JP2013029852A - Electronic musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make sound transitions natural and ensure a sufficient number of simultaneously produced sounds even in the case that one of two sound production sources producing stereo sounds is attenuated when ensuring a sound production source to cope with new key on.SOLUTION: When a sound production source 40a assigned to the right channel side out of two sound production sources 40a producing stereo sounds is attenuated to cope with new key on, the sound production source 40a on the left channel side still outputs a musical sound waveform A after the change, and a left channel component L and a right channel component R are mixed in the musical sound waveform A after the change. Therefore, sounds including the left channel component L and the right channel component R are produced though the number of sound production sources 40a assigned for musical sound production is reduced from two to one.

Description

  The present invention relates to a musical sound generator for a stereo sampling electronic musical instrument and a waveform data storage device for storing waveform data of stereo-sampled musical sounds.

  In recent years, stereo sampling systems have been widely used in electronic pianos and the like. A stereo sampling type sound source records the sound produced as left and right stereo sound when the output of a sounding body such as a piano is large, or when expressing a realistic sound such as strings.

  Then, a musical sound generator for an electronic musical instrument that employs such a stereo sampling method samples and stores the recorded data of both channels as sound source data (waveform data), reads both data by key-on information, The sound of the original sound can be reproduced by reproducing the sound from the speaker. For this reason, an oscillator (digital control oscillator) of a stereo sampling type electronic musical instrument requires left and right oscillators to generate one sound, and the required number of oscillators with respect to the number of simultaneous sounds increases, and the price is very high. There was a problem of becoming expensive.

  On the other hand, in the case of the mono sampling method, although there are some problems in sound quality, since only one oscillator is required for stereo sampling, the required number of oscillators for the number of simultaneous sounds is half that of the stereo sampling method. There is also an advantage that can be done.

  As a sound characteristic, for example, in the case of a piano, the sound attenuates with time. Therefore, when the number of sounds that are pronounced is large, even if some sounds become monaural sounds, it is difficult to notice and there is little effect on music.

  Therefore, in the stereo sampling type electronic musical instrument as described above, when all the oscillators are sounded and a new key is pressed, a two-tone oscillator that has the least trouble with music (usually the oldest sound). It is considered to increase the number of simultaneous sounds by using the oscillator efficiently by assigning a free oscillator to a new sound and assigning a free sound to a new sound, thereby generating stereo sound. Reference 1). In this case, localization control and volume control are performed to balance the left and right volume.

Japanese Patent Laid-Open No. 10-49159 (page 4, FIG. 3)

  However, in the stereo sampling type electronic musical instrument as described above, in order to attenuate one of the two oscillators that produce stereo sound in order to cope with a new key-on, the component of one channel is muted and the other The output of only the channel component is output, and even if localization control or volume control is performed to balance the left and right volumes as described above, it is not possible to cover the silencing of one channel component and the transition of the sound is unnatural. There was a problem of becoming.

The present invention has been made in view of such a problem, and an object of the present invention is to provide one of two sound sources that perform stereo sound when securing a sound source in order to cope with a new key-on. Even when the sound is attenuated, the transition of the sound becomes natural, and a sufficient number of simultaneous sounds is ensured.

  The musical sound generating device for an electronic musical instrument according to claim 1 made to solve the above-mentioned problem is provided with a plurality of sound generation sources, and generates a musical sound corresponding to a key-on based on a musical sound waveform generated by the sound generation source. The sound source acquires waveform data of stereo-sampled sound in response to key-on, demodulates the acquired waveform data, and generates a sound waveform by performing localization control.

  The waveform data includes waveform data A on the channel A side which is one of the left and right channels and waveform data B on the channel B side which is the other of the left and right channels. Of these, the waveform data A is generated by mixing the positive phase component of the left channel component L and the positive phase component of the right channel component R of the stereo sampled sound at a predetermined ratio. On the other hand, the waveform data B is obtained by mixing the positive phase component of the left channel component L and the negative phase component of the right channel component R of the stereo sampled sound in the above ratio or the negative phase component of the left channel component L of the stereo sampled sound. And the right-phase component of the right channel component R are mixed at the above ratio.

  Further, the above-described musical sound waveform includes a musical sound waveform A on the channel A side and a musical sound waveform B on the channel B side. When a stereo sound is generated, two sound sources are assigned to the channel A side and the channel B side of the stereo sound, respectively, and the sound source assigned to the channel A side of the stereo sound outputs a musical sound waveform A. At the same time, the sound source assigned to the channel B side of the stereo sound outputs the musical sound waveform B. In this case, the sound source assigned to the channel A side of the stereo sound acquires waveform data A and waveform data B, adds the acquired waveform data A and waveform data B, and performs demodulation and localization control. The musical sound waveform A is generated by this. The sound source assigned to the stereo sound channel B side acquires waveform data A and waveform data B, and subtracts the waveform data B from the acquired waveform data A to perform demodulation and localization control. A musical sound waveform B is generated.

  On the other hand, when a monaural sound is generated, one sound source is assigned to the monaural sound, and the assigned sound source outputs a musical sound waveform A. In this case, the sound source assigned to the monaural sound acquires the waveform data A, demodulates the acquired waveform data A, and generates a sound waveform A by performing localization control.

  According to the musical sound generating device for an electronic musical instrument of the present invention configured as described above, for example, the sound source assigned to the channel B side among the two sound sources during stereo sounding is attenuated to cope with a new key-on. As a result, the tone generator A on the channel A side outputs the tone waveform A even after the change, and the tone waveform A after the change is mixed with the left channel component L and the right channel component R. A sound including the left channel component L and the right channel component R is generated even though the number of sound source sources assigned is reduced from two to one.

Therefore, even when one of the two sound sources during stereo sounding is attenuated in order to secure a sound source to be assigned to the musical sound corresponding to the key-on, the sound transition can be made natural. Further, by attenuating one of the two sound sources during stereo sound generation, it is possible to secure a sound source to cope with a new key-on, and to secure a sufficient number of simultaneous sounds. In addition, the localization control and volume control that was performed in the conventional configuration is no longer necessary, and the reaction time required from the key-on to the generation of the music is shortened, the response speed is improved, and the key-on music is reproduced more faithfully. be able to.

In this case, when the waveform data A is generated by mixing the positive phase component of the left channel component L and the positive phase component of the right channel component R of the stereo sampled sound at a predetermined ratio, the following is performed. On the other hand, the waveform data B is generated by mixing the normal phase component of the left channel component L and the reverse phase component of the right channel component R of the stereo sampled sound at the above ratio, while satisfying the relational expression (1). In the case where the following relational expression (2) is satisfied, and the negative phase component of the left channel component L and the positive phase component of the right channel component R of the stereo sampled sound are generated by mixing at the above ratio, It is conceivable that the relational expression (3) is satisfied (claim 2). However, W _A indicates waveform data A, and W _B indicates waveform data B. The coefficient k satisfies the following relational expression (4).

Relational expression (1): W _A = L / 2k + R / 2 (1-k)
Relational expression (2): W _B = L / 2k−R / 2 (1-k)
Relational expression (3): W _B = −L / 2k + R / 2 (1-k)
Relational expression (4): 0 <k <1

The coefficient k described above may satisfy the following relational expression (5) instead of the relational expression (4).

Relational expression (5): 0.25 ≦ k ≦ 0.75

In this way, the left and right volume balance can be kept within three times, and a more natural sound transition can be achieved.

  Further, the value of the coefficient k may be set for each sound generation source in accordance with the musical tone range that is keyed on. In this way, it is possible to more faithfully reproduce the key range of the musical tone that is keyed on.

  By the way, the volume of the left channel tends to increase when the pitch of the key-on tone is low, and the volume of the right channel tends to decrease when the pitch is high. Therefore, it is conceivable that the value of the coefficient k is set to be larger as the key range of the musical sound that is keyed on becomes lower, and the value of the coefficient k is set to be smaller as the frequency range of the keyed musical sound becomes higher. . In this way, it is possible to more faithfully reproduce the range of the key-on musical tone.

The coefficient k described above may satisfy the following relational expression (6) instead of the relational expression (4).

Relational expression (6): k = 0.5

In this way, after the sound source B is attenuated, there is an effect that the left and right outputs are equal and the left and right balance is good.

By the way, the following various methods are mentioned about the production | generation of the above-mentioned waveform data.
First, it is conceivable that the above-described waveform data is generated at the time of manufacture or the like and stored in advance in the musical sound generator of the electronic musical instrument. Specifically, as in claim 7, it is conceivable that a waveform data storage unit for storing waveform data is provided, and the sound source acquires waveform data from the waveform data storage unit in response to key-on.

In addition, it is conceivable that the above-described waveform data is generated in the musical tone generator of the electronic musical instrument in accordance with the setting contents such as when the player turns on the power or selects a timbre. Specifically, as in claim 8, further comprising a waveform data generation unit that generates waveform data, the waveform data generation unit generates waveform data according to the set contents, and the waveform data storage unit includes waveform data It is conceivable to store the waveform data generated by the generation unit.

  It is also conceivable to generate the above waveform data at key-on. Specifically, as in claim 9, a waveform data generation unit that generates waveform data is provided, the waveform data generation unit generates waveform data in response to key-on, and the sound source is waveform data in response to key-on. It is conceivable to acquire the waveform data generated by the generation unit.

  It is also conceivable that the waveform data described above is generated at the time of key-on and then temporarily stored, and the stored waveform data is read and used. Specifically, as in claim 10, further comprising a waveform data storage unit for storing waveform data, wherein the waveform data storage unit stores the waveform data generated by the waveform data generation unit in response to key-on, and generates a sound. It is conceivable that the source acquires the waveform data generated by the waveform data generation unit in response to the key-on from the waveform data storage unit.

By the way, as the sound source allocation method for the musical sound, for example, the following methods (a) to (e) are conceivable.
(A) When there are two or more sound sources that are not sounding when the key is turned on, two of the two or more sound sources that are not sounded are assigned to the musical sound generated as a stereo sound corresponding to the key-on. It is possible. Specifically, as in claim 11, when there are four or more sound sources, and there are two or more sound sources that are not sounded when the key is turned on, the musical sound corresponding to the key-on is stereo sound. Therefore, it is conceivable to include an allocating unit that allocates two of two or more sound sources that are not sounding to a musical sound generated as a stereo sound corresponding to a key-on.

In this way, it is possible to secure two sound sources that are not sounding and to reliably assign sound sources to the stereo sound.
(B) When there is one sound source that is not sounding and one or more sound source pairs that are sounded in stereo when the key is turned on, the assigning unit converts the musical sound corresponding to the key-on to stereo. Two sound sources that are not sounding are generated by attenuating the sound source assigned to the channel B side included in one of the sound source pairs that are sounding in stereo to produce a monaural sound. It is conceivable that two sound sources that are secured and not sounded are assigned to musical sounds generated as stereo sounds corresponding to key-on (claim 12).

  In this way, it is possible to secure two sound sources that are not sounding and to reliably assign sound sources to the stereo sound. Even if the stereo sound is a monaural sound, the transition of the sound can be made natural. In addition, the number of simultaneous pronunciations can be increased.

  (C) When there is no sound source that is not sounding and there are two or more sound sound source pairs that are sounded in stereo when the key is turned on, the assigning unit converts the musical sound corresponding to the key-on to a stereo sound. In order to generate two sound sources that are not sounding by attenuating the sound sources assigned to the channel B side included in two of the sound source pairs that are sounding in stereo, respectively, It is conceivable that two sound sources that are secured and not sounded are assigned to musical sounds generated as stereo sounds corresponding to key-on (claim 13).

