JP2018195987A - Speaker device and amplifier device - Google Patents

Abstract

To enlarge the manner of usage of a speaker device.SOLUTION: In a stereo mode, a switch SW1 is changed so that audio signals input from input terminals 13L and 13R will be output to speakers 11L and 11R. In a monaural mode, the switch SW1 is changed so that audio signals input from a first input terminal 13L will be output to both the speakers 11L and 11R. An equalizer 14 corrects the characteristics of the audio signals input from the first input terminal 13L in an effective mode and does not correct the characteristics in an invalid mode.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a speaker device having a left speaker and a right speaker integrally connected to each other, and an amplifier device.

  2. Description of the Related Art Conventionally, a speaker device generally has a left speaker and a right speaker that emit sound from left and right channels, respectively, and a so-called integrated speaker device in which these are integrally connected is also known (Non-Patent Document 1 below) ). In this type of speaker device, a plug is usually inserted into each of the left and right input terminals, and the left and right audio signals are input to produce a stereo sound.

“JVC Portable Speaker SP-A55”, [online], [Search March 17, 2017], Internet <URL: http://www3.jvckenwood.com/accessory/speaker/sp-a55/>

  However, since the integrated speaker device is generally highly demanded for miniaturization, the diameter of the speaker is relatively small, the distance between the left and right speakers is short, and the passband of the speaker is narrow. Since the aperture is small, the output is not sufficient, and because the pass band is narrow, the reproduction capability particularly at low frequencies is inferior. In addition, since the distance between the speakers is short, the stereo feeling is thin, and there is a problem that the feeling of localization is lost especially when the body is moved, and the sound service area is narrow.

  Even if two integrated speaker devices having the same configuration are provided, an aspect of effectively using them has not been proposed, and the value of using two speaker devices has not been found so much. An amplifier device that amplifies an audio signal and outputs the amplified audio signal to a speaker device is also known. Even when an amplifier device is connected to a speaker device, the value of using two speaker devices has not been found so much.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a speaker device and an amplifier device that can expand the usage of the speaker device.

  In order to achieve the above object, a speaker device according to claim 1 of the present invention includes a left speaker (11L) and a right speaker (11R) integrally connected to each other, and a first input for inputting at least an audio signal. The terminal (13L) and the second input terminal (13R) can be switched between a monaural mode and a stereo mode. In the stereo mode, an audio signal input from the first input terminal is used as the left speaker. And the audio signal input from the second input terminal is output to the right speaker. In the monaural mode, the audio signal input from the first input terminal is output to the left speaker and the right speaker. Switching means (SW1) that outputs to both the active mode and the invalid mode It is possible to correct the characteristic of the audio signal input from the first input terminal in the valid mode, and to correct the characteristic of the audio signal input from the first input terminal in the invalid mode. And means (14).

  In order to achieve the above object, an amplifier device according to claim 6 of the present invention is integrally connected to a first input terminal (33L) and a second input terminal (33R) for inputting at least an audio signal. The left output terminal (35-1L, 35-2L) and the right output terminal (35-1R, 35-2R) for outputting a stereo audio signal to the speaker device (20) having the left speaker and the right speaker. The first set of stereo output terminals (35-1L, 1R) and the second set of stereo output terminals (35-2L, 2R) may be switched to the first mode and the second mode. In the first mode, the audio signal input from the first input terminal is output from the left output terminal (35-1L) of the first set of stereo output terminals. The audio signal input from the second input terminal is output from the right output terminal (35-1R) of the first set of stereo output terminals, and in the second mode, the first input terminal Are output from both the left output terminal and the right output terminal (35-1L, 1R) of the first set of stereo output terminals, and the audio signal is input from the second input terminal. The output switching means (SW1) for outputting a signal from both the left output terminal and the right output terminal (35-2L, 2R) of the second set of stereo output terminals, and switching between the valid mode and the invalid mode may occur. And in the effective mode, the characteristics of the audio signal input from the first input terminal and the audio signal input from the second input terminal Correction means (34L, 34R) that corrects and does not correct the characteristics of the audio signal input from the first input terminal and the audio signal input from the second input terminal in the invalid mode. It is characterized by.

