性を合
成することができ、小規模なハードウエアにより実現で
きる。特に周波数特性補正手段としてＬＰＦを用いれば
容易に構成できる。As described above, according to the headphone reproducing apparatus of the present invention, since the transmission characteristics (sense of direction) from the virtual sound source to the left ear and the right ear of the listener are combined, a pseudo speaker is used. Realizes reproduction, and the sound image is clearly localized outside the listener's head. In addition, with the configuration in which the reflected sound in which the transfer characteristic (direction sense) is combined is added, the reproduction of the speaker in the reverberant room can be pseudo-realized, and the sound image is localized more clearly outside the head. Further, since the transfer characteristics are synthesized by the transfer characteristic synthesizing means and the reflected sound transfer characteristic synthesizing means, which are composed of the delay means, the frequency characteristic correcting means, and the volume correcting means, more realistic transmission is possible with simple components. Properties can be combined and can be realized by small-scale hardware. In particular, it can be easily constructed by using an LPF as the frequency characteristic correcting means.
【００３３】また、伝達特性合成手段、反射音生成遅延
手段、反射音伝達特性合成手段における信号処理値を変
化させるように構成したものでは、簡単な構成で様々な
音場を実現できる。更には、音像があたかも移動してい
るような効果も得られる。また、聴取者の位置、向き又
は動きを検出する検出手段を備え、この検出手段によっ
て検出された聴取者の位置、向き又は動きに応じて伝達
特性合成手段、反射音生成遅延手段、反射音伝達特性合
成手段における信号処理値を変化させるように構成した
ものは、聴取者が移動しても、仮想音源の頭外定位位置
は変わらず現実感ある音像の定位感を実現することがで
きるから、より現実的な音像の頭外定位感を得ることが
できる。Further, in the structure in which the signal processing value in the transfer characteristic synthesizing means, the reflected sound generation delaying means, and the reflected sound transfer characteristic synthesizing means is changed, various sound fields can be realized with a simple structure. Furthermore, the effect that the sound image is moving can be obtained. Further, a detection means for detecting the position, orientation or movement of the listener is provided, and the transfer characteristic synthesizing means, reflected sound generation delay means, reflected sound transmission are provided according to the position, orientation or movement of the listener detected by this detection means. With the configuration configured to change the signal processing value in the characteristic synthesizing means, even if the listener moves, the out-of-head localization position of the virtual sound source does not change, and a realistic sound image localization feeling can be realized. It is possible to obtain a more realistic out-of-head localization of the sound image.
【図１】本発明のヘッドホン再生装置の第一の実施例を
示すブロック図である。FIG. 1 is a block diagram showing a first embodiment of a headphone reproducing device of the present invention.
【図２】本発明のヘッドホン再生装置の第二の実施例を
示すブロック図である。FIG. 2 is a block diagram showing a second embodiment of the headphone reproducing device of the present invention.
【図３】本発明のヘッドホン再生装置の第三の実施例を
示すブロック図である。FIG. 3 is a block diagram showing a third embodiment of the headphone reproducing device of the present invention.
【図４】聴取者が頭を水平方向へ角度θだけ動いた場合
の様子を示す図である。FIG. 4 is a diagram showing a state in which a listener moves his / her head horizontally by an angle θ.
【図５】スピーカにより音響信号を再生した場合の、ス
ピーカから聴取者の左右の耳への伝達特性を示す図であ
る。FIG. 5 is a diagram showing a transfer characteristic from the speaker to the left and right ears of a listener when an audio signal is reproduced by the speaker.
【図６】従来のヘッドホン再生装置を示すブロック図で
ある。FIG. 6 is a block diagram showing a conventional headphone reproducing device.
【図７】一般的なＦＩＲ型デジタルフィルタ（畳み込み
演算器）の構成を示すブロック図である。FIG. 7 is a block diagram showing a configuration of a general FIR type digital filter (convolution operation unit).