In this way, it is possible to secure two sound sources that are not sounding and to reliably assign sound sources to the stereo sound. Even if the stereo sound is a monaural sound, the transition of the sound can be made natural. In addition, the number of simultaneous pronunciations can be increased.

  (D) When there is no sound source that is not sounding when a key is turned on and there is one sound source set that is sounding in stereo, the assigning unit sets the tone corresponding to the key-on as a monaural sound. In order to generate the sound source, the sound source assigned to the channel B side included in the sound source group that is currently sounding in stereo is attenuated to produce a monaural sound, thereby securing one sound source that is not sounding. It is conceivable that one sound source that is not sounding is assigned to a musical sound generated as a monaural sound corresponding to the key-on (claim 14).

  In this way, even in a situation where there are few sound sources that are not sounding, it is possible to generate a musical sound corresponding to a key-on as a monaural sound. Even if the stereo sound is a monaural sound, the transition of the sound can be made natural. In addition, the number of simultaneous pronunciations can be increased.

  (E) Also, when the key-on, there is no sound source that is not sounding, there is no sound source set that is sounding in stereo, and there is a sound source that is monaural sounding, the assigning unit In order to generate a sound corresponding to key-on as a monaural sound, one sound source that is not sounding is secured by attenuating one of the sound sources that are sounding monaural, and one sound that is not being sounded is secured It is conceivable that the source is assigned to a musical sound generated as a monaural sound corresponding to the key-on (claim 15).

  In this way, even in a situation where there are few sound sources that are not sounding, it is possible to generate a musical sound corresponding to a key-on as a monaural sound. In addition, the number of simultaneous pronunciations can be increased.

  The present invention can be realized as a waveform data storage device. Specifically, a waveform data storage device according to a sixteenth aspect stores the waveform data A and the waveform data B according to any one of the first to sixth aspects.

  According to the waveform data storage device of the present invention configured as described above, waveform data A and waveform data B are stored in the waveform data storage device, so that waveform data can be moved between the devices. In the waveform data A, the left channel component L and the right channel component R are mixed in the above ratio, and a sound including the left channel component L and the right channel component R is generated even with one sound source. Therefore, the waveform data storage device storing the waveform data described above can be shared with models that cannot produce stereo sound.

It is a block diagram showing schematic structure of an electronic keyboard instrument. 3 is an explanatory diagram illustrating a schematic configuration of a sound source circuit 40. FIG. It is a flowchart of a main process. It is a flowchart of an event process. It is a flowchart of a key pressing process. It is a flowchart of a reduction process. It is a flowchart of a key release process.

Embodiments of the present invention will be described below with reference to the drawings.
[First embodiment]
FIG. 1 is a block diagram showing a schematic configuration of the electronic keyboard instrument 1. FIG. 2 is an explanatory diagram showing a schematic configuration of the tone generator circuit 40.

[Description of the configuration of the electronic keyboard instrument 1]
As shown in FIG. 1, an electronic keyboard instrument 1 as a musical tone generator stores a keyboard 10, a panel SW / LCD 11, a pedal 12, a MIDI 15 that receives and outputs MIDI signals based on the MIDI standard, a CPU 30, and program data. A program / data memory (ROM) 31, a work RAM 32 for temporarily storing data by the CPU 30, an I / F 33, a waveform memory 42 storing various waveform data, and a waveform memory 42, read waveform data and generate a musical sound waveform. A tone generator circuit (TG) 40, a DSP 50 that processes and outputs a musical sound waveform generated by the tone generator circuit 40, a DAC 60 (R, L) that converts a digital signal into an analog signal, and an amplifier 70 (R, that amplifies the analog signal) L) and a speaker 80 (R, L) which is a sound emitting device. The keyboard 10, panel SW / LCD 11, pedal 12, and MIDI 15 are connected to the bus line 90 via the I / F 33, and the keyboard 10, panel SW / LCD 11, pedal 12, MIDI 15, CPU 30, program data memory 31, work RAM 32, tone generator circuit 40 and DSP 50 are connected to each other via a bus line 90 so as to be able to transmit and receive data. Note that the configuration of the pedal 12 and the MIDI 15 is in accordance with a publicly known technique, and therefore detailed description thereof is omitted here.

[Description of configuration of keyboard 10]
Of these, the keyboard 10 includes a plurality of keys (keys, 88 keys in the present embodiment) for selecting the pitch of the musical sound to be generated. A number (key code) is assigned to each musical tone of each pitch, and a musical tone having a desired pitch can be generated by designating a key code by pressing the key. Corresponding to each key, a key switch for detecting key press / release of the key is provided. This key switch has two contacts (a first contact and a second contact). The first contact is first turned on when the key is pressed, and the second contact is turned on when the key is further pressed. Has been. In the case of key release, the second contact and the first contact are turned off in the reverse order. Information indicating that these contacts are turned on or off is detected by the built-in scan circuit scanning each key switch, and is sent to the bus line 90 via the I / F 33 together with the key code. The key on / off information and the key code sent to the bus line are taken into the CPU 30 and the tone generator circuit 40, and stored in the work RAM 32 under the control of the CPU 30.

[Description of Configuration of Panel SW / LCD 11]
Further, the panel SW / LCD 11 is provided with a panel display device such as a liquid crystal display panel and LEDs, and a number of operators for inputting various information and commands to the electronic keyboard instrument 1. Among these, the panel display device turns on / off an LED for displaying the state of the electronic keyboard instrument 1 and the like in response to an instruction from the CPU 30. On the other hand, as an operator, for example, a mode selection switch for setting the electronic keyboard instrument 1 to AOC mode or AUTO mode (automatic accompaniment mode), or an automatic performance rhythm when the electronic keyboard instrument 1 is in the AUTO mode. START / STOP switch for starting and stopping accompaniment, tone switch for selecting tone, effect switch for selecting effect, reverb switch for selecting reverb, sound effect switch for selecting effect sound , A volume controller, a tap switch for setting the performance tempo, and the like are provided. The various switches, volume controller on / off, position, and the like are detected by a built-in panel scan. The switch information is sent from the panel scan to the bus line 90 via the I / F 33 and stored in the work RAM 32 under the control of the CPU 30.

[Description of configuration of RAM 32]
The RAM 32 is provided with a usage status memory 32a and a pronunciation number storage register 32b that are referred to when an allocation unit 30a of the CPU 30 described later allocates a sound source 40a of a sound source circuit 40 described later. Of these, the usage status memory 32a stores the sound source 40a that is being sounded in the order of the sound generation start time for each of the left and right stereo sounds and the monaural sound. The sound generation number storage register 32b is a register for storing the total number (N) of the sound generation source 40a, the number of sounds being generated in stereo (S), and the number of sounds being generated in monaural (M). Is changed, it is sequentially rewritten by the control unit 30b of the CPU 30 described later. The pronunciation number storage register 32b is referred to when the allocation unit 30a allocates the sound source 40a.

[Description of Configuration of CPU 30 and Program Data Memory 31]
Further, the CPU 30 operates according to the program data in the program / data memory 31 to control the operation of each part of the electronic keyboard instrument 1. The program data memory 31 stores, in addition to the above-described program data, data in which the timbre type, the reverb type, and the sound effect group type are associated with each other. In addition, as a kind of timbre, a concert ground etc. are mentioned, for example. Moreover, as a kind of reverb, hall reverb etc. are mentioned, for example. In addition, examples of the sound effect group include string resonance sound generated by the sound source circuit 40. Note that the data may include effects and effects of the DSP 50 such as an equalizer and a chorus.

  Note that the CPU 30 performs assignment control of the sound source 40a of the tone generator circuit 40 in accordance with the number of simultaneous sounds. Therefore, the CPU 30 is provided with an allocation unit 30a and a control unit 30b.

The assigning unit 30a performs control for assigning the sound generation source 40a to the newly keyed sound according to the number of simultaneous sounds of the stereo sound and monaural sound being sounded.
The control unit 30b writes and reads the usage status memory 32a and the pronunciation number storage register 32b, controls the sound source allocation function by the allocation unit 30a, controls the timing for sound generation / mute, etc. Take control.

  The CPU 30 has a waveform data generation unit 30c that generates waveform data. The waveform data includes waveform data A on the left channel side and waveform data B on the right channel side. In this embodiment, an example in which channel A, which is one of the left and right channels, corresponds to the left channel and channel B, which is the other of the left and right channels, corresponds to the right channel, and channel A corresponds to the right channel. Detailed description of an example in which channel B corresponds to the left channel will be omitted.

The waveform data generation unit 30c converts the positive phase component of the left channel component L and the positive phase component of the right channel component R of the tone sampled stereo using the following equation (1) to 1 / k: 1 / (1- The waveform data A mixed at the ratio of k) is generated, and the normal phase component of the left channel component L and the reverse phase component of the right channel component R of the stereo sound sampled using the following equation (2) are similarly used. Waveform data B mixed at a ratio of 1 / k: 1 / (1-k) is generated.

W _A = L / 2k + R / 2 (1-k) (1)
W _B = L / 2k−R / 2 (1-k) (2)

However, W _A indicates waveform data A, and W _B indicates waveform data B. Further, the coefficient k satisfies the following formula (3).

0 <k <1 Formula (3)

The level ratio, component ratio, and localization are as shown in the following (A) to (G) according to the value of the coefficient k based on the test results conducted by the applicant of the present application.

(A) When the coefficient k = 0.125, the level ratio is L: R = 1: 7, the component ratio is L: R = 7: 1, and the localization is considerably to the right.
(B) When the coefficient k = 0.250, the level ratio is L: R = 2: 6, the component ratio is L: R = 6: 2, the localization is rightward, and this is suitable for the high sound range.

(C) When the coefficient k = 0.375, the level ratio is L: R = 3: 5, the component ratio is L: R = 5: 3, and the localization is slightly to the right, which is suitable for the mid-high range.
(D) When the coefficient k = 0.500, the level ratio is L: R = 4: 4 (1: 1), the component ratio is L: R = 4: 4 (1: 1), and the localization is Centered and suitable for midrange.

(E) When the coefficient k = 0.625, the level ratio is L: R = 5: 3, the component ratio is L: R = 3: 5, and the localization is slightly leftward, which is suitable for the mid-low range.
(F) When the coefficient k = 0.750, the level ratio is L: R = 6: 2, the component ratio is L: R = 2: 6, the localization is to the left, which is suitable for the low sound range.

(G) When the coefficient k = 0.875, the level ratio is L: R = 7: 1, the component ratio is L: R = 1: 7, and the localization is considerably leftward.
Such waveform data is generated in advance when performance settings such as power-on or tone selection are performed at any time prior to sound generation, stored in the waveform memory 42, and a new key-on. Thus, when the musical sound is actually emitted, it is read from the waveform memory 42 by the sound source 40a and used. Alternatively, a device having the above-described waveform data generation function may be provided outside the machine, and only the waveform data generated by the machine may be stored in the waveform memory 42 when the machine is manufactured. Further, the waveform data generation unit 30c described above may generate the waveform data as described above when a new key is turned on, and the generated waveform data may be stored in the waveform memory 42. Further, the waveform data generated by the waveform data generation unit 30c at the time of a new key-on may be sent directly to the sound generation source 40a without going through the waveform memory 42.