  In addition, the code | symbol in the said parenthesis is an illustration.

  ADVANTAGE OF THE INVENTION According to this invention, the utilization aspect of a speaker apparatus can be expanded.

  According to the second and seventh aspects, for example, when two speaker devices are used as a stereo speaker system, it is possible to automatically realize an adjustment such as an increase in volume. According to the third, fourth, eighth, and ninth aspects, for example, when two speaker devices are used as a stereo speaker system, it is possible to automatically realize adjustment such as expansion of a pass band. According to the fifth and tenth aspects, the volume and the pass band can be adjusted.

It is a perspective view of a speaker system, and a figure showing composition of a speaker device. It is a figure which shows the operation example in the case of using two speaker apparatuses. It is a figure which shows the pass band ((a), (b), (d), (e)) of the one side channel of a speaker apparatus, and the example ((c)) of the correction characteristic of an equalizer. It is a figure which shows the structure of the speaker apparatus of a modification, and the block diagram of the principal part. It is a figure which shows the utilization aspect example of an amplifier apparatus. It is a figure which shows the structure of the amplifier apparatus of a modification.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1A is a perspective view of a speaker system to which the speaker device according to the first embodiment of the present invention is applied. The speaker system is configured by supporting two speaker devices 10 (10-1, 10-2) having the same configuration on a stand 1. The speaker device 10 includes a left speaker 11L and a right speaker 11R that are integrally connected to each other. The speaker device 10 includes operating elements 15 and 16. FIG. 1A shows an example in which two speaker devices 10 are used. The speaker devices 10-1 and 10-2 do not necessarily have to be supported by a support portion such as a stand. It is also possible to use a mode of mounting on the screen. Although the user may use the speaker device 10 alone, this embodiment discloses an effective form in which two speaker devices 10 are used (FIG. 2).

  FIG. 1B is a diagram illustrating a configuration of the speaker device 10. The speaker device 10 has a first input terminal 13L and a second input terminal 13R for inputting at least an audio signal. Amplifiers 12L and 12R are connected to the left speaker 11L and the right speaker 11R, respectively. The speaker device 10 has a changeover switch SW1. The changeover switch SW1 is output switching means for switching the input source of the signal to the amplifier 12R between the first input terminal 13L and the second input terminal 13R. The input source of the signal to the amplifier 12R becomes the first input terminal 13L when the changeover switch SW1 is switched to the contact TL side, and becomes the second input terminal 13R when the changeover switch SW1 is switched to the contact TR side. An equalizer (EQ) 14 is connected between the first input terminal 13L and the amplifier 12L. Accordingly, the first input terminal 13L, the equalizer 14, the amplifier 12L, and the left speaker 11L are arranged on the left line, and the second input terminal 13R, the changeover switch SW1, the amplifier 12R, and the right speaker 11R are arranged on the right line. A terminal TL of the changeover switch SW1 is connected between the equalizer 14 and the amplifier 12L in the left line. As will be described in detail later, the equalizer 14 is a correction unit that corrects the characteristics of the audio signal input from the first input terminal 13L in accordance with the mode.

  A plug 39 can be inserted into each of the first input terminal 13L and the second input terminal 13R. The plug 39 is a known multipolar plug having a plurality of terminals, and one of the plurality of terminals is used as a terminal for detecting that the plug 39 has been inserted. In the present embodiment, in particular, when the plug 39 is inserted into the second input terminal 13R, the insertion is detected by an electrical method using a resistance change or the like, and the changeover switch SW1, the equalizer is selected according to the detection result. 14 automatically switch together.

  In the present embodiment, the output mode includes a monaural mode and a stereo mode, and the operation mode of the equalizer 14 includes a valid mode and an invalid mode. The output mode is the stereo mode when the plug 39 is inserted into the second input terminal 13R, and the monaural mode when the plug 39 is not inserted into the second input terminal 13R. The operation mode of the equalizer 14 is the invalid mode when the plug 39 is inserted into the second input terminal 13R, and the valid mode when the plug 39 is not inserted into the second input terminal 13R.

