JP2003216154A - Acoustic field adjusting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To create a plurality of systems of musical signals with feelings of expansion and depth from one system of musical signal. <P>SOLUTION: One system of an incoming melody musical signal stored in a memory 1 is inputted in an acoustic field adjusting circuit 4, is divided into three systems, first, second and third musical signals by a system separation means 4a, the second musical signal is delayed from the first musical signal by 150 ms and the third musical signal is delayed from the first musical signal by 300 ms by a time axis adjusting means 4b. Then, a pitch of the second musical signal is made higher by about one tenth of a semitone and a pitch of the third musical signal is made lower by about one tenth of a semitone by a pitch conversion means 4d after adjusting sound volume balance among the respective systems by a sound volume balance adjusting means 4c. Then, the first musical signal is added to the second musical signal, acoustically reproduced from an L channel loudspeaker 71, the first musical signal is added to the third musical signal and acoustically reproduced from an R channel loudspeaker 72. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound field adjusting device, and more particularly to a sound field adjusting device for producing two or three system music signals having a feeling of expanse and depth from one system music signal.

[0002]

2. Description of the Related Art A mobile telephone has a function of notifying a user of an incoming call by playing an incoming melody sound when an incoming call is received. The user must create a desired incoming melody music signal data by key operation and store it in a memory. You can also FIG. 7 shows a block diagram of a conventional ring tone melody reproduction system of a 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 for conversion into an analog incoming melody music signal. The analog incoming melody music signal is amplified by the power amplifier 6 and then acoustically reproduced by the speaker 7.

[0003]

However, in the above-mentioned conventional ring tone melody reproduction system of a mobile phone, since there is only one speaker 7, only a monaural ring tone melody music signal can be sent, and the feeling of expansiveness and depth. I couldn't express my feelings. Moreover, even if a plurality of speakers 7 are installed, it is difficult for the user to express a feeling of expanse and a feeling of depth because the user can create a monophonic incoming melody music signal data by key operation. The present invention has been made in view of the above problems of the prior art, and it is an object of the present invention to provide a sound field adjusting apparatus capable of creating a plurality of systems of music signals having a feeling of expanse and depth from one system of music signals.

[0004]

According to claim 1 of the present invention,
A system dividing means for systematically dividing one system music signal into first, second, and third system music signals, and of the three system music signals, the second system music signal has a higher pitch (lower pitch). , The pitch conversion means for lowering (increasing) the pitch of the third system music signal and the time for the first system music signal to relatively precede the second system music signal and the third system music signal on the time axis. And a time axis adjusting means for adjusting the axis. According to a second aspect of the present invention, the time axis adjusting means adjusts the time axis so that the second system music signal relatively precedes the third system music signal on the time axis. According to a third aspect of the present invention, first adding means for converting the pitch by the pitch converting means and adding the second system music signal and the first system music signal after the time axis is adjusted by the time axis adjusting means,
It is characterized in that it is provided with second adding means for converting the pitch by the pitch converting means and adding the third system music signal and the first system music signal after the time axis is adjusted by the time axis adjusting means. In the present invention, the pitch converting means increases the pitch of the second system music signal (lower) and lowers the pitch of the third system music signal (in the range of 1/20 to 1/10 of a semitone). It is characterized by the fact that the In claim 5, the first system music signal, the second system music signal, the third system music signal
A volume balance adjusting means for adjusting the volume balance between system music signals is provided. Claim 6
Then, a reverberation component adding means for adding a reverberation component 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. Is characterized by. A seventh aspect of the present invention is characterized in that a reverberation component adding means for adding a reverberation component to the one-system music signal is provided before the system dividing means.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Next, one embodiment of the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram showing a configuration of an incoming melody sound reproduction system of a mobile phone according to the present invention.
Reference numeral 1 denotes a memory that stores a monophonic digital incoming melody music signal. The digital incoming melody music signal may be created by a user from a cell phone, or may be externally obtained by communication. It may be. 2 is an incoming call detection circuit that detects an incoming call,
Reference numeral 3 denotes a controller having a microcomputer configuration. When an incoming call is detected by the incoming call detection circuit 2, a digital incoming call melody music signal is read out from the memory 1 and output to a sound field adjustment circuit described later for sound field adjustment processing in the digital area. Is executed to output the first to third digital music signals of the three systems. Reference numeral 4 is a sound field adjusting circuit composed of a DSP (digital signal processor), of which 4a is a system division for systematically dividing one system music signal into three systems first, second and third digital music signals. Means 4b is a time axis adjusting means for adjusting the time axis among the first, second and third digital music signals so that the first digital music signal is on the time axis more than the second and third digital music signals. In order to relatively precede (in addition, the second digital music signal may relatively precede the third digital music signal on the time axis). Reference numeral 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 of the first, second and third digital music signals of the three systems. It is a pitch converting means for converting the pitch between the signal and the third digital music signal.

