JP6728771B2 - Detection device and program - Google Patents

Description

The present invention relates to a technique for detecting the movement of a plurality of moving bodies such as keys of a keyboard instrument.

Various techniques for optically detecting movements of a plurality of moving bodies such as keys of a keyboard instrument have been conventionally proposed. For example, in Patent Document 1, each key is made to correspond to a combination of a plurality of light emitting units and a plurality of light receiving units, and each key is made to correspond to a light receiving level of each light receiving unit when each of the plurality of light emitting units sequentially emits light. A technique for detecting movement of a key is disclosed.

Japanese Patent Laid-Open No. 9-54584

By the way, the frequency of key depression of the keyboard instrument is different for each key. In the technique of Patent Document 1, each light emitting unit is driven under a common condition for a key that is actually hardly pressed and a key that is frequently pressed. Therefore, there is a problem that the movement of a plurality of keys cannot be detected efficiently (for example, the key pressing is detected with a higher precision than necessary for a key with a low key pressing frequency). In consideration of the above circumstances, an object of the present invention is to efficiently detect the movement of a plurality of moving bodies.

In order to solve the above problems, the detection device according to a preferred embodiment of the present invention, a moving body corresponding to a different combination of each of the plurality of light emitting units and each of the plurality of light receiving units, of the light emitting unit The light emitting unit includes an operation detecting unit that generates detection data indicating a light receiving level of the light receiving unit that varies according to the position of the moving body during light emission, and a light emission control unit that sequentially emits light from each of the plurality of light emitting units. The control unit sets the driving condition for causing the first light emitting unit of the plurality of light emitting units to emit light and the driving condition for causing the second light emitting unit different from the first light emitting unit to emit light. In the above aspect, the first light emitting unit and the second light emitting unit emit light under different driving conditions. Therefore, it is possible to efficiently detect the movements of the plurality of moving bodies, as compared with the configuration in which all the light emitting units emit light under a common drive condition.

In a preferred aspect of the present invention, the driving condition is a light emission cycle of the light emitting section, and the light emission control section causes the second light emitting section to emit light at a longer cycle than the first light emitting section. In the above aspect, it is possible to reduce the power consumption required to detect the movement of the moving body corresponding to the second light emitting unit while ensuring the time resolution of the detection of the moving body corresponding to the first light emitting unit. is there.

In a preferred aspect of the present invention, the light emission control unit sequentially causes each of the plurality of light emitting units to emit light by supplying a drive current during the light emitting period, and the second light emitting unit maintains the drive current constant within the light emitting period. On the other hand, for the first light emitting portion, the drive current is changed to a plurality of currents within the light emitting period. In the above aspect, it is possible to detect the movement of the moving body corresponding to the first light emitting unit with high accuracy, and reduce the power consumption required for detecting the movement of the moving body corresponding to the second light emitting unit. is there.

In a preferred aspect of the present invention, a moving body having a high moving frequency among the plurality of moving bodies corresponds to the first light emitting unit, and a moving body having a low moving frequency among the plurality of moving bodies corresponds to the second light emitting unit. To do. In the above aspect, since the moving body having a high moving frequency corresponds to the first light emitting unit and the moving body having a low moving frequency corresponds to the second light emitting unit, the movement of the moving body having a high moving frequency is detected with high accuracy. However, it is possible to reduce the power consumption required for detecting the movement of a moving body having a low movement frequency.

In a preferred aspect of the present invention, the moving body is a key or a hammer of a keyboard instrument, and the moving body belonging to the first range of the musical range of the keyboard instrument corresponds to the first light emitting unit, and is located on the low-frequency side of the first range. The moving body that belongs to the second range or the third range on the treble side corresponds to the second light emitting unit. In the above aspect, the key pressing frequency in the second range on the low tone side of the first range or the key pressing frequency in the third range on the high tone side is lower than the key pressing frequency of the first range. While detecting movements with high accuracy, it is possible to reduce the power consumption required to detect movements for keys that are infrequently pressed.

A detection device according to a preferred aspect of the present invention calculates a frequency index, which is an index of a movement frequency of a moving body corresponding to a light emitting unit, for each of a plurality of light emitting units, and first calculates a frequency index of each light emitting unit. A frequency analysis unit for selecting the light emitting unit and the second light emitting unit is provided. In the above aspect, since each of the plurality of light emitting units is selected as the first light emitting unit or the second light emitting unit according to the frequency index of each light emitting unit, the light emitting unit actually moves in the usage target (for example, a keyboard musical instrument) of the detection device. It is possible to detect the movement of a moving body that has a high frequency of movement with high accuracy, and reduce the power consumption required for detecting the movement of a moving body that has a low frequency of movement.