  When one speaker device 10 is used as a single stereo speaker device, the user normally inserts the left plug 39L into the first input terminal 13L and inserts the right plug 39R into the second input terminal 13R. . As a result, the output mode becomes the stereo mode. In the stereo mode, the speaker device 10 switches the changeover switch SW1 to the contact TR side, and an audio signal (usually an L channel signal) input from the first input terminal 13L is sent to the left speaker 11L via the amplifier 12L. In addition to outputting, an audio signal (usually an R channel signal) input from the second input terminal 13R is output to the right speaker 11R via the amplifier 12R. At this time, the speaker device 10 sets the operation mode of the equalizer 14 to the invalid mode, so that the audio signal input from the first input terminal 13L is output without correcting the characteristics.

  2A and 2B are diagrams illustrating an operation example when two speaker devices 10 are used. As an example, it is possible to realize a stereo speaker system in which two speaker devices 10 cooperate to expand the volume. The user inserts a plug 39 (for example, plug 39L) into the first input terminal 13L for one speaker device 10, for example, the speaker device 10-1 (FIG. 2A). The user inserts a plug 39 (for example, a plug 39R) into the first input terminal 13L for the other speaker device 10, for example, the speaker device 10-2 (FIG. 2B). Since neither of the speaker devices 10-1 and 10-2 has the plug 39 inserted in the second input terminal 13R, the output mode is a monaural mode and the operation mode of the equalizer 14 is an effective mode.

  Accordingly, in each speaker device 10, the changeover switch SW1 is switched to the contact TL side, and the equalizer 14 performs a correction operation. In the speaker device 10-1, the audio signal input from the first input terminal 13L is corrected in characteristics and output to the left speaker 11L and the right speaker 11R via the amplifiers 12L and 12R, respectively. In the speaker device 10-2, the audio signal input from the first input terminal 13L is corrected in characteristics and output to the left speaker 11L and the right speaker 11R via the amplifiers 12L and 12R, respectively. If an L-channel signal is input to the first input terminal 13L of the speaker device 10-1, and an R-channel signal is input to the first input terminal 13L of the speaker device 10-2, the speaker device 10-1 The speakers 11L and 11R output L channel signals, and the speakers 11L and 11R of the speaker device 10-2 output R channel signals. Thereby, although each of the speaker devices 10-1 and 10-2 is in the monaural mode, since sound is generated by the two speakers 11L and 11R, for example, a stereo output with an increased volume is realized. In addition, the audio signal of each channel is output with its characteristics corrected.

  FIGS. 3A to 3E are diagrams showing the relationship between the pass band (reproduction band) of one channel of the speaker device 10 and the correction characteristic of the equalizer 14. In each figure, the horizontal axis represents frequency and the vertical axis represents sound pressure (dB). As shown in FIG. 3A, in the pre-correction output 41 of the one-side channel of the speaker device 10, the pass band is a range from the lowest frequency Fmin to the highest frequency Fmax. Strictly speaking, the minimum frequency Fmin and the maximum frequency Fmax are frequencies at which the sound pressure is lowered by 3 dB from the lower and upper limit values in the frequency region where the sound pressure is substantially constant and becomes maximum. In the example of FIG. 3A, the frequency at which the sound pressure is “−3 dB” with respect to 0 dB as a reference is the lowest frequency Fmin and the highest frequency Fmax.

  It is assumed that signals from the same source (for example, both are L channel signals) are input to the first input terminals 13L of the speaker devices 10-1 and 10-2. Here, if correction by the equalizer 14 is not performed, an output 42 with a sound pressure increased by 6 dB is obtained as shown in FIG. Therefore, as described above, if the L and R channel signals are respectively input to the first input terminals 13L of the speaker devices 10-1 and 10-2, and the correction by the equalizer 14 is not performed, The stereo pronunciation that is almost doubled is realized. However, the passband does not change in this state.

