JP6614194B2 - Acoustic processing system and signal processing apparatus - Google Patents

Description

  The present invention relates to a technique for processing an acoustic signal representing a sound or a sound such as a voice.

  Various techniques for performing a plurality of performers using a plurality of musical instruments have been proposed. For example, Patent Document 1 discloses an ensemble system composed of a plurality of units. An acoustic signal is supplied from the electric musical instrument to each of the plurality of units. The acoustic signal supplied from the electric musical instrument to one unit is further supplied to another unit via different paths. Each unit includes a mixer that mixes an acoustic signal supplied from an electric musical instrument with an acoustic signal supplied from another unit and outputs the mixed signal to headphones. According to the technique of Patent Document 1, it is possible for each performer to perform with a plurality of performers while listening to the performance sounds of others without emitting performance sounds around.

US Pat. No. 8,119,900

  However, in the technique of Patent Document 1, a configuration in which an acoustic signal supplied from an electric musical instrument to a unit is supplied to another unit through different paths, and a mixer for mixing a plurality of acoustic signals is individually installed for each unit. Configuration is required. Therefore, there is a problem that the device configuration is complicated. In view of the above circumstances, an object of the present invention is to simplify a configuration for mixing a plurality of acoustic signals and outputting a mixed signal.

  In order to solve the above problems, a signal processing device according to a preferred aspect of the present invention includes at least one connection terminal connectable to another signal processing device that is separate from the device itself, and at least one connection. An analog bus connected to the terminal; an input terminal connected to the analog bus for receiving the input of the first acoustic signal; and an output terminal connected to the analog bus for outputting the second acoustic signal to the sound emitting device. . In the above aspect, since the analog bus connected to the input terminal and the output terminal is connected to another signal processing device via the connection terminal, a plurality of first acoustic signals input to each signal processing device are mixed. The generated second acoustic signal can be generated with a simple configuration and output to the sound emitting device.

  In a preferred aspect of the present invention, the at least one connection terminal is a plurality of connection terminals connected to different signal processing devices. That is, each of the plurality of connection terminals is connected to a separate signal processing device. Accordingly, it is possible to increase the number of signal processing devices connected as compared with a configuration in which the signal processing device includes one connection terminal. In addition, a configuration including a first resistance element disposed between the input terminal and the analog bus is also preferable.

  The signal processing device according to a preferred aspect of the present invention includes a first adjustment unit that is disposed between the input terminal and the analog bus and adjusts the volume of the first acoustic signal. In the above aspect, since the first adjustment unit adjusts the volume of the first acoustic signal, the volume ratio of the plurality of first acoustic signals in the second acoustic signal can be controlled.

  A signal processing device according to a preferred aspect of the present invention is a second adjustment unit that is disposed between an analog bus and an output terminal and generates a second acoustic signal by adjusting the volume of the acoustic signal supplied from the analog bus. It comprises. In the above aspect, since the second acoustic signal is generated by adjusting the volume of the acoustic signal supplied from the analog bus, the volume of the second acoustic signal is adjusted while maintaining the volume ratio of the plurality of first acoustic signals. Is possible.

  In the signal processing device according to a preferred aspect of the present invention, in the state where the second resistance element and the other signal processing device are connected to the connection terminal, the second resistance element is insulated from the analog bus, while the other signal processing is performed. In a state where the device is not connected to the connection terminal, a connection switching unit that connects the second resistance element to the analog bus is provided. In the above aspect, the second resistance element is insulated from the analog bus when the other signal processing device is connected to the connection terminal, while the second resistance element is not connected to the connection terminal. A resistive element is connected to the analog bus. Therefore, a decrease in the voltage of the second acoustic signal with respect to an increase in the number of signal processing devices connected is suppressed.

  A signal processing device according to a preferred aspect of the present invention includes a third adjustment unit that adjusts a volume of an acoustic signal supplied to a path branched from a path between the input terminal and the analog bus, an analog bus, and an output terminal. And a signal adding unit that adds the acoustic signal supplied from the analog bus and the acoustic signal adjusted by the third adjusting unit. In the above aspect, since the acoustic signal supplied from the analog bus and the acoustic signal adjusted by the third adjustment unit are added, the second analog signal is affected without affecting the acoustic signal of the analog bus across the plurality of signal processing devices. It is possible to selectively adjust the volume of the sound signal of the own device among the sound signals.

  The sound processing system according to a preferred aspect of the present invention includes a plurality of signal processing devices according to any of the aspects exemplified above. Specifically, the sound processing system is a sound processing system including a plurality of signal processing devices that are separate from each other, and each of the plurality of signal processing devices includes the signal processing device among the plurality of signal processing devices. At least one connection terminal connected to another signal processing device other than the above, an analog bus connected to the at least one connection terminal, an input terminal connected to the analog bus and receiving the input of the first acoustic signal, and an analog And an output terminal that is connected to the bus and outputs a second sound signal to the sound emitting device.

1 is a configuration diagram of a sound processing system according to a first embodiment of the present invention. It is a block diagram of a signal processing apparatus. It is explanatory drawing of the state to which the several signal processing apparatus was connected. It is a block diagram of the signal processing apparatus in 2nd Embodiment. It is explanatory drawing of the state in which the several signal processing apparatus in 2nd Embodiment was connected. FIG. 6 is an equivalent circuit diagram of FIG. 5. It is an external view of the signal processing apparatus in 3rd Embodiment. It is a block diagram of the signal processing apparatus in 3rd Embodiment. It is a block diagram of the sound processing system in a modification. It is a block diagram of the sound processing system in a modification. It is a block diagram of the signal processing apparatus in a modification. It is a block diagram of the signal processing apparatus in a modification. It is a block diagram of the signal processing apparatus in a modification.

