JPS58150396A - Sound field normal controller - Google Patents

Abstract

PURPOSE:To give the ambience to listeners, by fixing the sound images formed by headphones at a virtual space position which is once decided and controlling the signals fed to both ears in accordance with turns of a body to express a correct virtual space at all times. CONSTITUTION:A base 1 is fixed to a headphone, and a direction mask 5 unified with an azimuth magnet 6 and having a slit 7 at a part is supported rotatably on the base 1. A knob 11 is turned to turn direction correcting stages 2 and 2' after putting headphones on a head and deciding the direction. Thus two photodetecting elements 10 and 10' are set with a good balance at both sides of the slit 7. Under such conditions, the photodetecting quantity and the resistance value are equal to each other between the elements 10 and 10' at the R and L side respectively. Then the head is turned to turn the elements 10 and 10'. However both the magnet 6 and the mask 5 point the south-north direction and have no turn. Therefore the receiving quantity of the photodetecting element has a change, and the resistance value of the element has a change to vary the sound outputs of the R and L sides respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an all-in-one device that gives a listener a sense of presence during sound field reproduction, and particularly relates to a stereo headphone device.

Generally, when listening to a live musical instrument performance, the position of the instrument is perceived by the auditory sense based on the difference in arrival time of the sound pressure of the acoustic signal, etc. , a signal corresponding to the localization of the musical instrument will be reproduced.The signal is transmitted to the ear through a speaker path or headphones at a frequency of Vc. Furthermore, when there is a difference in the signals reaching the left and right ears due to loss in the transmission path, etc., the difference in signal level between the left and right ears is uniquely adjusted and fixed using a balancer or the like for listening.

However, although there are only a few people who actually listen to musical instrument performances,
In other words, they move their ears to feel the playing position of each instrument. Additionally, in the case of speaker playback, the localization of the instrument can be determined mostly based on the position of the body, but in the case of headphone playback, the left and right signal balance is fixed, and the signals given to the left and right σ] ears are independent of the body position. It is difficult to judge the localization, and furthermore, the sound field is localized regardless of the person's body movement, for example, the sound field is always localized in front of the person even when the person turns back, which causes a lack of sense of presence. there were.

This invention was made to solve the above problem, and it fixes the sound image produced by headphones at a partially determined virtual space position, and controls the signals that enter the left and right ears as the body moves (changes direction). The purpose of this invention is to provide a device that can give a sense of realism to the listener by always accurately representing the virtual space in the real world. This will be explained using FIGS. 1 to 6. In FIG. 1, 1 is a pace, and the pace is fixed to the headphone 17 (shown in FIG. 4). 2 and 2' are direction correction tables, and the direction correction tables 2 and 21 are screwed with screws 3. match. This direction correction table 2.2' is connected to the pace IVc by a shaft 4 so that it can rotate freely although it requires a certain amount of torque due to friction etc. e 5 is a direction mask, and this direction mask is connected to a direction magnet 6. It is integrally formed, and part of it is equipped with a slot and a door that allow a suitable amount of light to pass through. The orientation mask 5 is rotatably provided around the protrusion 8 provided on the orientation correction table 2 and the shaft 4 as a fulcrum.
Allow the pole to always direct KN (north). Further, 9 is a light emitting element such as an LED, and 10a and 1σ (shown in FIG. 2) are light receiving elements such as CDS.

