JP2000059880A - Karaoke (orchestration without lyrics) device integrated with speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the KARAOKE device integrated with a speaker by which an acoustic effect is easily obtained for a singer to feel a stereophonic sense over a wide range. SOLUTION: The KARAOKE device integrated with the speaker is provided with a speaker direction detection section 176 that supplies a stereo signal from a music generating section 163 to speakers 102, 103 close to each other via an SD network 190, allows a singer microphone 320 to generate a high frequency signal, detects the direction of the position of two high frequency microphones 114, 115 by receiving the signal with the microphones, and instructs a control direction of a squawker 102 and a tweeter 103 that are built in the device for two left/right channels and placed close to each other, a speaker drive control section 177 and a drive motor 150 that turn the direction of the speakers 102, 103 according to a control signal from the speaker direction detection section 176.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker-integrated karaoke apparatus having a built-in speaker.

[0002]

2. Description of the Related Art In a conventional karaoke apparatus with a built-in speaker (hereinafter, referred to as a karaoke apparatus with a built-in speaker), a plurality of speakers are integrally formed with the apparatus, so that a generated sound has a three-dimensional effect. Some have tried to add sound effects. FIG. 15 is an external view showing an example of such a conventional speaker-integrated karaoke apparatus. In the karaoke apparatus 200 with integrated speakers shown in this figure, an operation panel 201 in which various operation switches are arranged on the front of the apparatus,
Two middle and high frequency speakers 202 and 203 and a low frequency speaker 204 are arranged. Medium and high frequency speakers 202 and 20
Numeral 3 is driven by right and left channel drive signals output from independent amplifiers, and is configured to generate a stereophonic sound in a mid-high range.

According to the above-described conventional speaker-integrated karaoke apparatus, a certain stereoscopic effect can be obtained by a stereo effect of a plurality of speakers. However, in the speaker-integrated karaoke apparatus, since a plurality of speakers are built in the apparatus, the interval between the speakers cannot be made larger than the size of the apparatus. For this reason,
The range 205 of the sense of spaciousness by the stereo becomes narrow. In other words, the singer listened to a simple karaoke accompaniment sound without spreading, that is, a karaoke accompaniment sound that is not much different from monaural. In addition, when the singer moves from place to place, the position of the loudspeaker is fixed in the above-described device, and in that case, a desirable sound effect cannot be expected.

[0004]

As described above, in the conventional karaoke apparatus with a built-in speaker, the singer listened to a simple sound without spreading. Also, because of the one-piece design, a sufficient stereo feeling could not be achieved without special measures. Further, even when the singer moves from place to place, the speaker position is fixed, so that a sufficient sound effect cannot be expected.

The present invention provides a karaoke apparatus with a built-in speaker, in which a singer can easily obtain a sound effect in which a singer can feel a three-dimensional effect in a wider range than in the past. The purpose is to do. It is another object of the present invention to provide a speaker-integrated karaoke apparatus that can obtain a sufficient sound effect even when a singer moves.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 provides an audio signal input means for inputting an audio signal using a microphone, and an audio signal for karaoke accompaniment. Sound signal generating means, a speaker,
A speaker direction rotating means for rotating the direction of the speaker, and a sound signal generated by the speaker based on a sound signal input by the sound signal input means and a sound signal generated by the sound signal generating means. Speaker drive signal generating means for generating a speaker drive signal;
A microphone position detecting unit that detects the position of the microphone by wireless detection; and a speaker direction control unit that drives the speaker direction rotating unit according to the microphone position detected by the microphone position detecting unit. And

According to a second aspect of the present invention, the loudspeaker has at least two loudspeaker units which are close to each other, and the loudspeaker rotating means changes the direction of the at least two loudspeaker units. Sound image localization processing means for performing predetermined sound image localization processing on the sound signal generated by the sound signal generation means to generate sound image localization sound signals for left and right two channels; and the sound image localization processing. When the sound based on the sound image localization sound signal of each channel output from the means is emitted from the plurality of speaker units, each of the sounds emitted from each speaker unit is used as an audio signal using the microphone without crosstalk. A crosstalk key that performs arithmetic processing on each sound image localization sound signal so that it reaches the left and right ears of the singer who inputs the sound It is characterized by comprising a Nseru means. According to a third aspect of the present invention, the speaker drive signal generating means performs a delay process on each speaker drive signal for driving the plurality of speaker units according to a control direction of the direction of each speaker unit. It is characterized by:

In each of the above means, for example, the sound image localization processing means converts a stereo signal such as a karaoke song generated by the acoustic signal generation means from a virtual sound source (speaker) assumed to be at a desired localization position. It can be configured using a digital filter using a transfer function (head-related transfer function: HRTF) reaching the left and right ears of the singer (listener) as a coefficient. The crosstalk canceling means is configured such that, when sound is generated from at least two speaker units actually incorporated in the present apparatus, each of the sounds generated from each speaker unit does not cause spatial crosstalk, and And a digital filter that performs arithmetic processing on the two-channel sound image localization sound signals corresponding to the left and right ears output from the sound image localization processing means so as to reach the left and right ears.

