JP2008070407A - Touch response detecting apparatus and electronic musical instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an appropriate touch response data with a small processing load. <P>SOLUTION: A touch response detecting circuit 5 comprises: a velocity count unit 29 which starts counting of a count value regarding a key which is turned on, according to switch-on of a first switch of two switches of the key, and which adds a count rate value to a current count value; a RAM 24 for storing the current count value; an interface unit 22 for outputting the touch response data based on the current count value; a count rate generating unit 28 for calculating a count rate value to be added to the current count value. The RAM 24 stores a correction data for correcting the count rate value for each key, and the count rate value is corrected based on the correction data, and the corrected count rate value is output to the velocity count unit 29. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a touch response detection device for detecting the speed of operation of a performance operator such as a key, and an electronic musical instrument including the touch response detection device.

Conventionally, the speed of operation of a performance operator such as a key of an electronic keyboard instrument, that is, the pressing speed of the performance operator is detected by measuring the time difference when two stepped rubber contacts are turned on. Is common. However, the interval at which these switches are arranged is only a few mm, and a variation of several percent occurs in the interval in the manufacturing process. Therefore, even if a certain electronic keyboard instrument is played at the same pressing speed due to variations in the interval, the data of the pressing speed detected by the keyboard, that is, the key touch data is different, and the volume is not intended. There was a problem that the sound of. Therefore, in order to correct the variation in the contact interval, for example, in the technique disclosed in Patent Document 1, correction coefficients M _{1 to} M ₈₈ (= K / V _{1 to} K / V ₈₈ V ₁ to (V ₈₈ : keystroke speed) is stored in the EPROM 14, and when the sound generation operation is performed, the CPU reads out the timbre parameters and the like from the ROM 13, and also reads out the correction coefficient M of the keyboard that is keyed in from the EEPROM.
JP-A-7-295568

  In the technique disclosed in Patent Document 1, when the CPU generates a tone corresponding to the pressed key, the correction coefficient corresponding to the keystroke speed is read from the memory (EEPROM), and the read correction coefficient is read out. Sound processing that takes into account. Therefore, there is a drawback that the processing load at the start of sound generation in the CPU is increased.

  In addition to correcting the switch error of the keyboard, it is desirable that the key touch feeling can be set according to the key range and tone color while suppressing an increase in processing load.

  An object of the present invention is to provide a touch response detection device capable of obtaining appropriate touch response data with a small processing load, and an electronic musical instrument including the touch response detection device.

  An object of the present invention is a touch response detection device that calculates touch response data indicating a key pressing speed by measuring an on-time difference between two switches arranged apart from each key constituting a keyboard, Velocity counting means that starts counting the count value for the key when the first switch of the two switches of the key is turned on, and adds the count rate value to the current count value at a predetermined timing; Storage means for storing the current count value; interface means for outputting touch response data based on the current count value of the key when the second switch is turned on; and adding to the current count value Count rate value calculating means for calculating a count rate value to be calculated, wherein the storage means is configured to count the count for each key. Correction data for correcting a rate value is stored, and the count rate value calculating means calculates the corrected count rate value by correcting the count rate value based on the correction data, and the correction This is achieved by a touch response detection device that outputs the counted rate value to the velocity counting means.

  According to the present invention, in the touch response detection device, the count rate value to be added to the count value is corrected with the correction data in the coefficient of the count value, and the corrected count rate value is added to the current count value. ing. This makes it possible to calculate appropriate touch response data without increasing the processing load.

  In a preferred embodiment, the interface means obtains touch response data by inverting the bit of the current count value.

  In a preferred embodiment, the storage means stores a count rate value corresponding to the current count value, and the count rate value calculation means outputs the current count value output from the storage means. The corresponding count rate value is corrected based on the correction data.

  In another preferred embodiment, the correction data for correcting the count rate value stored in the storage means is a ratio value for increasing or decreasing the count rate value, A count rate value calculation unit multiplies the count rate value by the correction data.

  For example, the correction data for correcting the count rate value stored in the storage means is a value that cancels the error of the time difference from turning on the first switch to turning on the second switch for each key. .

  Alternatively, the correction data for correcting the count rate value stored in the storage means increases or decreases as the pitch changes.

  Alternatively, the correction data for correcting the count rate value stored in the storage unit is a value according to the tone range to which the tone color is assigned for each tone color generated by the tone generation unit.

