JPS61116395A - Acoustic apparatus - 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 the Invention The present invention relates to an acoustic device capable of adding reverberant sound that gives a sense of distance and spaciousness to an original sound.

BACKGROUND OF THE INVENTION Conventionally, as a device for obtaining reverberation ft-, the one shown in FIG. 4 has been proposed (Patent Publication No. 58-194095). That is, on the output side of the preamplifier 2 to which the audio signals are input from the player and the tuner 1, a direct sound signal system 3 and a reverberant sound signal system 4 are branched and provided. A reverberation sound generating device 5 is installed. Further, a mixer 6 is connected to both signal systems 3 and 4, and a main amplifier 7 and a speaker 8 are provided on the output side of the mixer 6. In this configuration, the player and tuner 1 input the preamplifier 2t to the reverberant sound generator 5, and the next insult signal is given a delay time and transferred from the direct sound signal system 3 as a reverberant sound signal. It is mixed with the direct sound signal in mixer 6. The t signal obtained by the mixing is amplified by the main amplifier 7, reproduced by the speaker 8, and reverberant sound is added to obtain the t reproduced sound.

Problems to be Solved by the Invention However, in such conventional devices, as described above, the direct sound signal and the reverberant sound signal are mixed and reproduced by the same speaker 8. There is. Therefore, the direct sound and indirect sound are heard from the same direction to the listener's ears, and the effect of giving a false impression of the distance to the IT source cannot be obtained. Particularly in structures such as vehicle f-sound systems that require speakers to be installed close to the listener's ears, if the above effects are not sufficient, the listener may experience a loud sound as if it were being generated close to their ears. It is virtually difficult to listen for long periods of time.In addition, with regard to the reverberant sound effect that expands the space in which the sound of the instrument being played or the vocal can be heard, the direct sound and the reverberant sound are heard from the same direction. , it is not necessarily enough to obtain 7t.

The present invention has been made in view of the conventional situation, and it is possible to obtain ideal sound image localization and reverberant sound effects by amplifying and reproducing direct sound and reverberant sound in different systems. The present invention provides a possible acoustic device.

Means for Solving Problems Problem 'f': To solve the problem, the present invention amplifies the audio signal input directly from the audio source.

A direct sound signal amplification and reproduction device for reproducing, a delay circuit for delaying the acoustic signal branched from the acoustic source for a predetermined time, a reverberant sound generating circuit connected in series with the delay circuit and further having a feedback circuit, and a reverberant sound generating circuit. A reverberation signal amplification and reproduction device is provided to amplify and reproduce only the reverberant signal output from the generation circuit. The device directly amplifies and reproduces the sound as sound. At the same time, the acoustic signal is given a predetermined delay time by a delay circuit, is input to a reverberation sound generation circuit, and is outputted from the reverberation sound generation circuit as a reverberation sound signal. The remaining 1
The f signal is amplified and reproduced by a reverberant sound signal amplification and reproduction device which is provided separately from the direct sound signal amplification and reproduction device. Therefore, the direct sound and the reverberant sound are emitted simultaneously from different playback devices, and the listener experiences a localization effect that makes the sound source feel far away, and the sound of the instrument being played or the vocals. At the same time, you can obtain the reverberant sound effect that spreads throughout the space.

EXAMPLE An example of the present invention will be described below with reference to the drawings. That is, the audio device IO according to this embodiment includes a player and a tuner 11 as audio sources, and a direct sound signal system 13 and a remaining 11f signal are connected to the output side of a preamplifier 12 to which audio signals are input from the player and tuner 11. A branch system 14 is provided. The direct sound signal system 13 includes a first main amplifier 15 including a direct sound signal amplification device for amplifying the sound signal directly input to this system, that is, a direct sound signal 81't, and a first main amplifier 15 including the iX1 main amplifier 15. Directly input and play the next direct sound signal S1! A first speaker 16 is provided as an If reproducing device. On the other hand, the reverberant sound signal system 14 is provided with a first delay circuit 17 having a delay time T1 of 0.4 m11 to 50 ms and made of a charge transfer device such as 8BD or COD. The reason why the delay time T1 is set as described above is as follows.