When processing using a head-related transfer function is performed in the above-described apparatus, a speaker composed of two speaker units that are close to each other is placed on the head of a singer who meets the conditions of the head-related transfer function. It is possible to obtain an optimal sound effect when the device is arranged facing. Further, in a karaoke apparatus with a built-in speaker, an operation panel is generally arranged at the upper part and a speaker is arranged at the lower part. At the same time,
When the singer changes the location, it is desirable to control the loudspeaker to point to the destination of the singer using a means for detecting the moving position. When individually controlling each radiation axis direction of a plurality of proximity speaker units, the speaker direction control means detects the position of a karaoke singing microphone by radio waves such as ultrasonic waves and infrared rays, and detects the detected position, that is, It is desirable to control so that both axes of each speaker unit substantially intersect at the singer's microphone position.

According to the above configuration, by controlling the direction of the speaker, a sufficient acoustic effect can be expected in sound image localization control when a virtual sound source is used.
It is possible to provide a speaker-integrated karaoke apparatus having a high three-dimensional sound effect that can expand a sound image.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a view showing an appearance of an embodiment of an integrated karaoke apparatus according to the present invention. The speaker-integrated karaoke apparatus 100 shown in FIG.
An operation panel 101 arranged on the front of the apparatus, and two middle and high frequency speakers 102 and 1 arranged close to each other symmetrically with respect to the center on the same surface as the operation panel 101.
03, a display 113 having a display surface facing the same surface as the operation panel 101, two high-frequency microphones 114 facing the same surface as the middle and high frequency speakers 102 and 103, and symmetrically arranged with respect to the center; 115, each having a built-in or integrally formed upper housing 111,
And a lower housing 110 containing a single bass speaker 104. The lower housing 110 is fixed or semi-fixed, and the upper housing 111 is attached to the lower housing 110 so as to rotate in the direction of arrow 120 with respect to the lower housing 110 by a driving mechanism provided inside. I have.

A karaoke apparatus with a built-in speaker according to the present embodiment.
In the case of 100, middle and high frequency speakers 102, 10
3 are arranged in the upper housing 111 in close proximity to each other.
The sound output from 2, 103 is the singer
When they are located almost in front of 102 and 103, they will be perceived as sounds output from the speakers located at the right (R) virtual speaker position 116 and the left (L) virtual speaker position 117, respectively. Therefore, the range between the spreads felt by the singer is wider than the actual speaker interval, as indicated by the dashed line 105.

FIG. 2 is a view for explaining the basic structure of the rotating mechanism inside the speaker-integrated karaoke apparatus 100 shown in FIG. 1, and the mounting and tilting state of the middle and high range speakers 102 and 103. 2, the same components as those in FIG. 1 are denoted by the same reference numerals. A gear 151 driven by a rotary drive motor 150 and a plurality of bearings (rolling mechanisms) 152, 152,... Are provided on the bottom surface of the upper housing 111. It is attached to the groove. That is, the upper housing 111
Is mounted coaxially and rotatably with respect to the lower housing 110.

On the other hand, the inclination of the middle and high frequency speakers 102 and 103 is set so as to have an inclination angle with respect to the vertical axis of the housing 111 so that the axis of each speaker faces the head of the singer 300. It has become. For example, when the ground height of the middle and high range speakers 102 and 103 is set to about 1 m, the inclination angle can be set to about 15 to 30 °.

Next, the internal circuit of the karaoke apparatus 100 with integrated speakers shown in FIGS. 1 and 2 will be described with reference to FIG. FIG. 3 is a block diagram showing an internal circuit of the speaker-integrated karaoke apparatus 100, and the same components as those shown in FIGS. In FIG. 3, a remote control for remotely controlling music selection, volume, pitch, etc.
310 and the singer's microphone 320, the lower and upper housings 110, 1
It is a separate structure from 11. In this embodiment, the remote control 310 and the singer's microphone 320 are provided with high-frequency generators 311 and 321, respectively, and intermittently turn on and off sound signals of non-audible frequencies (so-called ultrasonic waves). It has become. Normally, one of the high-frequency generator 311 of the remote controller 310 and the high-frequency generator 321 of the singer's microphone 320 is configured to selectively operate.

The operation of various operators provided on the remote controller 310 is input to a panel control unit 161 which receives the operation of the operators of the operation panel 101 by an infrared signal. The panel control unit 161 includes a CPU (central processing unit), a memory, and the like, and operates the remote controller 310 or the operation panel 101.
Echo reverb generator in response to direct operation of the above controls
162, the music generation unit 163, and the SD network unit 190.