FIG. 3C shows the correction characteristic 43 of the equalizer 14. As an example, the equalizer 14 corrects the signal level in the frequency region from the vicinity of the lowest frequency Fmin to the vicinity of the highest frequency Fmax in the audio signal to be low in the effective mode. The equalizer 14 is configured by combining a low shelving filter and a high shelving filter. The low shelving filter corrects the signal level on the side higher than the predetermined frequency to be lowered by, for example, 6 dB. The high shelving filter corrects the signal level on the side lower than the predetermined frequency to be lowered by, for example, 6 dB. Here, the attenuation of the signal level is set to 6 dB in order to suppress the volume from being doubled by using two speaker devices 10 to be equal to the volume of one speaker device 10. . Strictly speaking, the attenuation amount is preferably set to 20 × _{Log 10} 2 value calculated by (approximately 6.02 dB). The predetermined frequency of the low shelving filter is designed to substantially match the lowest frequency Fmin, and the predetermined frequency of the high shelving filter is designed to substantially match the highest frequency Fmax.

  When the output 42 (FIG. 3B) is corrected by the equalizer 14 with the correction characteristic 43 (FIG. 3C), a corrected output 44 is obtained as shown in FIG. 3D. Comparing the post-correction output 44 and the pre-correction output 41 (FIG. 3A) shows that the passband is expanded as shown in FIG. 3E. As shown in FIGS. 2 (a) and 2 (b), if the equalizer 14 has the correction characteristic 43 in a mode in which two speaker devices 10 are used, the sound volume is equivalent to that when one speaker device 10 is used. While maintaining the above, the passband can be expanded. Note that various post-correction outputs 44 can be obtained depending on the setting of the predetermined frequency in the low shelving filter and the high shelving filter and the setting of the degree of correction of the signal level. Therefore, the volume and passband can be adjusted by the design of the equalizer 14.

  According to the present embodiment, in the stereo mode, the change-over switch SW1 is switched so that the audio signals input from the input terminals 13L and 13R are output to the speakers 11L and 11R, respectively. In the monaural mode, the first input terminal The changeover switch SW1 is switched so that the audio signal input from 13L is output to both the speakers 11L and 11R. Further, the equalizer 14 switches the characteristic of the audio signal input from the first input terminal 13L to be corrected in the valid mode and not corrected in the invalid mode. As a result, by using two speaker devices 10, the volume can be increased and the passband can be expanded, and the usage mode of the speaker device can be expanded. Further, since the two speaker devices 10 can be arranged apart from each other, it is easy to clarify the stereo feeling and expand the service area.

  Specifically, the change-over switch SW1 becomes a stereo mode when the plug 39 is inserted into the second input terminal 13R, and becomes a monaural mode when the plug 39 is not inserted. For example, the two speaker devices 10 are connected to the stereo speaker system. When using as, it is possible to automatically realize adjustment such as volume increase. Further, the equalizer 14 becomes invalid when the plug 39 is inserted into the second input terminal 13R and becomes valid when the plug 39 is not inserted. For example, when using the two speaker devices 10 as a stereo speaker system, Adjustment such as enlargement of the pass band can be realized automatically. In particular, the equalizer 14 corrects the signal level in the frequency region from the vicinity of the lowest frequency Fmin to the vicinity of the highest frequency Fmax in the speaker pass bands of the speakers 11L and 11R so that the volume and the pass band can be adjusted.

  Note that although the stereo mode / monaural mode and the valid mode / invalid mode are both switched depending on whether or not the plug 39 is inserted into the second input terminal 13R, the configuration is not limited thereto. A modification will be described with reference to FIG.

  FIG. 4A is a diagram illustrating a configuration of a speaker device 10 according to a modification. The speaker device 10 shown in FIG. 4A has a two-pole double-headed switch configuration, and is different from the speaker device 10 shown in FIG. 1B in that a changeover switch SW2 is added. The changeover switch SW2 is disposed between the equalizer 14 and the amplifier 12L in the left line. The contact TR2 of the changeover switch SW2 is directly connected to the first input terminal 13L. A contact TL2 of the changeover switch SW2 is connected to the output side of the equalizer 14. The configuration of the other parts of the speaker device 10 is the same as that shown in FIG. The changeover of the changeover switch SW2 to the contact TL2 side and the TR2 side corresponds to the valid mode and invalid mode of the equalizer 14, respectively.