[Description of Configuration of Sound Source Circuit 40 and Waveform Memory 42]
The tone generator circuit 40 is a Wave Table Look Up PCM waveform readout type capable of simultaneously producing, for example, 192 sounds, and has a function of generating a musical sound waveform. It also functions as an effect sound waveform generating means for generating an effect sound waveform. Specifically, the tone generator circuit 40 generates a musical tone waveform and an effect sound waveform based on waveform data read from a waveform memory 42 as a waveform data storage unit that stores various waveform data.

  More specifically, as shown in FIG. 2, the tone generator circuit 40 includes a sound source 40a that generates a musical sound waveform from waveform data, a left channel series adder 40e, and a right channel series adder 40f. The tone generator circuit 40 has 192 sound sources 40a, one left channel series adder 40e, and one right channel series adder 40f. In FIG. 2, two sound sources 40a, 1 are provided. Only one left channel series adder 40e and one right channel series adder 40f are shown, and the other configurations are not shown.

  Since the sound source circuit 40 has 192 sound sources 40a as described above, it can simultaneously generate a maximum of 96 stereo sounds for stereo sounds and a maximum of 192 monaural sounds for monaural sounds. It can occur at the same time.

Note that the musical sound waveforms generated by the sound source 40a include a musical sound waveform A on the left channel side and a musical sound waveform B on the right channel side. When a musical sound corresponding to key-on is generated as a stereo sound, two sound waves are generated. The sound source 40a is assigned to the channel A side and the channel B side of the stereo sound, and the sound source 40a assigned to the channel A side of the stereo sound outputs the musical sound waveform A and is assigned to the channel B side of the stereo sound. The generated sound source 40a outputs a musical sound waveform B. On the other hand, when a monaural sound is generated in response to a key-on, one sound source 40a is assigned to the monaural sound, and the assigned sound source 40a outputs a musical sound waveform A.

  Pronunciation source 40a includes a waveform data reading section 40b, and if the demodulation circuit 40c, has a localization control circuit 40d, which is assigned to the left channel side (b) stereo sound, the (b) Stereo sound A musical sound waveform is generated as follows for each of the cases assigned to the right channel side and (c) the case assigned to a monaural sound.

  (A) The sound source 40a when assigned to the left channel side of the stereo sound generates a musical sound waveform as follows. First, the waveform data reading unit 40 b reads the waveform data A from the waveform memory 42. Next, the demodulation circuit 40c demodulates by adding the waveform data A and the waveform data B. The waveform data A is read from the waveform memory 42 by the waveform data reading unit 40b of the sound source 40a assigned to the left channel side of the stereo sound, and the waveform data B is assigned to the right channel side of the stereo sound. The waveform data is read from the waveform memory 42 by the waveform data reading unit 40b of the sound source 40a. Further, the localization control circuit 40d multiplies the calculation result by the demodulation circuit 40c and the coefficient k to generate the musical sound waveform A. The coefficient k is the reciprocal of the value (1 / k) on the left channel side of the ratio (1 / k: 1 / (1-k)) used when generating the waveform data A. The musical sound waveform A generated in this way is output to the left channel series adder 40e.

  (B) The sound source 40a when assigned to the right channel side of the stereo sound generates a musical sound waveform as follows. First, the waveform data reading unit 40 b reads the waveform data B from the waveform memory 42. Next, the demodulation circuit 40c demodulates by subtracting the waveform data B from the waveform data A. The waveform data A is read from the waveform memory 42 by the waveform data reading unit 40b of the sound source 40a assigned to the left channel side of the stereo sound, and the waveform data B is assigned to the right channel side of the stereo sound. The waveform data is read from the waveform memory 42 by the waveform data reading unit 40b of the sound source 40a. Further, the localization control circuit 40d multiplies the calculation result by the demodulation circuit 40c and the coefficient (1-k) to generate a musical sound waveform B. The coefficient (1-k) is a value (1 / (1-k)) on the right channel side of the ratio (1 / k: 1 / (1-k)) used when generating the waveform data B. Is the reciprocal of The tone waveform B generated in this way is output to the right channel series adder 40f.

  (C) The sound source 40a when assigned to a monaural sound generates a musical sound waveform as follows. First, the waveform data reading unit 40 b reads the waveform data A from the waveform memory 42. Next, the demodulation circuit 40c outputs the waveform data A as it is. That is, the demodulation circuit 40c in this case simply operates as an output distributor. Further, the localization control circuit 40d multiplies the output result from the demodulation circuit 40c and the coefficient k to generate the musical sound waveform A. The coefficient k is the reciprocal of the value (1 / k) on the left channel side of the ratio (1 / k: 1 / (1-k)) used when generating the waveform data A. The musical sound waveform A generated in this way is output to the left channel series adder 40e.

  When the stereo sound is changed to monaural during sound generation, the sound source circuit 40 sets the output level of the sound source 40a on the right channel side among the sound source 40a of the left and right channels during the stereo sound to the numerical value “0”. ”And then control to switch the demodulation operation to the distribution operation.

  The left channel series adder 40e includes all musical sound waveforms A generated by all the sound source sources 40a assigned to the left channel side of the stereo sound being sounded, and all sound source sources 40a assigned to the monaural sound being sounded. All the musical sound waveforms A generated by are added and output to the DSP 50.

  The right channel series adder 40f adds all the musical sound waveforms B generated by all the sound source sources 40a assigned to the right channel side of the stereo sound being sounded, and outputs the result to the DSP 50.

  The tone generator circuit 40 includes an assignment memory (not shown). The assignment memory includes key assignment information (key code, on / off information thereof, on / off information of various switches, effect data). Etc.) are stored.

[Description of Configuration of DSP 50]
The DSP 50 is a digital signal processing device programmed to perform an effect applying process on the musical tone waveform and the effect sound waveform generated by the tone generator circuit 40. Further, the DSP 50 stores therein programs, effect data, reverb data, and the like. The DSP 50 is connected to a delay memory 52 capable of temporarily storing digital signals. The delay memory 52 can be used to provide effects such as delay, reverb, echo (delay), and chorus.

  The DSP 50 configured as described above receives an effect corresponding to the tone selected and set by the tone switch of the panel SW / LCD 11 when the musical tone waveform or the effect waveform generated by the tone generator 40 is input. Is added to the musical sound waveform generated by. Subsequently, the musical sound waveform to which the effect is applied and the effect sound waveform are added (hereinafter referred to as a composite waveform), and the reverb selected and set by the reverb switch of the panel SW / LCD 11 is applied to the composite waveform. To the DAC 60. When only the effect sound waveform is input, the effect sound waveform is output with reverb.

[Description of other configurations]
The DSP 50 is connected to a right output system consisting of a DAC 60R, Amp 70R and SP80R as well as a left output system consisting of a digital / analog converter (DAC) 60L, an amplifier (Amp) 70L and a speaker (SP) 80L. The output system converts the combined waveform (digital signal) output from the DSP 50 into an analog signal, amplifies it, and outputs the sound.

Since the other structure of the electronic keyboard instrument 1 is in accordance with a known technique, detailed description thereof is omitted here.
[Description of main processing]
Next, main processing executed by the CPU 30 of the electronic keyboard instrument 1 will be described with reference to the flowchart of FIG.

First, initialization is executed (S110). For example, each port of the CPU 30 is set, and a tone color in the RAM 32 is set.
Subsequently, it is determined whether there is an event such as a key operation or a switch operation (S120). If it is determined that there is an event (S120: YES), the event process (S130) is executed, the steady process (S140) is executed, and the process returns to S120. The event processing will be described later. Further, since the steady process is in accordance with a known technique, detailed description thereof is omitted here. On the other hand, if it is determined that there is no event (S120: NO)
), The steady process (S140) is executed without executing the event process (S130), and the process returns to S120.

[Explanation of event processing]
Next, event processing executed by the CPU 30 of the electronic keyboard instrument 1 will be described with reference to the flowchart of FIG. This event process is a subroutine of the main process described above, and is executed when the process proceeds to S130 of the main process.

  First, it is determined whether or not the event is a key depression (S310). If it is determined that the event is a key depression (S310: YES), a key depression process is executed (S340), and this subroutine is terminated. The key pressing process will be described later.

  On the other hand, if it is determined that the event is not a key press (S310: NO), it is determined whether the event is a key release (S320). If it is determined that the event is a key release (S320: YES), a key release process is executed (S350), and this subroutine is terminated. The key release process will be described later.

  On the other hand, when it is determined that the event is not a key release (S320: NO), it is determined whether or not the event is “other processing” (S330). If it is determined that the event is “other processing” (S330: YES), other processing is executed (S360), and this subroutine is terminated. Since “other processing” is in accordance with a known technique, a detailed description thereof is omitted here.

  On the other hand, if it is determined that the event is not “other processing” (S330: NO), error processing is executed (S370), and this subroutine is terminated. Since error processing is in accordance with a known technique, detailed description thereof is omitted here.

[Explanation of key press processing]
Next, a key pressing process executed by the CPU 30 of the electronic keyboard instrument 1 will be described with reference to the flowchart of FIG. This key pressing process is the above-described event processing subroutine, and is executed when the process proceeds to S340 of the event processing. In the following description, “the sound source 40a generates sound” is synonymous with the sound source 40a generating a musical sound waveform.

  First, a scanning process is executed (S410). In this scanning process, the 192 sound sources 40a included in the sound source circuit 40 are scanned, and the sound source 40a that has finished sounding or the sound source 40a that has been muffled most is scanned. As a scanning result, the sound source 40a being sounded is stored in the usage status memory 32a of the RAM 32 in order of the sound generation start time for each of the left and right stereo sounds and monaural sounds, and the total number (N) of the sound source 40a equipped, The number of sounds (S) and the number of sounds during monaural sound generation (M) are stored in the sound generation number storage register 32 b of the RAM 32.

  Subsequently, it is determined whether or not the value of the variable ctr is greater than or equal to the numerical value “N−1” (S420). The variable ctr indicates the number of the sound source 40a that is not sounding, and the constant N indicates the total number of equipment of the sound source 40a. If it is determined that the value of the variable ctr is greater than or equal to the numerical value “N−1”, that is, if the number of the sound source 40a not sounding is zero or one (S420: YES), the sound source not sounding A reduction process for increasing the quantity 40a and assigning a sound corresponding to a new key-on is executed (S430), and the process proceeds to S440. The reduction process will be described later. On the other hand, when it is determined that the value of the variable ctr is less than the numerical value “N−1” (S420: NO), it is not necessary to increase the quantity of the sound source 40a that is not sounding at this stage. The process proceeds to S440 without executing the reduction process.

  Subsequently, an allocation process is executed (S440). Specifically, when the process proceeds to S440 without executing the reduction process, the sound corresponding to the key-on is assigned as a stereo sound to the two sound generation sources 40a that are not generating sound, while the reduction process is executed. When the process proceeds to S440, the sound corresponding to the key-on is assigned to the sound source 40a that is not sounding according to the content determined by the reduction process.

Then, sound generation processing is executed (S450). Specifically, each sound source 40a is caused to sound the sound assigned in S440.
Further, since the quantity of the sound source 40a that is not sounding has been reduced by the above allocation process and sound generation process, the value of the variable ADD is added to the value of the variable ctr (S460), and this subroutine is terminated.