<First Embodiment>
FIG. 1 is a configuration diagram of a sound processing system 100 according to the first embodiment of the present invention. The sound processing system 100 of the first embodiment is a system used for playing musical instruments by a plurality (N) of users U [1] to U [N] (N is a natural number of 2 or more). As illustrated in FIG. 1, the sound processing system 100 according to the first embodiment includes a plurality (N) of signal processing apparatuses 10 [1] to 10 [N] configured separately from each other, and each signal processing. And a plurality ((N-1)) connection cables 12 for connecting the devices 10 [n] (n = 1 to N) to each other.

  A signal source 22 [n] and a sound emitting device 24 [n] are connected to each signal processing device 10 [n]. The signal source 22 [n] supplies an analog acoustic signal (example of the first acoustic signal) X [n] representing a sound or a sound such as a voice to the signal processing device 10 [n]. For example, an electric musical instrument that outputs an acoustic signal X [n] of a performance sound corresponding to a performance by the user U [n] is a good example of the signal source 22 [n]. Specifically, various types of electric musical instruments such as stringed instruments (guitar or violin), keyboard instruments (piano), and percussion instruments (drums) are used as the signal source 22 [n]. It is also possible to use as a signal source 22 [n] a sound collection device (microphone) that collects the performance sound of a musical instrument or the singing voice of a singer and generates an acoustic signal X [n]. A playback device (for example, a portable music player) that outputs the acoustic signal X [n] stored in the recording medium is also suitable as the signal source 22 [n]. The acoustic signal X [n] is stereo or monaural.

  The signal processing device 10 [n] is an acoustic signal (example of the second acoustic signal) Y [in which N systems of acoustic signals X [1] to X [N] generated by different signal sources 22 [n] are mixed. n] is an analog mixer for supplying the sound emitting device 24 [n]. The sound emitting device 24 [n] is, for example, a headphone or an earphone worn on both ears of the user U [n], and a sound represented by the acoustic signal Y [n] supplied from the signal processing device 10 [n] ( That is, the ensemble sound) is reproduced. Accordingly, each user U [n] can perform while listening to the ensemble sound of the N users U [1] to U [N] with the sound emitting device 24 [n]. In addition, since the configuration of the N signal processing devices 10 [1] to 10 [N] is common, the following description will be given focusing on an arbitrary signal processing device 10 [n].

  As illustrated in FIG. 1, the signal processing device 10 [n] includes a housing 11 formed in a substantially rectangular parallelepiped box shape. On the upper surface of the housing 11, a plurality of operators P (P1 and P2) for receiving operations from the user U [n] are installed. Each operation element P of the first embodiment is a knob that can be arbitrarily rotated by the user U [n]. The user U [n] can adjust the characteristic of the acoustic signal Y [n] generated by the signal processing device 10 [n] by appropriately operating the desired operator P. The positions of the plurality of operation elements P are not limited to the upper surface of the housing 11.

  As illustrated in FIG. 1, the signal processing device 10 [n] includes a plurality of terminals (TIN, TOUT, TC1, and TC2). Specifically, the input terminal TIN, the output terminal TOUT, the connection terminal TC1, and the connection terminal TC2 are installed on the side surface of the housing 11. The positions of the plurality of terminals are not limited to the side surface of the housing 11.

  The input terminal TIN is a stereo jack to which the signal source 22 [n] is detachably connected, and receives an input of the acoustic signal X [n] supplied from the signal source 22 [n]. On the other hand, the output terminal TOUT is a stereo jack to which the sound emitting device 24 [n] is detachably connected, and the sound signal Y [n] generated by the signal processing device 10 [n] is output to the sound emitting device 24 [ output to [n]. The acoustic signal X [n] is wirelessly transmitted from the signal source 22 [n] to the signal processing device 10 [n], or the acoustic signal Y [n] is wirelessly transmitted from the signal processing device 10 [n]. A configuration that is transmitted to the sound emitting device 24 [n] may also be employed. A wireless communication method between the signal source 22 [n] and the signal processing device 10 [n] or a wireless communication method between the signal processing device 10 [n] and the sound emitting device 24 [n] is arbitrary. However, near field communication such as Bluetooth (registered trademark) is suitable.

  The connection terminal TC1 and the connection terminal TC2 of the signal processing device 10 [n] are terminals for connecting the signal processing device 10 [n] (own device) to another signal processing device (hereinafter referred to as “other device”). is there. The connection terminal TC1 and the connection terminal TC2 of the first embodiment are stereo jacks to which plugs at the ends of the connection cable 12 are detachably connected. The connection cable 12 is a cable for electrically connecting the signal processing device 10 [n1] and the signal processing device 10 [n2] (n1 = 1 to N, n2 = 1 to N, n1 ≠ n2). For example, a stereo shield cable is preferably used as the connection cable 12.

  As illustrated in FIG. 1, one or both of the connection terminal TC1 and the connection terminal TC2 in each signal processing device 10 [n] is connected to the connection terminal TC1 or the connection terminal TC2 of the other device via the connection cable 12. . Therefore, as illustrated in FIG. 1, N signal processing apparatuses 10 [1] to 10 [N] are connected in series. Specifically, the connection terminal TC1 of each of the signal processing devices 10 [n] in the second to Nth stages is connected to the connection terminal TC2 of the signal processing device 10 [n-1] in the previous stage. The connection terminal TC1 of the signal processing device 10 [1] located at one end of the N arrays and the connection terminal TC2 of the signal processing device 10 [N] located at the other end are in an open state not connected to other devices. . However, the connection terminal TC1 of the signal processing device 10 [1] and the connection terminal TC2 of the signal processing device 10 [N] are mutually connected (that is, the N signal processing devices 10 [1] to 10 [N] are annularly connected). Can also be connected).