The echo reverb generation unit 162 is connected to the microphone amplifier 1 in accordance with a control signal supplied from the panel control unit 161.
The reverberation and reverberation effects are added to the input signal from 64 and output. A singer's microphone 320 is connected to the microphone amplifier 164, and the microphone amplifier 164 amplifies and outputs an audio signal emitted by the singer. The audio signal output from the echo reverb generator 162 is input to the mixer 166 and the mixers 172 and 173 via the audio volume 165. The audio volume 165 is a volume for adjusting the volume of the audio signal.
Control is performed according to a control signal (not shown) supplied from the panel control unit 161 in response to the operation of the above operation element.

The mixer 166 mixes the output signal of the echo reverb generator 162 input via the audio volume 165 and the output signal of the mixer 170, and mixes the output signal of the mixer 170 with a low-pass filter 167.
Output to The low-pass filter 167 transmits only a signal having a frequency equal to or lower than a predetermined frequency set to about several hundred Hz without attenuating the input signal and outputs the signal.
The signal is supplied to the power amplifier 169 via the line 8. The master volume 168 includes an input signal of a power amplifier 169 that amplifies a drive signal of the bass speaker 104,
The stereo power amplifier 174 amplifies each of the 103 drive signals. The stereo power amplifier 174 is composed of three volumes that operate in conjunction with the three input signals. Therefore, by adjusting the master volume 168, the volume of the sound signals output from all the speakers can be adjusted at the same rate. Similarly to the audio volume 165, the master volume 168 also controls the panel control unit 1 according to the operation of the operator of the remote controller 310 and the operation of the operator on the operation panel 101.
It is controlled according to a control signal (not shown) supplied from 61.

The music generating section 163 includes a laser disk player, a video CD (compact disk) player, and a DVD.
(Digital video disk) One or more playback devices for playing back background images and music signals recorded on recording media such as players and hard disks, and data related to music such as MIDI data from an external device via a communication line. Is provided if necessary. Then, according to the control signal supplied from the panel control unit 161, the music generation unit 163 outputs a video and a two-channel stereo music signal (audio signal) corresponding to the music selected in accordance with the operation of the remote control 310 and the operation panel 101. ) Is output. The video output from the song generator 163 is the display 1
13 and the stereo music signal is supplied to the SD network 190
And the mixer 170 that mixes the signals of the respective channels with each other.

The SD network 190 performs predetermined sound image localization processing on the input music signal, and outputs sounds based on the music signal of each channel on which the sound image localization processing has been performed, from the middle and high frequency speakers 102 and 103. In this case, a calculation process is performed so that each of the sounds output from the speakers reaches the left and right ears of the singer without generating crosstalk. In particular, the SD network 190 is characterized in that the area where the virtual speaker effect can be obtained is enlarged by making the intervals between the speakers close to each other. Here, SD is an abbreviation for Stereo Dipole. Hereinafter, the SD network 190 will be described in detail with reference to FIGS.

FIG. 4 is a schematic diagram showing the relationship between the actual speaker and the virtual speaker and the listening position, and FIG. 5 is a block diagram showing arithmetic processing executed in the SD network 190. 4 and 5, the same components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals. In the SD network 190, first, processing for localizing input signals of two channels on the left and right to desired virtual speaker positions 116 and 117 is performed by the sound image localization network 191. As shown in FIG. 4, the right virtual speaker position
The transfer functions from 116 (R ′) to the right ear γ and the left ear 1 of the singer 300 are represented by hR′γ and hR′l, and the left virtual speaker position 117.
Assuming that transfer functions from (L ′) to the right ear γ and the left ear 1 of the singer 300 are hL′γ and hL′l, the right input (R) and the left input (L) supplied from the music generation unit 163. As shown in FIG. 5, each of transfer functions hR′γ from the positions (R ′) and (L ′) of the right and left virtual speakers to both ears,
hR′l, hL′γ, and hL′l are subjected to convolution operation, and the signals corresponding to the respective ears obtained as the operation results are respectively added. The signals Sγ and Sl expected to reach the ear are obtained. The transfer functions hR′γ, hR′l, hL′γ, hL′l are head transfer functions (HR) from the virtual speaker to the listener's head.
TF).

As shown in FIG. 5, the sound image localization network 191 includes transfer functions hR 'obtained by experiments or calculations.
FIR (finite impulse response) digital filters 191d, 191c, 191b, 191a in which the impulse response due to γ, hR′l, hL′γ, hL′l are set as coefficients, an adder 191f,
191e. In this case, the right channel input signal (R) is input to digital filters 191d and 191c, the left channel input signal (L) is input to digital filters 191a and 191b, and the outputs of digital filters 191a and 191c are added by adder 191e. And the adder 191f
Thus, the outputs of the digital filters 191d and 191b are added. Then, when each speaker exists at the virtual position, the signal Sγ to be reached to the right ear γ of the listener is obtained from the adder 191f.
Then, a signal Sl to reach the left ear 1 is supplied from the adder 191e.
Each is output.