  The mode of changeover of the changeover switch SW1 is the same as the example of FIG. The changeover switch SW2 is configured to be switched in conjunction with the changeover switch SW1, and when the changeover switch SW1 is changed to the contact TL side, the changeover switch SW2 is changed to the contact TL2 side. Accordingly, the operation mode of the equalizer 14 is a valid mode in which the changeover switch SW2 is switched to the contact TL2 side when the output mode is the monaural mode, and is invalid in which the changeover switch SW2 is switched to the contact TR2 side when the output mode is the stereo mode. It becomes a mode. In the stereo mode and the invalid mode, the audio signal input from the first input terminal 13L is output to the left speaker 11L via the amplifier 12L, and the audio signal input from the second input terminal 13R is output from the amplifier 12R. Is output to the right speaker 11R. At that time, the audio signal is not corrected.

  Note that the changeover switch SW2 may be configured to be switched according to whether or not the plug 39 is inserted, similarly to the changeover switch SW1. The stereo mode / monaural mode and the valid mode / invalid mode may be manually switched by the user. In this case, for example, the stereo mode / monaural mode can be switched by the operation of the operation element 15 (FIG. 1A), and the valid mode / invalid mode can be switched by the operation of the operation element 16 (FIG. 1A). May be. Alternatively, as shown in FIG. 4 (b), the control unit may be configured to switch and control each mode.

  FIG. 4B is a block diagram illustrating a configuration of a main part of the speaker device 10 according to the modification. The speaker device 10 includes a detection unit 17 and a CPU 18. The detection unit 17 may be configured to detect whether or not the plug 39 is inserted into the second input terminal 13R, and may use the electrical detection method described with reference to FIG. It is also possible to use simple detection. The speaker device 10 includes a storage unit such as a RAM in addition to the components shown in FIG. The changeover switches SW1 and SW2 may be configured by elements that can be switched by the CPU 18. The CPU 18 controls switching of the changeover switch SW1 and the changeover switch SW2 based on the detection result by the detection unit 17. For example, when the detection unit 17 detects the insertion of the plug 39 into the second input terminal 13R, the CPU 18 controls to be in the monaural mode and the effective mode. The control based on the detection result by the detection unit 17 may be applied to only one of the changeover switches SW1 and SW2.

  In addition, although the equalizer 14 was illustrated as a correction | amendment means which correct | amends the characteristic of the audio signal input from the 1st input terminal 13L, it is not restricted to this. For example, a DSP (digital signal processor) may be provided, and the DSP may be responsible for correcting the characteristics of the audio signal.

(Second Embodiment)
In the present embodiment, an amplifier device that amplifies an audio signal and outputs it to a speaker device will be described. FIGS. 5A and 5B are diagrams illustrating an example of how the amplifier device 30 is used. In the present embodiment, a known speaker device 20 connected to the amplifier device 30 can be adopted. The speaker device 20 includes a left speaker 11L and a right speaker 11R that are integrally connected to each other, but does not need to include an amplifier. FIG. 5A shows a mode in which one speaker device 20 is connected, and FIG. 5B shows a mode in which two speaker devices 20 are connected.

  The amplifier device 30 includes a first input terminal 33L and a second input terminal 33R similar to the first input terminal 13L and the second input terminal 13R (FIG. 1B). The amplifier device 30 has a first set of stereo output terminals in which the left output terminal 35-1L and the right output terminal 35-1R are one set. In addition, the amplifier device 30 has a second set of stereo output terminals in which the left output terminal 35-2L and the right output terminal 35-2R form one set. Amplifiers 32-1L and 32-1R are connected to the output terminals 35-1L and 35-1R, respectively. Amplifiers 32-2L and 32-2R are connected to the output terminals 35-2L and 35-2R, respectively. The speaker device 20 has a changeover switch SW1. The changeover switch SW1 is an output changeover means for changing the input source of the signal to the amplifier 32-1R between the first input terminal 33L and the second input terminal 33R. The signal input source to the amplifier 32-1R becomes the first input terminal 33L when the changeover switch SW1 is switched to the contact TL side, and becomes the second input terminal 33R when the changeover switch SW1 is switched to the contact TR side.