  The number (hereinafter referred to as “number of connections”) N of the signal processing devices 10 [n] connected to each other can be arbitrarily changed. Specifically, N signal processing devices 10 [1] to 10 [N] corresponding to the number of users U [n] who actually participate in the performance are connected. For example, when two users (N = 2), user U [1] and user U [2], perform an ensemble, the signal processing device 10 [1] and the signal processing device 10 [2] are one. The connection cables 12 are connected to each other. In addition, when the ensemble is performed by five users U [1] to U [5] (N = 5), the five signal processing devices 10 [1] to 10 [5] are connected to the four connection cables 12. Connected to each other.

  By the way, Patent Document 1 discloses a configuration including a station (docking station) in which a predetermined number of receiving portions (dock) are formed (hereinafter referred to as “Comparison 1”). In contrast 1, since each of the plurality of units for inputting and outputting the acoustic signal is accommodated in each accommodating portion of the station, it is not possible to connect a unit exceeding the total number of accommodating portions. Therefore, there is a problem that the total number of performers participating in the ensemble is limited. In the first embodiment, since the number N of connections of the signal processing device 10 [n] can be arbitrarily changed, there is an advantage that the number of users U [n] is not limited. Further, in a scene where the system of contrast 1 is actually used, it is necessary to wait for an ensemble until a user who owns and manages the station appears. In the first embodiment, N signal processing devices 10 [1] to 10 [N] corresponding to the number of users U [n] that have already arrived are connected to each other, for example, even when not all of the participants have gathered. You can start ensemble practice at any time by connecting to. In contrast 1, a specific user needs to purchase and manage a station. In the first embodiment, each user U [n] purchases and manages his / her own signal processing device 10 [n]. There is also an advantage that you can do.

  FIG. 2 is an electrical configuration diagram of the signal processing device 10 [n]. As illustrated in FIG. 2, the signal processing device 10 [n] of the first embodiment is an analog circuit including an analog bus 42, a resistance element 44, a first adjustment unit 46, and a second adjustment unit 48. The above elements are installed inside the housing 11. In practice, the analog bus 42, the resistance element 44, the first adjustment unit 46, and the second adjustment unit 48 are installed for each of the left and right channels. Focus only on convenience. For example, a configuration in which the first adjustment unit 46 or the second adjustment unit 48 is installed outside the housing 11, or a configuration in which the first adjustment unit 46 and the second adjustment unit 48 are omitted from the signal processing device 10 [n]. Is also envisaged. According to the configuration in which the first adjustment unit 46 and the second adjustment unit 48 are omitted, there is an advantage that the circuit scale or manufacturing cost of the signal processing device 10 [n] can be reduced.

  The analog bus 42 is a signal line that transmits an analog signal. As illustrated in FIG. 2, the analog bus 42 is connected to the connection terminal TC1 and the connection terminal TC2. Specifically, one end of the analog bus 42 is connected to the connection terminal TC1, and the other end is connected to the connection terminal TC2. Therefore, in the state where N signal processing apparatuses 10 [1] to 10 [N] are connected to each other as illustrated in FIG. 1, each of the N signal processing apparatuses 10 [1] to 10 [N] is connected to each other. The analog bus 42 of the signal processing device 10 [n] is electrically connected. That is, a single bus is formed by connecting the analog buses 42 of the N signal processing devices 10 [1] to 10 [N] with the connection cable 12. FIG. 1 illustrates the configuration in which the connection terminal TC1 of the signal processing device 10 [n] and the connection terminal TC2 of the signal processing device 10 [n-1] are connected. However, as can be understood from FIG. 2, the connection terminal TC1 and the connection terminal TC2 are electrically equivalent, so that the connection between the connection terminals TC1 of the signal processing devices 10 [n] or the signal processing devices 10 [ n] connection terminals TC2 can also be connected. That is, it is not necessary to distinguish between the connection terminal TC1 and the connection terminal TC2 during use. In the state where N signal processing devices 10 [1] to 10 [N] are connected in series as illustrated in FIG. 1, N types of acoustic signals X [1] to X [N] are mixed. Is generated on the analog bus 42 of each signal processing device 10 [n].

  As illustrated in FIG. 2, the resistance element 44 and the first adjustment unit 46 are disposed on a path WA between the input terminal TIN and the analog bus 42. The resistance element 44 (an example of the first resistance element) is an electrical resistance disposed between the input terminal TIN and the analog bus 42. The first adjustment unit 46 is disposed between the input terminal TIN and the resistance element 44, and adjusts the volume of the acoustic signal X [n] supplied from the signal source 22 [n] to the input terminal TIN. Specifically, the first adjustment unit 46 is an amplifier that amplifies the acoustic signal X [n] with a variable gain GA [n]. The gain GA [n] of the first adjustment unit 46 is variably set according to the operation (rotation angle of the operation element P1) on the operation element P1 of the signal processing device 10 [n]. As understood from the above description, the acoustic signal X [n] supplied from the signal source 22 [n] to the input terminal TIN is adjusted to the analog bus via the resistance element 44 after the volume adjustment by the first adjustment unit 46. 42. The first adjustment unit 46 of the first embodiment also functions as a buffer amplifier that reduces the influence of the output impedance of the signal source 22 [n].