[Explanation of reduction processing]
Next, the reduction process executed by the CPU 30 of the electronic keyboard instrument 1 will be described with reference to the flowchart of FIG. This decrementing process is a subroutine for the key pressing process described above, and is executed when the process proceeds to S430 of the key pressing process.

  First, with reference to the stored contents of the pronunciation number storage register 32b, it is determined whether or not all the pronunciation sources 40a are producing a monaural sound (S505). If it is determined that all the sound sources 40a are sounding as monaural sound (S505: YES), the sound source that is sounding as a monaural sound is increased in order to increase the number of sound sources 40a that are not sounding by one. One of the sound sources 40a with the earliest sound generation start time is muted (S510), and the newly keyed musical sound is assigned as a monaural sound to the sound source 40a not sounding (S515), and the variable ADD is set. Is set to a numerical value “1” (S520), and this subroutine is terminated.

  On the other hand, not all the sound sources 40a are sounding as monaural sounds, that is, there is one sound source 40a that is not sounding, or all sound sources 40a are sounding but sound sources 40a that are sounding in stereo. If it is determined that there is one or more sets (S505: NO), it is determined whether or not there is an odd sound source 40a, that is, there is one sound source 40a that is not sounding (S525). If it is determined that there is one sound source 40a that is not sounding (S525: YES), in order to increase the number of sound sources 40a that are not sounding to two and secure a set of sound sources 40a, The sound source 40a with the earliest pronunciation start time among the sound sources 40a that are being sounded as a stereo sound is converted to monaural (S530), and the newly keyed musical sound is sent to the two sound sources 40a that are not sounded as stereo sound. (S535), the value of the variable ADD is set to a numerical value “2” (S540), and this subroutine is terminated.

  On the other hand, when it is determined that there is no sound source 40a that is not sounding, that is, all sound sources 40a are sounding but there are one or more sound sound sources 40a that are sounded as stereo sound (S525). : NO), it is determined whether or not there are two or more sets of sound generation sources 40a that are sounding as stereo sound (S545). If it is determined that there are two or more pairs of sound sources 40a that are sounding as stereo sounds (S545: YES), the sound sources that are sounding as stereo sounds are increased in order to increase the number of sound sources 40a that are not sounding by two. Of the sources 40a, the two sets of pronunciation sources 40a with the earliest pronunciation start time are monauralized (S550), and the newly keyed musical sound is assigned as stereo sound to the two pronunciation sources 40a that are not in the reserved pronunciation. (S555), the value of the variable ADD is set to a numerical value “2” (S560), and this subroutine is terminated.

On the other hand, when it is determined that there is only one set of sound source 40a that is sounding as a stereo sound (S545: NO), sound is generated as the stereo sound in order to increase the number of sound sources 40a that are not sounding by one. The sound source 40a in the middle is converted to monaural (S565), and the newly keyed musical sound is assigned as a monaural sound to one sounding source 40a that is not currently sounding (S515), and the value of the variable ADD is set to a numerical value “1” ( (S575) This subroutine is terminated.

[Explanation of key release processing]
Next, a key release process executed by the CPU 30 of the electronic keyboard instrument 1 will be described with reference to a flowchart of FIG. This key release processing is the event processing subroutine described above, and is executed when the process proceeds to S350 of the event processing.

First, search processing is executed (S610). Specifically, the pronunciation source 40a that no longer needs to be pronounced by the key release event is searched.
Subsequently, a mute process is executed for the sound source 40a searched in S610 (S620). At this time, a variable SUB is set. Note that the variable SUB is a variable indicating the type of sound generation, and is set to a numerical value “1” when the tone to be released is a monaural tone, while the tone to be released is a stereo tone. In some cases, the value is set to “2”.

Further, the value of the variable ctr is subtracted by the value of the variable SUB (S630).
Then, this subroutine ends.
[Effect of the first embodiment]
(1) As described above, according to the electronic keyboard instrument 1 of the first embodiment, for example, the sound source 40a assigned to the right channel side among the two sound sources 40a during stereo sounding to cope with a new key-on. When the sound source 40a on the left channel side is attenuated, the tone waveform A is output after the change, and the tone waveform A after the change is mixed with the left channel component L and the right channel component R, The sound including the left channel component L and the right channel component R is generated even though the number of the sound generation sources 40a allocated to the generation of the musical sound is decreased from two to one.

  Therefore, even when one of the two sound sources 40a during stereo sounding is attenuated in order to secure the sound source 40a assigned to the musical sound corresponding to the key-on, the sound transition can be made natural. Further, by attenuating one of the two sound sources 40a during stereo sound generation, the sound source 40a can be secured to cope with a new key-on, and a sufficient number of simultaneous sounds can be secured. In addition, the localization control and volume control that was performed in the conventional configuration is no longer necessary, and the reaction time required from the key-on to the generation of the music is shortened, the response speed is improved, and the key-on music is reproduced more faithfully. be able to.

  (2) Also, according to the electronic keyboard instrument 1 of the first embodiment, when there are two or more sound sources that are not sounding when the key is turned on (S420: NO), the musical sound corresponding to the key-on is stereo sound. Therefore, two of the two or more sound sources that are not sounding are assigned to the musical sound generated as a stereo sound corresponding to the key-on (S440). As a result, two sound sources 40a that are not sounding can be secured and the sound sources 40a can be reliably assigned to stereo sounds.

(3) Also, according to the electronic keyboard instrument 1 of the first embodiment, when the key is turned on, there is one sound source that is not sounding, and there is one or more sound source sets that are sounding in stereo. Sometimes (S525: YES), the sound source 40a assigned to the right channel side included in one of the groups of sound sources 40a during stereo sounding is attenuated in order to generate a musical sound corresponding to key-on as a stereo sound. The two sound sources 40a that are not sounding are secured by making them into monaural sounds (S530), and the two sound sources 40a that are not sounded are allocated to musical sounds generated as stereo sounds corresponding to key-on (S535). , S440).

  As a result, two sound sources 40a that are not sounding can be secured and the sound sources 40a can be reliably assigned to stereo sounds. Even if the stereo sound is a monaural sound, the transition of the sound can be made natural. In addition, the number of simultaneous pronunciations can be increased.

  (4) According to the electronic keyboard instrument 1 of the first embodiment, when the key is turned on, there is no sound source 40a that is not sounding, and there are two or more pairs of sound sources 40a that are sounding in stereo. When generating (S545: YES), in order to generate a musical sound corresponding to key-on as a stereo sound, the sound source 40a assigned to the right channel side included in two of the sound source sources 40a in the stereo sound generation is selected. The two sound sources 40a that are not sounding are secured by attenuating each to make a monaural sound, and the two sound sources 40a that are not sounded are assigned to musical sounds generated as stereo sounds corresponding to key-on (S555, S440).

  As a result, two sound sources 40a that are not sounding can be secured and the sound sources 40a can be reliably assigned to stereo sounds. Even if the stereo sound is a monaural sound, the transition of the sound can be made natural. In addition, the number of simultaneous pronunciations can be increased.

  (5) Also, according to the electronic keyboard instrument 1 of the first embodiment, when the key is turned on, there is no sound source 40a that is not sounding and there is one set of sound sources 40a that are sounding in stereo. Sometimes (S545: NO), in order to generate a musical sound corresponding to the key-on as a monaural sound, the sound source 40a assigned to the right channel side included in the set of sound sources 40a during the stereo sounding is attenuated to produce a monaural sound. Thus, one sound source 40a that is not sounding is secured, and one sound source 40a that is not sounded is assigned to a musical sound generated as a monaural sound corresponding to the key-on (S570, S440).

  As a result, even in a situation where there are few sound sources 40a that are not sounding, it is possible to generate a musical sound corresponding to key-on as a monaural sound. Even if the stereo sound is a monaural sound, the transition of the sound can be made natural. In addition, the number of simultaneous pronunciations can be increased.

  (6) According to the electronic keyboard instrument 1 of the first embodiment, when the key is turned on, there is no sound source 40a that is not sounding, no sound source 40a pair that is sounding in stereo is present, and When there is a sound source 40a during monaural sound generation, that is, when all sound source sources are assigned to monaural sounds (S505: NO), in order to generate a musical sound corresponding to key-on as a monaural sound, One sound source 40a that is not sounding is secured by attenuating one of the sound source 40a, and the sound source 40a that is not sounding is secured as a musical sound that is generated as a monaural sound corresponding to the key-on. Assign (S515, S440).

  In this way, even in a situation where there are few sound sources 40a that are not being sounded, it is possible to generate a musical sound corresponding to key-on as a monaural sound. In addition, the number of simultaneous pronunciations can be increased.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, It is possible to implement in the following various aspects.

  (1) In the above embodiment, the coefficient k is assumed to satisfy the expression (3), but is not limited to this, and (A) coefficient k = 0.125 as described in (A) and (G) above. In the case of (4), the localization is considerably leftward. (G) Considering that the localization is considerably leftward when the coefficient k = 0.875, the coefficient k may satisfy the following relational expression (4). Good.

0.25 ≦ k ≦ 0.75 Formula (4)
Thus, the unnaturalness can be further eliminated by keeping the left and right volume balance within three times.

(2) The coefficient k may satisfy the following expression (5).
k = 0.5 (5)
In this way, even when one sound source 40a of the set of sound sources 40a is attenuated in order to make the stereo sound into monaural, there is an effect that the left and right outputs are equal and the right and left balance is good. .

  (3) The value of the coefficient k may be set for each sound generation source 40a in accordance with the range of the newly keyed musical sound. As an example, the value of the coefficient k is set to be larger as the range of the newly keyed musical sound becomes lower, while the value of the coefficient k is set to be smaller as the range of the newly keyed musical sound becomes higher. And so on. In this way, it is possible to faithfully reproduce the range of the key-on musical tone.

(4) In the above embodiment, the waveform data generation unit 30c converts the positive phase component of the left channel component L and the positive phase component of the right channel component R of the musical sound stereo-sampled using the above equation (1) to 1 / Waveform data A mixed at a ratio of k: 1 / (1-k) is generated, and the normal phase component of the left channel component L and the inverse of the right channel component R of the tone sampled using the above formula (2) Similarly, the waveform data B is generated by mixing the phase components at a ratio of 1 / k: 1 / (1-k). However, the waveform data B is not limited to this, and the waveform data generation unit 30c performs the following processing. The opposite phase component of the left channel component L and the right phase component of the right channel component R of the tone sampled in stereo using the equation (6) are similarly mixed at a ratio of 1 / k: 1 / (1-k). To generate There.

W _B = −L / 2k + R / 2 (1-k) (6)

Even if comprised in this way, there exists an effect similar to the said embodiment.

  (5) Further, the waveform data as described above is stored in a waveform data storage device such as a USB memory device, and the waveform data storage device is connected to the electronic keyboard instrument 1 and used as necessary. Also good. In this way, by storing the waveform data A and the waveform data B in the waveform data storage device, the waveform data can be moved between the devices. In the waveform data A, the left channel component L and the right channel component R are mixed in the above ratio, and a sound including the left channel component L and the right channel component R is generated even in one sound source 40a. Therefore, the waveform data storage device storing the waveform data described above can be shared with models that cannot produce stereo sound.