The singer 300 receives the sound signals Sγ and Sl
Can be obtained by the virtual loudspeaker when the sounds corresponding to are heard by only the right and left ears independently. However, in practice, as shown in FIG.
The sound output from the right middle treble speaker 102 reaches the right ear and also reaches the left ear. Similarly, the sound output from the left middle treble speaker 103 reaches the left ear and also reaches the right ear. in this way,
Originally, in order to obtain a sound image localization effect, sound that must be heard by only one of the left and right ears is actually heard by the other ear. This phenomenon is generally called spatial crosstalk.

Therefore, the SD network 190 is provided with a singing voice after the sound image localization network 191 from the right middle treble speaker 102 to the left ear 1 of the singer 300 and the left middle treble speaker 103 as shown by a dashed line in FIG. A crosstalk canceling network 192 is provided for removing spatial crosstalk to the right ear γ of the person 300. In the present embodiment, the crosstalk cancellation network 192 includes an adder 191f.
From the right middle treble speaker 102 to the right ear γ
Digital filters 192d and 192c having an inverse filter characteristic of a transfer function to the left ear 1 and the left ear l, and an inverse filter of a transfer function to the left ear 1 and the right ear γ from the left / middle loudspeaker 103 with the output of the adder 191e as an input. Digital filters 192a and 192b having characteristics; a subtractor 192f for subtracting the output of the digital filter 192b from the output of the digital filter 192d for output; and a subtraction for subtracting and outputting the output of the digital filter 192c from the output of the digital filter 192a. vessel
192f. According to this configuration, the subtractor
By outputting a sound signal corresponding to the output of 192f from the right middle treble speaker 102 and outputting a sound signal corresponding to the output of the subtractor 192e from the left middle treble speaker 103, crosstalk is eliminated, The sound obtained by giving the sound image localization effect to the input signal by the processing by the localization network 191 can be heard using an actual speaker.

Referring again to FIG. 3, the SD network 19
The music signals corresponding to the left and right middle and high frequency speakers 102 and 103 output from 0 are the music volume 171 and the mixer 1 respectively.
The signals are supplied to a stereo power amplifier 174 via 72 and 173 and a master volume 168. Here, like the master volume 168, the music volume 171 is composed of two volumes that adjust the volume of each channel in conjunction with each other.
Mixers 172 and 173 mix the audio signal output from audio volume 165 in common with the music signal of each channel.

By the way, the provision of the sound image localization effect on the sound signal by the SD network 190 is realized by an arithmetic process using a transfer function of the sound signal in space. Therefore, the above effects are affected by the position of the listener and the conditions of the reproduced sound field around the apparatus 100. In particular,
The effect of crosstalk cancellation is greatly affected by the direction of each speaker when two close speakers are used as in the present embodiment, and the position of the listener is about 10 ° left and right with respect to the acoustic radiation axis direction of each speaker. It has been confirmed that when the value is within the range, a sufficient effect can be obtained.
Therefore, in the present embodiment, in order to change and control the direction of each speaker, the direction of each speaker can be automatically changed by providing the rotation drive motor 150 and its drive control system.

Next, a drive control system of the rotary drive motor 150 according to the present embodiment will be described. In FIG. 3, a two-channel microphone amplifier 175 includes two high-frequency microphones 114 and 11.
The output signal of No. 5 is amplified and output to the speaker direction detection unit 176. The speaker direction detection unit 176 shapes the AC waveform of each of the right (R) and left (L) channel pickup signals input from the two-channel microphone amplifier 175 into a DC level signal as shown in FIG. 6, for example. Shaping circuits 176a and 176b that output as right and left channel shaping signals, and input and output signals (input from ports P1 and P2) to perform arithmetic processing to specify right or left motor rotation direction. The microcomputer 176c includes a direction designation signal (output from the port P7) and a microcomputer 176c that outputs a motor drive signal for instructing start and stop of the motor (output from the port P8). The L and R direction designation signals and the motor drive signal output from the speaker direction detection unit 176 are supplied to a speaker drive control unit 177. Based on these signals, the speaker drive control unit 177 outputs the motor drive signal to start the motor. The drive control of the rotary drive motor 150 is performed so that the upper housing 111 rotates in the direction designated by the L and R direction designation signals during the designated predetermined level (see FIG. 2).

The operation of the microcomputer 176c will now be described with reference to FIGS. FIG. 7 is a flowchart showing the flow of arithmetic processing by the microcomputer 176c, and FIG. 8 is a timing chart showing the time change of input / output signals of the microcomputer 176c and a plurality of signals related thereto. Here, when a high-frequency generation signal as shown in FIG. 8 is generated from the high-frequency generator 321 of the singing microphone 320 shown in FIG. 3, a time difference Δt is generated between the L-channel microphone pickup signal and the R-channel microphone pickup signal. Suppose when it is detected that it has. In FIG. 8, T1 represents the repetition time interval of the intermittently generated high-frequency generation signal, and t1 represents the high-frequency burst signal time interval.