  As illustrated in FIG. 2, the second adjustment unit 48 is disposed on the path WB between the analog bus 42 and the output terminal TOUT, and the acoustic signal Y is adjusted by adjusting the volume of the acoustic signal Q supplied from the analog bus 42. Generate [n]. Specifically, the second adjustment unit 48 is an amplifier that amplifies the acoustic signal Q with a variable gain GB [n]. The gain GB [n] of the second adjustment unit 48 is variably set according to the operation (rotation angle of the operation element P2) on the operation element P2 of the signal processing apparatus 10 [n]. The acoustic signal Y [n] adjusted by the second adjustment unit 48 is output from the output terminal TOUT to the sound emitting device 24 [n]. The second adjustment unit 48 of the first embodiment also functions as a headphone amplifier that blocks current from the analog bus 42 to the sound emitting device 24 [n]. Note that the first adjustment unit 46 and the second adjustment unit 48 operate with electric power supplied from, for example, a battery housed in the housing 11. However, it is also possible to operate the first adjustment unit 46 and the second adjustment unit 48 with electric power supplied from an external power source.

したがって、信号処理装置１０[n]の出力端子ＴOUTから出力される音響信号Ｙ[n]は、以下の数式(2)で表現される。

数式(1)および数式(2)から理解される通り、相異なる信号源２２[n]から供給されるＮ系統の音響信号Ｘ[1]〜Ｘ[N]が混合された音響信号Ｙ[n]が信号処理装置１０[n]から放音機器２４[n]に出力される。 FIG. 3 is an explanatory diagram of the relationship between the acoustic signal X [n] (X [1] to X [N]) and the acoustic signal Y [n] (Y [1] to Y [N]). As illustrated in FIG. 3, it is assumed that the analog buses 42 are connected to each other over N signal processing apparatuses 10 [1] to 10 [N]. According to Kirchhoff's law, the acoustic signal Q generated in the analog bus 42 is expressed by the following formula (1) (VMIX = GA [1] X [1] +... + GA [N] X [N]).

Therefore, the acoustic signal Y [n] output from the output terminal TOUT of the signal processing device 10 [n] is expressed by the following equation (2).

As understood from Equations (1) and (2), an acoustic signal Y [n] in which N acoustic signals X [1] to X [N] supplied from different signal sources 22 [n] are mixed. Are output from the signal processing device 10 [n] to the sound emitting device 24 [n].

  As understood from Equation (2), the first adjusting unit 46 adjusts the volume of the acoustic signal X [n], so that the N acoustic signals X [1] to X [N] in the acoustic signal Y [n]. It is possible to control the volume ratio. Further, as understood from the equation (2), the sound signal Y [n] is maintained while maintaining the volume ratio of the N types of sound signals X [1] to X [N] by adjusting the sound volume by the second adjusting unit 48. Can be adjusted (that is, the reproduction volume by the sound emitting device 24 [n]).

  As described above, in the first embodiment, the analog bus 42 connected to the input terminal TIN and the output terminal TOUT is connected to another device via the connection terminal TC1 or the connection terminal TC2. Therefore, an acoustic signal Y [n] in which N acoustic signals X [1] to X [N] supplied to the input terminal TIN of each signal processing device 10 [n] are mixed is generated with a simple configuration. Can be supplied to each sound emitting device 24 [n].

  By the way, assuming a configuration in which the resistance value of the resistance element 44 is sufficiently small (hereinafter referred to as “Comparison 2”), the resistance components of the connection cable 12 and the connection terminal TC (TC1 and TC2) become relatively dominant, and as a result. In addition, the volume ratio of the N-system acoustic signals X [1] to X [N] may be greatly influenced by the resistance components of the connection cable 12 and the connection terminal TC. Further, in the configuration of the comparative 2, for example, an excessive current flows from the output side of the first adjustment unit 46 of the signal processing device 10 [n] to the output side of the first adjustment unit 46 of the other device via the analog bus 42. There is a possibility of flowing. Considering the above circumstances, a configuration in which the resistance element 44 of each signal processing device 10 [n] has a sufficiently large resistance value is preferable. For example, the resistance value of the resistance element 44 is set to 3.3 kΩ. According to the above configuration, the influence of the resistance components of the connection cable 12 and the connection terminal TC on the volume ratio of the N-system acoustic signals X [1] to X [N] is reduced, and excessively via the analog bus 42. It is possible to suppress the generation of current.

  Further, in a scene where a plurality of audio devices such as a mixer are connected to each other, it is generally necessary to connect an input terminal of one audio device and an output terminal of the other audio device. In the signal processing device 10 [n] of the first embodiment, since there is no distinction between signal input / output at each connection terminal TC, either the connection terminal TC1 or the connection terminal TC2 may be connected to another device. Therefore, the problem of erroneous connection of the signal processing device 10 [n] does not occur. Further, since the signal processing device 10 [n] is realized by an analog circuit, there is an advantage that problems such as signal delay and circuit complexity due to A / D conversion and D / A conversion do not occur, for example. .

Second Embodiment
A second embodiment of the present invention will be described. In the first embodiment, as understood from Equation (1), the voltage of the acoustic signal Y [n] tends to decrease as the number N of connections of the signal processing device 10 [n] increases. The second embodiment is a configuration for suppressing a decrease in voltage of the acoustic signal Y [n] with respect to an increase in the number N of connections. In addition, about the element which an effect | action or function is the same as that of 1st Embodiment in each form illustrated below, the code | symbol used by description of 1st Embodiment is diverted, and each detailed description is abbreviate | omitted suitably.