The system dividing means 4a divides the input digital incoming melody music signal into three parts to divide them into first, second and third parts.
Output as a digital music signal. Time axis adjusting means 4
b, the delay unit 11 delays the second digital music signal by a delay time τ1 and outputs it, and the delay unit 12 delays the third digital music signal by a delay time τ2 and outputs it. The volume balance adjusting means 4c has a multiplication unit 21 for varying the level of the second digital music signal and a multiplication unit 22 for varying the level of the third digital music signal.
In step 2, the second digital music signal and the third digital music signal are respectively multiplied by multiplication coefficients a and b of 1 or less to adjust the volume balance. 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 in the pitch conversion unit 31, and changes the pitch of the third digital music signal in the pitch conversion unit 32. Change only P2. For P1 and P2, a value is set such that when one of the pitches is high, the other is low. P
1, P2 is preferably 1/20 to 1/10 of a semitone
It is better to set within the range. 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.

Reference numeral 40 is a system conversion circuit for converting three-system music signals into two-system music signals, of which 41 is a first system.
An adder for adding the digital music signal and the second digital music signal to create an L channel digital music signal,
An adder 42 adds the first digital music signal and the third digital music signal to create an R channel digital music signal. Reference numeral 50 is a D / A conversion circuit for converting a digital music signal into an analog music signal.
Reference numeral 1 is a D / A converter for D / A converting an L channel digital music signal to create an L channel analog music signal, and 52 is D / A converting an R channel digital music signal to create an R channel analog music signal. D / A
It is a converter. Reference numeral 61 is a power amplifier for amplifying the power of the L channel analog music signal, 62 is a power amplifier for amplifying 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. It is an R channel speaker driven by the output of.

As shown in FIG. 2, the mobile phone has a hinge 83 for opening and closing (rotating) a first housing 81 having a liquid crystal display panel 80 inside and a second housing 82 having various keys inside.
Among them, the L channel speaker 71 is provided as an external speaker on the left and right sides of the rear surface of the first housing 81.
And an R channel speaker 72 are built in.

Next, the operation of the above embodiment will be described. The controller 3 sets parameters in each part of the volume adjusting circuit 4 when the power of the mobile phone is turned on. Specifically, for example, τ1 is 150 ms, τ2 is 300 ms, and a is 0.
6 and b are 0.4 and P1 is a value that is 1/10 of a semitone higher,
P2 is set to a value that is one tenth of a semitone lower (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 adjusting circuit 4. In the sound field adjusting circuit 4, first, the digital incoming melody music signal is divided into three systems by the system dividing means 4a,
First, second, and third digital music signals are created. The first, second, and third digital music signals of these three systems are shifted by 150 ms on the time axis by the time axis adjusting means 4b and output. Then, the volume balance adjusting means 4
With c, 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. Further, the pitch converting means 4d raises the pitch of the second digital music signal by 1/10 of a semitone and lowers the pitch of the third digital music signal by 1/10 of a semitone.

As a result, the first digital music signal is output from OUT1 as it is as the digital incoming melody music signal input from the controller 3, delayed by 150 ms from the first digital music signal, and the level is 0.6 times and the pitch. The second digital music signal whose signal is raised by 1/10 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. Three digital music signals are output from OUT3.

