JPH03250899A - Headphone reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to headphone playback on a television or the like.
The present invention relates to a headphone playback device that realizes sound image localization outside the head.

BACKGROUND OF THE INVENTION FIG. 12 shows a block diagram of a conventional headphone playback device. In FIG. 12, 1 is an acoustic reproduction bag that reproduces acoustic signals! , 2 is an amplifier that amplifies the acoustic signal, 3
are headphones.

As is clear from FIG. 12, in the conventional headphone playback device, the sound signal output from the sound playback device 1 is amplified via the amplifier 2, and then played back to the left and right ears independently by the headphones 3.

Invention tries to solve! However, the above-described configuration has the problem that the sound image generated by the acoustic signal is formed in the head, giving an unnatural feeling and increasing fatigue.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a headphone playback device that realizes out-of-the-head localization of sound images even in headphone playback, and can perform playback similar to normal speaker playback.

Means for Solving the Problems In order to solve the above-mentioned problems, the headphone playback device of the present invention includes an image sound playback means for playing back a monaural sound signal and an image signal synchronized therewith, and an image for monitoring the played image signal. a reproduction means, a reflected sound generation means for creating spatial reflected sound and reverberant sound from the reproduced monaural acoustic signal, an addition means for adding an output signal of the reflected sound generation means and the monaural acoustic signal, and from the addition means. It is equipped with headphones that reproduce the output audio signals independently to the left and right ears.

Effect of the Invention With the above configuration, the present invention adds a visual effect by reproducing a video synchronized with an audio signal at the same time as the audio signal, and also eliminates room reflections that occur in normal speaker reproduction but not in stereo headphone reproduction. By supplementing sound and spatial lost-talk signals during headphone playback, it is possible to localize the sound image outside the head during headphone playback.

Embodiments Hereinafter, headphone playback devices according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a headphone playback device according to a first embodiment of the present invention. In Figure 1,
5 is a video deck that plays back a monaural audio signal and a video signal synchronized with it; 6 is a television that monitors video; 7 is a reflection device that delays the input signal by a certain amount of time and multiplies this delayed signal by a certain value. A sound generation circuit, 8 is an addition circuit that adds a monaural sound signal and reflected sound, and 9 is a headphone that reproduces the input sound signal to the left and right ears independently.

Regarding the headphone playback device configured as above,
Its operation will be explained using drawings.

First, the video deck 5 reproduces a monaural audio signal and a video signal synchronized with this audio signal.

The video signal is input to the television 6 and the video is played back. The monaural acoustic signal is input to a reflected sound generation circuit 7 and reflected sound is added thereto. The reflected sound here refers to the reflected sound from walls, etc. that occurs when an input signal is reproduced through a speaker in a normal listening room.

FIG. 8 shows an example of a specific reflected sound generation circuit.

In FIG. 8, 24 is a delay element (τ1 to τn: delay time) that delays a signal by a certain amount of time, and 25 is a multiplier (A, to τn: delay time) that multiplies the output signal of each delay element by a certain value. Ao: multiplicative value), 30 is an adder. The value of this multiplier and the delay time of the delay element are:
The value is determined from the results of actually measuring the structure of reflected sound in a normal listening room or the like, or from the structure of reflected sound determined by computer simulation. For example, Figure 9 shows the reflected sound structure determined by the summer measurement system, where the vertical axis is amplitude and the horizontal axis is time. As shown in Fig. 9, if the delay time of the reflected sound is T1 to T4 and the amplitude is 81 to B, then , A, -B.

τ-T-TA 壬B 4 4 8% 4
Set it to 4.

The output signal of the reflected sound generation circuit 7 is input to the addition circuit 8,
It is added to the monaural audio signal reproduced by the video deck 5. The added signal is branched into two and radiated to both ears by the headphones 9.

FIG. 2 shows a block diagram of a headphone playback device according to a second embodiment of the present invention. However, the same numbers are added to those having the same functions as those shown in the first embodiment described above, and the description thereof will be omitted. In Figure 2, 10-
1.10-2 is a crosstalk generation circuit that generates crosstalk signals for signals radiated to different ears, 8-1
．． 8-2 is an addition circuit that adds the monaural acoustic signal, reflected sound, and crosstalk signal. The operation will be explained below using the drawings. As in the first embodiment, the video deck 5 first reproduces a monaural audio signal and a video signal synchronized with the audio signal, and the video signal is input to the television 6 to reproduce the video.

The monaural acoustic signal is input to the reflected sound generation circuit 7 and reflected sound is added.The output of the reflected sound generation circuit 7 is input to the left ear crosstalk generation circuit 1O-1 and the right ear crosstalk generation circuit 10-2. be done. Crosstalk circuit 10 for left ear
-1, the reflected sound radiated to the right ear is processed as a crosstalk component, and the right ear crosstalk circuit 10-2 is processed as the crosstalk component to the reflected sound radiated to the left ear. For example, as shown in Figure 7, the crosstalk generation circuits 10-1 and 10-2 correspond to signals that reach the right ear from the left, and conversely, the signals that come from the right reach the left ear. In order to create a signal that
It is composed of a filter circuit 14 having a certain amplitude characteristic and a delay circuit 15 that delays the crosstalk signal.