  FIG. 4 is a configuration diagram of the signal processing device 10 [n] in the second embodiment. As illustrated in FIG. 4, in the second embodiment, the resistance element 52 and the connection switching unit 54 are connected to each connection terminal TC (TC1 or TC2) of the signal processing device 10 [n]. The resistance element 52 (an example of the second resistance element) is an electric resistance having a resistance value R2.

  The connection switching unit 54 is a switch that switches electrical connection (conduction or insulation) between the resistance element 52 and the analog bus 42. Specifically, the connection switching unit 54 is a resistor in a state where the plug at the end of the connection cable 12 is inserted into the connection terminal TC of the signal processing device 10 [n] (that is, a state in which another device is connected). The element 52 is electrically isolated from the analog bus 42. On the other hand, the connection switching unit 54 is a resistance element in a state where the plug at the end of the connection cable 12 is not inserted into the connection terminal TC of the signal processing device 10 [n] (that is, the state where no other device is connected). 52 is electrically connected to the analog bus 42. For example, the connection terminal TC, the resistance element 52, and the connection switching unit 54 are realized by a known jack with a switch.

FIG. 5 illustrates a state in which N signal processing devices 10 [1] to 10 [N] in the second embodiment are connected in series. The connection terminal TC1 of the signal processing device 10 [1] and the connection terminal TC2 of the signal processing device 10 [N] are in an open state. Therefore, as illustrated in FIG. 5, the resistance element 52 is connected to the connection terminal TC1 of the signal processing device 10 [1] and the connection terminal TC2 of the signal processing device 10 [N], while the other connection terminal TC. Is insulated from the resistance element 52. FIG. 6 is an equivalent circuit of FIG. As understood from FIG. 6, the following mathematical formula is established by Kirchhoff's law. The symbol R1 is the resistance value of the resistance element 44.

Therefore, the acoustic signal Q generated in the analog bus 42 is expressed by the following formula (3).

  As understood from the mathematical formula (3), according to the second embodiment, it is possible to suppress a decrease in the voltage of the acoustic signal Y [n] with respect to an increase in the number N of connections, as compared with the first embodiment. is there. For example, in the first embodiment, when the number N of connections is increased from 2 to 8, the voltage decrease amount of the acoustic signal Y [n] is 12 dB. On the other hand, in the second embodiment, for example, assuming that the constant a is 8 (R1 = 4R2), the amount of decrease in the voltage of the acoustic signal Y [n] when the number of connections N is increased from 2 to 8 is 4 dB. It is suppressed. In the first embodiment, the volume of the acoustic signal Y [n] is adjusted by an operation on the operator P2, thereby compensating for the decrease in the volume of the acoustic signal Y [n] due to the increase in the number N of connections. Is possible.

<Third Embodiment>
FIG. 7 is a plan view illustrating the appearance of the signal processing device 10 [n] in the third embodiment. As illustrated in FIG. 7, in the casing 11 of the signal processing device 10 [n] of the third embodiment, an operator P3 is installed in addition to the operators P1 and P2 described in the first embodiment. The The operator P3 is a knob that can be arbitrarily rotated by the user U [n], similarly to the operator P1 and the operator P2.

  FIG. 8 is an electrical configuration diagram of the signal processing device 10 [n] in the third embodiment. As illustrated in FIG. 8, the signal processing device 10 [n] of the third embodiment has a configuration in which a third adjustment unit 62 and a signal addition unit 64 are added to the first embodiment. Similar to the first adjustment unit 46 and the second adjustment unit 48, the third adjustment unit 62 and the signal addition unit 64 operate with electric power supplied from a battery or an external power source.

  The third adjustment unit 62 is installed on a path WC branched from the path WA between the input terminal TIN and the analog bus 42. Specifically, the path WC in FIG. 8 is a path branched from a point between the first adjustment unit 46 and the resistance element 44, and reaches the signal addition unit 64 without passing through the analog bus 42. The acoustic signal GA [n] X [n] after adjustment by the first adjustment unit 46 is supplied to the analog bus 42 via the resistance element 44 in the same manner as in the first embodiment, and also through the path WC. 3 is supplied to the adjustment unit 62. The third adjustment unit 62 adjusts the volume of the acoustic signal GA [n] X [n] after adjustment by the first adjustment unit 46. The acoustic signal Z [n] adjusted by the third adjusting unit 62 is supplied to the signal adding unit 64.

  As illustrated in FIG. 8, the third adjustment unit 62 of the third embodiment includes a normal phase adjustment unit 622 and a reverse phase generation unit 623. The normal phase adjustment unit 622 and the reverse phase generation unit 623 are connected in parallel to each other. The normal phase adjustment unit 622 adjusts the volume of the acoustic signal GA [n] X [n] supplied from the path WA to the path WC. Specifically, the positive phase adjustment unit 622 is an amplifier that amplifies the acoustic signal GA [n] X [n] with a variable gain GCa [n]. The gain GCa [n] of the normal phase adjustment unit 622 is variably set according to the operation on the operation element P3 (the rotation angle of the operation element P3).