Further, an object of the present invention is a keyboard having a plurality of keys, each key having two switches arranged apart from each other,
Touch response detection means for calculating touch response data indicating a key pressing speed by measuring an on-time difference between two switches of each key constituting the keyboard, wherein the first of the two switches of the key. When the switch is turned on, the count value for the key is started to be counted, and at a predetermined timing, velocity count means for adding the count rate value to the current count value, storage means for storing the current count value, Interface means for outputting touch response data based on the current count value of the key when the second switch is turned on, and count rate value calculation for calculating a count rate value to be added to the current count value Correction means for correcting the count rate value for each key. And the count rate value calculation means calculates the corrected count rate value by correcting the count rate value based on the correction data, and the corrected count rate value Output to the velocity counting means, touch response detection means,
The tone generation means receives the touch response data and the pitch of the pressed key, generates the tone of the velocity with the specified tone, and the velocity based on the touch response data. Control means to direct;
Musical tone generation means for generating musical tone data of tone color, pitch and velocity instructed by the control means;
An electronic musical instrument characterized by comprising:

  In a preferred embodiment, the first correction data is a value for canceling an error in a time difference from turning on the first switch to turning on the second switch for each key for correcting the count rate value. The second correction data whose value increases or decreases according to the change in pitch and / or the tone range to which the tone color is assigned for each tone color generated by the tone generation means Correction data storage means for storing third correction data, and the control means stores the first correction in the storage means of the touch response detection means via the interface means of the touch response detection means. Data, second correction data, or third correction data is written.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the touch response detection apparatus which can obtain appropriate touch response data with a small processing load, and the electronic musical instrument provided with the said touch response detection apparatus.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing an outline of an electronic musical instrument according to an embodiment of the present invention. As shown in FIG. 1, the electronic musical instrument includes a microcomputer 1, a ROM (Read Only Memory) 2, a RAM (Random Access Memory) 3, switches 4, a touch detection circuit 5, a keyboard 6, a tone generation circuit 7, and a waveform ROM 8. , A D / A converter (DAC) 9, an amplifier circuit 10, and speakers 11 and 12. The microcomputer 1, the ROM 2, the RAM 3 and the tone generation circuit 7 are connected to the bus 13, and the touch detection circuit 5 is connected to the microcomputer 1 through a serial interface.

  The microcomputer 1 controls the entire electronic musical instrument, reads the program and data from the ROM 2 storing the program and data, and executes the program. Data generated by executing the program is stored in the RAM 3 which is a work area. The switches 4 are arranged on the console panel of the electronic musical instrument. The microcomputer 1 detects the operation of the switches 4 by the performer. As will be described in detail later, the touch detection circuit 5 sends a scanning signal to the keyboard 6 at a predetermined timing, and in response to turning on of the two switches arranged on the keys of each keyboard 6, performance operation data ( (Pitch and touch response data) are generated and output to the microcomputer 1. In the present embodiment, the keyboard 6 has 88 keys, and each key is provided with two switches in the longitudinal direction. When the key is pressed, the first switch is first turned on. When pressed, the second switch is turned on.

  The microcomputer 1 controls the musical tone generation circuit 7 based on the tone color designated by the operation of the switches 4 and the performance operation data including the touch response data output from the touch detection circuit 5 to generate a predetermined musical tone. generate. The musical tone generation circuit 7 reads the waveform data of the tone color designated from the waveform ROM 8, generates a musical tone having a pitch and volume (velocity) according to the performance operation data, and outputs it to the DAC 9. The DAC 9 converts the digital data output from the tone generation circuit 7 into an analog signal. The analog signal is emitted from the speakers 11 and 12 via the amplifier circuit 10.

  FIG. 2 is a block diagram showing the configuration of the touch detection circuit according to the present embodiment in more detail. In FIG. 2, in addition to the members constituting the touch detection circuit 5, the keyboard 6 of FIG. 1 is also displayed. As shown in FIG. 2, the touch detection circuit 5 includes a UART (Universal Asynchronous Receiver Transmitter) 21, an interface unit 22, a selector (SEL) 23, a RAM 24, a timing generator 25, a key-in unit 27, a velocity count rate generator 28, And a velocity count unit 29.

  The UART 21 is an asynchronous serial interface and controls data transmission / reception with the microcomputer 1. Data sent from the microcomputer 1 in a serial format is converted into a parallel format and further written into a predetermined area of the RAM 24 via the interface unit 22 and the selector 23. The touch response data obtained by the calculation in the touch detection circuit 5 is transferred to the microcomputer 1 via the interface unit 22 and the UART.