The external speakers installed in the mobile phone are the L channel speaker 71 and the R channel speaker 72.
Therefore, the three-system first, second, and third digital music signals are converted into two systems by the system conversion circuit 40. That is, the first digital music signal and the second digital music signal are added by the adding section 41 to create an L channel digital music signal, and the first digital music signal and the third digital music signal are added.
The digital music signals are added by the adder 42 to create an R channel digital music signal.

The L channel digital music signal is D / A
The D / A converter 51 of the conversion circuit 50 converts the L-channel analog music signal into an L-channel analog music signal, which is power-amplified by a power amplifier 61 and then acoustically reproduced by an 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, power-amplified by the power amplifier 62, and then acoustically reproduced by the R-channel speaker 72. As a result, the sound output from the L channel speaker 71 and the R
In the sound output from the channel speaker 72, in addition to the original incoming melody music signal stored in the memory 1, a component deviated from the original incoming melody music signal in the time axis direction and having a pitch shift (on the L channel side, The second music signal component, and the R channel side also contains the third music signal component), so reverberation and chorus (detune)
Can be demonstrated. In addition, the sound output from the L channel speaker 71 and the sound output from the R channel speaker 72 have different amounts of deviation in the time axis direction of the component added to the original incoming melody music signal, and the pitch is changed. Since the directions taken are also different, a feeling of separation between the L channel and the R channel occurs. Therefore, a feeling of expanse and depth is created in the incoming melody sound.

In the above example, τ1 is 150 ms,
τ2 was set to 300 ms, but this is an example and 0
<Τ1 ≦ 500 ms, 0 <τ2 ≦ 500 ms,
τ1 = τ2 = 250 ms, τ1 = 250 ms,
τ2 = 500 ms, τ1 = 300 ms, τ2 =
150ms or τ1 = 500ms, τ2 = 250
It may be set to another value such as ms. Preferably, τ1 and τ2 are set within the range of 0 <τ1 ≦ 250 ms and 0 <τ2 ≦ 500 ms, or 0 <τ1 ≦ 5.
Τ1, τ2 within the range of 00ms, 0 <τ2 ≦ 250ms
Set to. Further, although a = 0.6 and b = 0.4 are set, other values may be set. For example, when τ1 <τ2 is set, a = 0 in the range of 1>a>b> 0. .7,
b = 0.3 may be set, or a = 0.8 and b = 0.2 may be set. On the contrary, when setting τ1> τ2,
Within the range of 1>b>a> 0, a = 0.4 and b = 0.6 are set, a = 0.3 and b = 0.7 are set, and a =
You may set to 0.2 and b = 0.8. Also, τ
When 1 = τ2 is set, a = b = 0.5 or a = 0.6, b in the range of 1>a> 0, 1>b> 0.
= 0.4, or a = 0.4 and b = 0.6. Further, although P1 is set to a value that is 1/10 of a semitone higher and P2 is set to a value that is 1/10 of a semitone lower, P1 is a value that is 1 / 20th of a semitone higher, and P2 is 1/20 of a semitone. A value that lowers the value, or conversely, a value that lowers P1 by 1 / 10th of a semitone, a value that P2 increases by 1 / 10th of a semitone, or a value that lowers P1 by 1 / 20th of a semitone , P2 may be set to a value that is 1/20 higher than a semitone. Furthermore, set P1 to a value that is 1/10 of a semitone higher, and set P2 to a value that is 1/20 of a semitone lower,
P1 is a value that is 1/20 of a semitone higher, P2 is 10 of a semitone
Set P1 to a value that is 1/10 lower than a semitone, P2 to a value that is 1 / 20th a semitone higher, or P1 is a 1 / 20th a semitone. It may be set to a lower value or P2 to a value that is 1/10 of a semitone higher. In short, when P1 is set to a high (low) pitch value, P2 is set to a low (high) pitch value, and the amount of change from the original pitch is 1 semitone.
It is preferably about 1/0 to 1/20.