１０，２０，３０ ヘッドホン再生装置 １２ 方向フィルタ（伝達特性合成手段） １２（ｔ1 ）〜１２（ｔN ） 方向フィルタ（反射音伝
達特性合成手段） １３ 遅延器（遅延手段） １４ ＬＰＦ（周波数特性補正手段） １５ 乗算器（音量補正手段） １６ ヘッドホン ２２ 遅延器（反射音生成遅延手段） ２４ 加算器 ３１ 動き検出手段 ３２ コントローラ10, 20, 30 Headphone reproducing device 12 Directional filter (transfer characteristic synthesizing means) 12 (t 1 ) to 12 (t N ) Directional filter (reflected sound transfer characteristic synthesizing means) 13 Delay device (delaying means) 14 LPF (frequency characteristic) Correction means) 15 Multiplier (volume correction means) 16 Headphones 22 Delay device (reflected sound generation delay means) 24 Adder 31 Motion detection means 32 Controller
Claims (7)
数特性を補正する周波数特性補正手段と、信号の音量レ
ベルを補正する音量補正手段とを直列に接続して構成し
た伝達特性合成手段を備え、 この伝達特性合成手段により、入力信号から分岐された
左チャンネル信号、右チャンネル信号夫々に、仮想的な
空間に想定する仮想音源と聴取者の左耳、右耳との間の
夫々の伝達特性を合成することを特徴とするヘッドホン
再生装置。1. A transfer characteristic synthesizing means comprising a delay means for delaying a signal, a frequency characteristic correcting means for correcting the frequency characteristic of the signal, and a volume correcting means for correcting the volume level of the signal connected in series. With this transfer characteristic synthesizing means, the left channel signal and the right channel signal branched from the input signal are respectively transferred between the virtual sound source assumed in the virtual space and the left and right ears of the listener. A headphone reproducing device characterized by synthesizing characteristics.
て、 前記入力信号を遅延させて前記仮想的な空間での複数の
反射音を生成して出力する反射音生成遅延手段と、 前記遅延手段と、前記周波数特性補正手段と、前記音量
補正手段とを直列に接続して構成した、前記反射音生成
遅延手段から出力される前記複数の反射音夫々から分岐
された左チャンネル信号、右チャンネル信号夫々に、前
記複数の反射音夫々の前記聴取者の左耳、右耳への夫々
の伝達特性を合成する反射音伝達特性合成手段と、 前記伝達特性合成手段の左チャンネル信号出力、右チャ
ンネル信号出力夫々と、前記反射音伝達特性合成手段の
左チャンネル信号出力、右チャンネル信号出力夫々とを
加算する加算器とを備えたことを特徴とするヘッドホン
再生装置。2. The headphone reproducing apparatus according to claim 1, wherein the input sound signal is delayed to generate and output a plurality of reflected sounds in the virtual space, and the delay. Means, the frequency characteristic correcting means, and the sound volume correcting means are connected in series, and the left channel signal and the right channel branched from each of the plurality of reflected sounds output from the reflected sound generation delay means. Reflected sound transfer characteristic synthesizing means for synthesizing the respective transfer characteristics of the plurality of reflected sounds to the listener's left and right ears, respectively, and the left channel signal output and right channel of the transfer characteristic synthesizing means. A headphone reproducing apparatus comprising: a signal output; and an adder for adding the left channel signal output and the right channel signal output of the reflected sound transfer characteristic synthesizing means.
ィルタを用いたことを特徴とする請求項１又は請求項２
に記載のヘッドホン再生装置。3. The frequency characteristic correcting means uses a low-pass filter.
Headphone playback device described in.
び前記音量補正手段における信号処理値の内少なくとも
１つを変化させて音像の定位感を任意に変化させる制御
手段を備えたことを特徴とする請求項１〜請求項３の内
いずれか１項に記載のヘッドホン再生装置。4. A control means for changing at least one of signal processing values in the delay means, the frequency characteristic correction means, and the volume correction means to arbitrarily change a sense of localization of a sound image. The headphone reproducing device according to any one of claims 1 to 3.
延手段及び前記反射音伝達特性合成手段における信号処
理値の内少なくとも１つを変化させて音像の定位感を任
意に変化させる制御手段を備えたことを特徴とする請求
項２又は請求項３に記載のヘッドホン再生装置。5. Control means for changing at least one of the signal processing values in the transfer characteristic synthesizing means, the reflected sound generation delay means, and the reflected sound transfer characteristic synthesizing means to arbitrarily change the localization of the sound image. The headphone reproducing device according to claim 2 or 3, wherein the headphone reproducing device is provided.
出手段と、 前記検出手段により検出された聴取者の位置、向き又は
動きに応じて、音像を移動させるように、前記遅延手
段、前記周波数特性補正手段及び前記音量補正手段にお
ける信号処理値の内少なくとも１つを変化させる制御手
段とを備えたことを特徴とする請求項１〜請求項３の内
いずれか１項に記載のヘッドホン再生装置。6. Detecting means for detecting the position, orientation or movement of the listener, and the delay means for moving the sound image according to the position, orientation or movement of the listener detected by the detecting means. The headphone according to any one of claims 1 to 3, further comprising: a control unit that changes at least one of signal processing values in the frequency characteristic correction unit and the volume correction unit. Playback device.