  The interface unit 22 stores the touch detection control data written via the UART 21 in a predetermined area of the RAM 24 via the selector 23 to which the output from the velocity count unit 29 is connected to the other input. The touch detection control data includes velocity rate data and velocity correction data.

  When the interface unit 22 outputs the touch detection control data via the UART as described above, the selector 23 selects the touch detection control data and outputs it to the RAM 24. In other cases, an output (velocity count value) from the velocity count unit 29 is selected and output to the RAM 24.

  The timing generator 25 outputs a timing signal for detecting on / off of the switch of the keyboard 6 to the keyboard 6 and outputs CNT [6: 0] as an address of the RAM 24. As described above, in this embodiment, two switches are provided for each of 88 keys, and 176 switches are arranged on the keyboard 6. The switches constitute an 8 × 22 matrix. The key-in unit 27 scans the matrix and detects on / off of the switch of each key of the keyboard 6 according to the timing signal of the timing generator 25. The key-in unit 27 time-divides the signal indicating the captured switch state and outputs it to the velocity count unit 29.

  As described in detail later, the velocity count rate generator 28 calculates a velocity count rate based on the velocity count value, velocity rate data, and velocity correction data, and outputs it to the velocity count unit 29. The velocity count unit 29 adds a velocity count value and the velocity count rate output from the velocity count rate generator 28 to calculate a new velocity count value. The new velocity count value is stored in a predetermined area of the RAM 24 via the selector 23.

  In the present embodiment, the RAM 24 can store 30-bit data. Addresses 0 to 87 store ST [3: 0], VC [19: 0], and COR [5: 0] corresponding to each address. 30-bit data ST [3: 0], VC [19: 0] and COR [5: 0] represent information for each keyboard. Status ST [3: 0] indicates the status of the key count. For example, the 4-bit value identifies the status such as preparing for counting or counting. The velocity count value VC [19: 0] indicates a value counted in a key with the keyboard 6 after the first switch is turned on until the second switch is turned on. The velocity count value VC [19: 0] is incremented by a velocity count rate calculated as described later at a predetermined timing while the status ST indicates “counting”. The velocity correction data COR [5: 0] is a value for correcting the velocity count value for each key of the keyboard 6 (more specifically, for correcting the velocity count rate added to the velocity count value). The data is specified by using a signal CNT [6: 0] described later as an address.

  Further, VR [7: 0] is stored in RAM addresses 88 to 105 corresponding to the respective addresses. These are specified by using a signal VC [19:16] described later as an address.

  In the touch detection circuit 5 shown in FIG. 2, when the key-in unit 27 detects that the first switch of a key is turned on, the status ST [3: 0] in the data corresponding to the key indicates that the key is being counted. The value is changed to a value, and counting of the velocity count value VC [19: 0] is started.

  The velocity count unit 29 adds the velocity count rate calculated by the velocity count rate generator 28 to the velocity count value VC [19: 0] at a predetermined timing. The velocity count value VC is stored in the key address in the RAM 24 via the selector 23. The addition of the velocity count rate to the velocity count value VC is repeated until the key-in unit 27 detects that the second switch of the same key is turned on.

  When the key-in unit 27 detects that the second switch of the key is turned on, the velocity count value VC of the key at that time is given to the interface unit 22, and each of the velocity count values in the interface unit 22 is given. The bit value is inverted. This inverted value becomes touch response data indicating the key pressing speed. The touch response data is output to the microcomputer 1 via the UART 21 together with key information (for example, pitch information). The microcomputer 1 generates performance operation data when a certain pitch is keyed on at a certain intensity (or speed) based on the pitch information and touch response data, and outputs the performance operation data to the musical tone generation circuit 7.

  When the key-in unit 27 detects that the key is switched off, the velocity count unit 29 gives key information (pitch information) and information indicating the key-off to the interface 22. The given information is output to the microcomputer 1 via the UART 21. In response to the reception of the information indicating the key-off, the microcomputer 1 generates performance operation data indicating the key-off and outputs it to the musical sound generating circuit 7.

  FIG. 3 is a block diagram showing in detail the configuration of the velocity count rate generator according to the present embodiment. As shown in FIG. 3, the velocity count rate generator 28 includes a selector (SEL) 31, FFs 32 to 35, a subtracter 36, multipliers 37 and 40, an adder 38, and a conversion table 39. .