  The negative phase generation unit 623 generates an acoustic signal having a phase opposite to that of the acoustic signal GA [n] X [n] (that is, a signal obtained by inverting the polarity of the signal). Specifically, the reverse phase generation unit 623 includes a phase inversion unit 624 and a reverse phase adjustment unit 626 as illustrated in FIG. The phase inverter 624 inverts the phase of the acoustic signal GA [n] X [n]. A known technique can be arbitrarily employed for the phase inversion by the phase inversion unit 624. The anti-phase adjusting unit 626 adjusts the volume of the acoustic signal (−1) GA [n] X [n] after being inverted by the phase inverting unit 624. Specifically, the anti-phase adjustment unit 626 is an amplifier that amplifies the acoustic signal (−1) GA [n] X [n] with a variable gain GCb [n]. The gain GCb [n] of the negative phase adjustment unit 626 is variably set according to the operation on the operation element P3 (the rotation angle of the operation element P3). Specifically, the gain GCa [n] and the gain GCb [n] are adjusted in conjunction with each other so that the other increases as one of the gain GCa [n] and the gain GCb [n] increases. That is, the normal phase adjustment unit 622 and the negative phase adjustment unit 626 adjust the volume ratio between the acoustic signal GA [n] X [n] and its negative phase component. Note that it is possible to reverse the order of the phase inversion by the phase inversion unit 624 and the volume adjustment by the reverse phase adjustment unit 626. As understood from the above description, the anti-phase generation unit 623 performs phase inversion and volume adjustment on the acoustic signal GA [n] X [n].

The acoustic signal GCa [n] GA [n] X [n] after adjustment by the normal phase adjustment unit 622 and the acoustic signal GCb [n] (− 1) GA [n] X [n] after adjustment by the negative phase adjustment unit 626 ] Is added from the third adjustment unit 62 to the signal addition unit 64. That is, the acoustic signal Z [n] is expressed by the following mathematical formula (4).

  The signal adder 64 in FIG. 8 is disposed between the analog bus 42 and the output terminal TOUT. The signal adding unit 64 adds the acoustic signal Q supplied from the analog bus 42 and the acoustic signal Z [n] adjusted by the third adjusting unit 62 to thereby add the acoustic signal Y [n] (Y [n] = Q + Z [n]). In FIG. 8, the signal adding unit 64 is disposed between the analog bus 42 and the second adjusting unit 48. However, the signal adding unit 64 may be disposed between the second adjusting unit 48 and the output terminal TOUT. Is possible.

  When the gain GCa [n] of the third adjustment unit 62 is set to a small value (when the gain GCb [n] is set to a large value), as understood from the equation (4), the acoustic signal GA [n ] The signal GCb [n] (-1) GA [n] X [n] obtained by inverting the phase of X [n] becomes relatively dominant in the acoustic signal Z [n]. Therefore, an acoustic signal Y [n] in which the signal component of the acoustic signal X [n] is suppressed among the acoustic signal Q in which the N systems of acoustic signals X [1] to X [N] are mixed is generated. On the other hand, when the gain GCa [n] of the third adjustment unit 62 is set to a large value (when the gain GCb [n] is set to a small value), the acoustic signal GA is understood as understood from Equation (4). [n] X [n] is relatively dominant in the acoustic signal Z [n]. Therefore, the acoustic signal Y [n] in which the signal component of the acoustic signal X [n] in the acoustic signal Q is emphasized is generated. That is, as the gain GCa [n] is set to a smaller value, the signal component of the acoustic signal X [n] in the acoustic signal Q is suppressed, and as the gain GCa [n] is set to a larger value, the sound in the acoustic signal Q is reduced. The signal component of the signal X [n] is emphasized. On the other hand, the acoustic signal Q common to the N signal processing devices 10 [1] to 10 [N] is not affected by the gain GCa [n] and the gain GCb [n].

  As understood from the above description, in the third embodiment, the signal processing device of the reproduced sound (acoustic signal Y [n]) of the signal processing device 10 [n] without affecting the reproduced sound of the other device. It is possible to adjust the volume ratio of the acoustic signal X [n] input to 10 [n]. That is, the user U [n] appropriately operates the operation element P3 while listening to the ensemble sound of the N users U [1] to U [N] with the sound emitting device 24 [n]. It is possible to selectively adjust only the volume of the performance sound.

  In the above description, the third embodiment has been described on the basis of the configuration of the first embodiment, but the second embodiment in which the resistance element 52 and the connection switching unit 54 are connected to each connection terminal TC (TC1 or TC2). The configuration of the embodiment can also be applied to the third embodiment.

<Modification>
The aspect illustrated above can be variously modified. Specific modifications are exemplified below. Two or more modes arbitrarily selected from the following examples can be appropriately combined within a range that does not contradict each other.

(1) In each of the above-described embodiments, the signal processing device 10 [n] having two connection terminals TC (TC1 and TC2) has been exemplified. However, the number of connection terminals TC of the signal processing device 10 [n] is as described above. It is not limited to the illustration. For example, it is possible to install three or more connection terminals TC in the signal processing device 10 [n]. For example, a maximum of three other devices can be connected to the signal processing device 10 [n] in the signal processing device 10 [n] having three connection terminals TC.

  It is also possible to install one connection terminal TC in the signal processing device 10 [n]. In the configuration in which the signal processing device 10 [n] includes one connection terminal TC, two signal processing devices 10 (10 [1] and 10 [2]) are connected through one connection cable 12. The In addition, according to the configuration in which the signal processing device 10 [n] includes a plurality of connection terminals TC as in the above-described embodiments, the configuration is compared with the configuration in which the signal processing device 10 [n] includes one connection terminal TC. Thus, there is an advantage that a large number of signal processing devices 10 [n] can be connected in series by a simple method. In addition, as illustrated in FIG. 9, three or more signal processing devices 10 [n] having one connection terminal TC may be connected to each other by using a connection cable 12 branched into a plurality. Is possible.

