JP4422941B2 - Sound field adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sound field adjusting device, and more particularly, to a sound field adjusting device that creates two or three systems of music signals having a sense of spread and depth from one system of music signals.
[0002]
[Prior art]
The mobile phone has a function of playing an incoming melody sound when a call is received and notifying the user of the incoming call. The user can create a desired incoming melody music signal data by key operation and register it in the memory. FIG. 7 shows a configuration diagram of a ringtone melody sound reproduction system of a conventional mobile phone. When the incoming call detection circuit 2 detects an incoming call, the controller 3 reads the incoming melody music signal data from the memory 1 and outputs it to the D / A converter 5 to convert it into an analog incoming melody music signal. The analog ringing melody music signal is amplified by the power amplifier 6 and then reproduced by the speaker 7.
[0003]
[Problems to be solved by the invention]
However, in the conventional mobile phone ringtone melody playback system described above, since there is only one speaker 7, only a monaural ringtone melody music signal can be played, and a sense of breadth and depth cannot be expressed. . Moreover, even if a plurality of speakers 7 are installed, it is difficult for the user to create a ringtone melody music signal data by key operation, so that it is difficult to express a sense of breadth and depth.
An object of the present invention is to provide a sound field adjustment device that can create a plurality of music signals with a sense of spread and a depth from one music signal in view of the above-described problems of the prior art.
[0004]
[Means for Solving the Problems]
According to the first aspect of the present invention, the system dividing means for systematically dividing the music signal of one system to generate the first, second and third system music signals, and the second system music signal among the three systems of music signals Increases the pitch (lower), the pitch conversion means for lowering (higher) the pitch of the third system music signal, and the first system music signal on the time axis than the second system music signal and the third system music signal. The time axis adjustment means for adjusting the time axis so as to be relatively ahead, the pitch conversion means converts the pitch, and the time axis adjustment means adjusts the time axis to add the second system music signal and the first system music signal And a second addition unit for adding the third system music signal and the first system music signal after the pitch is converted by the pitch conversion unit and the time axis is adjusted by the time axis adjustment unit . It is characterized by that.
According to a second aspect of the present invention, the time axis adjustment means adjusts the time axis so that the second system music signal precedes the third system music signal relatively on the time axis .
In 請 Motomeko 3, pitch conversion means is a 1 in the range of 1 to 10 minutes 20 minutes semitone, the pitch of the second system the music signal raised (lowered), lower the pitch of the music signal of the third system It is characterized by (high).
According to a fourth aspect of the present invention, there is provided a volume balance adjusting means for adjusting a volume balance among the first system music signal, the second system music signal, and the third system music signal.
According to a fifth aspect of the present invention , reverberation component adding means for adding reverberation components to at least the second system music signal and the third system music signal among the first system music signal, the second system music signal, and the third system music signal is provided. It is characterized by that.
According to a sixth aspect of the present invention, reverberation component adding means for adding a reverberation component to the one system of music signals is provided before the system dividing means.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, one embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the structure of a ringtone melody sound reproduction system for a mobile phone according to the present invention.
Reference numeral 1 denotes a memory in which a monophonic digital ringing melody music signal is stored, and the digital ringing melody music signal is obtained by communication from the outside even if the user creates a key operation with a mobile phone. There may be. 2 is an incoming call detection circuit for detecting an incoming call, and 3 is a controller having a microcomputer configuration. When the incoming call detection circuit 2 detects an incoming call, a digital incoming melody music signal is read from the memory 1 and a sound field adjusting circuit to be described later And the sound field adjustment processing is executed in the digital domain to output three systems of first to third digital music signals. Reference numeral 4 denotes a sound field adjusting circuit composed of a DSP (digital signal processor). Among these, 4a is a system division for system-dividing one system of music signals into three systems of first, second and third digital music signals. Means 4b are time axis adjusting means for adjusting the time axis between the first, second and third digital music signals. The first digital music signal is on the time axis more than the second and third digital music signals. (In addition, the second digital music signal may relatively precede the third digital music signal on the time axis). 4c is a volume balance adjusting means for adjusting the volume balance of the first, second and third digital music signals of the three systems, and 4d is the second digital music among the first, second and third digital music signals of the three systems. Pitch conversion means for converting the pitch of the signal and the third digital music signal.