DESCRIPTION OF SYMBOLS 1 ... Electronic keyboard instrument, 10 ... Keyboard, 11 ... Panel SW / LED, 12 ... Pedal, 15 ... MIDI, 30 ... CPU, 30a ... Assignment part, 30b ... Control part, 30c ... Waveform data generation part, 31 ... Program Data memory, 32 ... work RAM, 32a ... usage status memory, 32b
... Sound generation number register 33 ... I / F, 40 ... Sound source circuit, 40a ... Sound generation source, 40b ... Waveform data reading unit, 40c ... Demodulation circuit, 40d ... Localization control circuit, 40e ... Left channel series adder, 40f ... Right channel series adder, 42 ... waveform memory, 50 ... DSP, 52 ... delay memory, 60 ... DAC, 70 ... amplifier, 80 ... speaker, 90 ... bus line

The present invention relates to an electronic musical instrument stereo sampling method.

  In recent years, stereo sampling systems have been widely used in electronic pianos and the like. A stereo sampling type sound source records the sound produced as left and right stereo sound when the output of a sounding body such as a piano is large, or when expressing a realistic sound such as strings.

  Then, a musical sound generator for an electronic musical instrument that employs such a stereo sampling method samples and stores the recorded data of both channels as sound source data (waveform data), reads both data by key-on information, The sound of the original sound can be reproduced by reproducing the sound from the speaker. For this reason, an oscillator (digital control oscillator) of a stereo sampling type electronic musical instrument requires left and right oscillators to generate one sound, and the required number of oscillators with respect to the number of simultaneous sounds increases, and the price is very high. There was a problem of becoming expensive.

  On the other hand, in the case of the mono sampling method, although there are some problems in sound quality, since only one oscillator is required for stereo sampling, the required number of oscillators for the number of simultaneous sounds is half that of the stereo sampling method. There is also an advantage that can be done.

  As a sound characteristic, for example, in the case of a piano, the sound attenuates with time. Therefore, when the number of sounds that are pronounced is large, even if some sounds become monaural sounds, it is difficult to notice and there is little effect on music.

  Therefore, in the stereo sampling type electronic musical instrument as described above, when all the oscillators are sounded and a new key is pressed, a two-tone oscillator that has the least trouble with music (usually the oldest sound). It is considered to increase the number of simultaneous sounds by using the oscillator efficiently by assigning a free oscillator to a new sound and assigning a free sound to a new sound, thereby generating stereo sound. Reference 1). In this case, localization control and volume control are performed to balance the left and right volume.

Japanese Patent Laid-Open No. 10-49159 (page 4, FIG. 3)

  However, in the stereo sampling type electronic musical instrument as described above, in order to attenuate one of the two oscillators that produce stereo sound in order to cope with a new key-on, the component of one channel is muted and the other The output of only the channel component is output, and even if localization control or volume control is performed to balance the left and right volumes as described above, it is not possible to cover the silencing of one channel component and the transition of the sound is unnatural. There was a problem of becoming.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide one of two sound sources that perform stereo sound when securing a sound source in order to cope with a new key-on. Even when the sound is attenuated, the transition of the sound becomes natural, and a sufficient number of simultaneous sounds is ensured.

Electronic musical instrument according to claim 1 which has been made to solve the above problem is to retain the tone taken in stereo as the waveform data, a set of a plurality of sound generating means Pronunciation waveform data in response to key depression In the electronic musical instrument that is assigned to the sound channel and is generated on the stereo channel, the waveform data includes a positive phase addition component (hereinafter referred to as a positive phase component) of a predetermined ratio of both the left and right of the musical sound collected in the stereo, and one positive phase and the other. When the total number of sounds produced by the key depression is less than a predetermined number, the sum of the normal phase component and the reverse phase component is calculated from one of the stereo channels. The difference between the positive phase component and the negative phase component is reproduced from the other stereo channel, and if the total number of keystrokes is greater than or equal to a predetermined number, the normal phase component is Characterized in that to both.

  Therefore, even when one of the two sound sources during stereo sounding is attenuated in order to secure a sound source to be assigned to the musical sound corresponding to the key-on, the sound transition can be made natural. Further, by attenuating one of the two sound sources during stereo sound generation, it is possible to secure a sound source to cope with a new key-on, and to secure a sufficient number of simultaneous sounds. In addition, the localization control and volume control that was performed in the conventional configuration is no longer necessary, and the reaction time required from the key-on to the generation of the music is shortened, the response speed is improved, and the key-on music is reproduced more faithfully. be able to.

In this case, the ratio at the time of addition of the positive phase component is 1 / k according to the following relational expression (1), and the ratio at the time of addition of the negative phase component is 1 / (1- k), and it is conceivable to multiply the multiplication coefficient k when reproducing the sum and to multiply the multiplication coefficient (1-k) when reproducing the difference.

Relational expression (1) : 0 <k <1

Note that the coefficient k of the above, the following relational expression (2) may be as satisfying (claim 3) instead of the equation (1).

Relational expression (2) : 0.25 ≦ k ≦ 0.75

In this way, the left and right volume balance can be kept within three times, and a more natural sound transition can be achieved.

As for the coefficient k described above, it may be as to satisfy the following relationship (3) instead of the equation (1) (claim 4).

Relational expression (3) : k = 0.5

In this way, after the sound source B is attenuated, there is an effect that the left and right outputs are equal and the left and right balance is good.

By the way, as for the method of assigning the sound source to the musical sound, as in claim 5, the total number of sound generation by the key depression is imminent to the number of pairs of the sound generation means, and the sound generation by the new key depression cannot be performed in stereo. In this case, among the sounding means that are sounding in the stereo, the sound generation of the difference component of the selected set is stopped, and a new set is selected by the sounding means including the sounding means for which the sounding is stopped, It is conceivable to assign a pronunciation by pressing a key.

It is a block diagram showing schematic structure of an electronic keyboard instrument. 3 is an explanatory diagram illustrating a schematic configuration of a sound source circuit 40. FIG. It is a flowchart of a main process. It is a flowchart of an event process. It is a flowchart of a key pressing process. It is a flowchart of a reduction process. It is a flowchart of a key release process.

Embodiments of the present invention will be described below with reference to the drawings.
[First embodiment]
FIG. 1 is a block diagram showing a schematic configuration of the electronic keyboard instrument 1. FIG. 2 is an explanatory diagram showing a schematic configuration of the tone generator circuit 40.

[Description of the configuration of the electronic keyboard instrument 1]
As shown in FIG. 1, an electronic keyboard instrument 1 as a musical tone generator stores a keyboard 10, a panel SW / LCD 11, a pedal 12, a MIDI 15 that receives and outputs MIDI signals based on the MIDI standard, a CPU 30, and program data. A program / data memory (ROM) 31, a work RAM 32 for temporarily storing data by the CPU 30, an I / F 33, a waveform memory 42 storing various waveform data, and a waveform memory 42, read waveform data and generate a musical sound waveform. A tone generator circuit (TG) 40, a DSP 50 that processes and outputs a musical sound waveform generated by the tone generator circuit 40, a DAC 60 (R, L) that converts a digital signal into an analog signal, and an amplifier 70 (R, that amplifies the analog signal) L) and a speaker 80 (R, L) which is a sound emitting device. The keyboard 10, panel SW / LCD 11, pedal 12, and MIDI 15 are connected to the bus line 90 via the I / F 33, and the keyboard 10, panel SW / LCD 11, pedal 12, MIDI 15, CPU 30, program data memory 31, work RAM 32, tone generator circuit 40 and DSP 50 are connected to each other via a bus line 90 so as to be able to transmit and receive data. Note that the configuration of the pedal 12 and the MIDI 15 is in accordance with a publicly known technique, and therefore detailed description thereof is omitted here.

[Description of configuration of keyboard 10]
Of these, the keyboard 10 includes a plurality of keys (keys, 88 keys in the present embodiment) for selecting the pitch of the musical sound to be generated. A number (key code) is assigned to each musical tone of each pitch, and a musical tone having a desired pitch can be generated by designating a key code by pressing the key. Corresponding to each key, a key switch for detecting key press / release of the key is provided. This key switch has two contacts (a first contact and a second contact). The first contact is first turned on when the key is pressed, and the second contact is turned on when the key is further pressed. Has been. In the case of key release, the second contact and the first contact are turned off in the reverse order. Information indicating that these contacts are turned on or off is detected by the built-in scan circuit scanning each key switch, and is sent to the bus line 90 via the I / F 33 together with the key code. The key on / off information and the key code sent to the bus line are taken into the CPU 30 and the tone generator circuit 40, and stored in the work RAM 32 under the control of the CPU 30.

[Description of Configuration of Panel SW / LCD 11]
Further, the panel SW / LCD 11 is provided with a panel display device such as a liquid crystal display panel and LEDs, and a number of operators for inputting various information and commands to the electronic keyboard instrument 1. Among these, the panel display device turns on / off an LED for displaying the state of the electronic keyboard instrument 1 and the like in response to an instruction from the CPU 30. On the other hand, as an operator, for example, a mode selection switch for setting the electronic keyboard instrument 1 to AOC mode or AUTO mode (automatic accompaniment mode), or an automatic performance rhythm when the electronic keyboard instrument 1 is in the AUTO mode. START / STOP switch for starting and stopping accompaniment, tone switch for selecting tone, effect switch for selecting effect, reverb switch for selecting reverb, sound effect switch for selecting effect sound , A volume controller, a tap switch for setting the performance tempo, and the like are provided. The various switches, volume controller on / off, position, and the like are detected by a built-in panel scan. The switch information is sent from the panel scan to the bus line 90 via the I / F 33 and stored in the work RAM 32 under the control of the CPU 30.

[Description of configuration of RAM 32]
The RAM 32 is provided with a usage status memory 32a and a pronunciation number storage register 32b that are referred to when an allocation unit 30a of the CPU 30 described later allocates a sound source 40a of a sound source circuit 40 described later. Of these, the usage status memory 32a stores the sound source 40a that is being sounded in the order of the sound generation start time for each of the left and right stereo sounds and the monaural sound. The sound generation number storage register 32b is a register for storing the total number (N) of the sound generation source 40a, the number of sounds being generated in stereo (S), and the number of sounds being generated in monaural (M). Is changed, it is sequentially rewritten by the control unit 30b of the CPU 30 described later. The pronunciation number storage register 32b is referred to when the allocation unit 30a allocates the sound source 40a.

[Description of Configuration of CPU 30 and Program Data Memory 31]
Further, the CPU 30 operates according to the program data in the program / data memory 31 to control the operation of each part of the electronic keyboard instrument 1. The program data memory 31 stores, in addition to the above-described program data, data in which the timbre type, the reverb type, and the sound effect group type are associated with each other. In addition, as a kind of timbre, a concert ground etc. are mentioned, for example. Moreover, as a kind of reverb, hall reverb etc. are mentioned, for example. In addition, examples of the sound effect group include string resonance sound generated by the sound source circuit 40. Note that the data may include effects and effects of the DSP 50 such as an equalizer and a chorus.

  Note that the CPU 30 performs assignment control of the sound source 40a of the tone generator circuit 40 in accordance with the number of simultaneous sounds. Therefore, the CPU 30 is provided with an allocation unit 30a and a control unit 30b.

The assigning unit 30a performs control for assigning the sound generation source 40a to the newly keyed sound according to the number of simultaneous sounds of the stereo sound and monaural sound being sounded.
The control unit 30b writes and reads the usage status memory 32a and the pronunciation number storage register 32b, controls the sound source allocation function by the allocation unit 30a, controls the timing for sound generation / mute, etc. Take control.

