JPH05227588A - Acoustic reproducer - Google Patents

Abstract

PURPOSE:To obtain a natural sound feeling by eliminating the sense of incompatibility at the time of listening by obtaining a music signal having a spectrum distribution like a sound existing in nature. CONSTITUTION:The system is provided with a spectrum analizer 1 analizing the audible band frequency component of the music signal, a higher harmonic component generating circuit 2 preparing a higher harmonic component from the music signal, an electronic control graphic equalizer 3 controlling the spectrum and the level of the output of the higher harmonic component generating circuit in accordance with the spectrum in an audible band to set it to be non- audible band higher harmonic component, a microcomputer 4 controlling the frequency characteristic and the gain of the electronic control graphic equalizer 3 in real time with the output of the spectrum analizer 1, and an adding circuit 5 adding the non-audible band higher harmonic component and the original music signal to set it to be an output signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound reproducing device which allows a listener to perceive a sense of sound that has hitherto been unrecognizable.

[0002]

2. Description of the Related Art In a conventional sound reproducing device such as a stereo, in order to reduce the distortion level of reproduced sound as much as possible, generally, efforts are made to improve the linearity of an amplifier or the like.

[0003]

A conventional sound reproducing device having such a structure is, for example, 20 KHz or more for a CD as a program source and 22 KH for a DAT.
Since a signal in which frequency components above z are cut due to the characteristics of the media is reproduced faithfully,
Listeners will not be able to detect harmonic components outside the audible range that are contained in normal sounds in the natural world. There was a problem to be solved that we felt unnatural in different spectrum distributions.

Therefore, in order to solve the drawbacks of the conventional example, the present invention does not disturb the original frequency component of the music signal from the program source illustrated above,
Reproduction of a spectrum distribution closer to the natural world by creating a harmonic component outside the audible band that has been cut or whose level has dropped and adding it to the music signal in association with the distribution of the frequency component of the original music signal. It is an object of the present invention to provide a sound reproducing device that can obtain a sound and can bring a pleasing effect more than before.

[0005]

A sound reproducing apparatus according to the present invention for achieving the above object will be described with reference to FIGS. 1 to 7 showing an embodiment. The first invention is to hear an audio signal. Spectrum analyzer 1 for analyzing frequency components in the band
And a harmonic component generation circuit 2 for generating a harmonic component from the music signal, and a spectrum and level of the output of the harmonic component generation circuit 2 corresponding to the spectrum in the audible band detected by the spectrum analyzer 1. An electronically controlled graphic equalizer 3 having an out-of-audible harmonic component, a microcomputer 4 for controlling the frequency characteristic and gain of the electronically controlled graphic equalizer 3 in real time by the frequency component output of the spectrum analyzer 1, and the electronically controlled graphic equalizer. 3 is a sound reproducing device characterized by comprising an adding circuit 5 for adding an out-of-audible band harmonic component output from the device 3 and an original music signal to obtain an output signal.

The second invention is a harmonic component generating circuit 2 for generating a harmonic component outside the audible frequency band from a music signal.
And an electronic control graphic for controlling the spectrum and level of the output of the harmonic component generating circuit 2 in accordance with the spectrum of the output signal obtained by adding the harmonic component outside the audible frequency band to the music signal to obtain the harmonic component outside the audible band. Equalizer 3
And an adder circuit 5 for adding the audible out-of-band harmonic component output from the electronically controlled graphic equalizer 3 and the original music signal as an output signal, and a frequency component of the output signal from the adder circuit 5. Sound reproduction comprising a spectrum analyzer 1 for controlling the frequency characteristics and gain of the electronically controlled graphic equalizer 3 by feeding back the spectrum information of the output signal detected by the spectrum analyzer 1. It is a device.