[0006]
The system dividing means 4a branches the input digital incoming melody music signal into three and outputs it as first, second, and third digital music signals. The time axis adjusting means 4b outputs the second digital music signal delayed by the delay time τ1 by the delay unit 11 and outputs the third digital music signal delayed by the delay time τ2 by the delay unit 12. The volume balance adjusting means 4c has a multiplier 21 for changing the level of the second digital music signal and a multiplier 22 for changing the level of the third digital music signal. Volume balance adjustment is performed by multiplying the third digital music signal by multiplication coefficients a and b of 1 or less, respectively. The pitch conversion means 4d does not change the pitch of the first digital music signal, changes the pitch of the second digital music signal by the conversion amount P1 by the pitch conversion unit 31, and converts the pitch of the third digital music signal by the pitch conversion unit 32. Change only P2. As for P1 and P2, when one increases the pitch, the other is set to a value that decreases the pitch. P1 and P2 are preferably set in a range of 1/20 to 1/10 of a semitone. OUT1 is a first digital music signal output terminal, OUT2 is a second digital music signal output terminal, and OUT3 is a third digital music signal output terminal.
[0007]
Reference numeral 40 denotes a system conversion circuit for converting three music signals into two music signals. Among them, 41 adds the first digital music signal and the second digital music signal to create an L channel digital music signal. An adder 42 is an adder for adding the first digital music signal and the third digital music signal to create an R channel digital music signal. Reference numeral 50 denotes a D / A conversion circuit that converts a digital music signal into an analog music signal. Among these, 51 is a D / A converter that creates an L channel analog music signal by D / A converting the L channel digital music signal. , 52 is a D / A converter for creating an R channel analog music signal by D / A converting the R channel digital music signal. 61 is a power amplifier that amplifies the power of the L channel analog music signal, 62 is a power amplifier that amplifies the power of the R channel analog music signal, 71 is an L channel speaker driven by the output of the power amplifier 61, and 72 is a power amplifier 62. R channel speaker driven by the output of
[0008]
As shown in FIG. 2, the mobile phone has a first housing 81 having a liquid crystal display panel 80 on the inside and a second housing 82 having various keys on the inside, which are connected to each other by a hinge 83 so as to be freely opened and closed (turned). Among these, an L channel speaker 71 and an R channel speaker 72 are incorporated as external speakers on the left and right sides of the first casing 81 on the back side.
[0009]
Next, the operation of the above embodiment will be described.
The controller 3 sets parameters in each part of the volume adjustment circuit 4 when the mobile phone is turned on. Specifically, for example, τ1 is 150 ms, τ2 is 300 ms, a is 0.6, b is 0.4, P1 is one tenth higher than a semitone, and P2 is one tenth lower than a semitone. (Note that these values are examples, and other combinations may be used).
When the incoming call detection circuit 2 detects an incoming call, the controller 3 reads the digital incoming melody music signal from the memory 1 and outputs it to the sound field adjustment circuit 4. In the sound field adjustment circuit 4, first, the digital incoming melody music signal is divided into three systems by the system dividing means 4a, and the first, second, and third digital music signals are created. These three systems of the first, second and third digital music signals are shifted by 150 ms on the time axis and output by the time axis adjusting means 4b. Then, the level of the second digital music signal is multiplied by 0.6 and the level of the third digital music signal is multiplied by 0.4 by the volume balance adjusting means 4c. Further, the pitch converting means 4d increases the pitch of the second digital music signal by 1/10 of a semitone and decreases the pitch of the third digital music signal by 1/10 of a semitone.
[0010]
As a result, the first digital music signal is output from OUT1 as the digital ringing melody music signal input from the controller 3, is delayed by 150 ms from the first digital music signal, the level is 0.6 times, and the pitch is 10 minutes. The second digital music signal that is raised by 1 is output from OUT2, delayed by 300 ms from the first digital music signal, the level is 0.4 times, and the pitch is lowered by 1/10. A signal is output from OUT3.