Figure 10 shows the relationship between radiated signals during normal speaker playback. In Figure 10, 26 is the speaker, 27 is the human head, DL is the direct sound reaching the left ear from the speaker, and D
, is the direct sound reaching the right ear from the speaker, RLL is the reflected sound reaching the left ear from the left direction, RLR is the reflected sound reaching the right ear from the left direction, and R□ is the reflection reaching the right ear from the right direction. The sound RIIL is a reflected sound that reaches the left ear from the right direction.

Further, FIG. 11 is a diagram illustrating the amount of delay time of the crosstalk signal set in the delay circuit 15.

In FIG. 11, 29 indicates the human head, point F indicates the position of the sound source, dotted line indicates the left ear, and point E indicates the right ear.

In Fig. 11, if sound is radiated from point F, then the distance difference between point F and H's ear is 1 on the straight line DF! If G is a point with the same distance as EF, then DC
becomes. Therefore, if the speed of sound is C, the amount of delay T for crosstalk is T-1/C (seconds).The delay time of each delay circuit is set based on this idea.

The addition circuit 8-1 adds the monaural signal reproduced by the video deck 5, the reflected sound generated by the reflected sound generation circuit 7, and the crosstalk signal generated by the left ear crosstalk generation circuit 10-1. Similarly, the addition circuit 8-2 adds the monaural signal reproduced by the video deck 5, the reflected sound generated by the reflected sound generation circuit 7, and the crosstalk signal generated by the right ear crosstalk generation circuit 10-2. , are played through headphones 9 to the left ear and right ear, respectively.

FIG. 3 shows a block diagram of a headphone playback device according to a third embodiment of the present invention. In Figure 3,
11-1, 11-2, 11-3, and 11-4 are phase control circuits that control the phase of signals input to this circuit. The reflected sound and cross-1 signal generated in the same manner as in the second embodiment are transmitted to each phase control circuit 11-1.
11-211-3.11-4, and the phase is particularly controlled so that there is no correlation between the left and right signals.
For example, when performing this phase control simply, the signal input to the phase control circuit 11-1, 11-2 is multiplied by minus 1 to invert the phase.

This operation alone makes it possible to localize the sound image outside the head. Of course, the phase of the Ishikawa signal may be reversed, and in the adder circuit 8-1. and is radiated to both ears by the headphones 9.

FIG. 4 shows a block diagram of a headphone playback device according to a fourth embodiment of the present invention. In Figure 4,
Reference numerals 7-1 and 7-2 are reflected sound generation circuits having the same functions as those in the first embodiment.

Similar to the first embodiment, a monaural sound signal is reproduced by the video deck 5, and this signal is transmitted to the reflected sound generation circuit 7-1.
．． 7-2. Reflected sound generation circuit 7-1.7-2
In this case, reflected sound is added so that the reflected sound radiated to the right ear and the left ear are different. For example, the multiplier values shown in FIG. 8 are set to be different in the reflected sound generation circuits 7-1 and 7-2. By doing so, it becomes possible to make the structure of the reflected sound more complex, and the effect becomes greater. The reflected sound generated in this way and the reproduced monaural sound signal are added together by an adder 8-18-2, and the resultant sound is radiated to both ears through the headphones 9.

FIG. 5 shows a block diagram of a headphone playback device according to a fifth embodiment of the present invention. In Figure 5,
12-1 and 12-2 are crosstalk generation circuits having the same functions as those in the second embodiment. The crosstalk generation circuits 12-1 and 12-2 generate respective crosstalk signals for the reflected sounds generated in the same manner as in the fourth embodiment, and combine the crosstalk signals, the reflected sounds, and the reproduced monaural signals. The audio signals are added by adders 8-1 and 8-2, respectively, and are radiated to both ears through headphones 9.

FIG. 6 shows a block diagram of a headphone playback device according to a sixth embodiment of the present invention. In Figure 6,
13-1, 13-2, 13-3, and 13-4 are phase control circuits having the same functions as those in the third embodiment. Similarly to the third embodiment, the phase control circuit performs phase control on the generated reflected sound and crosstalk signal so that there is no correlation between the left and right signals. When performing phase control, the phase control circuit 13
-1. Multiply the signal input to 13-2 by minus 1 to invert the phase. Conversely, the phase of Ishikawa's signal may be reversed. The thus phase-controlled signal and the monaural acoustic signal are added by adders s-i and s-2, respectively, and are radiated to both ears by the headphones 9.

Note that the reflected sound generation circuits 7 and 7-1. 7-2 is the first
By adding a reverberation signal created by combining a circuit that feeds back the input signal, such as the all-bus filter shown in Figure 2, it becomes closer to the normal speaker reproduction state (and is even more effective. Figure 12). In,
31.35.36 is a multiplier, 32.33 is an adder, 34
is a delay device. Further, g represents a gain, and τ represents a delay time.