  An equalizer 34L is connected between the first input terminal 33L and the connection point 38L. An equalizer 34R is connected between the second input terminal 33R and the connection point 38R. The connection point 38L is connected to the contact TL and the amplifier 32-1L, and the connection point 38R is connected to the contact TR and the amplifiers 32-2L and 32-2R. In the present embodiment, there are a first mode and a second mode as output modes, and an operation mode of the equalizer 14 includes a valid mode and an invalid mode similar to those in the first embodiment. When the speaker device 20 is connected / not connected to the second set of stereo output terminals (35-2L, 35-2R), the output mode becomes the second mode / first mode, respectively. The operation modes of the equalizers 34 are the valid mode / invalid mode, respectively, when the speaker device 20 is connected / not connected to the second set of stereo output terminals (35-2L, 35-2R). The characteristics of each equalizer 34 are the same as the characteristics of the equalizer 14 described in the first embodiment (FIG. 3C, etc.).

  When only one speaker device 20 is connected to the amplifier device 30 for use, the user normally has a first set of stereo output terminals (35-1L, 35-1R) as shown in FIG. Are connected to the speakers 11L and 11R of the speaker device 20, respectively. As a result, the first switch SW1 is switched to the contact TR side, and the equalizers 34L and 34R are disabled. Therefore, the audio signal input from the first input terminal 33L is output from the output terminal 35-1L to the left speaker 11L via the amplifier 32-1L without being corrected by the equalizer 34L. Also, the audio signal input from the second input terminal 33R is output from the output terminal 35-1R to the right speaker 11R via the amplifier 32-1R without being corrected by the equalizer 34R. In this case, the speaker device 20 produces stereo sound independently.

  On the other hand, when two speaker devices 20 (speaker devices 20-1 and 20-1) having the same configuration are connected to the amplifier device 30 and used, the user usually has the first step as shown in FIG. The speakers 11L and 11R of the speaker device 20-1 are connected to one set of stereo output terminals (35-1L and 35-1R), respectively, and the second set of stereo output terminals (35-2L and 35-2R) are respectively connected. The speakers 11L and 11R of the speaker device 20-2 are connected. As a result, the second switch SW1 is switched to the contact TL side, and the equalizers 34L and 34R are in the effective mode. Therefore, the audio signal input from the first input terminal 33L is corrected by the equalizer 34L, and is output from the output terminals 35-1L and 35-1R via the amplifiers 32-1L and 32-1R, respectively, to the speaker device 20-1. Are output to the speakers 11L and 11R. Also, the audio signal input from the second input terminal 33R is corrected by the equalizer 34R, and the speaker device 20-2 from the output terminals 35-2L and 35-2R via the amplifiers 32-2L and 32-2R, respectively. Are output to the speakers 11L and 11R. In this case, the speaker device 20-1 is in charge of the L channel, and the speaker device 20-2 is in charge of the R channel.

  According to the present embodiment, it is possible to increase the volume and passband by using two speaker devices 20, and to achieve the same effects as the first embodiment with respect to expanding the usage mode of the speaker device. Can play. Further, the volume and the passband can be adjusted by the design of the equalizer 34.

  It should be noted that the first mode / second mode and the valid mode / invalid mode are both switched depending on whether or not the speaker device 20 is connected to the second set of stereo output terminals (35-2L, 35-2R). However, it is not limited to this. A modification will be described with reference to FIG.