  The CPU 30 has a waveform data generation unit 30c that generates waveform data. The waveform data includes waveform data A on the left channel side and waveform data B on the right channel side. In this embodiment, an example in which channel A, which is one of the left and right channels, corresponds to the left channel and channel B, which is the other of the left and right channels, corresponds to the right channel, and channel A corresponds to the right channel. Detailed description of an example in which channel B corresponds to the left channel will be omitted.

The waveform data generation unit 30c converts the positive phase component of the left channel component L and the positive phase component of the right channel component R of the tone sampled stereo using the following equation (1) to 1 / k: 1 / (1- The waveform data A mixed at the ratio of k) is generated, and the normal phase component of the left channel component L and the reverse phase component of the right channel component R of the stereo sound sampled using the following equation (2) are similarly used. Waveform data B mixed at a ratio of 1 / k: 1 / (1-k) is generated.

WA = L / 2k + R / 2 (1-k) (1)
WB = L / 2k−R / 2 (1-k) (2)

However, WA indicates waveform data A and WB indicates waveform data B. Further, the coefficient k satisfies the following formula (3).

0 <k <1 Formula (3)

The level ratio, component ratio, and localization are as shown in the following (A) to (G) according to the value of the coefficient k based on the test results conducted by the applicant of the present application.

(A) When the coefficient k = 0.125, the level ratio is L: R = 1: 7, the component ratio is L: R = 7: 1, and the localization is considerably to the right.
(B) When the coefficient k = 0.250, the level ratio is L: R = 2: 6, the component ratio is L: R = 6: 2, the localization is rightward, and this is suitable for the high sound range.

(C) When the coefficient k = 0.375, the level ratio is L: R = 3: 5, the component ratio is L: R = 5: 3, and the localization is slightly to the right, which is suitable for the mid-high range.
(D) When the coefficient k = 0.500, the level ratio is L: R = 4: 4 (1: 1), the component ratio is L: R = 4: 4 (1: 1), and the localization is Centered and suitable for midrange.

(E) When the coefficient k = 0.625, the level ratio is L: R = 5: 3, the component ratio is L: R = 3: 5, and the localization is slightly leftward, which is suitable for the mid-low range.
(F) When the coefficient k = 0.750, the level ratio is L: R = 6: 2, the component ratio is L: R = 2: 6, the localization is to the left, which is suitable for the low sound range.

(G) When the coefficient k = 0.875, the level ratio is L: R = 7: 1, the component ratio is L: R = 1: 7, and the localization is considerably leftward.
Such waveform data is generated in advance when performance settings such as power-on or tone selection are performed at any time prior to sound generation, stored in the waveform memory 42, and a new key-on. Thus, when the musical sound is actually emitted, it is read from the waveform memory 42 by the sound source 40a and used. Alternatively, a device having the above-described waveform data generation function may be provided outside the machine, and only the waveform data generated by the machine may be stored in the waveform memory 42 when the machine is manufactured. Further, the waveform data generation unit 30c described above may generate the waveform data as described above when a new key is turned on, and the generated waveform data may be stored in the waveform memory 42. Further, the waveform data generated by the waveform data generation unit 30c at the time of a new key-on may be sent directly to the sound generation source 40a without going through the waveform memory 42.

[Description of Configuration of Sound Source Circuit 40 and Waveform Memory 42]
The tone generator circuit 40 is a Wave Table Look Up PCM waveform readout type capable of simultaneously producing, for example, 192 sounds, and has a function of generating a musical sound waveform. It also functions as an effect sound waveform generating means for generating an effect sound waveform. Specifically, the tone generator circuit 40 generates a musical tone waveform and an effect sound waveform based on waveform data read from a waveform memory 42 as a waveform data storage unit that stores various waveform data.

  More specifically, as shown in FIG. 2, the tone generator circuit 40 includes a sound source 40a that generates a musical sound waveform from waveform data, a left channel series adder 40e, and a right channel series adder 40f. The tone generator circuit 40 has 192 sound sources 40a, one left channel series adder 40e, and one right channel series adder 40f. In FIG. 2, two sound sources 40a, 1 are provided. Only one left channel series adder 40e and one right channel series adder 40f are shown, and the other configurations are not shown.

  Since the sound source circuit 40 has 192 sound sources 40a as described above, it can simultaneously generate a maximum of 96 stereo sounds for stereo sounds and a maximum of 192 monaural sounds for monaural sounds. It can occur at the same time.

  Note that the musical sound waveforms generated by the sound source 40a include a musical sound waveform A on the left channel side and a musical sound waveform B on the right channel side. When a musical sound corresponding to key-on is generated as a stereo sound, two sound waves are generated. The sound source 40a is assigned to the channel A side and the channel B side of the stereo sound, and the sound source 40a assigned to the channel A side of the stereo sound outputs the musical sound waveform A and is assigned to the channel B side of the stereo sound. The generated sound source 40a outputs a musical sound waveform B. On the other hand, when a monaural sound is generated in response to a key-on, one sound source 40a is assigned to the monaural sound, and the assigned sound source 40a outputs a musical sound waveform A.

  Pronunciation source 40a includes a waveform data reading section 40b, and if the demodulation circuit 40c, has a localization control circuit 40d, which is assigned to the left channel side (b) stereo sound, the (b) Stereo sound A musical sound waveform is generated as follows for each of the cases assigned to the right channel side and (c) the case assigned to a monaural sound.

  (A) The sound source 40a when assigned to the left channel side of the stereo sound generates a musical sound waveform as follows. First, the waveform data reading unit 40 b reads the waveform data A from the waveform memory 42. Next, the demodulation circuit 40c demodulates by adding the waveform data A and the waveform data B. The waveform data A is read from the waveform memory 42 by the waveform data reading unit 40b of the sound source 40a assigned to the left channel side of the stereo sound, and the waveform data B is assigned to the right channel side of the stereo sound. The waveform data is read from the waveform memory 42 by the waveform data reading unit 40b of the sound source 40a. Further, the localization control circuit 40d multiplies the calculation result by the demodulation circuit 40c and the coefficient k to generate the musical sound waveform A. The coefficient k is the reciprocal of the value (1 / k) on the left channel side of the ratio (1 / k: 1 / (1-k)) used when generating the waveform data A. The musical sound waveform A generated in this way is output to the left channel series adder 40e.

  (B) The sound source 40a when assigned to the right channel side of the stereo sound generates a musical sound waveform as follows. First, the waveform data reading unit 40 b reads the waveform data B from the waveform memory 42. Next, the demodulation circuit 40c demodulates by subtracting the waveform data B from the waveform data A. The waveform data A is read from the waveform memory 42 by the waveform data reading unit 40b of the sound source 40a assigned to the left channel side of the stereo sound, and the waveform data B is assigned to the right channel side of the stereo sound. The waveform data is read from the waveform memory 42 by the waveform data reading unit 40b of the sound source 40a. Further, the localization control circuit 40d multiplies the calculation result by the demodulation circuit 40c and the coefficient (1-k) to generate a musical sound waveform B. The coefficient (1-k) is a value (1 / (1-k)) on the right channel side of the ratio (1 / k: 1 / (1-k)) used when generating the waveform data B. Is the reciprocal of The tone waveform B generated in this way is output to the right channel series adder 40f.

  (C) The sound source 40a when assigned to a monaural sound generates a musical sound waveform as follows. First, the waveform data reading unit 40 b reads the waveform data A from the waveform memory 42. Next, the demodulation circuit 40c outputs the waveform data A as it is. That is, the demodulation circuit 40c in this case simply operates as an output distributor. Further, the localization control circuit 40d multiplies the output result from the demodulation circuit 40c and the coefficient k to generate the musical sound waveform A. The coefficient k is the reciprocal of the value (1 / k) on the left channel side of the ratio (1 / k: 1 / (1-k)) used when generating the waveform data A. The musical sound waveform A generated in this way is output to the left channel series adder 40e.

  In the case where become monaural sound from the stereo sound in the sound, in the sound source circuit 40, the value "0 the output level of the sound source 40a is a right-channel side in the pronunciation source 40a of the left and right channels in the stereo sound ”And then control to switch the demodulation operation to the distribution operation.

  Left channel sequence adder 40e includes all of the tone waveform A, all pronunciation source 40a assigned to the left channel side of the stereo sound in the sound has been generated, all assigned to monophonic sound in pronunciation Pronunciation source 40a All the musical sound waveforms A generated by are added and output to the DSP 50.

  The right channel series adder 40f adds all the musical sound waveforms B generated by all the sound source sources 40a assigned to the right channel side of the stereo sound being sounded, and outputs the result to the DSP 50.

  The tone generator circuit 40 includes an assignment memory (not shown). The assignment memory includes key assignment information (key code, on / off information thereof, on / off information of various switches, effect data). Etc.) are stored.

[Description of Configuration of DSP 50]
The DSP 50 is a digital signal processing device programmed to perform an effect applying process on the musical tone waveform and the effect sound waveform generated by the tone generator circuit 40. Further, the DSP 50 stores therein programs, effect data, reverb data, and the like. The DSP 50 is connected to a delay memory 52 capable of temporarily storing digital signals. The delay memory 52 can be used to provide effects such as delay, reverb, echo (delay), and chorus.

  The DSP 50 configured as described above receives an effect corresponding to the tone selected and set by the tone switch of the panel SW / LCD 11 when the musical tone waveform or the effect waveform generated by the tone generator 40 is input. Is added to the musical sound waveform generated by. Subsequently, the musical sound waveform to which the effect is applied and the effect sound waveform are added (hereinafter referred to as a composite waveform), and the reverb selected and set by the reverb switch of the panel SW / LCD 11 is applied to the composite waveform. To the DAC 60. When only the effect sound waveform is input, the effect sound waveform is output with reverb.

[Description of other configurations]
The DSP 50 is connected to a right output system consisting of a DAC 60R, Amp 70R and SP80R as well as a left output system consisting of a digital / analog converter (DAC) 60L, an amplifier (Amp) 70L and a speaker (SP) 80L. The output system converts the combined waveform (digital signal) output from the DSP 50 into an analog signal, amplifies it, and outputs the sound.

Since the other structure of the electronic keyboard instrument 1 is in accordance with a known technique, detailed description thereof is omitted here.
[Description of main processing]
Next, main processing executed by the CPU 30 of the electronic keyboard instrument 1 will be described with reference to the flowchart of FIG.

First, initialization is executed (S110). For example, each port of the CPU 30 is set, and a tone color in the RAM 32 is set.
Subsequently, it is determined whether there is an event such as a key operation or a switch operation (S120). If it is determined that there is an event (S120: YES), the event process (S130) is executed, the steady process (S140) is executed, and the process returns to S120. The event processing will be described later. Further, since the steady process is in accordance with a known technique, detailed description thereof is omitted here. On the other hand, when it is determined that there is no event (S120: NO), the steady process (S140) is executed without executing the event process (S130), and the process returns to S120.

[Explanation of event processing]
Next, event processing executed by the CPU 30 of the electronic keyboard instrument 1 will be described with reference to the flowchart of FIG. This event process is a subroutine of the main process described above, and is executed when the process proceeds to S130 of the main process.

  First, it is determined whether or not the event is a key depression (S310). If it is determined that the event is a key depression (S310: YES), a key depression process is executed (S340), and this subroutine is terminated. The key pressing process will be described later.