Further, 11 is a knob, and the knob is the direction correction base 2σ
]The azimuth correction tables 2 and 2' are press-fixed on the circumference so that they can be easily rotated by hand relative to the pace 1. Fig. 3 shows a block diagram of the OJ of this invention. σ”, 1
Reference numeral 2 denotes a circuit for controlling the output by the control input of the light receiving element l091σ, and 12m and 12a' are input terminals connected to the output side terminals of a stereo amplifier (not shown), respectively. R and R' are resistors for dividing the audio signals i and l', +3 and 17 are amplifiers, and the amplifier 1 (and 13' receives the input of the divided audio signal, and Increase the width and output terminals 14 and 1
4'K output. In FIG. 4, 15 is the head of a human body, 16 indicates the direction of its front (face), and 17 is a stereo headphone, on the top of which the pace l of the present invention device is fixed. , the operation will be explained next. First, the headphone device to which the device of the present invention is attached is attached to the head in an arbitrary (any direction) direction A as shown in FIG.
[When facing, the ON pole of the direction magnet 6 points in the KN (north) direction as shown in FIGS. 4 and 5, but the pace 1 and the direction correction tables 2, 2' rotate by &- in the direction A. Therefore, the light emitting element 9 and the light receiving element 10, 10' provided on the azimuth correction tables 2 and 2' are also rotated by Ka as shown in FIG. For this purpose, turn the knob 11 shown in FIG. 1 to rotate the direction correction table 2.2' counterclockwise, and as shown in FIG. At this position, which is arranged in a well-balanced manner, the amounts of light detected by the light-receiving elements 10 and 10' on the R and L sides become equal, so that the resistance values of the light-receiving elements also become equal. On the other hand, when the audio signal and I are input from the input terminals 12m and 12a', for example, in R9111, this audio signal is
Divided by resistor R and light receiving element lO, light receiving element lO
The audio signal is attenuated to the voltage drop V and input to the amplifier 13, amplified by the amplifier, and output to the R side of the telephone 17. Furthermore, a similar level of audio output can be obtained on the L side as well. By balancing the audio outputs on the R and L sides in this manner, it is possible to determine the reference sound field position in the direction shown in FIG.

Next, while listening to music, if you change the direction of your head from direction 8 to direction B as shown in Figure 6, the light-receiving elements 10 and 10' will also rotate by 1'c b' accordingly. , the compass 6 and the compass mask 5 rotate to indicate the original N direction. Therefore, by positioning the R side light receiving element 9 at the center of the slit 7, the amount of light received from the light emitting element 8 increases and the resistance increases. Therefore, the audio signal generated at both ends of the light-receiving element 90 becomes smaller, and the audio output is smaller than that in the direction of J.-, Tsudoho717 (7) R.
Be added to the side. In addition, the L side σ/light receiving element 10' receives a smaller amount of light from the light emitting element f9, contrary to the case of the R side, so the resistance value is higher than when the direction is σ]. - Since the amount of attenuation of the audio input signal is smaller than that on the R side, a large audio output can be applied to the L side of the headphones.

In the above-mentioned embodiment, the azimuth correction table is rotatable as the pace 1, but it may be configured as shown in FIG. 7. In FIG. 7, a case 18 is fixedly attached to the pace 1, and a correction magnet is rotatable with respect to the pace and the case.
A compass 19 is provided, and a compass magnet 6 and a compass mask 5 are provided so as to be rotatable about a shaft 20 provided on the magnet and a protrusion 21 provided on the pace 1 as a fulcrum. This correction magnet 19 has a knob 22K, which can be turned by hand, so if the orientation mask 5 is out of VC balance with the light receiving element 10' (the same light receiving element as in Fig. 2), the correction magnet is +9
Correction can be made between VC and earth's magnetism, and a balanced position can be easily created.In addition, in order to avoid extreme balance in the present invention, the light receiving elements 10 and 10' are completely shielded by a mask. To avoid this, as shown in Figure 8, you may leave some impedance in the conversion section, or you can add resistors r1 and r2 in series with the light receiving elements 10 and 10' as shown in Figure 9. Furthermore, as shown in FIG. 10, resistors r2 and ri may be provided in the bypass in the balance circuit.
Applying only the band with a large influence to the adjustment device of the device of the present invention,
Portions with relatively little influence may be bypassed and applied to the headphones. This is shown in Figure 11. 23 and 2 are specific band signal filters, and 24 and 24' are other bypass filters. For example, since the sound coming from the rear has few high frequency components, the signal has its high frequency enhanced. Furthermore, by providing a variable phase circuit in the stereo transmission path and associating the light receiving element with the phase circuit, it is possible to control the phase of the output signal with respect to changes in the body position.
As shown in the figure, resistor 25.25' and capacitor 26.26
By configuring the inner resistors 25 and 25' with light-receiving elements, the light-receiving elements 25 and 25' change as the body moves, creating a phase difference between the two, making it possible to control the localization relative to the direction of the body. . Also, Fig. 13 is a circuit that functions similarly to that shown in Fig. 12, and is composed of a light receiving element 27, 27' and a capacitor 28, 28', and changes the phase of the output signal in response to the movement of the body. can do.

