JPH03250898A - headphone playback 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. 14 is a block diagram of a conventional headphone playback device. In FIG. 14, ■ is an audio reproduction device that reproduces an audio signal, 2 is an amplifier that amplifies the audio signal, and 3 is an audio reproduction device that reproduces an audio signal.
are headphones.

In this way, in the conventional headphone reproduction device, the audio signal output from the audio reproduction device 1 is amplified via the amplifier 2 and reproduced independently to the left and right ears by the headphones 3.

Problems to be Solved by the Invention However, with the above configuration, as is well known, the sound image generated by the acoustic signal is formed in the head or near the ears, giving an unnatural feeling and increasing fatigue. There was a problem.

The present invention has been made in s-b to solve the above problems, and provides a headphone playback device that realizes out-of-head localization of the sound image even in headphone playback, and can perform playback similar to normal speaker playback. be.

Means for Solving the Problems In order to solve the above problems, the headphone reproducing device of the present invention includes an image sound reproducing means for reproducing a stereo sound signal and an image signal synchronized therewith, and an image for monitoring the reproduced image signal. a reproduction means, a reflected sound generation means for creating a spatial reflected sound and a crosstalk signal from the reproduced stereo sound signal, an addition means for adding the output signal of the reflected sound generation means and the acoustic signal, and an output from the addition means. The headset is equipped with headphones that reproduce sound signals to the left and right ears independently.

According to 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 furthermore, it is possible to add a visual effect by reproducing an image synchronized with an audio signal, and furthermore, it is possible to add a visual effect by reproducing an image synchronized with an audio signal, and also to reduce the reflected sound of the room and the space, which occurs in normal speaker reproduction and does not occur in stereo headphone reproduction. By supplementing the crosstalk signal 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 stereo audio signal and a video signal synchronized therewith; 6 is a television that monitors the video; 7 is a television that adds input signals, delays the added signal by a certain amount of time, and adds a signal to the delayed signal. 8-1.8-2 is an addition circuit that adds the stereo sound signal and the reflected sound. 9 is an adder circuit that adds the input acoustic signal to the left and right ears independently. Headphones for playback.

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

First, the video deck 5 reproduces a stereo 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 right and left stereo sound signals are generated by the reflected sound generation circuit 7.
is input and added to. Then, reflected sound is generated from the added signals. 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 a specific example of a portion of the reflected sound generation circuit 7 that generates reflected sound. In FIG. 8, 24 is a delay element (τ1 to τ
. : delay time), 25 is a multiplier that multiplies the output signal of each delay element 24 by a certain value (A, ~An: multiplication value)
, 30 is an adder. The value of the multiplier 25 and the delay time of the delay element 24 are 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 obtained by computer simulation. For example, FIG. 9 shows a reflected sound structure determined by computer simulation, with the vertical axis representing amplitude and the horizontal axis representing time.

As shown in Fig. 9, when the delay time of the reflected sound is T1 to T4 and the amplitude is 81 to B4, τl = TI AI = B1r = T
T SA2 =8222 + τ T-TA-B! I3 2- 3 9τ-T
-TA-B 4 4 3 \ 44 is set.

The output signal of the reflected sound generation circuit 7 is branched into two, input to an adder circuit 8-1, 8-2, and added to the stereo sound signal reproduced by the video deck 5. The added signals are respectively transmitted to the headphones 9 and radiated to the ear.

FIG. 2 is a block diagram of a headphone playback device according to a second embodiment of the present invention. However, those having the same function will be given the same number and their explanation will be omitted. In FIG. 2, 1O-11O-2 is a crosstalk generation circuit that generates crosstalk signals for signals radiated to different ears.

The operation will be explained below using the drawings.

