JP4517395B2 - Electronic musical instruments - Google Patents

Description

  The present invention relates to an electronic musical instrument having at least two outputs of a speaker output and an AUX (auxiliary) output.

  2. Description of the Related Art Conventionally, an electronic musical instrument having three outputs, that is, a speaker output, a headphone output, and an AUX (auxiliary) output is known.

  FIG. 4 is a block diagram showing a partial configuration of such a conventional electronic musical instrument, specifically, a digital signal processing circuit 13 'and a sound system 14'.

  As shown in the figure, the digital musical tone signal generated by the sound source unit 13a in the digital signal processing circuit 13 'is input to a D / A (Digital-to-Analog) converter 14a in the sound system 14'. It is converted into an analog musical tone signal via the D / A converter 14a. The analog tone signal output from the D / A converter 14a is branched into two systems, one tone signal is input to the preamplifier 14b, and the other tone signal is an AUX-FIX (PRE) amplifier. 14k.

  The AUX-FIX (PRE) amplifier 14k amplifies the input musical sound signal with a predetermined gain, and then outputs it to the AUX-FIX (PRE) terminal 14l.

  The preamplifier 14b is provided with a volume 14c, and the user can change the gain of the preamplifier 14b using the volume 14c, that is, can variably control the volume level of the input analog musical sound signal.

  The output from the preamplifier 14b is branched into three systems, the first tone signal is input to the analog equalizer 14d, and the second tone signal is input to the headphone amplifier 14g. The musical tone signal is input to the AUX-VARI (POST) amplifier 14i.

  The analog equalizer 14d performs equalization on the input musical sound signal and outputs the equalized musical sound signal to the power amplifier 14e. The power amplifier 14e amplifies the equalized musical sound signal with a predetermined gain, and then outputs it to the speaker 14f.

  The headphone amplifier 14g amplifies the input musical sound signal with a predetermined gain (however, different from the gains of both the AUX-FIX (PRE) amplifier 14k and the power amplifier 14e), and then outputs it to the headphone terminal 14h.

  The AUX-VARI (POST) amplifier 14i also amplifies the input musical sound signal with a predetermined gain (however, different from the gains of the AUX-FIX (PRE) amplifier 14k, the power amplifier 14e, and the headphone amplifier 14g), Output to the AUX-VARI (POST) terminal 14j.

  Also, it is detected whether or not the signal input terminal (headphone plug) of the headphone is inserted into the headphone terminal (headphone jack), and the method of applying the digital effect to the digital musical sound signal is changed according to the detection result. An electronic musical instrument is also known (see, for example, Patent Document 1).

By combining these two types of conventional electronic musical instruments, the expensive analog equalizer 14d is omitted, and the equalization performed by the analog equalizer 14d is replaced with the digital equalizer originally provided in the digital signal processing circuit 13 ′. Specifically, when the headphone plug is inserted into the headphone jack, the parameters for headphones are set in the digital equalizer, while when the headphone plug is not inserted into the headphone jack, the parameters for the speakers (analog equalizer are set in the digital equalizer). An electronic musical instrument is easily conceived and realized by setting a parameter (which allows the digital equalizer to perform equalization similar to the equalization performed by 14d).
JP 2000-358294 A

  However, the combination of the above two types of conventional electronic musical instruments is effective when the output system of the musical sound signal is only two systems of the speaker output and the headphone output. When an output system is added, a D / A converter is required at least for each system of the two output systems of AUX, thereby increasing the manufacturing cost.

  The present invention has been made paying attention to this point, and it is an object of the present invention to provide an electronic musical instrument that can reduce the manufacturing cost while providing at least two outputs of a speaker output and an AUX output. To do.