In addition, in the embodiments shown in FIGS. 1 and 7, when the light receiving element 10, 10' is in an unbalanced position with respect to the azimuth mask 5, the azimuth correction bases 2, 2' or the correction magnet 19 make noise. However, as shown in Figure 14, there are slight differences in balance between Figures 15 to 17.
As shown in the figure, the output balance by the light receiving elements 10.10' may be corrected by adding correction balancers 29, 30.31, respectively.Since the adjustment by this is related to gain loss etc., the slight difference may be corrected. It is preferable to use an adjustment member, etc. that absorbs operating errors caused by component errors of the device itself.Also, when the device of the present invention is attached to the headphone π, the direction magnet always maintains the orientation even if the headphone is tilted. In order to
Vertical securing stand 33 with K light emitting element 9 and light receiving element L
θ and lO' (same as in Fig. 2) are provided, and the vertical securing stand 33 is placed on the gear stand 35 VC and rotated from the vertical support member 34, and its position relative to the base 1' is moved using the knob 36. The base 1' is attached to the headphones with screws or the like. The above device may be integrated into headphones, or the device may be made as an adapter with a headphone jack and inserted. Also,
Depending on the configuration, the batteries required by this device may be used as weights for the vertical support ().

Further, in the above embodiment, a compass and a compass were used, but as shown in FIG. 19, a compass 37 and a compass w! ,3
Similar effects can be obtained by using 8. Furthermore, the detection power of the light receiving elements 10 and 10' shown in the above embodiment can be used as the control input of the variable impedance element provided in the stereo signal transmission path. Also, as a method of making an orientation mask used in an embodiment of the present invention, a CDS (light receiving element)
When it is dark, the impedance (Z) is infinite, and when it is bright, the impedance is minimum, so it is made into a disk shape of magnetic material and magnetized so as to be shielded by CDS. The shape of the orientation mask is the second
Figure 0 (a).

(ol, 5a, 5b, 5c shown in (c)), but it can take any shape depending on the operating characteristics of the detector. By the way, as a device for detecting the amount of movement,
In the above embodiment, a detector using an azimuth mask has been described, but a detector as shown in FIG. 21 may also be used.

In FIG. 21, numeral 39 is a floating ball, the surface of which is black, and the center has a white reflective surface 4, for example.
0 along the circumference and a compass grinding stone 41 at the bottom thereof, this floating ball 39 is placed in a circular ball case 42 shown in FIG. The case consists of a lid 44 and a main case 45. Oil 50 is injected from the lower part 43 as shown in FIG.
2, and the main body case 45
D. The ball case 42, which is configured with VcllI as described above, is attached to the mounting member 4, in which the light emitting element 46 and the light receiving elements 47 and 4γ are provided.
8 with a pin 49, and the mounting member 4
Attach 8 to the do horn. If configured like this σ], even when the body is horizontal as shown in Figure 23, and even if the body (or headphones) is tilted as shown in Figure 24, the horizontal direction can be rotated freely, and the vertical direction can also be tilted to a certain extent. Can be used. In addition to the direction detecting means described above, the amount of movement can be detected using a VC Hall element 51 as shown in FIGS. 25 to 27. Maximum output is generated in the direction perpendicular to . Therefore, this Hall element 51 is connected to the rotating member 52 shown in FIG.
Further, a variable impedance element is provided on the headphone transmission system, and the variable impedance element is controlled by the output of the Hall element 51σ. To explain this operation, first, the headphone 53 is placed on the head, and the turntable 52 to which the Hall element 51 is attached is rotated and fixed at a position where the output of the Hall element 51Q becomes zero as shown in FIG.