That is, regarding human sound direction perception, an effect called the first wavefront law (Haas effect) is generally known.

This is a law regarding human auditory characteristics that states that when two identical sounds arrive at the ear from different directions with a time difference, the sound is localized and heard in the direction of the preceding sound. The time difference region where the Haas effect occurs is #! There is i2, but it is approximately 0.4 m
If the time difference is shorter than this, the sound will be localized between the arrival directions of the two sounds, and if the time difference is long, the sound will be heard as two separate sounds. It is also known that there is a close relationship between the perception of distance to the sound source and reverberation, and the difference between sound in an anechoic chamber and sound in a reverberant room is
It is said that a room with reverberation gives a sense of distance. Generally, the room in which the f-resonance device 10t is placed is likely to have reverberation, so the time difference region (0.4 to 40 m
9 delay time Tl (0,4ms) with more margin than s)
--50ms) is set.

For this reason, the delay time T1 is set, and the reverberation sound generation circuit 18 is connected in series to the first delay circuit 17. The reverberation sound generation circuit 17 includes a feedback circuit 19, a second delay circuit J connected to the feedback circuit 19, and a level adjuster 21, as shown in FIG. The second delay circuit adds BAD, C
A variable type delay circuit consisting of a charge transfer element such as an OD, which has a delay time shorter than that of the first delay circuit, for example, 1
m adjustment is possible below ms. The 7tf acoustic signal, that is, the reverberant signal S2 outputted from the reverberant sound generation circuit 18, is sent to the second speaker 2 of the reverberant signal reproducing device via the second main amplifier ρ that follows the reverberant signal amplification device.
3 is entered. This second speaker is connected to the listener and the first speaker.
It is provided at a predetermined displacement of about 45 degrees to about 900 degrees, for example, at a position of 6o0 with respect to the line segment connecting the speakers.

In this example of real power with the above configuration, the player, the
The 7'ef sound signal output from the syringe 11 through the cipher amplifier 12 is branched into the K onomatopoeic signal system 13 and the reverberant sound signal system 14. The acoustic signal input to the direct sound signal system 13, that is, is amplified by the direct sound signal system main amplifier 15, and is transmitted to the first speaker 16.
It will be regenerated. On the other hand, the acoustic signal inputted to the reverberant sound signal system 14 is sent to the first delay circuit 1 as shown in the lsa diagram.
7 and is given an *i delay time T1, the signal is input to the reverberation sound generation circuit 18. Further, the acoustic signal is applied to the delay time Tz' in the reverberation sound generation circuit 18,
It is attenuated by the level adjuster 211C and fed back to the input IK via the feedback circuit 19t-. By repeating this process with the delay time T2), the desired reverberant sound signal S2 is obtained. The reverberant sound signal S
2 is amplified by the second main amplifier 22), reproduced and radiated by the second speaker 23. At this time, the delay time is set between 0.4m8 and 50ms using the noise effect mentioned above. Therefore, when this acoustic device is arranged, direct sound from the first speaker 16 and reverberant sound from the second speaker are simultaneously radiated into the skin layer. At this time, since the delay time of the first delay circuit 17 is set to 1 in consideration of the Haas effect as described above, the sound emitted from each speaker 16, Z3 is The sound image located in between will not be heard as two separate sounds, and the sound image will be localized on the side of the first speaker 16 that emits the reproduced sound to which no delay time is added. Moreover, at this time, the listener's ears hear the reverberant sound coming from the side of the first speaker 16, and the listener also hears the reverberant sound coming from the first speaker 16 on the side wall of the concert hall. This creates an illusion that the sound is being reflected and heard, and as soon as the first speaker 16 is localized, it sounds as if it were far away from the actual location.