[0011]
Since there are two external speakers installed in the mobile phone, the L channel speaker 71 and the R channel speaker 72, the three first, second and third digital music signals are converted into two by the system conversion circuit 40. Is done. That is, the adder 41 adds the first digital music signal and the second digital music signal to create an L-channel digital music signal, and the adder 42 adds the first digital music signal and the third digital music signal. A channel digital music signal is created.
[0012]
The L channel digital music signal is converted into an L channel analog music signal by the D / A converter 51 of the D / A conversion circuit 50, amplified by the power amplifier 61, and then reproduced by the L channel speaker 71. The R channel digital music signal is converted into an R channel analog music signal by the D / A converter 52 of the D / A conversion circuit 50, amplified by the power amplifier 62, and then reproduced by the R channel speaker 72.
As a result, the sound output from the L channel speaker 71 and the sound output from the R channel speaker 72 include the original incoming melody music signal stored in the memory 1 and the time axis from the original incoming melody music signal. Since a component shifted in the direction and shifted in pitch (the second music signal component on the L channel side and the third music signal component on the R channel side) is also included, reverberation and chorus (detune) can be exhibited. In addition, the sound output from the L channel speaker 71 and the sound output from the R channel speaker 72 differ in the amount of deviation in the time axis direction of the component added to the original ringing melody music signal, and the pitch is changed. Since the directions are also different, there is a feeling of separation between the L channel and the R channel. Therefore, a feeling of spread and a feeling of depth are born in the incoming melody sound.
[0013]
In the above example, τ1 is set to 150 ms and τ2 is set to 300 ms. However, this is an example, and in the range of 0 <τ1 ≦ 500 ms and 0 <τ2 ≦ 500 ms, τ1 = τ2 = 250 ms or τ1 = 250 ms. , Τ2 = 500 ms, τ1 = 300 ms, τ2 = 150 ms, τ1 = 500 ms, τ2 = 250 ms, or other values. Preferably, τ1 and τ2 are set within a range of 0 <τ1 ≦ 250 ms and 0 <τ2 ≦ 500 ms, or τ1 and τ2 are set within a range of 0 <τ1 ≦ 500 ms and 0 <τ2 ≦ 250 ms. .
Further, although a = 0.6 and b = 0.4 are set, other values may be used. For example, when τ1 <τ2 is set, a = 0 in a range of 1>a>b> 0. .7, b = 0.3, or a = 0.8, b = 0.2. On the other hand, when setting τ1> τ2, in the range of 1>b>a> 0, a = 0.4, b = 0.6, a = 0.3, b = 0.7 Or a = 0.2 and b = 0.8. Also, when setting τ1 = τ2, within the range of 1>a> 0, 1>b> 0, a = b = 0.5, or a = 0.6, b = 0.4. It may be set, or a = 0.4 and b = 0.6.
Furthermore, although P1 is set to a value that increases 1/10 of a semitone and P2 is set to a value that decreases 1/10 of a semitone, P1 is set to a value that increases 1/20 of a semitone, and P2 is set to a value of 1/20 of a semitone. A value that lowers, or a value that lowers P1 by one tenth of a semitone, a value that increases P1 by one tenth of a semitone, or a value that lowers P1 by one twenty of a semitone. , P2 may be set to a value that is 1 / 20th of a semitone. Furthermore, P1 is set to a value that increases 1/10 of a semitone, P2 is set to a value that decreases 1/20 of a semitone, P1 is set to a value that increases 1/20 of a semitone, and P2 is set to 1/10 of a semitone. A value that lowers, or a value that lowers P1 by 1/10 of a semitone, a value that increases P2 by 1/20 of a semitone, or a value that decreases P1 by 1/20 of a semitone. , P2 may be set to a value that is one tenth higher than a semitone. In short, when a value for increasing (decreasing) the pitch is set in P1, a value for decreasing (increasing) the pitch may be set in P2, and the amount variable from the original pitch is 10 minutes of a semitone. It is preferably about 1 to 20 times.