As in the first embodiment, the video deck 5 first reproduces a stereo 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 stereo sound signal is input to the reflected sound generation circuit 7, and after being added, reflected sound is added. The output of the reflected sound generation circuit 7 is input to a left ear crosstalk generation circuit 10-1 and a right ear crosstalk generation circuit 10-2. The left ear crosstalk circuit 10-1 processes the crosstalk for the reflected sound emitted to the right ear, while the right ear crosstalk circuit 10-2 processes the crosstalk for the reflected sound emitted to the left ear. The processing is performed as follows. For example, this crosstalk generation circuit 10-L 10-2 is the 10th
As shown in the figure, crosstalk was measured in an anechoic chamber to create a signal that corresponds to a signal coming from the left reaching the right ear, and conversely a signal coming from the right reaching the left ear. Filter circuit 1 with amplitude characteristics using characteristics
5 and a delay circuit 16 for creating a delay in the crosstalk signal.

FIG. 11 shows the relationship between radiated signals during normal speaker reproduction. In Fig. 11, 26 is the left speaker, 27 is the right speaker, 28 is a human head, DLL is the direct sound reaching the left ear from the left speaker, D is the direct sound reaching the right ear from the left speaker, D□ is the direct sound reaching the right ear from the right speaker, DRL is the direct sound reaching the right ear from the right speaker,
RLL is a reflected sound that reaches the left ear from the left direction, RLR is a reflected sound that reaches the right ear from the left direction, RlIII is a reflected sound that reaches the right ear from the right direction, and RIIL is a reflected sound that reaches the left ear from the right direction. It's a sound.

Further, FIG. 12 is a diagram illustrating the amount of delay time of the Kukostalk signal set in the delay circuit 16.

In FIG. 12, 29 indicates the human head, point F indicates the position of the speaker, dotted point indicates the left ear, and point E indicates the right ear. In Fig. 12, if sound is radiated from F, then the distance difference between the point F and the ear of H is DG, where G is a point on the straight line DF having the same distance as the distance HEF. 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 combines the stereo sound 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, in the addition circuit 8-2, the Furukawa stereo sound signal reproduced by the deodenki 5, the reflected sound generated by the reflected sound generation circuit 7, and the cross generated by the right ear crosstalk generation circuit 10-2 are added. The signal is added to the talk signal and played back to the left ear and the right ear through headphones 9, respectively.

FIG. 3 shows a block diagram of a headphone playback device according to a third embodiment of the present invention. In Figure 3,
11-1.11-2.11-311-4 is a phase control circuit that controls the phase of a signal input to this circuit. The reflected sound and crosstalk signal generated in the same manner as in the second embodiment are transmitted to the respective phase control circuits 11-1.11.
-2゜11-3.11-4, and the phase is controlled so that there is no correlation between the left and right signals.For example, when performing this phase control simply, the phase control circuit 11 -1. Multiply the signal input to 11-2 by minus 1 to invert the phase.

This operation alone makes it possible to localize the sound image outside the head. The phase of Ishikawa's signal may be reversed.

Then, in the adder circuit 8-1, 8-2, the signal subjected to phase control in this way and the stereo sound signal reproduced by the video deck 5 are added, and the signal is added to the headphone 9.
radiates to both ears.

FIG. 4 shows a block diagram of a headphone playback device according to a fourth embodiment of the present invention. In Figure 4,
7-1.7-2 is a reflected sound generation circuit that generates reflected sound from a human signal.

Similarly to the first embodiment, a stereo sound signal is reproduced by the stereo sound signal 5, and a sex signal is transmitted to the reflected sound generation circuit 7-1.
．． In the nine reflected sound generating circuits 7-1 and 7-2 to which the platform signal is input to the reflected sound generating circuit 72, reflected sounds are added so that the reflected sounds radiated to the right ear and the left ear are different. For example, if the value of the multiplier shown in FIG.
．． 72 and set differently. By doing this, it is possible to make the structure of the reflected sound more complex, and the effect becomes thicker.The reflected sound generated in this way and the reproduced stereo sound signal are added to the adder 8-1.
．． 8-2, the stone signal and the left signal are added and radiated to both ears by 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. For the reflected sounds generated in the same manner as in the fourth embodiment, respective crosstalk signals are created by the crosstalk generation circuit ill, 12-2, and the crosstalk signals, the reflected sounds, and a reproduced stereo acoustic signal are generated. and by adder 8-1.8-2, Ishikawa 2
The left side signal is added and the headphone 9 emits the signal to both ears. However, in the second embodiment, the output of the crosstalk signal does not cross, but this is because the reflected sound is monaural, and even if it crosses, it is the same.