According to the above-described embodiment, the original one-system incoming melody music signal stored in the memory 1 is inputted to the sound field adjusting circuit 4, and the system dividing means 4a makes the first,
The system is divided into three systems of the second and third music signals, and the time axis adjusting means 4b causes the first music signal to relatively precede the second and third music signals on the time axis (combined: (2 music signals may precede the 3rd music signals relatively on the time axis), after adjusting the volume balance between each system by the volume balance adjusting means 4c, and further by the pitch converting means 4d. The pitch is made higher (lower) and the pitch of the third music signal is made lower (higher). Then, the first music signal and the second music signal are added and acoustically reproduced as the L channel music signal from the L channel speaker 71, and the first music signal and the third music signal are added and the R channel speaker is used as the R channel music signal. Since sound is reproduced from 72, sound output from the L channel speaker 71 and R
The sound output from the channel speaker 72 includes the original incoming melody music signal and a component that is deviated from the incoming melody music signal in the time axis direction and is also deviated in pitch. In addition, the sound output from the L-channel speaker 71 and the sound output from the R-channel speaker 72 can exhibit the tune), and the pitch change direction (or time) of the component added to the original incoming melody music signal. Since both the axial shift amount and the pitch change direction are different, a feeling of separation between the L channel and the R channel occurs. Therefore, a feeling of expanse and depth is created in the incoming melody sound.

In the above-described embodiment, the system conversion circuit 40 provided separately from the sound field adjustment circuit 4 is used to perform conversion from three systems to two systems. Therefore, system conversion means may be provided after the pitch conversion means 4d, or the D / A conversion circuit 5 may be used.
A system conversion circuit having an analog circuit configuration may be provided after 0.

The external speakers mounted on the mobile phone are the L channel speaker 71 and the R channel speaker 7.
Therefore, the three system first, second, and third music signals output from the sound field adjusting circuit 4 are converted into two systems by the system conversion circuit 40. When a speaker is mounted, each external speaker may be driven by each of the first, second, and third music signals output from the sound field adjusting circuit 4 without system conversion.

Specifically, as shown in FIG. 3, the mobile phone has an L channel speaker 71 and an R channel speaker 72.
In addition to the above, when a C (center) channel speaker 73 is also installed, the system conversion circuit 40 is omitted by changing FIG. 1 as shown in FIG. 4, and the D / A conversion circuit 50A is replaced by a D / A converter.
A converter 53 is added, and a power amplifier 63 that power-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 adjusting circuit 4 is input to the D / A converter 53 to be converted into a C channel analog music signal, and after power amplification by the power amplifier 63, a C channel speaker 73. Drive. In addition, the second digital music signal output from OUT2 of the sound field adjusting circuit 4 is input to the D / A converter 51 to be converted into an L channel analog music signal, and after power amplification by the power amplifier 61, the L channel speaker 71. Drive the sound field adjustment circuit 4 O
D / A the third digital music signal output from UT3
It is input to the converter 52 and converted into an R channel analog music signal, and after power amplification by the power amplifier 62, the R channel speaker 72 is driven.

Also in the examples of FIGS. 3 and 4, 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 in time axis. As the sound is shifted in the direction and the pitch is also shifted, the reverberation and chorus feeling (detune) can be exhibited.
In the sound output from the channel speaker 71 and the sound output from the R channel speaker 72, the pitch change direction (or the shift amount in the time axis direction and the pitch change direction) is higher than that of the sound output from the C channel speaker 73. Both are different), so that a feeling of separation between the L channel and the R channel occurs. Therefore, a feeling of expanse and depth is created in the incoming melody sound.