Next, when you shake your head from side to side, the output of eeσ and VC are shown in Figure 28.
3 and when the output of the Hall element 51 is zero,
L side and R side Q] are configured so that the outputs are approximately equal, and when the output of the Hall element 51 is the output of ■ or e,
Since the present invention is configured as described above, the VCA outputs an output in accordance with the direction, and the present invention includes an azimuth means such as the azimuth magnet 6 that always indicates a constant direction, and a light emitting element that detects the amount of movement by being associated with the azimuth means. It is equipped with detection means such as @ and light receiving elements 10 and 10', and circuit means such as σ] circuit means such as a parallel circuit 12 that varies and outputs an input signal in response to changes in the amount detected by the detection means. By automatically detecting the position as you move and adjusting the signal output, the sound field is always set at a constant position, so if you change the direction of your body, the sound will change to the left.

The signal output to the right ear is controlled, giving the listener a sense of realism.

[Brief explanation of the drawing]

1 to 6 show one embodiment of the present invention, in which FIG. 1 is a side view, FIG. 2 is a plan view, FIG. 3 is a block diagram, and FIGS. 4 and 6 are used. FIG. 5 is a plan view showing the state, and FIGS. 28 to 28 show other embodiments, FIG. 7 is a sectional view, FIG. 8 is a plan view, and FIG. 9 is a plan view. 10 to 13 are respective balance circuits, FIG. 14 is a schematic plan view, FIGS. 15 to 17 are 7977 circuits, FIG. 18 is a side view, and FIG. 19 is a main part. A side view, FIG. 20 is a plan view showing the shape of the orientation mask, FIGS. 21 to 24 show other movement amount detectors, FIG. 21 is a perspective view, FIG. 22 is an exploded view, Second
FIG. 3 is a side view showing the state of use, and FIGS. 25 to 28 are movement amount detectors using Hall elements,
FIG. 25 is a block diagram, FIG. 26 is a plan view, FIG. 27 is a perspective view, and FIG. 28 is a block diagram. 6: Compass magnet, 9: Light emitting element, 10.10': Light receiving element. 12; Balance circuit. Figure 1 Figure 2 Figure 3 Figure 4 *7? I 8IvlFigure 11Figure 12Figure 13' +4 =-i Figure 159 1ゞ +6 Fη
+2 17 Figure 20
Figure 22 (in (D) ()\) No. 23
Figure 25 Figure 27 Figure l No. 28゜

Claims (1)

[Claims] (1) An azimuth means that always indicates a constant direction, a means for detecting the amount of movement by relating to the azimuth means, and an input signal that is variable in response to changes in the amount detected by the detection means. A sound field localization control device characterized in that the sound field is always fixed at a constant position by automatically detecting the position according to the movement of a human body and adjusting the signal output. . (2) The sound field localization according to claim 1, wherein the detection means is divided into a base part and an azimuth correction table rotatable with respect to the base part, and the azimuth correction table is provided with the detection means. (3) The sound field localization control device according to claim 1, wherein the orientation means has a rotatable correction magnetic body provided in the base portion to enable the orientation correction; 14) The correction magnetic body The sound field localization control device according to claim 3, further comprising an operation knob. (5) The sound according to claim 1, wherein the orientation means applies a brake to the rotational force of the orientation means so that the amount of movement cannot be detected when the orientation means is moved in a short time. (6) a sound field localization control device according to claim 1, in which a specific frequency weighting circuit is provided as the circuit means; (7) a sound field localization control device in claim 1, in which a variable phase circuit is provided as the circuit means; The sound field localization control device according to scope 1. (8) The sound field localization control device according to claim 1, wherein the orientation means is constituted by an optical shielding mask and a orientation magnet, and is a member of a photosensor whose internal impedance changes according to the amount of light. (9) The sound field localization control device according to claim 8, wherein the circuit means is a balancer configured to directly apply a stereo signal to the photosensor. fl■ Sound field localization control device according to claim 8, in which the output of the photosensor member is a control input of a variable impedance element provided in a stereo transmission path. Claim 2: A vertical support member is provided to allow the orientation table to be rotatable relative to the pace member in order to maintain a substantially constant position.
9. The sound field localization control device according to claim 1 or 8, wherein a reflecting member for reflecting light is provided as the azimuth means. 03. A sound field localization control device according to claim 1, using a Hall element as the orientation means,