In a preferred aspect of the present invention, the frequency analysis unit calculates the frequency index for each of the plurality of light emitting units by using the usage history regarding the plurality of moving bodies. In the above aspect, the frequency index of each light emitting unit is calculated by using the usage history of the plurality of moving bodies. Therefore, there is an advantage that the first light emitting portion and the second light emitting portion can be selected in consideration of the tendency of actual use.

It is a block diagram of the detection apparatus in 1st Embodiment of this invention. It is a schematic diagram of a detection part. It is explanatory drawing of operation|movement of a light emission control part. It is explanatory drawing of the relationship between each combination of a light-emitting part and a light-receiving part, and each key of a keyboard instrument. It is explanatory drawing of operation|movement of a light emission control part. It is a block diagram of the detection apparatus in 2nd Embodiment. It is explanatory drawing of the use history in 2nd Embodiment. It is a flow chart of frequency analysis processing in a 2nd embodiment. It is explanatory drawing of the drive of each light emitting part in 3rd Embodiment.

<First Embodiment>
FIG. 1 is a configuration diagram of a detection device 100 according to the first embodiment of the present invention. The detection device 100 of the first embodiment is a sensor used in a keyboard instrument to optically detect movement of each of a plurality of keys. As illustrated in FIG. 1, the detection device 100 of the first embodiment includes a control device 12, a storage device 14, an operation detection unit 16, a sound source circuit 20, and a sound emitting device 22.

The control device 12 is realized by a processing circuit such as a CPU (Central Processing Unit) or FPGA (Field Programmable Gate Array), and controls each element of the detection device 100 as a whole. The storage device 14 stores a program executed by the control device 12 and various data used by the control device 12. For example, a known recording medium such as a semiconductor recording medium or a magnetic recording medium, or a combination of a plurality of types of recording media can be used as the storage device 14.

The motion detection unit 16 is an element that detects the movement of each key of the keyboard instrument (specifically, the displacement of each key when the user presses a key), and the plurality of (M) light emitting units E[1] to It is provided with E[M], a plurality (N) of light receiving portions R[1] to R[N], and an A/D converter 24 (M and N are natural numbers of 2 or more). One arbitrary light emitting unit E[m] (m=1 to M) is configured to include a light emitting element such as an LED (Light Emitting Diode), and is supplied with a drive current to emit light (hereinafter, referred to as “detection”). It emits light. Any one light receiving unit R[n] (n=1 to N) is configured to include a light receiving element such as a photodiode, and generates a detection signal according to the light receiving level. The A/D converter 24 converts the analog detection signal generated by each of the N light receiving units R[1] to R[N] into digital data (hereinafter referred to as “detection data”) X.

The M light emitting portions E[1] to E[M] and the N light receiving portions R[1] to R[N] are sensors of vertical M rows×horizontal N columns (for example, 12 vertical rows×8 horizontal rows). A detection unit D[m,n] is arranged corresponding to a combination of an arbitrary one light emitting unit E[m] and an arbitrary one light receiving unit R[n] in a matrix. A plurality of keys of the keyboard musical instrument correspond to different detecting units D[m,n]. In FIG. 1, the detection unit D[m,n] is illustrated for convenience for all combinations of the light emitting units E[m] and the light receiving units R[n]. There are also combinations in which [m,n] is not placed. The correspondence between each combination of the light emitting portion E[m] and the light receiving portion R[n] (detecting portion D[m,n]) and each key will be described later.

FIG. 2 is a schematic view illustrating an arbitrary one detection unit D[m,n]. As illustrated in FIG. 2, any one detection unit D[m,n] is a sensor head including a light emitting path 162, a light guide 164, a light guide 166, a light receiving path 168, and a light shield 32. Is. The light emitting path 162 and the light receiving path 168 are paths through which the detection light propagates, and are configured to include, for example, an optical fiber. The detection light emitted from the light emitting portion E[m] propagates through the light emitting path 162, reaches the light guide body 164, and is emitted to the light guide body 166 side due to reflection inside the light guide body 164. The detection light that has entered the light guide body 166 from the light guide body 164 enters the light receiving path 168 due to reflection inside the light guide body 166, propagates through the light receiving path 168, and reaches the light receiving unit R[n]. The light shield 32 is, for example, a light-shielding shutter fixed to the bottom surface of each key 30 of the keyboard instrument, and moves between the light guide body 164 and the light guide body 166 in conjunction with the key depression by the user. Therefore, the light receiving level (detection data X) of each light receiving unit R[n] varies depending on the position of each key 30. That is, the detection data X is data that represents the position of each key 30 that fluctuates due to key depression.