(2) In each of the above-described embodiments, the connection cable 12 is used to connect each signal processing device 10 [n]. However, the method for connecting each signal processing device 10 [n] is not limited to the above examples. For example, if a connector is employed as the connection terminal TC, as illustrated in FIG. 10, the connection terminal TC of the signal processing device 10 [n] and the connection terminal TC of the signal processing device 10 [n + 1] are directly connected. It is also possible to do.

(3) In each of the above-described embodiments, the knob that can be rotated by the user U [n] is exemplified as the operation element P, but the specific form of the operation element P is arbitrary. For example, it is possible to arrange a fader type operation element P that can be moved linearly by the user U [n].

  Further, for example, an operator P4 for adjusting the volume ratio (the direction of the sound image) of the stereo left and right channels can be installed. Specifically, as illustrated in FIG. 11, the right adjustment unit 49R and the left adjustment unit 49L are installed in the signal processing device 10 [n] according to the above-described embodiments. The right adjustment unit 49R adjusts the volume of the right channel (Rch) acoustic signal X [n] supplied from the signal source 22 [n] to the input terminal TIN. The left adjustment unit 49L adjusts the volume of the left channel (Lch) acoustic signal X [n] supplied from the signal source 22 [n] to the input terminal TIN. The gains of the right adjustment unit 49R and the left adjustment unit 49L are adjusted in accordance with an operation on the operation element P4 (for example, the rotation angle of the operation element P4). Specifically, the gain of the right adjustment unit 49R and the gain of the left adjustment unit 49L are interlocked with each other so that the gain of one of the right adjustment unit 49R and the left adjustment unit 49L increases as the other gain decreases. Adjusted. The acoustic signal X [n] adjusted by the right adjustment unit 49R is supplied to the first adjustment unit 46 of the right channel, and the acoustic signal X [n] adjusted by the left adjustment unit 49L is the first adjustment unit 46 of the left channel. To be supplied. As understood from the above description, in the configuration illustrated in FIG. 11, the volume ratio (that is, pan) between the acoustic signal X [n] of the right channel and the acoustic signal X [n] of the left channel is adjusted.

(4) The structure of the 3rd adjustment part 62 in 3rd Embodiment is not limited to the illustration of FIG. For example, the third adjustment unit 62 having the configuration illustrated in FIG. 12 may be employed. The third adjustment unit 62 in FIG. 12 includes a normal phase adjustment unit 622, a negative phase generation unit 623, and a variable resistor 628. The functions of the normal phase adjustment unit 622 and the reverse phase generation unit 623 are the same as those in the third embodiment. However, the gain GCa [n] of the normal phase adjustment unit 622 and the gain GCb [n] of the negative phase adjustment unit 626 are set to predetermined fixed values. However, the gain GCa [n] and the gain GCb [n] can be variably set according to an instruction from the user, for example.

  The variable resistor 628 includes the acoustic signal GCa [n] GA [n] X [n] after adjustment by the positive phase adjustment unit 622 and the acoustic signal GCb [n] (− 1) GA [n generated by the reverse phase generation unit 623. ] X [n] is an element that variably sets the mixing ratio, and the resistance value changes according to the operation on the operation element P3 (the rotation angle of the operation element P3). That is, the mixing ratio of the acoustic signal GCa [n] GA [n] X [n] and the acoustic signal GCb [n] (-1) GA [n] X [n] in the acoustic signal Z [n] is the operator P3. It is variably set according to the operation for. Specifically, the variable resistor 628 includes a resistance element connected between the output terminal of the positive phase adjustment unit 622 and the output terminal of the negative phase generation unit 623 and a contact point that contacts the resistance element. The position of the contact point with respect to the resistance element changes according to the operation with respect to the operation element P3. Therefore, the acoustic signal GCa [n] GA [n] X [n] and the acoustic signal GCb [n] (-1) GA [n] X [n] are mixed at a mixing ratio corresponding to the position of the contact. A signal Z [n] is generated at the contact, and is supplied from the contact to the signal adding unit 64. Accordingly, in the configuration of FIG. 12, as in the third embodiment, the reproduced sound (10) of the signal processing device 10 [n] is not affected by the acoustic signal Q generated on the analog bus 42 (and thus the reproduced sound of the other device). Among the sound signals Y [n]), the volume of the performance sound of the user U [n] can be selectively adjusted.

  The third adjustment unit 62 illustrated in FIG. 12 functions as an amplifier that amplifies the acoustic signal GA [n] X [n] supplied to the path WC with a variable gain GC [n]. The gain GC [n] of the third adjustment unit 62 is within a range not less than the minimum value −GCb [n] and not more than the maximum value GCa [n] (−GCb [n] ≦ GC [n] ≦ GCa [n]). It is variably set according to the operation on the operation element P3. When the gain GC [n] is a positive number (GC [n]> 0), the signal component of the acoustic signal X [n] (that is, the performance sound of the user U [n]) among the acoustic signal Q is selectively selected. The acoustic signal Y [n] emphasized in the above is generated. On the other hand, when the gain GC [n] is a negative number (GC [n] <0), the acoustic signal Y [n] is generated by selectively suppressing the signal component of the acoustic signal X [n] in the acoustic signal Q. The

  As illustrated in FIG. 13, the acoustic signal GCa [n] GA [n] X [n] after adjustment by the normal phase adjustment unit 622 and the acoustic signal GCb [n] (− 1) A switch 629 that selects any one of GA [n] X [n] and outputs it as an acoustic signal Z [n] can be installed instead of the variable resistor 628. The switch 629 in FIG. 13 is controlled to either a state in which the output of the normal phase adjustment unit 622 is selected or a state in which the output of the reverse phase generation unit 623 is selected, for example, according to an operation from the user.