  On the other hand, if it is determined that the event is not a key press (S310: NO), it is determined whether the event is a key release (S320). If it is determined that the event is a key release (S320: YES), a key release process is executed (S350), and this subroutine is terminated. The key release process will be described later.

  On the other hand, when it is determined that the event is not a key release (S320: NO), it is determined whether or not the event is “other processing” (S330). If it is determined that the event is “other processing” (S330: YES), other processing is executed (S360), and this subroutine is terminated. Since “other processing” is in accordance with a known technique, a detailed description thereof is omitted here.

  On the other hand, if it is determined that the event is not “other processing” (S330: NO), error processing is executed (S370), and this subroutine is terminated. Since error processing is in accordance with a known technique, detailed description thereof is omitted here.

[Explanation of key press processing]
Next, a key pressing process executed by the CPU 30 of the electronic keyboard instrument 1 will be described with reference to the flowchart of FIG. This key pressing process is the above-described event processing subroutine, and is executed when the process proceeds to S340 of the event processing. In the following description, “the sound source 40a generates sound” is synonymous with the sound source 40a generating a musical sound waveform.

  First, a scanning process is executed (S410). In this scanning process, the 192 sound sources 40a included in the sound source circuit 40 are scanned, and the sound source 40a that has finished sounding or the sound source 40a that has been muffled most is scanned. As a scanning result, the sound source 40a being sounded is stored in the usage status memory 32a of the RAM 32 in order of the sound generation start time for each of the left and right stereo sounds and monaural sounds, and the total number (N) of the sound source 40a equipped, The number of sounds (S) and the number of sounds during monaural sound generation (M) are stored in the sound generation number storage register 32 b of the RAM 32.

  Subsequently, it is determined whether or not the value of the variable ctr is greater than or equal to the numerical value “N−1” (S420). The variable ctr indicates the number of the sound source 40a that is not sounding, and the constant N indicates the total number of equipment of the sound source 40a. If the value of the variable ctr is determined to be numeric "N-1" or more, that is, if the quantity of sound source 40a not in pronunciation is zero or one (S420: YES), sound source not being sounded A reduction process for increasing the quantity 40a and assigning a sound corresponding to a new key-on is executed (S430), and the process proceeds to S440. The reduction process will be described later. On the other hand, if the value of the variable ctr is determined to be less than the value "N-1" (S420: NO), it is not necessary to increase the number of sound sources 40a not being sounded at this stage, the above-mentioned The process proceeds to S440 without executing the reduction process.

  Subsequently, an allocation process is executed (S440). Specifically, when the process proceeds to S440 without executing the reduction processing is assigned a sound corresponding to the key-on for the two sound sources 40a not being pronounced as a stereo sound, whereas, after performing the reduction processing When the process proceeds to S440, the sound corresponding to the key-on is assigned to the sound source 40a that is not sounding according to the content determined by the reduction process.

Then, sound generation processing is executed (S450). Specifically, each sound source 40a is caused to sound the sound assigned in S440.
Further, since the quantity of the sound source 40a that is not sounding has been reduced by the above allocation process and sound generation process, the value of the variable ADD is added to the value of the variable ctr (S460), and this subroutine is terminated.

[Explanation of reduction processing]
Next, the reduction process executed by the CPU 30 of the electronic keyboard instrument 1 will be described with reference to the flowchart of FIG. This decrementing process is a subroutine for the key pressing process described above, and is executed when the process proceeds to S430 of the key pressing process.

  First, with reference to the stored contents of the pronunciation number storage register 32b, it is determined whether or not all the pronunciation sources 40a are producing a monaural sound (S505). If it is determined that all the sound sources 40a are sounding as monaural sound (S505: YES), the sound source that is sounding as a monaural sound is increased in order to increase the number of sound sources 40a that are not sounding by one. One of the sound sources 40a with the earliest sound generation start time is muted (S510), and the newly keyed musical sound is assigned as a monaural sound to the sound source 40a not sounding (S515), and the variable ADD is set. Is set to a numerical value “1” (S520), and this subroutine is terminated.

  On the other hand, all the sound source 40a is not in pronounced as monaural sound, that is, whether sound source 40a is not in pronunciation is one, the sound source 40a in pronunciation but all sound sources 40a is being sounded stereophonic there is the case where it is determined that more than one set (S505: nO), a odd sound source 40a is present, that is, sound source 40a is not in sound to determine whether there one (S525). If it is determined that there is one sound source 40a that is not sounding (S525: YES), in order to increase the number of sound sources 40a that are not sounding to two and secure a set of sound sources 40a, The sound source 40a with the earliest pronunciation start time among the sound sources 40a that are being sounded as a stereo sound is converted to monaural (S530), and the newly keyed musical sound is sent to the two sound sources 40a that are not sounded as stereo sound. (S535), the value of the variable ADD is set to a numerical value “2” (S540), and this subroutine is terminated.

  On the other hand, sound source 40a not being sounded even absent one, that is, if all of the sound source 40a is is a sounding sound source 40a of a sounding stereo sound is determined to be more than one set (S525 : NO), it is determined whether or not there are two or more sets of sound generation sources 40a that are sounding as stereo sound (S545). If it is determined that there are two or more pairs of sound sources 40a that are sounding as stereo sounds (S545: YES), the sound sources that are sounding as stereo sounds are increased in order to increase the number of sound sources 40a that are not sounding by two. Of the sources 40a, the two sets of pronunciation sources 40a with the earliest pronunciation start time are monauralized (S550), and the newly keyed musical sound is assigned as stereo sound to the two pronunciation sources 40a that are not in the reserved pronunciation. (S555), the value of the variable ADD is set to a numerical value “2” (S560), and this subroutine is terminated.

  On the other hand, when it is determined that there is only one set of sound source 40a that is sounding as a stereo sound (S545: NO), sound is generated as the stereo sound in order to increase the number of sound sources 40a that are not sounding by one. The sound source 40a in the middle is converted to monaural (S565), and the newly keyed musical sound is assigned as a monaural sound to one sounding source 40a that is not sounding (S515), and the value of the variable ADD is set to the numerical value “1” (S515). (S575) This subroutine is terminated.

[Explanation of key release processing]
Next, a key release process executed by the CPU 30 of the electronic keyboard instrument 1 will be described with reference to a flowchart of FIG. This key release processing is the event processing subroutine described above, and is executed when the process proceeds to S350 of the event processing.

First, search processing is executed (S610). Specifically, the pronunciation source 40a that no longer needs to be pronounced by the key release event is searched.
Subsequently, a mute process is executed for the sound source 40a searched in S610 (S620). At this time, a variable SUB is set. Note that the variable SUB is a variable indicating the type of sound generation, and is set to a numerical value “1” when the tone to be released is a monaural tone, while the tone to be released is a stereo tone. In some cases, the value is set to “2”.

Further, the value of the variable ctr is subtracted by the value of the variable SUB (S630).
Then, this subroutine ends.
[Effect of the first embodiment]
(1) As described above, according to the electronic keyboard instrument 1 of the first embodiment, for example, the sound source 40a assigned to the right channel side among the two sound sources 40a during stereo sounding to cope with a new key-on. When the sound source 40a on the left channel side is attenuated, the tone waveform A is output after the change, and the tone waveform A after the change is mixed with the left channel component L and the right channel component R, The sound including the left channel component L and the right channel component R is generated even though the number of the sound generation sources 40a allocated to the generation of the musical sound is decreased from two to one.

  Therefore, even when one of the two sound sources 40a during stereo sounding is attenuated in order to secure the sound source 40a assigned to the musical sound corresponding to the key-on, the sound transition can be made natural. Further, by attenuating one of the two sound sources 40a during stereo sound generation, the sound source 40a can be secured to cope with a new key-on, and a sufficient number of simultaneous sounds can be secured. In addition, the localization control and volume control that was performed in the conventional configuration is no longer necessary, and the reaction time required from the key-on to the generation of the music is shortened, the response speed is improved, and the key-on music is reproduced more faithfully. be able to.

  (2) Also, according to the electronic keyboard instrument 1 of the first embodiment, when there are two or more sound sources that are not sounding when the key is turned on (S420: NO), the musical sound corresponding to the key-on is stereo sound. Therefore, two of the two or more sound sources that are not sounding are assigned to the musical sound generated as a stereo sound corresponding to the key-on (S440). As a result, two sound sources 40a that are not sounding can be secured and the sound sources 40a can be reliably assigned to stereo sounds.

  (3) Also, according to the electronic keyboard instrument 1 of the first embodiment, when the key is turned on, there is one sound source that is not sounding, and there is one or more sound source sets that are sounding in stereo. Sometimes (S525: YES), the sound source 40a assigned to the right channel side included in one of the groups of sound sources 40a during stereo sounding is attenuated in order to generate a musical sound corresponding to key-on as a stereo sound. The two sound sources 40a that are not sounding are secured by making them into monaural sounds (S530), and the two sound sources 40a that are not sounded are allocated to musical sounds generated as stereo sounds corresponding to key-on (S535). , S440).

  As a result, two sound sources 40a that are not sounding can be secured and the sound sources 40a can be reliably assigned to stereo sounds. Even if the stereo sound is a monaural sound, the transition of the sound can be made natural. In addition, the number of simultaneous pronunciations can be increased.

  (4) Further, according to the electronic keyboard instrument 1 of the first embodiment, when it is the key-on, there is no sound source 40a not being sounded, and the presence set of pronunciation source 40a in the stereo sound is two or more When generating (S545: YES), in order to generate a musical sound corresponding to key-on as a stereo sound, the sound source 40a assigned to the right channel side included in two of the sound source sources 40a in the stereo sound generation is selected. The two sound sources 40a that are not sounding are secured by attenuating each to make a monaural sound, and the two sound sources 40a that are not sounded are assigned to musical sounds generated as stereo sounds corresponding to key-on (S555, S440).

  As a result, two sound sources 40a that are not sounding can be secured and the sound sources 40a can be reliably assigned to stereo sounds. Even if the stereo sound is a monaural sound, the transition of the sound can be made natural. In addition, the number of simultaneous pronunciations can be increased.

  (5) Further, according to the electronic keyboard instrument 1 of the first embodiment, when it is the key-on, there is no sound source 40a not being sounded, and the set pronunciation source 40a in the stereo sound is present one Sometimes (S545: NO), in order to generate a musical sound corresponding to the key-on as a monaural sound, the sound source 40a assigned to the right channel side included in the set of sound sources 40a during the stereo sounding is attenuated to produce a monaural sound. securing one pronunciation source 40a is not in pronunciation by reduction, assigned to the tone that generates a single sound source 40a not in pronunciation that its secured as monophonic sound corresponding to the key-on (S570, S440).

  As a result, even in a situation where there are few sound sources 40a that are not sounding, it is possible to generate a musical sound corresponding to key-on as a monaural sound. Even if the stereo sound is a monaural sound, the transition of the sound can be made natural. In addition, the number of simultaneous pronunciations can be increased.

  (6) Further, according to the electronic keyboard instrument 1 of the first embodiment, when it is the key-on, there is no sound source 40a not being sounded, the set pronunciation source 40a in the stereo sound is not present, and When there is a sound source 40a during monaural sound generation, that is, when all sound source sources are assigned to monaural sounds (S505: NO), in order to generate a musical sound corresponding to key-on as a monaural sound, One sound source 40a that is not sounding is secured by attenuating one of the sound source 40a, and the sound source 40a that is not sounding is secured as a musical sound that is generated as a monaural sound corresponding to the key-on. Assign (S515, S440).