In the light emission path 162 of each of the N detection units D[m,1] to [m,N] corresponding to the m-th row of the motion detection unit 16, the m-th one light emission unit E[m]. The detection light emitted from the detector is supplied in common and passed through the light receiving path 168 of each of the M detectors D[1,n] to D[M,n] corresponding to the nth row of the motion detector 16. The light is received by the nth light receiving unit R[n]. Therefore, by detecting the light receiving level of each of the N light receiving units R[1] to R[N] at the time of light emission of any one light emitting unit E[m], the light emitting unit E[m] and each light receiving unit E[m] are detected. It is possible to detect the operation of each key 30 (state of the detection unit D[m,n]) corresponding to the combination with the light receiving unit R[n]. Note that, as disclosed in, for example, Japanese Patent Laid-Open No. 9-152871, a configuration in which the detection light emitted from one light emitting unit E[m] is received by a plurality of light receiving units R[n], or a plurality of light emitting units E are used. A configuration in which the detection light emitted from [m] is received by one light receiving unit R[n] can also be adopted.

As illustrated in FIG. 1, the control device 12 of the first embodiment executes a program stored in the storage device 14 to execute a plurality of elements for controlling the operation detection unit 16 (the light emission control unit 42, It functions as the operation analysis unit 44). A configuration in which the function of the control device 12 is distributed to a plurality of devices, or a configuration in which a dedicated electronic circuit realizes a part of the function of the control device 12 is also adopted.

The light emission control unit 42 sequentially causes each of the M light emitting units E[1] to E[M] of the operation detection unit 16 to emit light. FIG. 3 is an explanatory diagram of an operation in which the light emission control unit 42 controls one arbitrary light emitting unit E[m]. As illustrated in FIG. 3, the light emission control unit 42 supplies a predetermined drive current Z to the light emitting unit E[m] at every predetermined period (hereinafter referred to as “detection period”) Q to cause the light emitting unit E to emit light. Make [m] emit light. The detection signal of each light receiving unit R[n] is A/D-converted within a period L[m] during which the light emitting unit E[m] emits light (hereinafter referred to as "light emitting period") (that is, light emission of the light emitting unit E[m]). The A/D converter 24 generates the detection data X of each key 30 by A/D converting the detection signal in synchronization with.

The operation analysis unit 44 of FIG. 1 detects the movement of the key 30 (that is, the player's key depression) from the time series of the detection data X of each key 30, and specifies the movement speed. The operation analysis unit 44 of the first embodiment sequentially generates performance data that specifies the pronunciation of a musical tone corresponding to the key 30 that has detected movement and the pronunciation intensity (velocity) according to the moving speed of the key 30. The performance data generated by the motion analysis unit 44 is sequentially supplied to the tone generator circuit 20. The tone generator circuit 20 generates an acoustic signal of a performance sound specified by the performance data. By supplying the sound signal generated by the sound source circuit 20 to the sound emitting device 22 (speaker or headphones), the performance sound specified by the performance data is reproduced. It should be noted that the musical performance data sequentially generated by the motion analysis unit 44 is stored in the storage device 14 and the automatic performance of the keyboard instrument is realized by driving each key 30 according to the performance data by a driving mechanism (for example, a solenoid). It is also possible to do so. Further, the control device 12 can realize the function of the tone generator circuit 20.

FIG. 4 illustrates the relationship between each combination of the light emitting unit E[m] and the light receiving unit R[n] and each key 30 of the keyboard instrument. In FIG. 4, the motion detector 16 includes twelve (M=12) light emitting units E[1] to E[12] and eight (N=8) light receiving units R[1] to R[8]. For the sake of convenience, the case where it is included is assumed. The numerical value described corresponding to the combination of the light emitting portion E[m] and the light receiving portion R[n] is the number of the key 30. The pitch gradually rises from the 1st key (key number = 1) to the 88th key (key number = 88) corresponding to the lowest pitch of the keyboard instrument, and the 88th key corresponds to the highest pitch of the keyboard instrument. .. The relationship between each combination of the light emitting portion E[m] and the light receiving portion R[n] and each key 30 of the keyboard instrument in FIG. 4 is an example. That is, the relationship between each combination of the light emitting unit E[m] and the light receiving unit R[n] and each key 30 is arbitrary, and various relationships can be actually adopted.