出手段と、 前記検出手段により検出された聴取者の位置、向き又は
動きに応じて、音像を移動させるように、前記伝達特性
合成手段、前記反射音遅延生成手段及び前記反射音伝達
特性合成手段における信号処理値の内少なくとも１つを
変化させる制御手段とを備えたことを特徴とする請求項
２又は請求項３に記載のヘッドホン再生装置。7. Detecting means for detecting the position, orientation or movement of the listener, and said transfer characteristic composition so as to move the sound image according to the position, orientation or movement of the listener detected by said detecting means. The headphone according to claim 2 or 3, further comprising: means, a reflected sound delay generation means, and a control means for changing at least one of the signal processing values in the reflected sound transfer characteristic synthesizing means. Playback device.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7148323A JP2900985B2 (en) | 1994-05-31 | 1995-05-22 | Headphone playback device |
| EP96303604A EP0744881B1 (en) | 1995-05-22 | 1996-05-21 | Headphone reproducing apparatus |
| DE69632889T DE69632889T2 (en) | 1995-05-22 | 1996-05-21 | Player with headphones |
| MYPI96001922A MY124476A (en) | 1995-05-22 | 1996-05-22 | Headphone reproducing apparatus. |
| CN96108997.0A CN1108083C (en) | 1995-05-22 | 1996-05-22 | Headphone reproducing apparatus |
| SG9609852A SG89238A1 (en) | 1995-05-22 | 1996-05-22 | Headphone reproducing apparatus |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14101594 | 1994-05-31 | ||
| JP6-141015 | 1994-12-28 | ||
| JP6-339719 | 1994-12-28 | ||
| JP33971994 | 1994-12-28 | ||
| JP7148323A JP2900985B2 (en) | 1994-05-31 | 1995-05-22 | Headphone playback device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08237790A true JPH08237790A (en) | 1996-09-13 |
| JP2900985B2 JP2900985B2 (en) | 1999-06-02 |
Family
ID=27318163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7148323A Expired - Lifetime JP2900985B2 (en) | 1994-05-31 | 1995-05-22 | Headphone playback device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2900985B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002085831A (en) * | 2000-09-20 | 2002-03-26 | Namco Ltd | Game machine and information storage medium |
| JP2009543479A (en) * | 2006-07-07 | 2009-12-03 | ハリス コーポレイション | Method for transmitting binaural information to a user and binaural sound system |
| JP2010056589A (en) * | 2008-08-26 | 2010-03-11 | Sony Corp | Sound processing apparatus, sound image localization position adjusting method, video processing apparatus and video processing method |
| JP2012502550A (en) * | 2008-09-04 | 2012-01-26 | ディーティーエス・インコーポレイテッド | Interaural time delay recovery system and method |
| JP2021519012A (en) * | 2018-04-09 | 2021-08-05 | ドルビー・インターナショナル・アーベー | Methods, devices and systems for 3 degrees of freedom (3DOF +) expansion of MPEG-H 3D audio |
-
1995
- 1995-05-22 JP JP7148323A patent/JP2900985B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002085831A (en) * | 2000-09-20 | 2002-03-26 | Namco Ltd | Game machine and information storage medium |
| JP2009543479A (en) * | 2006-07-07 | 2009-12-03 | ハリス コーポレイション | Method for transmitting binaural information to a user and binaural sound system |
| JP4916547B2 (en) * | 2006-07-07 | 2012-04-11 | ハリス コーポレイション | Method for transmitting binaural information to a user and binaural sound system |
| JP2010056589A (en) * | 2008-08-26 | 2010-03-11 | Sony Corp | Sound processing apparatus, sound image localization position adjusting method, video processing apparatus and video processing method |
| US8472653B2 (en) | 2008-08-26 | 2013-06-25 | Sony Corporation | Sound processing apparatus, sound image localized position adjustment method, video processing apparatus, and video processing method |
| JP2012502550A (en) * | 2008-09-04 | 2012-01-26 | ディーティーエス・インコーポレイテッド | Interaural time delay recovery system and method |
| JP2021519012A (en) * | 2018-04-09 | 2021-08-05 | ドルビー・インターナショナル・アーベー | Methods, devices and systems for 3 degrees of freedom (3DOF +) expansion of MPEG-H 3D audio |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2900985B2 (en) | 1999-06-02 |
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