In order to achieve the above object, an electronic musical instrument according to claim 1 generates a digital musical tone signal, and outputs the generated digital musical tone signal as at least first and second digital musical tone signals. An equalizer unit that performs equalization on the digital music signal of the first system output by the sound source unit, and a first output unit that outputs the digital music signal of the first system equalized by the equalizer unit; A volume control unit that performs volume control on a second digital music signal output by the sound source unit, and a second digital music signal that is volume-controlled by the volume control unit. A digital signal processing means comprising an output section of the digital signal processing apparatus, and a digital musical sound signal output from the first output section of the digital signal processing means for analog music processing. A first D / A converter for converting to a signal, and an analog volume control circuit for controlling the volume of an analog musical tone signal from the first D / A converter, comprising an operator for changing the volume level A second D / A converter for converting a digital musical tone signal output from the second output unit of the digital signal processing means into an analog musical tone signal, and a first mode and a second mode. A selection means for selecting one of the sound volume, and when the first mode is selected by the selection means, a volume value corresponding to the volume level set by the operation element is set in the volume control unit of the digital signal processing means On the other hand, when the second mode is selected by the selection unit, a predetermined volume value is set to the volume control of the digital signal processing unit regardless of the volume level set by the operator. It characterized by having a setting means for setting the.

To achieve the above object, an electronic musical instrument according to claim 2 generates a digital musical tone signal, and outputs the generated digital musical tone signal as at least first and second digital musical tone signals. An equalizer unit that performs equalization on the digital music signal of the first system output by the sound source unit, and a first output unit that outputs the digital music signal of the first system equalized by the equalizer unit; A volume control unit that performs volume control on a second digital music signal output by the sound source unit, and a second digital music signal that is volume-controlled by the volume control unit. A digital signal processing means comprising an output section of the digital signal processing apparatus, and a digital musical sound signal output from the first output section of the digital signal processing means for analog music processing. A first D / A converter for converting to a signal, and an analog volume control circuit for controlling the volume of an analog musical tone signal from the first D / A converter, comprising an operator for changing the volume level And a main output terminal that outputs an analog tone signal whose volume is controlled by the analog volume control circuit as a main output, and a headphone output terminal that outputs the analog tone signal whose volume is controlled by the analog volume control circuit as a headphone output And detecting means for detecting whether or not a headphone signal input terminal is inserted into the headphone output terminal, and detecting that the headphone signal input terminal is inserted into the headphone output terminal by the detecting means. Parameter setting for setting predetermined parameters in the equalizer section of the digital signal processing means. Means, a second D / A converter for converting the digital musical tone signal output from the second output section of the digital signal processing means into an analog musical tone signal, and any one of the first mode and the second mode. When the first mode is selected by the selection means, and a volume value corresponding to the volume level set by the operation element is set in the volume control unit of the digital signal processing means. On the other hand, when the second mode is selected by the selection unit, a predetermined volume value is set in the volume control unit of the digital signal processing unit regardless of the volume level set by the operator. Means.

According to the first aspect of the present invention, the equalization is performed on the musical tone signal to be output and the analog equalizer is deleted in the digital signal processing means, so that the manufacturing cost can be reduced. In addition, either the first mode or the second mode can be selected, and when the first mode is selected, a volume value corresponding to the volume level set by the operator is set to the digital signal processing means. While the volume control unit is set, when the second mode is selected, a predetermined volume value is set in the volume control unit of the digital signal processing means regardless of the volume level set by the operation element. The conventional two AUX terminals are replaced with one AUX terminal, and one of the musical sound signals output from the two conventional AUX terminals can be selected and output from one AUX terminal. Only one D / A converter needs to be added, which can reduce the manufacturing cost. Further, since the equalizer is digitized, the equalizing characteristic can be easily changed according to the setting of the user.

According to the second aspect of the present invention, in addition to the above-described effect produced by the first aspect of the invention, when the headphone signal input terminal is inserted into the headphone output terminal, the headphone tone signal is output from the headphone output terminal. Can be output.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of an electronic musical instrument according to an embodiment of the present invention.

