JPS61203496A - Sound reproducer - 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 relates to a pre-meeting playback device, and more particularly to a blue-tatami playback device that has been improved to provide a high level of auditory realism.

[Conventional technology]

Conventional music playback devices utilize two systems of sound from a pair of speaker systems placed in front of the viewer.
The direction, depth, and
Feel the spaciousness, richness, etc. and the system stereo effect (realism)
I am getting .

On the other hand, there are attempts to increase the sense of presence without relying on a pair of speakers placed in front of the viewer. An example is a head 7-on system in which a pair of speakers are arranged so as to be in contact with both ears.0 [Problems to be Solved by the Invention] However, with the above-mentioned conventional playback device, (1) in the case of a demonstration; Although the sound source of an instrument is one point,
Reproduction is based on the fact that an apparent point sound source is created using a pair of distant speakers; (2) The spatial characteristics (size, structure, etc.) of the auditorium and the surroundings of the audience's ears are ), and the compositional distribution of reflected waves and other sounds arriving at the viewing position are different, making it difficult to obtain the desired sense of realism. For this reason, some improved examples include an auxiliary speaker that reproduces only the reflected waves and a signal circuit that extracts the reflected waves, but in this example, the directional processing is performed over the entire frequency band of the four reflected waves, so the resulting There was a limit to the sense of realism.

With the head 7-on system, the left and right discrimination of the direction of sound arrival, that is, the lateral localization, is much better than that with the front-placed speakers described above, but the sound image is formed in the head, making it difficult to distinguish between the left and right. Other than that, the sense of realism is extremely poor.

In other words, there is a limit to the sense of realism that can be obtained even with a playback device with 7 heads on.

[Means for solving problems]

The present invention is characterized in that out of the two conventional signals of direct waves and reflected waves, the reflected wave in particular is divided into appropriate frequency bands and a different delay is added to each band. An additional device is used to create an effective combination pattern of direct waves and reflected waves that enhances the sense of presence in the listening room or the space around both ears.

The sound reproduction device of the present invention includes a signal separation circuit that separates the direct wave and the reflected wave from a pre-recorded input signal reproduced from a recording medium recorded so that the direct wave and the reflected wave can be separated, and the reflected wave. a frequency divider that divides the signal into a plurality of frequency bands, a plurality of delay time adding devices that add delay times to the signals of each frequency band divided by the frequency divider, and outputs of the direct wave and the delay time adding device. An amplifier to amplify the signal and an electric to convert this output to a tone output.
It has a sound 111f conversion device.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 shows only one side channel of an embodiment of the present invention, and 1 is an input signal reproduced from a recording medium on which a direct wave 11 and a reflected wave 12 are recorded so that they can be separated. A signal separation circuit that separates the direct wave 11 and the reflected wave 12; 2 is a frequency divider that divides the reflected wave 12 into n appropriate frequency bands; 3-1, 3-2,...
3-n is a delay time adding device, 4 is a signal mixer, 5 is an amplifier, and 6Fi head 7 is an on-type speaker. This is based on the empirical rule that in a real hall, the reverberation time for sounds in the audible band of 500Hz to 1000Hz is preferably about 2 seconds because it gives a high sense of reality, and also the reverberation time of 125Hz to 250Hz in the audible range.
The sound reproducing device is realized based on the rule of thumb that it is preferable that the ratio of the reverberation time of the low frequency range to the mid-low frequency range of 500) 1 Hz to 1000 Hz to be around 1.2 gives a high sense of realism.

Next, to explain its operation, the reflected wave 12 is divided into frequency bands with a good delay time by the divider 2, and an appropriate delay time is added to each band using delay time adding devices ff113-1 to 3-nK. Add. After that, the delayed reflected wave 12 and the direct wave 11 are mixed by the mixer 14 and amplified and reproduced by the amplifier 5, so that an acoustic output with an appropriate delay can be obtained for each frequency band, and as a result, the This is brought about by the effect of being able to reproduce the sense of realism.

Note that, since this embodiment is a sound reproduction device using headphones, there is one pair of speakers, but a reproduction device using a device other than the head 7 on is also conceivable. In this case, there may be two pairs of speakers, one in the front and one in the rear, or if six pairs are configured using a so-called multi-amplifier system in which separate amplifiers and speakers are used for each frequency band, higher fidelity and higher performance can be achieved. Creates a sense of realism.

〔Effect of the invention〕

As explained above, the present invention splits the direct wave and the reflected wave, adjusts the frequency band and delay time of the reflected wave, and combines the direct wave and the reflected wave depending on the viewing location. It has the effect of being able to reproduce a high degree of realism.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention. ... Delay time addition device, 4 ... Signal mixer, 5 ... Amplifier, 6 ... Headphone type speaker, 11.
...Direct wave, 12...Reflected wave. Agent: Patent Attorney Susumu Uchihara
\12. 2 ゛＼こ、-・ Figure 1 4: Signal mixer 5 = Amplification number

Claims (1)

[Claims] a signal separation circuit that separates the direct wave and the reflected wave from an acoustic input signal reproduced from a recorded recording medium so that the direct wave and the reflected wave can be separated; and a frequency that separates the reflected wave into a plurality of frequency bands. a divider, a plurality of delay time adding devices that add delay times to signals for each frequency band divided by the frequency divider, an amplifier that amplifies the direct wave and the output signal of the delay time adding device, and an output thereof. A sound reproducing device comprising: an electric-acoustic conversion device that converts an electric signal into a sound output;