  FIG. 6 is a diagram illustrating a configuration of an amplifier device 30 according to a modification. The amplifier device 30 shown in FIG. 6 has a three-pole double-headed switch configuration, and is different from the amplifier device 30 shown in FIG. 5A in that changeover switches SW2 and SW3 are added. The changeover switch SW2 is disposed between the equalizer 34L and the connection point 38L. The changeover switch SW3 is disposed between the equalizer 34R and the connection point 38R. A contact TL2 of the changeover switch SW2 is connected to the output side of the equalizer 34L. The contact TR2 of the changeover switch SW2 is directly connected to the first input terminal 33L. The contact TL3 of the changeover switch SW3 is connected to the output side of the equalizer 34R. The contact TR3 of the changeover switch SW3 is directly connected to the second input terminal 33R. The configuration of other parts of the amplifier device 30 is the same as that shown in FIG. When the changeover switch SW2 is switched to the contact TL2 side and the TR2 side, the equalizer 34L enters the valid mode and the invalid mode, respectively. When the changeover switch SW3 is switched to the contact TL3 side and the TR3 side, the equalizer 34R enters the valid mode and the invalid mode, respectively.

  The mode of changeover of the changeover switch SW1 is the same as the example of FIGS. The changeover switches SW2 and SW3 are configured to be switched in conjunction with the changeover switch SW1. The changeover switches SW2 and SW3 are switched to the contact TL2 side and the contact TL3 side when the changeover switch SW1 is switched to the contact TL side, and are switched to the contact TR2 side and the TR3 side when the changeover switch SW1 is switched to the contact TR side. Therefore, when the output mode is the first mode, the operation mode of the equalizer 34L is an invalid mode in which the changeover switches SW2 and SW3 are switched to the contact TR2 side and the TR3 side, respectively, and the output mode is the second mode. This is an effective mode in which the changeover switches SW2 and SE3 are switched to the contact TL2 side and the TL3 side, respectively.

  In the first mode and the invalid mode, the audio signals input from the input terminals 33L and 33R are not corrected by the equalizers 34L and 34R, but are output through the amplifiers 32-1L and 32-1R. 1L and 35-1R are output to the speakers 11L and 11R of the speaker device 20-1. In this case, the speaker device 20-1 produces stereo sound independently.

  On the other hand, in the second mode and the effective mode, the audio signal input from the input terminal 33L is corrected by the equalizer 34L and is output through the amplifiers 32-1L and 32-1R, respectively, to the output terminals 35-1L and 35-. 1R is output to the speakers 11L and 11R of the speaker device 20-1. Also, the audio signal input from the second input terminal 33R is corrected by the equalizer 34R, and the speaker device 20-2 from the output terminals 35-2L and 35-2R via the amplifiers 32-2L and 32-2R, respectively. Are output to the speakers 11L and 11R. In this case, the speaker devices 20-1 and 20-2 cooperate to produce a stereo sound.

  Note that the switches SW2 and SW3 may be configured to switch according to whether or not the speaker device 20 is connected to the second set of stereo output terminals (35-2L, 35-2R), similarly to the switch SW1. The first mode / second mode and the valid mode / invalid mode may be configured to be switchable by the operation of the operators 15 and 16 (FIG. 1A) by the user. Or it is good also as a structure which switches each mode (switch SW1, SW2, SW3) and is controlled by a control part (CPU etc.) similarly to having demonstrated in FIG.4 (b). Note that the control based on the detection result by the detection unit 17 may be applied to only one of the changeover switches SW1, SW2, and SW3. Note that although the equalizer 34 is exemplified as the correcting means for correcting the characteristics of the audio signal, the present invention is not limited to this, and the processing for correcting the characteristics of the audio signal may be realized by a DSP.

  In each of the above embodiments, the signals input from the input terminals 13L, 13R, 33L, and 33R may be digital signals. In the case of using a USB (Universal Serial Bus) connection, a USB audio converter may be provided so as to be converted into an analog stereo audio signal and input.