The microcomputer 176c first detects the speaker direction from the time difference Δt (step S1 in FIG. 7).
00). Here, if the time difference Δt is smaller than the predetermined threshold (the determination result in step S101 is small), the motor returns to the detection again without outputting a motor drive signal (step S102) so as not to rotate the motor (step S102). Step S106). In this example, if it is determined that the time difference Δt is larger than the predetermined threshold (the determination result in step S101 is large), it is next determined whether the left or right signal has a shorter arrival time (step S103). As shown in FIG. 8, when the arrival time of the left channel is short, the microcomputer 176c
The level of the L and R direction designation signals is set to the level corresponding to the left direction ("1" in FIG. 8), and the port P8 (FIG. (See step S104).
Then, the process returns to the detection again (step S106). On the other hand, FIG.
Conversely, when the arrival time of the signal of the right channel is shorter, the level of the L and R direction designation signals is different from the level corresponding to the right direction (“0” in FIG. 8). "), And the motor drive signal is similarly output.

As described above, in the karaoke apparatus with a built-in speaker according to the present embodiment, the left and right karaoke apparatuses 320 corresponding to the high frequency generation signal generated from the high frequency generator 321 of the singing microphone 320 are provided.
By controlling the drive direction and drive time of the motor in such a direction and time that Δt decreases according to the time difference Δt between the L-channel microphone pickup signal and the R-channel microphone pickup signal of the channel, the medium / high pitch speaker 102 And 103 are controlled so as to face the direction of the singing microphone 320, that is, the direction in which the head of the singer is located. When calculating and estimating whether the signal is received from the two high-frequency microphones in accordance with the time difference, whether the vehicle is facing the front or the outside, the components are set so that the time difference becomes zero in the case of the front as described above. With this configuration, when the speaker is not facing the front, the direction of the speaker can be always directed toward the singer by moving or changing the direction of the speaker until the time difference becomes zero. According to this, even when the singer 300 moves, the direction of each speaker is automatically controlled so as to always face the direction of the singer 300, so that the sound effect given by the SD network unit 190 can be sufficiently improved. Can be obtained.

In the above configuration, at the start of the control, for example, first, when the singer goes up to the stage and determines the singing position, the singer's high frequency generator 321 of the microphone 320 or the high frequency generator 311 of the remote control 310 is turned on. Use the device to rotate and set the direction of the speaker. When the singer starts singing and moves, the high-frequency generator 321 of the singer's microphone 320 detects the singer's movement in the speaker direction detector 176 based on the high-frequency signal generated for the high-frequency microphones 114 and 115. Is done. At this time, since the frequency higher than the audible frequency is used for position detection, the influence of the karaoke sound and the influence on the singer can be eliminated. Further, when the singer moves and the singer's position shifts from the front, the direction of the speaker is adjusted again so as to be in front of the singer.

According to the above configuration, the rotation of the display 113 for displaying lyrics and the like is also controlled so that the orientation thereof is the same as that of each speaker. Therefore, the singer can keep the viewing angle with respect to the display within a certain range without being affected by the movement, so that the display is easy to see,
This is advantageous when a display device having a limited viewing angle such as a liquid crystal display is used. In the above-described configuration, changing the radio signal for position detection from a high-frequency signal to an optical signal such as infrared light, or adopting a system using three or more speakers as a system for canceling crosstalk, etc. Can be changed as appropriate.

Next, another embodiment of the present invention will be described with reference to FIGS.
3 will be described. In each drawing, the same components as those of the above-described embodiment described with reference to FIGS. 1 to 8 are denoted by the same reference numerals, and description thereof will be omitted. The difference between the embodiment shown in FIG. 1 and the embodiment shown in FIG. 1 is that the direction of the speaker is changed by rotating the entire upper housing 111 with respect to the lower housing 110 in the embodiment shown in FIG. The point is that only the left and right two-channel mid and high range speakers 102a and 103a are individually rotated. That is, in this embodiment, the housing 100a of the device is not rotated. As shown in FIG. 10, the rotating mechanism of each speaker in this embodiment
The configuration is such that rotary drive motors 401 and 402 are provided corresponding to 2a and 103a, respectively. The direction of each speaker can be independently changed to the direction shown by the arrow in the figure. In this embodiment, since the direction of each speaker is usually changed to the same direction, a configuration in which the number of rotary drive motors is one and a common drive stage is provided for each speaker may be employed. It is possible.