  As shown in the figure, the electronic musical instrument of the present embodiment is provided on a performance operator 1 including a keyboard for inputting pitch information and an operation panel (not shown), and a plurality of pieces for inputting various information. A panel operator 2 including a switch and a numeric keypad, a detection circuit 3 for detecting an operation state of the performance operator 1, a detection circuit 4 for detecting an operation state of the panel operator 2, and a CPU 5 for controlling the entire apparatus. A ROM 6 for storing a control program executed by the CPU 5 and various table data, a RAM 7 for temporarily storing performance data, various input information, calculation results, and the like, and counting an interrupt time and various times in timer interrupt processing. Timer 8 to display various information, for example, a liquid crystal display (LCD) or a CRT (Cathode Ray Tube) display and a light emitting diode (LED) ), An external storage device 10 for storing various application programs including the control program, various music data, various data, etc., and a MIDI (Musical Instrument Digital Interface) message from the outside. A MIDI interface (I / F) 11 for outputting MIDI messages to the outside, and a communication interface for transmitting / receiving data to / from, for example, a server computer (hereinafter abbreviated as “server”) 102 via the communication network 101. (I / F) 12, a digital signal processing circuit 13 for converting performance data input from the performance operator 1, preset performance data, and the like into musical tone signals and applying various effects to the musical tone signals, A musical sound signal from the digital signal processing circuit 13 is converted into sound, for example, D / A Exchanger or amplifier is constituted by a sound system 14 such as a speaker.

  The above components 3 to 13 are connected to each other via a bus 15, a timer 8 and a sound system 14 are connected to the CPU 5, another MIDI device 100 is connected to the MID II / F 11, and the communication I / F 12 is connected to the communication I / F 12. Is connected to a communication network 101, and a sound system 14 is connected to the tone generator circuit 13. Here, the communication I / F 12 and the communication network 101 are not limited to the wired system but may be a wireless system. In addition, both types may be provided.

  The CPU 5 incorporates an A / D (Analog-to-Digital) converter (not shown) and, as will be described later with reference to FIG. 2, based on the digital value input from the A / D converter. The operation position of the volume 14c in the sound system 14 is detected.

  Examples of the external storage device 10 include a flexible disk drive (FDD), a hard disk drive (HDD), a CD-ROM drive, and a magneto-optical disk (MO) drive. As described above, the external storage device 10 can also store a control program to be executed by the CPU 5. If no control program is stored in the ROM 6, the control program is stored in the external storage device 10. By reading it into the RAM 7, it is possible to cause the CPU 5 to perform the same operation as when the control program is stored in the ROM 6. In this way, control programs can be easily added and upgraded.

  The MIDII / F11 is not limited to a dedicated one, and may be configured by a general-purpose interface such as RS-232C, USB (Universal Serial Bus), IEEE 1394 (Eye Triple E 1394). In this case, data other than MIDI messages may be transmitted and received simultaneously.

  As described above, the communication I / F 12 is connected to the communication network 101 such as a LAN (Local Area Network), the Internet, or a telephone line, and is connected to the server 102 via the communication network 101. When the above programs and various parameters are not stored in the external storage device 10, the communication I / F 12 is used to download programs and parameters from the server 102. The electronic musical instrument serving as a client transmits a command requesting download of a program and parameters to the server 102 via the communication I / F 12 and the communication network 101. Upon receiving this command, the server 102 distributes the requested program and parameters to the electronic musical instrument via the communication network 101, and the electronic musical instrument receives these programs and parameters via the communication I / F 12 and receives them externally. Downloading is completed by accumulating in the storage device 10.

  In the present embodiment, the digital signal processing circuit 13 is configured by a so-called sound source LSI (Large Scale Integrated Circuit), and includes not only a sound source function but also a function for imparting an acoustic effect, an equalizer function, a volume adjustment function, and the like. ing. Of course, the present invention is not limited to the sound source LSI, and may be constituted by a general-purpose processor such as a DSP (Digital Signal Processor) or a plurality of LSIs.

  The electronic musical instrument of the present embodiment takes the form of a keyboard musical instrument, but is not limited to this, and may be in the form of a stringed musical instrument type, a wind instrument type, a percussion instrument type, or the like.

FIG. 2 is a block diagram showing a detailed configuration of the digital signal processing circuit 13 and the sound system 14 included in the electronic musical instrument of FIG. 1. In FIG. 2, the same components as those in FIG. Has been. 2 also functions as a diagram for explaining the control processing executed by the electronic musical instrument of the present embodiment. FIG. 2 shows a configuration necessary for explaining the control processing, that is, a detection circuit. 4, CPU 5, ROM 6, and RAM 7 are also described. Further, in FIG. 2, the thick broken line shows a state of processing by software.