  The FF 33 holds the upper bits VC [19:12] of the velocity count value VC. One input of the selector 31 is supplied with CNT [6: 0] from the timing generator 25, and the other input is supplied with a predetermined upper bit VC [19:16] of VC. Either one is output depending on the timing. The output of the selector 31 is an address of the RAM 24.

  In the FF 34, velocity rate data VR designated and read by the address VC [19:16] in the RAM 24 is stored (hereinafter, this data is referred to as VR (VC [19:16])). The FF 33 stores velocity data specified and read by an address (VC [19:16] +1) (hereinafter, this data is referred to as VR (VC [19:12] +1)). The FF 35 stores velocity correction data COR [5: 0].

  As described above, among the outputs from the FF 32, the higher-order VC [19:16] of the higher-order bits VC [19:12] is output to the selector 31, while the lower-order VC [15:12] is It is output to the multiplier 37.

  Hereinafter, the operation in the velocity count rate generator 28 shown in FIG. 3 will be described. FIG. 4 is a flowchart showing the operation of the velocity count rate generator according to the present embodiment. The velocity count rate generator 28 reads the data at the address CNT [6: 0] from the RAM 24 for the key specified by the value of the output CNT [6: 0] of the timing generator 25. Of the data read from the RAM 24, the upper bits VC [19:12] of the velocity count value are stored in the FF 32 (step 401). Of the data read from the RAM 24, velocity correction data COR [5: 0] is stored in the FF 35 (step 402).

  Next, the velocity data VR (VC [19:16]) is received from the RAM 24 with the higher-order data VC [19:12] of the higher-order data VC [19:12] of the velocity count value stored in the FF 32 as an address. It is read out and stored in the FF 34 (step 403). Also, the velocity rate data VR (VC [19:12] +1) is read from the RAM 24 using (VC [19:12] +1) as an address and stored in the FF 33 (step 404).

  The output VR (VC [19:12] +1) of the FF 33 and the output VR (VC [19:16]) of the FF 34 are applied to the subtractor 36, and the difference value Diff [7: 0] = VR (VC [19:12]. +1) -VR (VC [19:16]) is calculated. Further, the difference value Diff is multiplied by the data VC [15:12] on the lower side of VC [19:12] by the multiplier 37 and further added by VR (VC [19:16]) by the adder 38. The As a result, the interpolation value Int = VR (VC [19:16]) + VC [15:12] × Diff is obtained (step 405).

  In the present embodiment, the subtractor 36, the multiplier 37, and the adder 38 set Diff, which is the difference between VR (VC [19:12] +1) and VR (VC [19:16]), to VC [15 : 12] constitutes an arithmetic system for linear interpolation. By adding the product of Diff and VC [15:12] to VR (VC [19:16]), VR [7: 0], which is a relatively coarse value by address VC [19:16], is An interpolated value Int interpolated with the lower value VC [15:12] can be obtained.

  FIG. 5A is a diagram for explaining velocity rate data according to the present embodiment. In FIG. 5A, the left side corresponds to the higher-order data VC [19:12] of the velocity count value. As described above, the velocity rate data VR [7: 0] is read from the RAM 24 for each predetermined high-order bit (the most significant 4 bits) of the velocity count value as an address. An interpolation value as shown in FIG. 6 can be obtained by the interpolation described above. In the graph of FIG. 6, the vertical axis corresponds to the interpolation value of the velocity rate value, and the horizontal axis corresponds to the higher-order data VC [19:12] of the velocity count value.

  Further, the interpolation value Int is output to the conversion table 39, and the conversion value is output from the conversion table 39. FIG. 5B is a diagram illustrating a configuration example of a conversion table according to the present embodiment. As shown in FIG. 5B, the conversion table 39 is indicated by interpolation values Int, VR [7: 0]. ) Is input, and a value as shown in the conversion data is output. As can be understood from FIG. 5B, the conversion table 39 exponentially converts the interpolation value subjected to linear interpolation.

  FIG. 7 is a graph for explaining an interpolation value that has passed through the conversion table 39. In FIG. 7, the vertical axis corresponds to the interpolation value of the velocity rate value that has been exponentially converted, and the horizontal axis corresponds to the velocity count value.