[0014]
According to the above-described embodiment, the original incoming melody music signal stored in the memory 1 is input to the sound field adjustment circuit 4 and the first, second, and third music signals are input by the system dividing means 4a. The system is divided into three systems, and the first music signal is made to precede the second and third music signals on the time axis by the time axis adjusting means 4b. It may be relatively preceded on the time axis from the signal), and after adjusting the volume balance between the systems by the volume balance adjusting means 4c, the pitch of the second music signal is further increased (lowered) by the pitch converting means 4d. The pitch of the third music signal is lowered (increased). Then, the first music signal and the second music signal are added together to reproduce sound from the L channel speaker 71 as an L channel music signal, and the first music signal and the third music signal are added together as an R channel music signal. 72, the sound output from the L channel speaker 71 and the sound output from the R channel speaker 72 are shifted in the time axis direction from the original ringing melody music signal and the ringing melody music signal. Since a component with a shifted pitch is included, a reverberation feeling and a chorus feeling (detune) can be exhibited. In addition, with the sound output from the L channel speaker 71 and the sound output from the R channel speaker 72, The direction of change in the pitch of the component added to the original incoming melody music signal (or the amount of deviation in the time axis direction) Since Tsu both changing direction of the switch) are different, separate sense of L and R channels occurs. Therefore, a feeling of spread and a feeling of depth are born in the incoming melody sound.
[0015]
In the embodiment described above, the system conversion circuit 40 provided separately from the sound field adjustment circuit 4 performs conversion from three systems to two systems, but the pitch conversion is performed in the sound field adjustment circuit 4. System conversion means may be provided after the means 4d, or a system conversion circuit having an analog circuit configuration may be provided after the D / A conversion circuit 50.
[0016]
In addition, since there are two external speakers mounted on the mobile phone, the L channel speaker 71 and the R channel speaker 72, the three systems of the first, second, and third music signals output from the sound field adjustment circuit 4 are system-converted. Although the circuit 40 converts the signal into two systems, when the mobile phone has three external speakers, the first, second, and third output from the sound field adjustment circuit 4 without system conversion. Each external speaker may be driven by each music signal.
[0017]
Specifically, as shown in FIG. 3, when the mobile phone is also provided with a C (center) channel speaker 73 in addition to the L channel speaker 71 and the R channel speaker 72, FIG. 1 is changed as shown in FIG. Instead of the system conversion circuit 40, a D / A converter 53 is added to the D / A conversion circuit 50A, and a power amplifier 63 that amplifies the output of the D / A converter 53 is also added. Then, the first digital music signal output from OUT1 of the sound field adjustment circuit 4 is input to the D / A converter 53 to be converted into a C channel analog music signal. After the power amplification by the power amplifier 63, the C channel speaker 73 is obtained. Drive. Also, the second digital music signal output from OUT2 of the sound field adjustment circuit 4 is input to the D / A converter 51 to be converted into an L channel analog music signal. After power amplification by the power amplifier 61, the L channel speaker 71 is converted. And the third digital music signal output from OUT3 of the sound field adjustment circuit 4 is input to the D / A converter 52 to be converted into an R channel analog music signal, amplified by the power amplifier 62, and then the R channel. The speaker 72 is driven.
[0018]
3 and 4, the sound output from the L channel speaker 71 and the sound output from the R channel speaker 72 are shifted in the time axis direction compared to the sound output from the C channel speaker 73. In addition, since the sound with the pitch shifted is output, the reverberation feeling and the chorus feeling (detune) can be exhibited. In addition, the sound output from the L channel speaker 71 and the sound output from the R channel speaker 72 are: Compared with the sound output from the C channel speaker 73, the change direction of the pitch (or both the shift amount in the time axis direction and the change direction of the pitch) is different, so that a sense of separation between the L channel and the R channel occurs. Therefore, a feeling of spread and a feeling of depth are born in the incoming melody sound.
[0019]
Further, as shown in FIG. 5, reverberation component adding means 4e is provided, for example, after the pitch converting means 4d of the sound field adjusting circuit 4A so as to add the reverberation components to each of the first to third digital music signals. Also good. Specifically, each of the first to third digital music signals is passed through reverberation component adding sections 80, 81, and 82 to add a reverberation component. For example, as shown in FIG. 6, the reverberation component adding unit 80 adds an output of a multiplier described later to the first digital music signal, and outputs the output of the adder 90 for a short time τ (τ is 5 ms, 10 ms, etc.). The delay unit 91 can be configured to be delayed and output externally, and the output of the delay unit 91 can be multiplied by a multiplication coefficient c smaller than 1 and output to the adder 90. The reverberation component adding units 81 and 82 may have the same configuration as the reverberation component adding unit 80.