The digital signal processing circuit 13 and the sound system 14 in FIG. 2 are different from the conventional digital signal processing circuit 13 ′ and the sound system 14 ′ in FIG. 4 in the following points. That is,
(1) The conventional analog equalizer 14d in FIG. 4 is deleted, and the function of the analog equalizer 14d is replaced by the equalizer unit 13b1 in the digital signal processing circuit 13. (2) Two conventional AUX terminals in FIG. That is, the AUX-VARI (POST) terminal 14j and the AUX-FIX (PRE) terminal 14l are replaced with one AUX terminal 14o, and the musical sound output from the AUX-VARI (POST) terminal 14j or the AUX-FIX (PRE) terminal 14l. The point that any one of the signals can be selected and output from the AUX terminal 14o (3) Due to the difference in (1) above, the headphone signal input terminal (headphone plug) is inserted into the headphone terminal (headphone jack). (4) Due to the difference in (2) above, the volume of the digital music signal output from the AUX terminal 14o A volume control unit 13b2 for controlling the level is provided, and a D / A converter 14m for converting a digital musical tone signal from the volume control unit 13b2 into an analog musical tone signal is provided. (5) Due to the difference in (2) above. The operation position of the volume 14c is detected.

  As shown in FIG. 2, the digital signal processing circuit 13 includes at least two systems of outputs, one output is an output for the headphone terminal 14h, and the other is an output for the AUX terminal 14o. Each system includes D / A converters 14a and 14m, respectively. Note that, in this embodiment, the tone signal of each system is assumed to be a stereo tone signal, but is not limited to this, and may be a monaural tone signal.

  Further, an output of another system may be provided. As an example of the output of another system, there can be mentioned an output for generating a musical sound based on a musical sound signal to which a sound effect such as reverberation is given from another speaker.

  The volume 14c is composed of, for example, a plurality of operators fixed on one axis, and when the user rotates the axis, the plurality of operators are interlocked according to the rotation. One of the plurality of operators is used as a volume position detecting operator. For example, a variable resistor whose resistance value changes in conjunction with the volume position detecting operator is provided, and the voltage across the variable resistor is converted by an A / D converter built in the CPU 5, and after the conversion The operation position of the volume 14c can be detected by the CPU 5 calculating the digital value. The A / D converter is not limited to the one built in the CPU 5 but may be independent from the CPU 5 and connected to the bus 15.

  The headphone terminal 14h is provided with a sensor that detects whether or not a headphone signal input terminal (headphone plug) is inserted. This sensor may employ any detection method. For example, a mechanical contact system, an optical system, an electrical system, etc. can be considered. When a mechanical contact type sensor is employed, the contact is turned on / off as the headphone plug is inserted into / removed from the headphone terminal (headphone jack) 14h, and the ON / OFF state of the contact is detected via the detection circuit 4, for example. The CPU 5 may read it. In the present embodiment, the headphone terminal 14h is provided on or near the panel, and the headphone terminal 14h is provided with a function for reading the ON / OFF state of the contact in the detection circuit 4. This is because it is preferable to provide the detection circuit 4 closest to the position where is provided with a function of detecting the ON / OFF state of the contact. Of course, a detection circuit that detects only the ON / OFF state of the contact is provided independently of the detection circuit 4, and is connected to the bus 15, and the CPU 5 is read by the detection circuit 4 via the bus 15. The contact ON / OFF state may be read from the detection circuit 4.

  A control process executed by the electronic musical instrument configured as described above will be described in detail with reference to FIG.

  FIG. 3 is a flowchart showing a procedure of control processing executed by the electronic musical instrument of the present embodiment, particularly the CPU 5, and this control processing is an interrupt that is periodically activated every time the timer 8 times a predetermined time. It is part of the process.