  The interpolated value that has been exponentially converted is added to the velocity count value in the velocity count unit 29 as a velocity count rate after being corrected by velocity correction data described later. Thus, by counting the interpolated values that have been exponentially converted, a velocity count curve as shown in the graph of FIG. 8 can be obtained. In this velocity curve, the vertical axis represents velocity data (that is, the inverted value of the velocity count value), and the horizontal axis represents time.

  As described above, in the present embodiment, the velocity rate of the polygonal line is interpolated, and the result obtained by exponentially converting this is counted (integrated). Therefore, the obtained velocity curve (FIG. 8) is curved.

  Next, correction according to the present embodiment will be described. The exponent-converted interpolation value that is the output of the conversion table 39 is given to one input of the multiplier 40. The other input of the multiplier 40 is provided with velocity correction data COR [5: 0] from the FF 35. Here, since the bit length of the correction data is reduced by limiting the correction range, 11 (binary number) is added to the correction data COR [5: 0], and 110000-1111111 (binary number). The range is provided to the multiplier 40 as 8-bit data. Therefore, the multiplier 40 multiplies the converted value and the velocity correction data and outputs the result. This output is added as a velocity count rate in the velocity count unit 29 with a velocity count value VC [19: 0].

If the corrected correction value 11100000 (binary number) after the conversion is zero,
11000000 (binary number) = 192 (decimal number)
11100000 (binary number) = 224 (decimal number): correction zero 11111111 (binary number) = 255 (decimal number)
Therefore, as the correction range,
(192-224) /224=-14.286%
From (255-224) / 224 = 13.839%
It becomes.

  In the present embodiment, correction data for correcting variations between switch contacts is stored in the RAM 24 as velocity correction data for each key. Even if the key is turned on with the same strength due to the physical displacement of the two switches placed on the key and the characteristics of the switch itself, the first switch is turned on and the second switch is turned on. The time until it may vary depending on the key. In the present embodiment, this is called an error between switch contacts. Therefore, in the present embodiment, an error between the switch contacts of the keyboard is separately measured, and velocity correction data COR for each key based on the error is sent from the microcomputer 1 via the UART 21, the interface unit 22, and the selector 23. And stored in the RAM 24.

  FIG. 9 is a graph for explaining velocity correction data according to the present embodiment. In FIG. 9, the horizontal axis indicates a key. The vertical axis shows the measured error between switch contacts for each key. In this example, when the velocity data is set to 0 to 127 in the measuring device (not shown), the key is depressed so that the velocity data corresponds to “72”. Based on the time difference until the switch is turned on, velocity data output without correction by velocity correction data is acquired from the touch detection circuit 5 according to the present embodiment. The actually measured and outputted velocity data varies slightly depending on the key as shown in FIG. Therefore, in the present embodiment, a value for canceling the error is calculated for each key, and this value is stored in the RAM 24 as velocity correction data for the key. The storage of the velocity correction data in the RAM 24 is realized by giving velocity correction data for each key to the RAM 24 from the microcomputer 1 via the UART 21, the interface unit 22, and the selector 23, and writing it in the RAM 24.

  In the example of FIG. 9, the velocity correction data may be (100 + A) / 100, which is the ratio value for canceling the error. Here, A is a ratio (percentage) of a signed error, that is, (actual measurement value−theoretical value) / theoretical value. For example, in the above example, if the actually measured velocity data for a certain key is “66”, the velocity correction data is (100+ (66−72) / 72) / 100.

  The velocity count value is basically the distance between two contacts divided by the count rate. In other words, it can be written as follows.

Velocity count value = distance between two contacts / count rate So, if the error is A%,
Velocity count value = (distance between two contacts × (100 + A) / 100) /
(Count rate x Velocity correction value)
Velocity correction value = (100 + A) / 100
By multiplying the velocity correction data by the count rate to obtain a correction value, it becomes possible to cancel the variation between the contacts.

  According to the present embodiment, velocity correction data for canceling variations (errors) between switch contacts is stored in the RAM 24 for each key, and the velocity correction data is converted into a count rate (in this embodiment, exponential conversion is performed). The final corrected velocity count rate to be added to the velocity count value is obtained by multiplying by the velocity rate data). Thereby, the variation between the switch contacts for each key can be canceled, and touch response data without an error for each key can be obtained.

  The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  For example, in the above embodiment, velocity correction data for canceling the variation between the switch contacts for each key is stored in the RAM 24, and this is multiplied by the velocity rate data to obtain a correction value. Thus, the touch response data having no error for each key is obtained. However, the velocity correction data is not limited to this.