[0007]

The sound reproducing device having such a configuration is inserted into an amplifying system such as a stereo device, and an amplifier and a speaker having a reproducing band sufficiently wider than the audible band are provided, so that the CD and DAT can be started. Therefore, it is possible to synthesize and add the audible out-of-band harmonics to the music signal that does not include the out-of-audible harmonics or has a lowered level due to the characteristics of the transmission medium.

As a result, it is possible to obtain a reproduced sound having a frequency distribution close to that of the natural world, eliminate the above-mentioned subconscious sense of incongruity, and greatly improve the pleasant effect in music appreciation.

An example of synthesizing and adding audible out-of-band harmonics using a CD as a program source will be described. In the first invention, the spectrum of a music signal at a certain time is a frequency component of 20 KHz or more as shown in FIG. If the spectrum is lacking, the output of the harmonic component generation circuit 2 shown by the dotted line in FIG. 4 is output by the electronically controlled graphic equalizer 3 controlled by the microcomputer 4 outside the audible band of the spectrum shown by the solid line in the figure. Control so that harmonics are generated.

The out-of-audible harmonics are added to the music signal by the adder circuit 5 to form an output signal having a spectrum as shown in FIG. 5, and the microcomputer 4 outputs the music signal obtained by the spectrum analyzer 1. Based on the spectrum information, the spectrum of the out-of-audible harmonics forms an envelope that is continuous with the spectrum of the music signal in the vicinity of the boundary of 20 KHz, and the level decreases in inverse proportion to the frequency as the frequency increases. The electronically controlled graphic equalizer 3 is controlled in real time so as to have such a shape.

In the second invention, the spectrum of the combined output signal is detected by the spectrum analyzer 1 and the spectrum information is fed back to the electronically controlled graphic equalizer 3 via the microcomputer 4 to obtain the spectrum shown in FIG. Then, the electronically controlled graphic equalizer 3 is controlled.

The above-mentioned spectrum and level of the audible out-of-band harmonics are examples based on the results of experiments, and naturally different spectrums and levels are required for different music signals. In this case, the program of the microcomputer 4 is required. Can be changed. Generally, a plurality of programs corresponding to various music signals are stored in the microcomputer 4
You can register it in and select it as needed.

[0013]

FIG. 1 is a block diagram of an embodiment of the first invention, in which an input music signal ei is divided into two, one of which has spectrum information detected by a spectrum analyzer 1 as it is, and an adding circuit to be described later. Similarly, an out-of-audible harmonic component ehh, which will be described later, is added by 5 and output as an output signal eo.

The other half is input to the harmonic component generating circuit 2 consisting of a non-linear circuit, one example of which is shown in FIG. 6, and the spectrum is shown by the dotted line in FIG. 4 due to the non-linearity. , A signal eho containing many harmonic components. The non-linear circuit shown in FIG. 6 uses a diode and has a property that impedance varies depending on the polarity of a signal, but another configuration having an equivalent function may be used.

The signal eho is input to an electronically controlled graphic equalizer 3 which is controlled by a microcomputer 4 which operates based on the spectrum information of the music signal ei output from the spectrum analyzer 1, and its spectrum and gain are adjusted. The audible out-of-band harmonic component ehh is shown by the solid line in Fig. 4.

The electronically controlled graphic equalizer 3 may have a well-known configuration that is generally used. As an example shown in FIG. 7, a filter group 3a for dividing a frequency band outside the audible band into a plurality of bands, and It is composed of a plurality of electronic volume groups 3b individually connected to the filter and to which the control output from the microcomputer 4 is input, and a synthesizing circuit 3c for adding the output of each electronic volume.

The output of the electronically controlled graphic equalizer 3 and the music signal ei are added by an adder circuit 5,
The output signal eo is output. FIG. 5 shows the spectrum of the output signal eo.