Effects of the Invention As described above, the present invention provides an image and sound reproduction means for reproducing a monaural sound signal and an image signal synchronized therewith, an image reproduction means for monitoring the reproduced image signal, and a method for reproducing a monaural sound signal from the reproduced monaural sound signal. A reflected sound generation means for creating spatial reflected sound and reverberant sound, an addition means for adding the output signal of the reflected sound generation means and a monaural acoustic signal, and an acoustic signal outputted from the addition means for the left and right ears independently. It is equipped with headphones that play back sound, and by simultaneously using an image signal synchronized with the acoustic signal, it adds a visual effect, and by adding signals such as reflected sound and crosstalk, it can be used as a speaker It is possible to reproduce the state during playback during headphone playback, and to achieve off-the-head localization during headphone playback as well.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a headphone playback device according to a first embodiment of the present invention, FIG. 2 is a block diagram of a headphone playback device according to a second embodiment of the present invention, and FIG. 3 is a block diagram of a headphone playback device according to a second embodiment of the present invention. FIG. 4 is a block diagram of a headphone playback device in a fourth embodiment of the present invention; FIG. 5 is a block diagram of a headphone playback device in a fifth embodiment of the present invention; FIG. 6 is a block diagram of a headphone playback device according to a sixth embodiment of the present invention, FIG. 7 is a block diagram of a crosstalk generation circuit according to an embodiment of the present invention, and FIG. 8 is a block diagram of a reflected sound according to an embodiment of the present invention. A block diagram of the generation circuit, FIG. 9 is an amplitude characteristic diagram of the reflected sound generation circuit in an embodiment of the present invention, FIG. 10 is a diagram showing the relationship between radiated signals during normal speaker reproduction, and FIG. 11 is a diagram of the embodiment of the present invention. FIG. 12 is a block diagram of a reflected sound generation circuit in another embodiment of the present invention, and FIG. 13 is a block diagram of a conventional headphone playback device. 5...Video deck, 6...Television camera, 7...Reflected sound generation circuit, 8...
Adding circuit, 9...Headphones.

Claims (9)

[Claims] (1) An image sound reproduction means for reproducing a monaural sound signal and an image signal synchronized with this signal, an image reproduction means for monitoring the reproduced image signal, and a space from the monaural sound signal reproduced by the image reproduction means. reflected sound generating means for creating reflective sound and reverberant sound; addition means for adding the output signal of the reflected sound generating means and the monaural sound signal; 1. A headphone playback device comprising: headphones that play music independently; and headphones that play music independently. (2) The reflected sound generation means and addition means branch the signal after adding the reflected sound to the input signal into first and second signals, and generate left and right crosstalk signals from each signal, respectively. Claim (1) characterized in that the monaural acoustic signal, each crosstalk signal, and reflected sound are added together, and each signal is reproduced independently to the left and right ears.
1) The headphone playback device described above. (3) The reflected sound generation means and addition means branch the signal after adding the reflected sound to the input signal into first and second signals, and generate left and right crosstalk signals from each signal, respectively. Then, by controlling the phase of the reflected sound and crosstalk signal, the monaural acoustic signal and each phase-controlled crosstalk signal and reflected sound are added, and each signal is reproduced independently to the left and right ears. The headphone playback device according to claim (1). (4) The reflected sound generation means and the addition means have two reflected sound generation means, and after adding different reflected sounds to the input signal, add the monaural acoustic signal and each reflected sound, and add each reflected sound to the input signal. 2. The headphone playback device according to claim 1, wherein the headphone playback device plays independently to the left and right ears. (5) The reflected sound generation means and the addition means have two reflected sound generation means, and after adding different reflected sounds to the input signal, branch each into two signals, and from each signal, left and right signals are added. According to claim (1), the apparatus generates crosstalk signals, adds the crosstalk signals, monaural acoustic signals, and respective reflected sounds, and reproduces the respective signals independently to the left and right ears. Headphone playback device. (6) The reflected sound generation means and the addition means have two reflected sound generation means, and after adding different reflected sounds to the input signal, branch each into two signals, and from each signal, left and right signals are added. Each generates a crosstalk signal, controls the phase of the reflected sound and the crosstalk signal, and adds the mono acoustic signal and each phase-controlled reflected sound and crosstalk signal, and each signal is sent to the left and right ears independently. 2. The headphone playback device according to claim 1, wherein the headphone playback device plays back the music. (7) The crosstalk signal is generated by applying a filter with a certain amplitude frequency characteristic and delaying the signal by a certain time.
The headphone playback device according to any one of (4), (5), and (6). (8) Claims (1) and (2) characterized in that the reflected sound generation means is a combination of a plurality of delay means for delaying the input signal by a certain time and multiplication means for multiplying the delayed signal by a certain value. ), (3), (4), (5), and (6). (9) The reflected sound generation means is characterized by combining a plurality of delay means for delaying the input signal by a certain time, multiplication means for multiplying the delayed signal by a certain value, and feedback means for feeding back the input signal. Claims (1), (2), (
3), (4), (5), and the headphone playback device according to any one of (6).