As illustrated in FIG. 4, the M light emitting units E[1] to E[M] are classified into a first light emitting unit EA and a second light emitting unit EB. The first light emitting unit EA is a light emitting unit E[m] corresponding to the key 30 having a high key pressing frequency, and the second light emitting unit EB is a light emitting unit corresponding to the key 30 having a low key pressing frequency. This is the section E[m]. For example, by collecting and analyzing music data representing a time series of a plurality of notes constituting a music piece and a performance sound of the music piece for a large number of existing music pieces, a general key pressing frequency for each key 30 (for example, for each key 30) The frequency distribution of the number of key presses) is aggregated. Then, the light emitting portion E[m] corresponding to the key 30 having a high key pressing frequency is selected as the first light emitting portion EA, and the light emitting portion E[m] corresponding to the key 30 having a low key pressing frequency emits the second light. Selected as Department EB.

FIG. 4 also shows the relationship between keyboard numbers (1st to 88th keys) and the frequency of key depression. As illustrated in FIG. 4, a total of fifteen keys 30 from the first key to the fifteenth key, which have a low frequency of key pressing, have a light emitting portion E[1] and a light emitting portion E[ selected as the second light emitting portion EB. 2], and a total of 15 keys 30 from the 74th key to the 88th key which are similarly infrequently pressed are the light emitting portion E[11] and the light emitting portion E[11] selected as the second light emitting portion EB. It is assigned to any of the parts E[12]. On the other hand, a total of 58 keys 30 from the 16th key to the 73rd key, which are frequently pressed, have eight keys from the light emitting portion E[3] to the light emitting portion E[10] selected as the first light emitting portion EA. Is assigned to any one of the light emitting portions E[m].

The keys 30 near both ends of the keyboard of the keyboard instrument tend to have a low frequency of key depression. In FIG. 4, the key pressing frequency of each key 30 in the range W1 (example of the first range) from the 16th key to the 73rd key in the range of the keyboard musical instrument is from the first key located on the low tone side of the range W1. The frequency of key depression of each key 30 in the range W2 up to the 15th key (example of the second range) and the range W3 from the 74th key to the 88th key located on the high pitch side of the range W1 (example of the third range) The key pressing frequency of each of the keys 30 is illustrated. Under the above assumptions, as illustrated in FIG. 4, each key 30 belonging to the range W1 corresponds to the first light emitting unit EA (E[3] to E[10]), and the range W2 of the bass range and Each key 30 belonging to the high-pitched range W3 corresponds to the second light emitting section EB (E[1], E[2], E[11], E[12]).

The light-emission control unit 42 differentiates the drive condition for causing the first light-emitting unit EA of the M light-emitting units E[1] to E[M] to emit light and the drive condition for causing the second light-emitting unit EB to emit light. In the first embodiment, the detection cycle Q for causing the light emitting unit E[m] to emit light is exemplified as the driving condition that makes the first light emitting unit EA and the second light emitting unit EB different. Specifically, as illustrated in FIG. 3, the light emission control unit 42 causes the second light emitting unit EB to emit light at a detection cycle Q longer than that of the first light emitting unit EA. That is, the time length q2 of the detection cycle Q in which the second light emitting section EB emits light is longer than the time length q1 of the detection cycle Q in which the first light emitting section EA emits light (q2>q1). FIG. 3 illustrates a configuration in which the time length q2 of the detection cycle Q of the second light emitting portion EB is twice the time length q1 of the detection cycle Q of the first light emitting portion EA. In other words, the frequency of light emission of the first light emitting unit EA (the number of times of light emission per unit time) exceeds the frequency of light emission of the second light emitting unit EB.

FIG. 5 is an explanatory diagram of an operation in which the light emission control unit 42 causes each of the M light emitting units E[1] to E[M] to emit light under the relationship illustrated in FIG. As illustrated in FIG. 5, each of the light emitting parts E[m] (E[3] to E[10]) selected as the first light emitting part EA emits light sequentially at every detection cycle Q of the time length q1. , The respective light emitting portions E[m] (E[1], E[2], E[11], E[12]) selected for the second light emitting portion EB are sequentially arranged at each detection cycle Q of the time length q2. It emits light. As can be understood from the above description, the operation of each key 30 corresponding to the first light emitting unit EA is detected with a higher time resolution than that of each key 30 corresponding to the second light emitting unit EB. The time length of the light emitting period L[m] is common to the first light emitting unit EA and the second light emitting unit EB.