In this control process, the following process is performed. That is,
(A) It is detected whether or not a headphone plug is inserted into the headphone jack, and a parameter corresponding to the detection result is written (set) in the equalizer unit 13b1. (B) EUX- A mode (hereinafter referred to as “VARI (POST) mode”) for outputting a musical sound signal similar to the musical sound signal output from the VARI (POST) terminal 14j, and the AUX-FIX (PRE) terminal in FIG. Of the modes (hereinafter referred to as “FIX (PRE) mode”) in which a musical tone signal similar to the musical tone signal output from 14l is output from the AUX terminal 14o, parameters corresponding to the selected AUX mode are set to the volume control unit 13b2. This is a volume control unit setting process to be written (set).

  Note that the electronic musical instrument of the present embodiment is configured such that either the VARI (POST) mode or the FIX (PRE) mode can be selected by a user panel operation, and the selected mode is the RAM 7. Are stored in a storage area secured at a predetermined position.

  In the equalizer setting process of (a), it is detected whether or not a headphone plug is inserted in the headphone jack (step S1). If the result of the detection is that the headphone plug is inserted in the headphone jack, the headphone output is output. Are read from the ROM 6 (step S2) and written to the equalizer unit 13b1 of the digital signal processing circuit 13 (step S4). On the other hand, when no headphone plug is inserted into the headphone jack, the parameters for speaker output are read from the ROM 6 (Step S3) and is written in the equalizer unit 13b1 of the digital signal processing circuit 13 (step S4). Thereby, the characteristic of the output signal to the speaker 14f and the characteristic of the output signal from the headphone terminal 14h are changed. Here, the headphone output parameter is assumed to be a parameter that causes the equalizer unit 13b1 to perform signal processing for outputting an output signal having a flat frequency characteristic from the headphone terminal 14h. It is only an example, and the equalizer unit 13b1 may be made to perform signal processing for outputting an output signal of a certain characteristic specialized for a certain headphone from the headphone terminal 14h. Further, depending on whether or not a headphone plug is inserted into the headphone jack, the digital signal processing circuit 13 controls the application of acoustic effects such as surround and sound image localization to the generated digital musical sound signal. It may be. Further, the speaker output parameter is used to correct the influence on the sound emission from the speaker due to the structure of the housing of the electronic musical instrument, and perform signal processing on the equalizer unit 13b1 so that the frequency characteristic becomes flat. The parameters are assumed to be

  Since the equalizer section 13b1 has been digitized, the musical tone signal can be more easily compared with the conventional analog equalizer (by a very simple method of simply writing the parameter value according to the target characteristic). It becomes possible to apply to.

  In the volume control unit setting process (b), when the selected AUX mode is the FIX (PRE) mode, the volume control unit 13b2 sets the volume level of the input musical sound signal to a fixed value (the operation position of the volume 14c). The parameter value (fixed value) for controlling to a fixed value (regardless of whether or not) is read from the ROM 6 (step S6) and written to the volume control unit 13b2 of the digital signal processing circuit 13 (step S8), while the selected AUX is selected. When the mode is the VARI (POST) mode, the volume control unit 13b2 sets the volume level of the input tone signal to a value corresponding to the operation position of the volume 14c (a value corresponding to the increase / decrease in the amplification factor of the preamplifier 14b). Parameter values for control are read from the ROM 6 (step S7) and written to the volume control unit 13b2 (step S8). Thereby, similarly to the speaker output and the headphone output, the volume of the AUX output can be increased or decreased.

  Note that the switches in FIG. 2 indicate processing in the VARI (POST) mode when in the ON state and processing in the FIX (PRE) mode when in the OFF state.

  In the present embodiment, various parameter values are read from the ROM 6, but the present invention is not limited to this, and values generated by calculation by the CPU 5 may be used.

  As described above, in this embodiment, the conventional analog equalizer is deleted, and the function of the analog equalizer is replaced by the equalizer unit 13b1 in the digital signal processing circuit 13, and the equalizer unit 13b1 is originally provided. Therefore, the manufacturing cost can be reduced.

  In addition, the conventional two AUX terminals are replaced with one AUX terminal 14o, and any one of the musical tone signals output from the two conventional AUX terminals can be selected and output from the AUX terminal 14o. Only one / A converter needs to be added, so that the manufacturing cost can be suppressed.