  FIG. 10 is a graph showing another example of velocity correction data. In the graph of FIG. 10, the horizontal axis represents the key, and the vertical axis represents the rate correction value (percent). In this example, the velocity count rate increases as the key becomes higher. That is, the velocity count value tends to increase. Therefore, the touch response data that is the inverted value of the velocity count value becomes smaller as the frequency becomes higher. Thereby, it becomes possible to set so that a touch feeling becomes lighter as the frequency increases.

  FIG. 11 is a graph showing still another example of velocity correction data. In the graph of FIG. 11, among the 61 keys (0 to 60), the split point is between the 17th key and the 18th key. The musical tone generation circuit 7 generates musical tones with different timbres on the low frequency side and the high frequency side at the split point. In this example, the velocity count rate on the low tone side is reduced by 5%, while the velocity count rate on the high tone side is increased by 5%. That is, the velocity count value is less likely to be higher than normal on the low frequency side, and the velocity count value is likely to increase on the high frequency side. Therefore, touch response data that is an inverted value of the velocity count value is larger on the low frequency side and smaller on the high frequency side. As a result, the melody on the high frequency side can give a more expression, while the accompaniment (for example, automatic accompaniment) on the low frequency side can have a stable volume.

  As described above, according to the present invention, by changing the velocity correction data stored in the RAM 24, it is possible to obtain touch response data corresponding to the key range and touch response data corresponding to the timbre. Hereinafter, the change of velocity correction data according to the present embodiment will be described.

  For example, initially, the RAM 24 stores a value for canceling the variation between the contacts. As shown in FIG. 12, a group of values for canceling the variation between the contacts is also stored in the ROM 2 of the electronic musical instrument (refer to the first velocity correction data group: reference numeral 1201). Further, the ROM 2 stores a group of correction values (second velocity correction data group: see reference numeral 1202) as shown in FIG. 10, and low band correction values and high band values for each tone. Are stored (third velocity correction data group: see reference numeral 1203). Both the second velocity correction data and the third velocity correction data have a ratio value to be multiplied by the count rate.

  As shown in FIG. 13, for example, when the microcomputer 1 receives the user's operation of the switch group 4 instructing the setting to reduce the touch feeling in the high frequency range (step 1301), the second velocity is read from the ROM 2. The correction data group and the first velocity data group are read (steps 1302, 1303). Next, the first velocity correction data and the second velocity correction data relating to the same key are multiplied (step 1304), and the multiplication value for each key is written in the RAM 24 of the touch detection circuit 5 as new velocity correction data ( Step 1305). The multiplication value obtained in this manner is a ratio value to be multiplied by the count rate in consideration of the touch feeling due to the sound range while considering the variation between the contacts.

  Further, as shown in FIG. 14, when the microcomputer 1 receives a high-pitched tone tone, a low-pitched tone color, and a key split instruction including a split point (step 1401), the low-frequency range is set from the ROM 2. The low-frequency correction value for the timbre is read (step 1402), and the high-frequency correction value for the timbre set for the high frequency is read (step 1403). The microcomputer 1 reads the first velocity data group from the ROM 2 (step 1404).

  Next, the microcomputer 1 multiplies the first velocity correction data related to the same key and the low frequency correction value for the keys belonging to the low frequency band (step 1405), and the same for the keys stored in the high frequency band. Multiply the first velocity correction data related to the key and the high frequency correction value (step 1406). The microcomputer 1 writes the multiplication value for each key into the RAM 24 of the touch detection circuit 5 as new velocity correction data (step 1407). The multiplication value obtained in this way takes into account the difference in volume between the high frequency and the low frequency at the time of splitting while considering the variation between the contacts.

  Of course, as described above, the second velocity correction data or the third velocity correction data may be written as velocity correction data in the RAM 24 of the touch detection circuit 5 without being multiplied with the first velocity correction data. good.