As shown in FIG. 5, the reverberation component adding means 4e can be added to enrich the feeling of reverberation.
It should be noted that the reverberation component adding means 4e may be provided not in the subsequent stage of the pitch converting means 4d but in the previous stage, or in the previous stage of the volume balance adjusting means 4c. Alternatively, instead of the reverberation component addition means 4e, one reverberation component addition section similar to the reverberation component addition section 80 shown in FIG. 6 is provided on the input side of the sound field adjustment circuit 4 (the preceding stage of the system division means 4a). May be.
[0020]
Further, in the above-described embodiment and modification, the description has been given by taking the reproduction system of the ringtone of the mobile phone as an example. However, the present invention is not limited to this, and home audio and sound reproduction functions are provided. The present invention can be similarly applied to other types of sound-related products such as a personal computer and a portable information terminal with a sound reproduction function.
[0021]
【The invention's effect】
According to the present invention, it is possible to create a plurality of music signals having a sense of spread and depth from one music signal.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a configuration of a ringtone melody sound reproduction system of a mobile phone according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of an installation location of an external speaker mounted on a mobile phone.
FIG. 3 is an explanatory diagram of an installation location of an external speaker mounted on a mobile phone according to a modification of the present invention.
4 is a configuration diagram showing a configuration of a ringing melody sound reproduction system of a mobile phone according to a modified example of FIG. 1;
5 is a configuration diagram showing a configuration of a sound field adjusting circuit according to another modification of FIG. 1. FIG.
6 is a configuration diagram showing a configuration of a reverberation component adding unit in FIG. 5. FIG.
FIG. 7 is a configuration diagram showing a configuration of a ringtone melody sound reproduction system of a conventional mobile phone.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Memory 3 Controller 4, 4A Sound field adjustment circuit 4a System division | segmentation means 4b Time axis adjustment means 4c Volume balance adjustment means 4d Pitch conversion means 4e Reverberation component addition means 11, 12, 91 Delay part 21, 22, 92 Multiplication part 31, 32 Pitch converter 40 System converter 41, 42, 90 Adder 50, 50A D / A converter 51, 52, 53 D / A converter 61, 62, 63 Power amplifier 71 L channel speaker 72 R channel speaker 73 C (Center) Channel speakers 80, 81, 82 Reverberation component adding section

Claims (6)

A system dividing means for system-dividing one music signal to create first, second and third system music signals;
Of the three music signals, pitch conversion means for raising (lowering) the pitch of the second music signal and lowering (higher) the pitch of the third music signal;
Time axis adjusting means for adjusting the time axis so that the first system music signal is relatively ahead of the second system music signal and the third system music signal on the time axis;
First addition means for adding the second system music signal and the first system music signal after converting the pitch by the pitch conversion means and adjusting the time axis by the time axis adjustment means;
Second addition means for adding the third system music signal and the first system music signal after converting the pitch by the pitch conversion means and adjusting the time axis by the time axis adjustment means;
A sound field adjusting device comprising: The time axis adjustment means adjusts the time axis so that the second system music signal precedes the third system music signal relatively on the time axis,
The sound field adjusting device according to claim 1. The pitch converting means raises (lowers) the pitch of the second system music signal and lowers (higher) the pitch of the third system music signal within a range of 1/20 to 1/10 of a semitone. What
Sound field adjustment device according to claim 1 or 2 Symbol mounting characterized. Providing a volume balance adjusting means for adjusting a volume balance among the first system music signal, the second system music signal, and the third system music signal;
Sound field adjustment device according to claim 1 or 2 or 3 Symbol mounting characterized. Reverberation component adding means for adding reverberation components to at least the second system music signal and the third system music signal among the first system music signal, the second system music signal, and the third system music signal,
Sound field adjustment device according to claim 1 or 2 or 3 or 4 Symbol mounting characterized. Reverberation component adding means for adding a reverberation component to the music signal of the one system in the previous stage of the system dividing means;
Sound field adjustment device according to claim 1 or 2 or 3 or 4 Symbol mounting characterized.

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