In the present embodiment, by using the above configuration, the scale of the angle adjusting mechanism of each speaker can be significantly reduced as compared with the embodiment shown in FIG. However, the adjustment range of the angle is narrowed. Therefore, according to the present embodiment, it is possible to obtain an improvement effect on the sound effect as obtained in the embodiment of FIG. 1 only in a range where the movement amount of the singer 300 is relatively small. In the present embodiment, since the high-frequency microphones 114 and 115 do not rotate in the same direction as each speaker, the high-frequency microphones 114 and 115 do not rotate.
And 115, the left and right speakers need to be controlled to change their absolute angles (values of angles). That is, in controlling each speaker, not only information on the direction but also information on the absolute position of the singer is required. Originally, it is necessary to provide at least three or more high-frequency microphones, or to provide a means for detecting a singer's position by emitting a radio signal for detection from the karaoke apparatus side and measuring the reflected signal. is there. However, in this embodiment, the angle of each speaker is controlled by the same detection means as in the embodiment of FIG. 1 by approximating that the movement of the singer is all lateral displacement only in horizontal direction (only parallel movement). It is possible. Although it is of course possible to provide a more sophisticated measuring mechanism, practically sufficient effects can be expected from the configuration of the present embodiment also in consideration of the fact that the present apparatus is a karaoke apparatus in which a speaker and a display are integrated.

The middle and high treble speakers 102a and 103a are shown in FIG.
And 103 are provided to provide the same functions. Also in the present embodiment, the middle and high range speakers 102a and 103a are mounted to have a predetermined inclination angle so as to face the head of the singer 300 with respect to the installation vertical direction.

FIG. 11 is a block diagram showing the internal configuration of the embodiment shown in FIG. In the configuration shown in FIG.
The configuration different from the configuration shown in FIG. 3 in addition to the configuration described with reference to FIG. 9 includes a speaker direction detection unit 176a and a speaker control unit 177a (the speaker direction detection unit 176 and the speaker control unit 177).
And a delay circuit 403 that is inserted and added between the outputs of the mixers 172 and 173 and the input of the master volume 168. In the present embodiment, the speaker direction detection unit 176a outputs right and left speaker drive signals indicating the rotation angle values of the middle and high frequency speakers 102a and 103a based on the input signal supplied from the two-channel microphone amplifier 175. At the same time, with respect to the delay circuit 403, each speaker and the singer 300 generated by the rotation of each speaker
And outputs a delay time instruction signal for instructing a delay time for correcting a difference in transmission time from the loudspeaker to the head caused by a difference in each distance between the speaker and the head. Speaker control unit 177a
Are respectively based on the right and left speaker drive signals supplied from the speaker direction detector 176,
And 103a are output so as to drive the rotary drive motors 401 and 402 so that the directions of the directions are directed to the designated angles. Further, the delay circuit 403 performs a delay process on one of the mixer 172 and the audio signal input from the mixer 173 based on the delay time instruction signal supplied from the speaker direction detection unit 176, and outputs the processed signal.

FIG. 1 shows the processing contents of the speaker direction detector 176a.
This will be described with reference to the flowchart shown in FIG. In the detection of the speaker direction in the speaker direction detection unit 176a, first, the input signal similar to that shown in FIGS. Is a table containing a plurality of values obtained in advance by a geometrical calculation assuming that the vertical distance D between each speaker and the head of the singer 300 is constant, as shown in FIG. 13 (b). Is found by searching for (step
S200). If the moving distance ΔT1 obtained as a result of the search is smaller than a predetermined threshold, right and left speaker drive signals for preventing the respective speakers from rotating are output (step S202), and the process returns to the detection (step S205). ). On the other hand, when the moving distance ΔT1 is larger than the predetermined threshold,
Right and left speaker drive signals for specifying the rotation angles of the left and right speakers 102a and 103a are output (step S203), and the singer 3 is rotated by the delay circuit 403.
After instructing the delay time of the delay processing to be performed on the audio signal corresponding to the speaker closer to the head of 00 (step S204), the process returns to detection (step S205).

FIG. 13A shows the middle and high treble speakers 102a and 102 at the initial setting position used when setting the table.
The positional relationship between 3a and the singer 300 is shown. Note that SD
The setting of each value in the network unit 190 is also performed based on this initial setting position. Here, in the initial setting position, each mid-high pitch speaker 1 with respect to the head of the singer 300
The angle θ between 02a and 103a is ± 5 °, and the vertical distance D between the front of each speaker and the center position of the head of the singer 300 is 1.4 m.
The distance W between the speakers is set to 0.254 (m), and the linear distance l1 between each speaker and the center position of the head of the singer 300 is set to 1.421 m. FIG. 13B shows the positional relationship between the middle and high treble speakers 102a and 103a and the singer 300 when the head is shifted rightward by a distance ΔT1 from the initial setting position in FIG. 13A. Side shift of ΔT1 of head position (translation)
If the angle θ ″ with respect to the head is obtained from the center line at the initial position, the angle θ ″ and the moving distance ΔT1
And the vertical distance D are as follows.

[0039]

(Equation 1)

The difference d between the distance between each speaker and the head of the singer is approximately obtained by the following equation.