  If the volume control by the preamplifier 14b is also performed by the volume control function originally present in the digital signal processing circuit 13, and the volume control is not performed by the analog circuit called the preamplifier 14b, the manufacturing cost can be further reduced. However, this method is not desirable because the output from the D / A converter 14a is output at the maximum gain of the analog circuit in the subsequent stage, and the S / N ratio is greatly deteriorated.

It is a block diagram which shows schematic structure of the electronic musical instrument which concerns on one embodiment of this invention. It is a block diagram which shows the detailed structure of the digital musical tone signal circuit and sound system which are contained in the electronic musical instrument of FIG. It is a flowchart which shows the procedure of the control processing which the electronic musical instrument of FIG. 1, especially CPU performs. It is a block diagram which shows a part structure of the conventional electronic musical instrument, specifically, a digital musical tone signal circuit and a sound system.

Explanation of symbols

4 detection circuit (detection means), 5 CPU (setting means, selection means, detection means, parameter setting means, volume value setting means), 13 digital musical tone signal circuit (digital signal processing means), 14a D / A converter (first) 1 D / A converter), 14 b Preamplifier (analog volume control circuit), 14 c Volume (operator), 14 m D / A converter (second D / A converter)

Claims (2)

A digital musical tone signal is generated, and the generated digital musical tone signal is output as a digital musical tone signal of at least first and second systems, and a digital musical tone signal of the first system output by the tone generator unit An equalizer unit for performing equalization, a first output unit that outputs a digital music signal of the first system that is equalized by the equalizer unit, and a digital music signal of the second system that is output by the sound source unit. A digital signal processing means comprising: a volume control unit that performs volume control on the volume; and a second output unit that outputs a digital musical tone signal of a second system whose volume is controlled by the volume control unit;
A first D / A converter for converting a digital musical tone signal output from the first output unit of the digital signal processing means into an analog musical tone signal;
An analog volume control circuit for controlling the volume of an analog tone signal from the first D / A converter, comprising an operator for changing the volume level;
A second D / A converter for converting a digital musical tone signal output from the second output unit of the digital signal processing means into an analog musical tone signal;
Selecting means for selecting either the first mode or the second mode;
When the first mode is selected by the selection unit, a volume value corresponding to the volume level set by the operation element is set in the volume control unit of the digital signal processing unit, while the second mode is selected by the selection unit. And a setting unit that sets a predetermined volume value in the volume control unit of the digital signal processing unit regardless of the volume level set by the operator when the mode is selected. Musical instrument. A digital musical tone signal is generated, and the generated digital musical tone signal is output as a digital musical tone signal of at least first and second systems, and a digital musical tone signal of the first system output by the tone generator unit An equalizer unit for performing equalization, a first output unit that outputs a digital music signal of the first system that is equalized by the equalizer unit, and a digital music signal of the second system that is output by the sound source unit. A digital signal processing means comprising: a volume control unit that performs volume control on the volume; and a second output unit that outputs a digital musical tone signal of a second system whose volume is controlled by the volume control unit;
A first D / A converter for converting a digital musical tone signal output from the first output unit of the digital signal processing means into an analog musical tone signal;
An analog volume control circuit for controlling the volume of an analog tone signal from the first D / A converter, comprising an operator for changing the volume level;
A main output terminal for outputting an analog musical tone signal whose volume is controlled by the analog volume control circuit as a main output;
A headphone output terminal for outputting an analog musical sound signal whose volume is controlled by the analog volume control circuit as a headphone output;
Detecting means for detecting whether or not a headphone signal input terminal is inserted into the headphone output terminal;
Parameter setting means for setting a predetermined parameter in the equalizer section of the digital signal processing means when the detection means detects that a signal input terminal of a headphone is inserted into the headphone output terminal;
A second D / A converter for converting a digital musical tone signal output from the second output unit of the digital signal processing means into an analog musical tone signal;
Selecting means for selecting either the first mode or the second mode;
When the first mode is selected by the selection unit, a volume value corresponding to the volume level set by the operation element is set in the volume control unit of the digital signal processing unit, while the second mode is selected by the selection unit. And a volume value setting means for setting a predetermined volume value in the volume control unit of the digital signal processing means regardless of the volume level set by the operation element. Electronic musical instruments.

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