FIG. 1 is a block diagram showing an outline of an electronic musical instrument according to an embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of the touch detection circuit according to the present embodiment in more detail. FIG. 3 is a block diagram showing in detail the configuration of the velocity count rate generator according to the present embodiment. FIG. 4 is a flowchart showing the operation of the velocity count rate generator according to the present embodiment. FIG. 5A is a diagram illustrating velocity rate data according to the present embodiment, and FIG. 5B is a diagram illustrating a configuration example of a conversion table according to the present embodiment. FIG. 6 is a graph showing an example of interpolation values according to the present embodiment. FIG. 7 is a graph for explaining an interpolation value that has passed through the conversion table according to the present embodiment. FIG. 8 is a graph for explaining a velocity curve according to the present embodiment. FIG. 9 is a graph for explaining velocity correction data according to the present embodiment. FIG. 10 is a graph showing another example of velocity correction data. FIG. 11 is a graph showing still another example of velocity correction data. FIG. 12 is a diagram for explaining velocity correction data stored in a ROM according to another embodiment of the present invention. FIG. 13 is a flowchart illustrating an example of processing executed in a microcomputer according to another embodiment. FIG. 14 is a flowchart illustrating an example of processing executed in a microcomputer according to another embodiment.

Explanation of symbols

1 Microcomputer 2 ROM
3 RAM
4 Switches 5 Touch detection circuit 6 Keyboard 7 Musical sound generation circuit 8 Waveform ROM
9 DAC
10 Amplifying circuit 11, 12 Speaker 21 UART
22 Interface unit 23 Selector 24 RAM
25 Timing generator 27 Key-in unit 28 Velocity count rate generator 29 Velocity count unit

Claims (9)

A touch response detection device that calculates touch response data indicating a key pressing speed by measuring an on-time difference between two switches spaced apart from each key constituting a keyboard,
Velocity counting means that starts counting the count value for the key when the first switch of the two switches of the key is turned on, and adds the count rate value to the current count value at a predetermined timing; ,
Storage means for storing the current count value;
Interface means for outputting touch response data based on a current count value of the key in response to turning on of the second switch;
Count rate value calculating means for calculating a count rate value to be added to the current count value,
The storage means stores correction data for correcting the count rate value for each key,
The count rate value calculation means calculates the corrected count rate value by correcting the count rate value based on the correction data, and outputs the corrected count rate value to the velocity count means. A touch response detection device characterized by:   The touch response detection apparatus according to claim 1, wherein the interface unit obtains touch response data by inverting a bit of the current count value. The storage means stores a count rate value corresponding to the current count value;
3. The count rate value calculation unit corrects a count rate value corresponding to the current count value output from the storage unit based on the correction data. Touch response detection device. The correction data for correcting the count rate value stored in the storage means is a ratio value for increasing or decreasing the count rate value,
The touch response detection device according to claim 1, wherein the count rate value calculation unit multiplies the count rate value by the correction data.   The correction data for correcting the count rate value stored in the storage means is a value for canceling the error of the time difference from turning on the first switch to turning on the second switch for each key. The touch response device according to claim 4, wherein   5. The touch according to claim 4, wherein the correction data for correcting the count rate value stored in the storage means increases or decreases as the pitch changes. Response device.   The correction data for correcting the count rate value stored in the storage means is a value according to a tone range to which the timbre is assigned for each timbre produced by the tone generation means. Item 5. The touch response device according to Item 4. A keyboard comprising a plurality of keys, each key having two switches spaced apart from each other;
Touch response detection means for calculating touch response data indicating a key pressing speed by measuring an on-time difference between two switches of each key constituting the keyboard,
Velocity counting means that starts counting the count value related to the key when the first switch of the two switches of the key is turned on, and adds the count rate value to the current count value at a predetermined timing;
Storage means for storing the current count value;
Interface means for outputting touch response data based on a current count value of the key in accordance with turning on of the second switch; and
Count rate value calculating means for calculating a count rate value to be added to the current count value;
The storage means stores correction data for correcting the count rate value for each key, and the count rate value calculation means corrects the count rate value based on the correction data. Calculating a corrected count rate value, and outputting the corrected count rate value to the velocity count unit;
The tone generation means receives the touch response data and the pitch of the key that was pressed, generates the tone of the velocity with the specified tone, and the velocity based on the touch response data. Control means to direct;
Musical tone generation means for generating musical tone data of tone color, pitch and velocity instructed by the control means;
An electronic musical instrument characterized by comprising: Furthermore, first correction data that is a value for canceling an error in a time difference from turning on the first switch for each key to turning on the second switch for correcting the count rate value;
The second correction data whose value increases or decreases according to the change in the pitch, and / or the third based on the tone range to which the tone color is assigned for each tone color generated by the tone generation means. Correction data storage means for storing the correction data,
The control means writes the first correction data, the second correction data, or the third correction data into the storage means of the touch response detection means via the interface means of the touch response detection means. The electronic musical instrument according to claim 8, wherein the electronic musical instrument is configured.