Further, as shown in FIG. 5, the sound field adjusting circuit 4A
For example, the reverberation component adding means 4e may be provided after the pitch converting means 4d to add the reverberation component to each of the first to third digital music signals. Specifically, each of the first to third digital music signals is passed through reverberation component adding sections 80, 81 and 82 to add the reverberation component. The reverberation component adding section 80 is, for example, as shown in FIG. 6, an adding section 90 for adding the output of the multiplying section described later to the first digital music signal,
The output of the adder 90 is output for a short time τ (τ is, for example, 5 ms, 1
A delay unit 91 for delaying only by 0 ms) and outputting to the outside
It can be configured by a multiplication unit 92 that multiplies the output of the delay unit 91 by a multiplication coefficient c smaller than 1 and outputs the product to the addition unit 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, by adding the reverberation component adding means 4e, the reverberation can be further enhanced. It should be noted that the reverberation component adding means 4e may be provided not in the latter stage of the pitch converting means 4d but in the former stage side, or may be provided in the former stage of the volume balance adjusting means 4c. Alternatively, instead of the reverberation component adding unit 4e, one reverberation component adding unit similar to the reverberation component adding unit 80 shown in FIG. 6 may be provided on the input side of the sound field adjusting circuit 4 (before the system dividing unit 4a). May be.

Further, in the above-mentioned embodiments and modified examples, the reproduction system of the incoming melody sound of the mobile phone has been described as an example, but the present invention is not limited to this.
It can be similarly applied to other types of audio-related products such as home audio, personal computers with audio playback functions, and portable information terminals with audio playback functions.

[0021]

According to the present invention, it is possible to create a plurality of systems of music signals having a feeling of spaciousness and depth from one system of music signals.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration of an incoming 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 place of an external speaker mounted on a mobile phone according to a modified example of the present invention.

FIG. 4 is a configuration diagram showing a configuration of an incoming melody sound reproduction system of a mobile phone according to a modification of FIG.

5 is a configuration diagram showing a configuration of a sound field adjusting circuit according to another modification of FIG.

6 is a configuration diagram showing a configuration of a reverberation component adding unit in FIG.

FIG. 7 is a configuration diagram showing a configuration of a conventional melody sound reproduction system of a mobile phone.

[Explanation of symbols]

1 memory 3 controller 4, 4A sound field adjusting circuit 4a system dividing means 4b time axis adjusting means 4c volume balance adjusting means 4d pitch converting means 4e reverberation component adding means 11, 12, 91 delay section 21, 22, 92
Multipliers 31, 32 Pitch converter 40 System converters 41, 42, 90 Adder 50, 50 AD
/ A conversion circuits 51, 52, 53 D / A converters 61, 62, 63
Power amplifier 71 L channel speaker 72 R channel speaker 73 C (center) channel speaker 80, 81, 82 Reverberation component addition unit

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5D062 AA12                 5D108 AA01 AB04 AC02 AD05                 5D378 JB04 JC09 MM96                 5K027 AA11 FF03 FF25

Claims (7)

[Claims] 1. A system in which one system of music signal is divided into a first system,
System dividing means for creating the second and third system music signals, and of the three system music signals, the second system music signal has a high pitch (low) and the third system music signal has a low pitch (high). And a time axis adjusting means for adjusting the time axis so that the first system music signal relatively precedes the second system music signal and the third system music signal on the time axis. Sound field adjustment device characterized by. 2. The time axis adjusting means adjusts the time axis so that the second system music signal relatively precedes the third system music signal on the time axis. The sound field adjustment device described. 3. The second system music signal and the first music signal after the pitch is converted by the pitch converting means and the time axis is adjusted by the time axis adjusting means.
First adding means for adding the system music signals, and second adding means for adding the third system music signal and the first system music signal after the pitch is converted by the pitch converting means and the time axis is adjusted by the time axis adjusting means. The sound field adjusting device according to claim 1 or 2, further comprising: 4. The pitch converting means raises (lowers) the pitch of the second system music signal and lowers the pitch of the third system music signal (in a range of 1/20 to 1/10 of a semitone). The sound field adjusting device according to claim 1, 2 or 3, wherein 5. A first-system music signal, a second-system music signal,
5. The sound field adjusting device according to claim 1, further comprising volume balance adjusting means for adjusting a volume balance between the third system music signals. 6. A first system music signal, a second system music signal,
Of the third system music signals, at least the second system music signal,
6. The sound field adjusting apparatus according to claim 1, further comprising reverberation component adding means for adding a reverberation component to the third system music signal. 7. The sound according to claim 1, further comprising reverberation component adding means for adding a reverberation component to the music signal of one system before the system dividing means. Field adjustment device.