FIG. 6 shows a block diagram of a headphone playback device according to a sixth embodiment of the present invention. In Figure 6,
13-1.13-2.13-313-4 is a phase control circuit having the same function as the third embodiment. Similarly to the embodiment No. 13, the phase control circuit 13-1.13-2.13
-3 In 13-4, phase control is performed on the generated reflected sound and crosstalk signal 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 13-113-2 is multiplied by minus 1 to invert the phase. Conversely, the phase of Furukawa's signal may be reversed. The signal whose phase has been controlled in this way and the stereo sound signal are added to an adder 8-1.
．． 8-2, the signals are added and radiated to both ears through the headphones 9.

FIG. 7 shows a block diagram of a headphone playback device according to a seventh embodiment of the present invention. In Figure 7,
Reference numerals 14-1 and 14-2 are crosstalk generation circuits that reproduce crosstalk signals for direct sounds that normally occur during speaker reproduction.

The basic function and configuration of the second crosstalk generation circuit 14-1. The only difference is the filter characteristics and delay time. For example, crosstalk for direct sound is as shown in Figures 10 and 11.
Assume that the direct sound from the speaker comes from 30 degrees in front of you,
The reflected sound is calculated assuming that it comes from 60 degrees in front.

The signal generated by this crosstalk generation circuit 14-1, 14-2 is added to the reflected sound and the input stereo sound signal, and is radiated to both ears by the headphones 9.

Note that by adding this direct sound crosstalk generation circuit to all the embodiments described above, the effect of extra-head localization can be further increased.

In addition, the reflected sound generation circuits 7 and 7-1.7-2 that generate reflected sound in the embodiment shown above are combined with circuits to which input signals are fed back, such as an all-bus filter as shown in FIG. By adding the reverberation signal to be created, the reproduction state becomes closer to that of normal speaker reproduction, and the effect is further improved. In Figure 13, 31.35.3
6 is a multiplier, 32.33 is an adder, and 34 is a delay device.

Further, g indicates a gain, and τ indicates a delay time.

In the embodiment, a video digital camera was used to reproduce images and audio signals, but the same effect can be obtained with ordinary television broadcasting.

Effects of the Invention As described above, the present invention provides an image sound reproduction means for reproducing a stereo sound signal and an image signal synchronized therewith, an image reproduction means for monitoring the reproduced image signal, and an image reproduction means for reproducing a stereo sound signal and an image signal synchronized therewith; reflected sound generation means for creating spatial reflected sound and crosstalk signals; addition means for adding the output signal of the reflected sound generation means and the acoustic signal; It is equipped with headphones for playback, 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 reproduce normal speaker playback. It is possible to reproduce the situation during headphone playback, and realize off-the-head localization even during headphone playback.

[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. The block diagram of the headphone reproducing device according to the embodiment, FIG. 4 is a headphone recycle bag according to the fourth embodiment of the present invention! , FIG. 5 is a block diagram of a headphone playback device according to 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, and FIG. 7 is a block diagram of a headphone playback device according to a sixth embodiment of the present invention. FIG. 8 is a block diagram of the reflected sound generation circuit in the embodiment of the present invention, and FIG. 9 is an amplitude characteristic diagram of the reflected sound generation circuit in the embodiment of the present invention. , Fig. 1O is a block diagram of the crosstalk generation circuit in the embodiment of the present invention, Fig. 11 is a diagram showing the relationship of radiated signals during normal speaker reproduction, and Fig. 12 is a diagram showing the settings for the delay circuit in the embodiment of the present invention. FIG. 13 is a block diagram of a reflected sound generation circuit in another embodiment of the present invention, and FIG. 14 is a block diagram of a conventional headphone playback device. 5...Video deck, 6...Television, 7...Reflected sound generation circuit, 8-1.8-2
・・・・・・Addition circuit, 9・・・・・・Hesitphone.