Also, the direction in which the reverberant sound comes from is such that as soon as the first speaker is displaced from its predetermined position, it is radiated from the second speaker field. It can be heard as a reverberant sound with a sense of spaciousness. Listeners do not only feel that the distance to the sound source is far away, but also the distance from the instrument being played, due to the direct sound that provides sound image localization and the reverberant sound that is heard from the side at the same time as the direct sound. You can achieve the effect of expanding the space in which you can hear the sounds and vocals.

In addition, the R delay time (feedback time) of the second delay circuit J provided in the reverberation sound generation device 18 and the level adjuster 21
By adjusting the amount of attenuation (feedback level) and adjusting the position of the second speaker that generates reverberant sound, the sense of distance to the sound source can be freely controlled. In the above embodiment, the symbol 9 indicates a monaural playback device, and if this device is used for each channel of the stereo playback device,
Adjustment of the feedback time and feedback level mentioned above, and speaker position for reverberation! ! It goes without saying that the sound image localization and the sense of sound spread can be controlled by the j1 adjustment.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention provides a device for amplifying and reproducing a friendly sound signal, that is, a direct sound signal output from an f4il source, and a reverberant sound signal having a predetermined time delay with respect to the direct sound signal. The KLI is equipped with a device that amplifies and reproduces the sound, and radiates direct sound and reverberant sound from different reproduction sources. Therefore, unlike conventional reverberation devices, reverberation is not added to the direct sound during emission, and the state is very close to the state in which reverberation is heard when it is reflected off walls, etc., making it difficult to obtain clear sound image localization. This creates the effect that the distance to the sound source appears to be farther away than the actual position of the speaker. or,
Since the second speaker is installed and radiates at the next position with respect to the line segment connecting the first speaker and the listener, the effect of expanding the space in which the sound and sound of the instruments being played can be heard is obtained. I can do it. Furthermore, when this device is used for stereo reproduction, the above-mentioned effect of making the sound source seem far away can further increase the sense of sound spread.

In addition, in the above embodiment, the delay time t-0 of the first delay circuit is set to 4 ms or more and 50 ms or less, and the second
Since the delay time of the delay circuit is set to less than fc1ms, clear sound image localization can be obtained on the speaker side where sound is directly reproduced by the Haas effect.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of the present invention, FIG. 2 is a block diagram showing an example of a reverberant sound generation circuit of the same example, and FIG. 3 is an explanatory diagram showing the operation of the same example. FIG. 4 is a block diagram showing a conventional reverberation sound adding device. “10...Sound equipment, 11...Player, tuner (
(acoustic source), 15--first main amplifier (onomatopoeic signal amplification device), 16--first speaker (direct sound signal reproducing device), 17--first delay circuit, 18--reverberation Sound generation circuit, 19... feedback circuit, m...
Second delay circuit, n... second main amplifier (reverberant sound signal amplification device), n... second speaker (reverberant sound signal amplification device). r Old Figure 3 Figure 4 procedural amendment (voluntary) February 2711, 1972

Claims (3)

[Claims] (1) a direct sound reproduction device that amplifies and reproduces an audio signal input from an appropriate audio source; a delay circuit that delays an audio signal branched and input from the audio source for a predetermined time;
An acoustic device comprising: a reverberant sound generating circuit connected in series to the delay circuit; and a reverberant sound reproducing device that amplifies and reproduces only the reverberant sound signal inputted from the residual sound generating circuit. (2) The delay circuit is a first delay circuit and a second delay circuit, and the first
2. The acoustic device according to claim 1, wherein the delay time of said delay circuit is set to a value of 0.4 ms or less to 50 ms or less, and the delay time of said second delay circuit is set to a value of 1 ms or less. (3) Claim 1, characterized in that the speaker that reproduces the sound from the reverberant sound reproduction device is displaced by a predetermined angle with respect to the speaker that reproduces the sound from the direct sound reproduction device. sound equipment.