[0041]

(Equation 2)

At this time, the delay time Dt to be given to the right speaker 102a can be obtained by the following equation, assuming that the sound speed is 340 m / s per second.

[0043]

(Equation 3)

The rotation angles set in the right and left speaker drive signals in step S203 and the delay time of the delay processing set in step S204 are obtained by searching a table including a plurality of data previously calculated from the above relationship. You can ask for it. Table 1 shows that when the above initial setting values are used, the moving distance ΔT1 is set to -10 cm to 10 cm.
cm, the rotation angles of the left and right middle and high-frequency speakers 103a and 102a (L and R), and the designation of the channel (right (R) or left (L)) for which the delay time is to be set; The value of the delay time Dt is shown. Note that the moving distance ΔT1 is positive (+) in the right direction in FIG.
The rotation angle is positive (+) in the clockwise direction with respect to the front axial direction of the speaker.

[0045]

[Table 1]

By performing the control of the direction of each speaker and the delay processing for the output from each speaker as defined in this table, even when the singer's head moves, the initial setting position where there is no movement. It is possible to obtain the same effect of crosstalk cancellation as in the above. For example,
When D = 1.4 m and ΔT = 0.1 m, the angle θ ″ from the center line of the head becomes 4.0856 ° ≒ 4.1 °.
Therefore, the rotation angle of each speaker only needs to be rotated by 4.1 ° in the same direction for both L and R. W =
Assuming 0.245 m, from the equation (2), d = 0.175
m is obtained, and the delay time Dt of the signal is given by Dt from the equation (3).
= 51.3 μsec. When the head moves to the right and left sides, each of them may be considered symmetrical.

The angle between each speaker and the singer,
Initial setting values such as distance are stored in a memory in advance as a plurality of selectable preset values,
It is possible to make it selectable according to the operation of the operation panel 101 or 0. It is also assumed that the head-related transfer function used in the SD network unit 190 is preset with a coefficient based on the preset value of the initial setting value. In the present embodiment, the position of the high-frequency generator 321 and the center position of the head of the singer 300 are simply assumed to be the same in each arithmetic processing.

In the embodiment shown in FIG. 9, a simple approximation method is introduced in detecting the position of the singer. Further, the moving range of each speaker was only an angle change of the direction of the speaker in the axial direction. However, in practicing the present invention, simplification in configuration and function is not necessarily required. For example, adding accurate measurement means for distance in singer position detection to the above configuration, In the movement control of each speaker, it is possible to make a modification such as adding a means for controlling the lateral change. Next, an example of a control method for performing such a modification will be described.

FIG. 14 is a schematic diagram showing an example of the movement of the singer's head position. FIG. 14A shows a case where the distance D between the head and each speaker is larger than the initial position. In this case, in order to maintain the angle θ (for example, ± 5 °) with each speaker at the initial position regardless of the movement of the head, it is necessary to make the interval W between the speakers wider than the initial setting value.

FIG. 14B shows the case where the distance between the head and each speaker is smaller than the initial position. In this case, in order to maintain the angle θ (for example, ± 5 °) with each speaker at the initial position regardless of the movement of the head, the distance W between the speakers is maintained at the initial setting value, and the left and right speakers are left. It is sufficient to rotate each speaker by an angle Φ in the center direction so that the angle θ ′ with the position of the head of the axis line approaches the initially set angle θ.

FIG. 14 (c) shows that the distance between the head and each speaker is smaller than the initial position, and that ΔT
The case where the head has moved by one is shown. In this case, in order to obtain the same angle as the angle θ (for example, ± 5 °) with each speaker at the initial position regardless of the movement of the head, the distance W between the speakers is left at the initial set value, The angle θ ″ between the speaker center point and the position of the head is the default angle θ
The direction of each speaker is rotated to a different value (ΦL and ΦR) so as to approach the head, and a delay time corresponding to the difference in the distance between the head and each speaker is given to the signal of the speaker approaching the head. Just do it.

The rotation of the loudspeaker and the setting of the signal delay time due to the movement of the head described above can all be calculated geometrically. Therefore, the result calculated in advance for a typical head movement position is used. The above-described control can be realized by preparing a table that has been read, reading the table with a microcomputer, and setting the rotation of the speaker, the speaker interval, and the delay time. However, when performing control satisfying the condition of FIG. 14A, it is necessary to add a configuration for changing the width of each speaker in addition to the configuration shown in FIG.
The following equation shows that the initial setting position when the preset value of each coefficient in the SD network unit is determined is the angle θ = 5 ° between the head and each speaker and the distance D = head = Speaker shown in FIG. 1.4m, distance between speakers W = 0.245m
Should be used only when the angle θ between the head and each speaker is maintained as much as possible at the initial set value (5 °) when the head moves left and right (ΔT1) or when the distance D changes. This is an arithmetic expression for calculating the set values of the rotation angle ΦL of the left speaker, the rotation angle ΦR of the right speaker, the distance W between the speakers, and the delay time Dt of the left or right channel signal.