(5) The reverse phase generation unit 623 (the phase inversion unit 624 and the reverse phase adjustment unit 626) in the third adjustment unit 62 illustrated in FIG. 8, FIG. 12, or FIG. 13 may be omitted. For example, when the third adjustment unit 62 is configured only by the positive phase adjustment unit 622, the signal component of the acoustic signal X [n] in the acoustic signal Y [n] cannot be selectively suppressed, but the acoustic signal X [ It is possible to adjust the degree of emphasis of n] according to the gain GCa [n]. Similarly, the positive phase adjustment unit 622 in FIG. 8, FIG. 12, or FIG. 13 can be omitted. 8, 12 and 13, the third adjustment unit 62 is installed on the path WC branched from the path between the first adjustment unit 46 and the resistance element 44. However, the input terminal TIN and the first adjustment unit It is also possible to install the third adjustment unit 62 by branching the route WC from the route between the second and the 46.

(6) In the configuration illustrated in FIGS. 1 and 7, the input terminal TIN and the output terminal TOUT are installed on one side surface of the housing 11, and the connection terminal TC1 is installed on the left side surface of the housing 11. Although the connection terminal TC2 is installed on the right side surface of the body 11, the positions of the plurality of terminals (TIN, TOUT, TC1, and TC2) are not limited to the above examples. For example, the connection terminal TC1, the connection terminal TC2, and the output terminal TOUT can be installed on one side surface of the housing 11, and the input terminal TIN can be installed on the other side surface.

DESCRIPTION OF SYMBOLS 100 ... Sound processing system, 10 [n] (10 [1] -10 [N]) ... Signal processing apparatus, 11 ... Case, 12 ... Connection cable, 22 [n] (22 [1] -22 [N] ) ... Signal source, 24 [n] (24 [1] to 24 [N]) ... Sound emitting device, 42 ... Analog bus, 44 ... Resistance element (first resistance element), 46 ... First adjustment unit, 48 ... Second adjustment unit, 49R ... right adjustment unit, 49L ... left adjustment unit, 52 ... resistance element (second resistance element), 54 ... connection switching unit, 62 ... third adjustment unit, 622 ... positive phase adjustment unit, 623 ... Reverse phase generation unit, 624... Phase inversion unit, 626... Negative phase adjustment unit, 628... Variable resistor, 629.

Claims (9)

A plurality of signal processing devices that are separate from each other,
Each of the plurality of signal processing devices includes:
At least one connection terminal connected to a signal processing device other than the signal processing device among the plurality of signal processing devices;
An analog bus connected to the at least one connection terminal;
An input terminal connected to the analog bus for receiving an input of the first acoustic signal;
An output terminal connected to the analog bus and outputting a second acoustic signal to the sound emitting device ;
A third adjusting unit that adjusts a volume of an acoustic signal supplied to a path branched from a path between the input terminal and the analog bus, and that generates an acoustic signal having a phase opposite to that of the acoustic signal; A third adjustment unit including a generation unit;
An acoustic processing system, comprising: a signal addition unit that is arranged between the analog bus and the output terminal and adds an acoustic signal supplied from the analog bus and an acoustic signal adjusted by the third adjustment unit .   The reverse phase generator is
  A phase inverting unit for inverting the phase of the acoustic signal supplied to the branched path;
  A reverse phase adjusting unit that adjusts the volume of the acoustic signal after being inverted by the phase inverting unit.
  The sound processing system according to claim 1. At least one connection terminal connectable to another signal processing device that is separate from the device itself;
An analog bus connected to the at least one connection terminal;
An input terminal connected to the analog bus for receiving an input of the first acoustic signal;
An output terminal connected to the analog bus and outputting a second acoustic signal to the sound emitting device ;
A third adjusting unit that adjusts a volume of an acoustic signal supplied to a path branched from a path between the input terminal and the analog bus, and that generates an acoustic signal having a phase opposite to that of the acoustic signal; A third adjustment unit including a generation unit;
A signal processing apparatus, comprising: a signal addition unit that is disposed between the analog bus and the output terminal and adds an acoustic signal supplied from the analog bus and an acoustic signal adjusted by the third adjustment unit .   The reverse phase generator is
  A phase inverting unit for inverting the phase of the acoustic signal supplied to the branched path;
  A reverse phase adjusting unit that adjusts the volume of the acoustic signal after being inverted by the phase inverting unit.
  The signal processing apparatus according to claim 3. The signal processing device according to claim 3 , further comprising a plurality of the connection terminals connected to different signal processing devices. The signal processing apparatus according to claim 3 , further comprising a first resistance element disposed between the input terminal and the analog bus. The signal processing device according to claim 3 , further comprising: a first adjustment unit that is disposed between the input terminal and the analog bus and adjusts a volume of the first acoustic signal. Wherein arranged between the analog bus and said output terminal, claim from claim 3 comprising a second adjusting unit configured to generate the second acoustic signal by adjusting the volume of the sound signal supplied from the analog bus 7. The signal processing device according to any one of 7 . A second resistance element;
In the state where the other signal processing device is connected to the connection terminal, the second resistance element is insulated from the analog bus, while in the state where the other signal processing device is not connected to the connection terminal, The signal processing apparatus according to claim 3 , further comprising: a connection switching unit that connects a second resistance element to the analog bus.

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