  In this way, even in a situation where there are few sound sources 40a that are not being sounded, it is possible to generate a musical sound corresponding to key-on as a monaural sound. In addition, the number of simultaneous pronunciations can be increased.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, It is possible to implement in the following various aspects.

  (1) In the above embodiment, the coefficient k is assumed to satisfy the expression (3), but is not limited to this, and (A) coefficient k = 0.125 as described in (A) and (G) above. localization considerably becomes right side in the case of, as to satisfy the in the case of (G) coefficient k = 0.875 is in consideration of the fact that localization is considerably the left side, the coefficient k is the following relationship (4) Good.

0.25 ≦ k ≦ 0.75 Formula (4)
Thus, the unnaturalness can be further eliminated by keeping the left and right volume balance within three times.

(2) The coefficient k may satisfy the following expression (5).
k = 0.5 (5)
In this way, even when one sound source 40a of the set of sound sources 40a is attenuated in order to make the stereo sound into monaural, there is an effect that the left and right outputs are equal and the right and left balance is good. .

  (3) The value of the coefficient k may be set for each sound generation source 40a in accordance with the range of the newly keyed musical sound. As an example, the value of the coefficient k is set to be larger as the range of the newly keyed musical sound becomes lower, while the value of the coefficient k is set to be smaller as the range of the newly keyed musical sound becomes higher. And so on. In this way, it is possible to faithfully reproduce the range of the key-on musical tone.

(4) In the above embodiment, the waveform data generation unit 30c converts the positive phase component of the left channel component L and the positive phase component of the right channel component R of the musical sound stereo-sampled using the above equation (1) to 1 / Waveform data A mixed at a ratio of k: 1 / (1-k) is generated, and the normal phase component of the left channel component L and the inverse of the right channel component R of the tone sampled using the above formula (2) Similarly, the waveform data B is generated by mixing the phase components at a ratio of 1 / k: 1 / (1-k). However, the waveform data B is not limited to this, and the waveform data generation unit 30c performs the following processing. The opposite phase component of the left channel component L and the right phase component of the right channel component R of the tone sampled in stereo using the equation (6) are similarly mixed at a ratio of 1 / k: 1 / (1-k). To generate There.

WB = −L / 2k + R / 2 (1-k) (6)

Even if comprised in this way, there exists an effect similar to the said embodiment.

  (5) Further, the waveform data as described above is stored in a waveform data storage device such as a USB memory device, and the waveform data storage device is connected to the electronic keyboard instrument 1 and used as necessary. Also good. In this way, by storing the waveform data A and the waveform data B in the waveform data storage device, the waveform data can be moved between the devices. In the waveform data A, the left channel component L and the right channel component R are mixed in the above ratio, and a sound including the left channel component L and the right channel component R is generated even in one sound source 40a. Therefore, the waveform data storage device storing the waveform data described above can be shared with models that cannot produce stereo sound.

DESCRIPTION OF SYMBOLS 1 ... Electronic keyboard instrument, 10 ... Keyboard, 11 ... Panel SW / LED, 12 ... Pedal, 15 ... MIDI, 30 ... CPU, 30a ... Assignment part, 30b ... Control part, 30c ... Waveform data generation part, 31 ... Program Data memory, 32 ... Work RAM, 32a ... Usage status memory, 32b ... Sound generation number storage register, 33 ... I / F, 40 ... Sound source circuit, 40a ... Sound source, 40b ... Waveform data reading unit, 40c ... Demodulation circuit, 40d ... localization control circuit, 40e ... left channel series adder, 40f ... right channel series adder, 42 ... waveform memory, 50 ... DSP, 52 ... delay memory, 60 ... DAC, 70 ... amplifier, 80 ... speaker, 90 ... bus line

Claims (16)

Acquires waveform data of stereo sampled sound according to key-on, demodulates the acquired waveform data and controls the localization, generates multiple sound sources to generate musical sound waveform, and generates sound corresponding to key-on A musical sound generator for an electronic musical instrument that is generated based on a musical sound waveform generated by a source,
The waveform data includes waveform data A on the channel A side which is one of the left and right channels and waveform data B on the channel B side which is the other of the left and right channels. The waveform data A is stereo-sampled. The positive phase component of the left channel component L of sound and the positive phase component of the right channel component R are generated by mixing at a predetermined ratio, while the waveform data B includes the positive phase component of the left channel component L and the positive phase component of the left channel component L. It is generated by mixing the reverse phase component of the right channel component R in the ratio or by mixing the reverse phase component of the left channel component L and the positive phase component of the right channel component R in the ratio.
The musical sound waveform includes a musical sound waveform A on the channel A side and a musical sound waveform B on the channel B side. When a musical sound is generated as a stereo sound, the two sound generation sources are the stereo sound channel A side and the channel. The sound source assigned to the B side and assigned to the stereo sound channel A side outputs the musical sound waveform A, and the sound source assigned to the stereo sound channel B side outputs the music sound waveform B, When a musical sound is generated as a monaural sound, one sound source is assigned to a monaural sound, and the assigned sound source outputs the musical sound waveform A,
Furthermore, the pronunciation source is
When assigned to the channel A side of the stereo sound, the waveform data A and the waveform data B are acquired, and the acquired waveform data A and the waveform data B are added together to demodulate and control the localization. To generate the musical sound waveform A,
When the stereo sound is assigned to the channel B side, the waveform data A and the waveform data B are acquired, and the waveform data B is subtracted from the acquired waveform data A for demodulation and localization control. To generate the musical sound waveform B,
When the electronic musical instrument is assigned to a monaural sound, the musical sound waveform A is generated by acquiring the waveform data A, demodulating the acquired waveform data A, and performing localization control. Music generator. The musical sound generator for an electronic musical instrument according to claim 1,
When the waveform data A is generated by mixing the positive phase component of the left channel component L and the positive phase component of the right channel component R at a predetermined ratio, the following relational expression (1) is satisfied:
On the other hand, when the waveform data B is generated by mixing the positive phase component of the left channel component L and the negative phase component of the right channel component R at the above ratio, the following relational expression (2) is satisfied. An electronic musical instrument that satisfies the following relational expression (3) when it is generated by mixing the reverse phase component of the left channel component L and the positive phase component of the right channel component R at the above ratio: Musical sound generator.
Relational expression (1): W _A = L / 2k + R / 2 (1-k)
Relational expression (2): W _B = L / 2k−R / 2 (1-k)
Relational expression (3): W _B = −L / 2k + R / 2 (1-k)
However, W _A indicates waveform data A, and W _B indicates waveform data B. The coefficient k satisfies the following relational expression (4).
Relational expression (4): 0 <k <1 The musical sound generator for an electronic musical instrument according to claim 2,
The coefficient k satisfies the following relational expression (5) instead of the relational expression (4).
Relational expression (5): 0.25 ≦ k ≦ 0.75 In the musical sound generator for an electronic musical instrument according to claim 2 or 3,
The musical sound generator for an electronic musical instrument is characterized in that the value of the coefficient k is set for each sound generation source in accordance with the range of the musical sound keyed on. The musical sound generator for an electronic musical instrument according to claim 4,
The value of the coefficient k is set to be larger as the range of the key-on musical tone becomes lower, and the value is set to be smaller as the range of the key-on musical tone becomes higher. A musical sound generator for electronic musical instruments. The musical sound generator for an electronic musical instrument according to claim 2,
The coefficient k satisfies the following relational expression (6) instead of the relational expression (4).
Relational expression (6): k = 0.5 In the musical sound generator for an electronic musical instrument according to any one of claims 1 to 6,
A waveform data storage unit for storing the waveform data;
The sound generation source of an electronic musical instrument, wherein the sound generation source acquires the waveform data from the waveform data storage unit in response to key-on. The musical sound generator for an electronic musical instrument according to claim 7,
Furthermore, a waveform data generation unit for generating the waveform data is provided,
The waveform data generation unit generates the waveform data according to setting contents,
The waveform data storage unit stores the waveform data generated by the waveform data generation unit. In the musical sound generator for an electronic musical instrument according to any one of claims 1 to 6,
A waveform data generation unit for generating the waveform data;
The waveform data generation unit generates the waveform data in response to key-on,
The musical tone generation apparatus according to claim 1, wherein the sound source acquires the waveform data generated by the waveform data generation unit in response to key-on. The musical sound generator for an electronic musical instrument according to claim 9,
Furthermore, a waveform data storage unit for storing the waveform data is provided,
The waveform data storage unit stores the waveform data generated by the waveform data generation unit in response to key-on,
The musical tone generation apparatus according to claim 1, wherein the sound source acquires the waveform data generated by the waveform data generation unit in response to a key-on from the waveform data storage unit. In the musical sound generator for an electronic musical instrument according to any one of claims 1 to 10,
There are four or more pronunciation sources,
further,
If there are two or more sound sources that are not sounding when the key is turned on, two of the two or more sound sources that are not sounding are turned on to generate a sound corresponding to the key-on as a stereo sound. A musical sound generating apparatus for an electronic musical instrument, comprising: an assigning unit that assigns a corresponding musical sound generated as a stereo sound. The musical sound generator for an electronic musical instrument according to claim 11,
The assigning unit generates a musical sound corresponding to the key-on as a stereo sound when there is one sound source that is not sounding and at least one pair of sound sources that are sounded in stereo when the key-on is performed. Therefore, two sound sources that are not sounding are secured by attenuating the sound source assigned to the channel B side included in one of the sound source pairs during stereo sounding to produce a monaural sound. 2. A musical sound generating apparatus for an electronic musical instrument, wherein two sound sources that are not sounded are assigned to a musical sound generated as a stereo sound corresponding to a key-on. In the musical sound generator of the electronic musical instrument according to claim 11 or claim 12,
The allocating unit generates a musical sound corresponding to the key-on as a stereo sound when there is no sound source that is not sounding and there are two or more sound source pairs that are sounded in stereo when the key-on is performed. In addition, two sound sources that are not sounding are secured by attenuating the sound sources assigned to the channel B side included in two of the sound sound source pairs during stereo sounding, respectively, and making them monophonic. 2. A musical sound generating apparatus for an electronic musical instrument, wherein two sound sources that are not sounded are assigned to a musical sound generated as a stereo sound corresponding to a key-on. In the musical sound generator for an electronic musical instrument according to any one of claims 11 to 13,
The assigning unit generates a musical sound corresponding to the key-on as a monaural sound when there is no sound source that is not sounding and there is one pair of sound-generating sound sources when the key is turned on. The sound source assigned to the channel B side included in the set of sound sources that are currently sounding is attenuated to produce a monaural sound, thereby securing one sound source that is not being sounded. A musical sound generating device for an electronic musical instrument, wherein one sound source is assigned to a musical sound generated as a monaural sound corresponding to a key-on. In the musical sound generator for an electronic musical instrument according to any one of claims 11 to 14,
When the key is turned on, the assigning unit corresponds to key-on when there is no sound source that is not sounding, there is no sound source set that is sounding in stereo, and there is a sound source that is monaurally sounded. In order to generate a musical sound as a monaural sound, one sound source that is not sounding is secured by attenuating one of the sound sources that are sounding monaural, and one sound source that is not sounding is keyed on A musical sound generating device for an electronic musical instrument characterized by being assigned to a musical sound generated as a monaural sound.   A waveform data storage device for storing the waveform data A and the waveform data B according to claim 1.

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