[0053]

(Equation 4)

(Equation 5)

The following table shows an example in which each value is calculated by using these equations under the above initial conditions. In this example, as an example, the maximum value of the inter-speaker distance W is limited to 35 cm. In each column of the table below, the rotation angle ΦL of the left speaker (clockwise is positive) and the rotation angle ΦR of the right speaker
(Clockwise is positive), the distance W between the speakers, the channel (left (L) or right (R)) that gives the delay, and the delay time Dt of the left or right channel signal are arranged in order from the top.

[0055]

[Table 2]

[0056]

As described above, according to the present invention, since the rotation of the speaker is controlled in accordance with the detected position of the microphone, for example, a plurality of speaker units close to each other or a head-related transfer function is used. When trying to realize a small and sufficient three-dimensional sound reproduction by crosstalk cancellation etc., it is possible to obtain a sound effect that makes a singer feel a three-dimensional effect in a wider range than before,
Even when the singer moves, a sufficient sound effect can always be maintained.

[Brief description of the drawings]

FIG. 1 is an external view showing an embodiment of a karaoke apparatus with integrated speakers according to the present invention.

FIG. 2 is an explanatory diagram for explaining an internal mechanism of the embodiment shown in FIG. 1;

FIG. 3 is a block diagram showing an internal configuration of the embodiment shown in FIG.

FIG. 4 is an explanatory diagram for describing details of functions of an SD network unit 190 shown in FIG. 3;

FIG. 5 is a block diagram for explaining an internal configuration of an SD network unit 190 shown in FIG.

FIG. 6 is a block diagram showing an internal configuration of a speaker direction detection unit 176 shown in FIG.

FIG. 7 is a flowchart for explaining the operation of the speaker direction detection unit 176 shown in FIG.

8 is a timing chart for explaining an operation of the speaker direction detection unit 176 shown in FIG.

FIG. 9 is an external view showing another embodiment of the karaoke apparatus with an integrated speaker according to the present invention.

FIG. 10 is an explanatory diagram for explaining an internal mechanism of the embodiment shown in FIG. 9;

11 is a block diagram illustrating an internal configuration of a speaker direction detection unit 176a illustrated in FIG.

12 is a flowchart illustrating the operation of speaker direction detection section 176 shown in FIG.

FIG. 13 is a schematic diagram for explaining the operation of the speaker direction detection unit 176a shown in FIG.

FIG. 14 is a schematic diagram for explaining a modified example of the speaker-integrated karaoke apparatus according to the present invention.

FIG. 15 is an external view showing an example of a conventional speaker-integrated karaoke apparatus.

[Explanation of symbols]

102, 102a, 103, 103a ... middle and high frequency speakers, 114, 115 ...
High frequency microphone, 150… Rotary drive motor, 151… Gear, 152
... Bearing, 164 ... Microphone amplifier, 163 ... Music generator, 17
4… Stereo power amplifier, 175… 2ch (channel) microphone amplifier, 176,176a… Speaker direction detector, 177,177a
... Speaker drive control unit, 190 ... SD network, 191:
Sound image localization network, 192: crosstalk cancellation network, 320: microphone for singer, 321: high frequency generator, 401, 402: rotary drive motor, 403: delay circuit.

Claims (3)

[Claims] 1. An audio signal input unit for inputting an audio signal using a microphone, an audio signal generating unit for generating an audio signal for karaoke accompaniment, a speaker, and a speaker rotation for rotating the direction of the speaker Means for generating a speaker drive signal for generating a speaker drive signal for generating a sound from the speaker based on an audio signal input by the audio signal input means and an audio signal generated by the audio signal generation means. Means, microphone position detecting means for detecting the position of the microphone by wireless detection, and speaker direction control means for driving the speaker direction rotating means according to the microphone position detected by the microphone position detecting means. A karaoke apparatus with a built-in speaker. 2. The speaker according to claim 1, wherein the speaker includes at least two speaker units that are close to each other, and the speaker-direction rotating unit controls the directions of the at least two speaker units. A sound image localization processing unit that performs predetermined sound image localization processing on the sound signal generated by the sound signal generation unit to generate sound image localization sound signals of two channels on the left and right; and a sound image localization processing unit for each channel output from the sound image localization processing unit. When the sound based on the sound image localization sound signal is emitted from the plurality of speaker units, each of the sounds emitted from each speaker unit is left and right of a singer who inputs an audio signal using the microphone without generating crosstalk. Crosstalk canceling means for performing arithmetic processing on each sound image localized sound signal so as to reach the ear. The karaoke apparatus with a built-in speaker according to claim 1, wherein 3. The speaker drive signal generating means performs a delay process on each speaker drive signal for driving the plurality of speaker units according to a control direction of the direction of each speaker unit. 3. A karaoke apparatus with a built-in speaker according to claim 2.