  In each of the above embodiments, the left line and the right line may be reversed. In that case, the detection target of whether or not the plug 39 is inserted may be the first input terminal 13L, and the detection target of the connection or non-connection of the speaker device 20 may be the first set of stereo output terminals. Further, if attention is paid only to the use of expanding the volume by using two speaker devices 10 and 30, the speaker device 10 is configured not to include the equalizer 14, and the amplifier device 30 is configured not to include the equalizers 34L and 34R. Also good.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. A part of the above-described embodiments may be appropriately combined.

10, 20 speaker device, 11L, 11R speaker, 13L, 33L first input terminal, 13R, 33R second input terminal, 14, 34L, 34R equalizer (correction means), 30 amplifier device, 35-1L, 35- 2L left output terminal, 35-1R, 35-2R right output terminal, SW1 changeover switch (output switching means)

Claims (10)

A left speaker and a right speaker connected together,
A first input terminal and a second input terminal for inputting at least an audio signal;
It is possible to switch between the mono mode and the stereo mode. In the stereo mode, the audio signal input from the first input terminal is output to the left speaker and input from the second input terminal. An output switching means for outputting an audio signal to the right speaker, and for outputting the audio signal input from the first input terminal to both the left speaker and the right speaker in the monaural mode;
It is possible to switch between the valid mode and the invalid mode. In the valid mode, the characteristic of the audio signal inputted from the first input terminal is corrected. In the invalid mode, the input is made from the first input terminal. And a correction unit that does not correct the characteristics of the audio signal.   The output switching means is in the stereo mode when a plug is inserted into the second input terminal, and is in the monaural mode when no plug is inserted in the second input terminal. 2. The speaker device according to 1.   The correction means is in the invalid mode when a plug is inserted into the second input terminal, and is in the valid mode when no plug is inserted into the second input terminal. Or the speaker apparatus of 2.   3. The correction unit according to claim 1, wherein the correction unit is in the valid mode when the output switching unit is in the monaural mode, and is in the invalid mode when the output switching unit is in the stereo mode. Speaker device.   The correction means corrects the signal level in the frequency region from the vicinity of the lowest frequency to the vicinity of the highest frequency in the passband of the left speaker and the right speaker so as to decrease in the effective mode. 5. The speaker device according to any one of 4. A first input terminal for inputting at least an audio signal; a second input terminal;
A first set of stereo output terminals and a second set of left and right output terminals for outputting a stereo audio signal to a speaker device having a left speaker and a right speaker connected together. Stereo output terminal,
It is possible to switch between the first mode and the second mode, and in the first mode, the audio signal input from the first input terminal is output to the left side of the first set of stereo output terminals. And the audio signal input from the second input terminal is output from the right output terminal of the first set of stereo output terminals. In the second mode, the audio signal is output from the first input terminal. The input audio signal is output from both the left output terminal and the right output terminal of the first set of stereo output terminals, and the audio signal input from the second input terminal is output from the second set of stereo output terminals. Output switching means for outputting from both the left output terminal and the right output terminal of the output terminal,
It is possible to switch between the valid mode and the invalid mode, and in the valid mode, the characteristics of the audio signal input from the first input terminal and the audio signal input from the second input terminal are corrected, An amplifier apparatus comprising: correction means for correcting characteristics of the audio signal input from the first input terminal and the audio signal input from the second input terminal in the invalid mode.   The output switching means enters the second mode when the speaker device is connected to the left output terminal and the right output terminal of the second set of stereo output terminals. The amplifier device according to claim 6, wherein the first mode is set when the speaker device is not connected to the left output terminal and the right output terminal.   The correction means is in the effective mode when the speaker device is connected to the left output terminal and the right output terminal of the second set of stereo output terminals, and the left output terminal of the second set of stereo output terminals. 8. The amplifier device according to claim 6, wherein the ineffective mode is established when the speaker device is not connected to the right output terminal.   The correction unit is in the valid mode when the output switching unit is in the first mode, and is in the invalid mode when the output switching unit is in the second mode. 8. The amplifier device according to 7. The correction means corrects the signal level in the frequency region from the vicinity of the lowest frequency to the vicinity of the highest frequency in the passband of the left speaker and the right speaker in the speaker device to be lower. The amplifier device according to any one of the above.

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