FIG. 2 is a block diagram of the second invention, in which the spectrum analyzer 1 is connected to the output section, detects the spectrum of the output signal eo, and returns the spectrum information to the electronically controlled graphic equalizer 3 via the microcomputer 4. Then, the electronically controlled graphic equalizer 3 is controlled so as to obtain the spectrum shown in FIG. In the second invention, the first invention merely analogizes the audible out-of-band harmonic components from the audible band spectrum and simply adds them, but actually monitors the out-of-band harmonic components as well. It is characterized by being adjusted more accurately.

The spectrum analyzer 1, the microcomputer 4, and the adder circuit 5 used in the above first and second inventions may have the well-known conventional structure together with the electronically controlled graphic equalizer 3.

The sound reproducing apparatus according to the present invention has been described above in detail based on the considered typical embodiments. However, the embodiment of the sound reproducing apparatus according to the present invention is not limited to the structure of the above embodiment. However, the present invention can be appropriately modified and implemented as long as it has the constituent features described in the above-mentioned claims, exhibits the function of the present invention, and has the effects described below.

[0021]

[Effect] The sound reproducing device according to the present invention has the following effects. (1) The spectrum structure of reproduced sound can be approximated to the spectrum structure of normal sound in the natural world. Therefore, the naturalness of the reproduced sound is increased in terms of hearing, and the sound quality is improved. (2) The spectrum of audible out-of-band harmonics can be changed and adjusted by the function of the microcomputer. Therefore, any program source can be used. Therefore, the effect on the reproduced sound can be further enhanced. (3) Since the spectrum of the original music signal is not changed, the timbre of the original sound can be faithfully maintained in the audible band.

With the above advantages, it is possible to obtain a reproduced sound having a frequency distribution close to that of the natural world at the time of listening to eliminate the discomfort existing under the subconscious and to greatly improve the pleasant effect in listening to music. It has the effect of.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first invention of the present application.

FIG. 2 is a configuration diagram of a second invention of the present application.

FIG. 3 is a spectrum characteristic diagram of an input signal.

FIG. 4 is a spectrum characteristic diagram of out-of-band harmonic components.

FIG. 5 is a spectrum characteristic diagram of an output signal.

FIG. 6 is a specific configuration diagram of a harmonic component generation circuit.

FIG. 7 is an explanatory schematic diagram showing an example of the configuration of an electronically controlled graphic equalizer.

[Explanation of symbols]

 1 Spectrum analyzer 2 Harmonic component generation circuit 3 Electronically controlled graphic equalizer 4 Microcomputer 5 Adder circuit

Claims (2)

[Claims] 1. A spectrum analyzer (1) for analyzing frequency components in an audible band of a music signal, and a harmonic component generation circuit (2) for generating a harmonic component from the music signal,
An electronically controlled graphic equalizer (3) for controlling the spectrum and level of the output of the harmonic component generation circuit (2) in response to the spectrum of the audible band detected by the spectrum analyzer (1) to obtain the out-of-audible band harmonic component. A microcomputer (4) for controlling the frequency characteristic and gain of the electronically controlled graphic equalizer (3) in real time by the frequency component output of the spectrum analyzer (1), and an audible output from the electronically controlled graphical equalizer (3). A sound reproducing device comprising an adding circuit (5) for adding an out-of-band harmonic component and an original music signal to obtain an output signal. 2. A harmonic component generation circuit (2) for creating a harmonic component outside the audible frequency band from a music signal, and a spectrum of an output signal obtained by adding a harmonic component outside the audible frequency band to the music signal. An electronically controlled graphic equalizer (3) that controls the spectrum and level of the output of the harmonic component generation circuit (2) to generate an out-of-audible harmonic component,
An adder circuit (5) for adding an out-of-audible band harmonic component output from the electronically controlled graphic equalizer (3) and the original music signal into an output signal, and the adder circuit (5)
Spectrum analyzer (1) for analyzing the frequency component of the output signal from the
A sound reproducing device comprising a microcomputer (4) for feeding back the spectrum information of the output signal detected by the above and controlling the frequency characteristic and the gain of the electronically controlled graphic equalizer (3).