Claims (11)

[Claims] (1) An image and sound reproduction means for reproducing a stereo 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 stereo sound signal reproduced by the image reproduction means reflected sound generation means for creating reflected sound and crosstalk signals; addition means for adding the output signal of the reflected sound generation means and the acoustic signal; A headphone playback device comprising: headphones that play independently. (2) The reflected sound generation means and the addition means add the two reproduced stereo sound signals, add the reflected sound to this added signal, branch the signal into two, and add each signal to the Claim (1) characterized in that after being added to the stereo sound signal, it is reproduced independently to the left and right ears.
The headphone playback device described. (3) The reflected sound generation means and addition means add the two reproduced stereo sound signals, add reflected sound to this added signal, and generate left and right crosstalk signals from the signals, respectively. The headphone playback device according to claim 1, wherein the headphone playback device adds the right and left stereo sound signals, a crosstalk signal, and a reflected sound, and plays each signal independently to the left and right ears. . (4) The reflected sound generation means and the addition means add the two reproduced stereo sound signals, add reflected sound to this added signal, and generate left and right crosstalk signals from the signals, respectively. the stereo sound signals for the right and left, the crosstalk signal, and the reflected sound by controlling the phase of the reflected sound and the crosstalk signal, and independently reproducing each signal to the left and right ears. The headphone playback device according to claim 1, characterized in that: (5) The reflected sound generation means and the addition means have two reflected sound generation means, one for the right and one for the left, and after adding different reflected sounds to the input signal, add the stereo sound signals for the right and left, respectively. 2. The headphone playback device according to claim 1, wherein the reflected sound is added and the resulting signal is played back to the left and right ears independently. (6) The reflected sound generation means and the addition means have two reflected sound generation means, one for the right side and one for the left side, and after adding different reflected sounds to the input signal, branch each into two signals, and add each reflected sound to the input signal. According to claim (1), the apparatus generates left and right crosstalk signals from the stereo sound signal, adds the crosstalk signals to the stereo sound signal, and reproduces each signal independently to the left and right ears. headphone playback device. (7) The reflected sound generation means and the addition means have two reflected sound generation means, one for the right side and one for the left side, and after adding different reflected sounds to the input signal, branch each into two signals, and separate the respective signals. The left and right crosstalk signals are respectively generated from the left and right crosstalk signals, and the phases of the respective reflected sounds and crosstalk signals are controlled to generate the right and left phase-controlled crosstalk signals, reflected sounds, and the stereo acoustic signal, respectively. 2. The headphone playback device according to claim 1, wherein the headphone playback device adds the signals and plays the signals independently to the left and right ears. (8) The reflected sound generation means and the addition means generate a spatial crosstalk signal for the right and left direct sounds of the input stereo sound signal, and generate a reflected sound crosstalk signal, a reflected sound, and a stereo sound signal. Claim (1) characterized in that the signal is added to the left and right ears and reproduced independently.
The headphone playback device according to any one of (2), (3), (4), (5), (6), and (7). (9) The crosstalk signal for direct sound and reflected sound 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 (6), (7), and (8). (10) A claim characterized in that the reflected sound generation means generates reflected sound by combining a plurality of delay means for delaying an input signal by a certain time and multiplication means for multiplying the delayed signal by a certain value. Terms (1), (2), (3
), (4), (5), (6), (7), and (8). (11) The reflected sound generation means generates reflected sound 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) characterized in that:
, (6), (7), and (8).