As illustrated above, in the first embodiment, the first light emitting unit EA and the second light emitting unit EB are caused to emit light under different driving conditions. Therefore, it is possible to efficiently detect the movement of the plurality of keys 30 as compared with the configuration in which all the M light emitting units E[1] to E[M] emit light under a common drive condition.

For example, in the first embodiment, since the second light emitting section EB is caused to emit light at the detection cycle Q longer than that of the first light emitting section EA, the time resolution is secured for the detection of each key 30 corresponding to the first light emitting section EA. However, it is possible to reduce power consumption for detecting each key 30 corresponding to the second light emitting unit EB. Particularly in the first embodiment, the key 30 having a high key pressing frequency corresponds to the first light emitting unit EA, and the key 30 having a low key pressing frequency corresponds to the second light emitting unit EB. While the movement can be detected with high time resolution and high accuracy, there is an advantage that the movement of the key 30 having a low key pressing frequency can be detected while reducing the power consumption.

The first embodiment can also be applied to the detection of the motion of a hammer striking a string in conjunction with each key 30 in a keyboard instrument. For example, as understood from the example of FIG. 4, each hammer belonging to the range W1 corresponds to the first light emitting unit EA (E[3] to E[10]), and has a low range W2 and a high range W3. Each of the hammers belonging to the above corresponds to the second light emitting portion EB (E[1], E[2], E[11], E[12]).

<Second Embodiment>
A second embodiment of the present invention will be described. Note that, in each of the following exemplary embodiments, the elements having the same operations and functions as those in the first embodiment are given the same reference numerals as those used in the description of the first embodiment, and detailed description thereof will be appropriately omitted. In the first embodiment, the key 30 having a high key pressing frequency is associated with the first light emitting unit EA, but in the second embodiment, the light emitting unit E[m] is irrespective of the key pressing frequency of each key 30. It is assumed that the key and the key 30 are associated with each other.

FIG. 6 is a configuration diagram of the detection device 100 according to the second embodiment. As illustrated in FIG. 6, the control device 12 of the detection device 100 in the second embodiment functions as a frequency analysis unit 46 in addition to the same elements (light emission control unit 42, operation analysis unit 44) as those in the first embodiment. To do. The frequency analysis unit 46 calculates the frequency index F[m] (F[1] to F[M]) for each of the M light emitting units E[1] to E[M] of the motion detection unit 16. The frequency index F[m] of any one light emitting unit E[m] is a key pressing frequency index for the plurality of keys 30 corresponding to the light emitting unit E[m].

The frequency analysis unit 46 of the second embodiment utilizes the usage history H in which the past tendency of key depression of the keyboard instrument is recorded, and the frequency index of each of the M light emitting units E[1] to E[M]. Calculate F[m]. As illustrated in FIG. 7, the usage history H is a record of the number of times each key 30 has been depressed (hereinafter referred to as “the number of times of key depression”) K, and is stored in the storage device 14 in a nonvolatile manner. For example, every time the motion analysis unit 44 detects the pressing of one arbitrary key 30, the key press count K of the key 30 in the usage history H is incremented by one. For example, the number of times K of pressing each key 30 over a predetermined time in the past and the number K of pressing times of each key 30 from the first use of the keyboard instrument are recorded in the usage history H.

For each of the M light emitting units E[1] to E[M], the frequency analysis unit 46 of FIG. 6 presses the keys 30 corresponding to the light emitting units E[m] recorded in the usage history H. A representative value (for example, an average value or a median value) or a total value of the key count K is calculated as a frequency index F[m]. For example, when a total of eight keys 30 from the first key to the eighth key correspond to one arbitrary light emitting unit E[m], the frequency analyzing unit 46 determines that each of the first to eighth keys The frequency index F[m] is calculated by averaging the number K of times the key 30 is pressed (F[m]=(K1+K2+...+K8)/8). Therefore, the frequency index F[m] is set to a larger numerical value as the frequency of key depression of the plurality of keys 30 corresponding to the light emitting unit E[m] is higher.

The frequency analysis unit 46 sets each of the M light emitting units E[1] to E[M] according to the frequency index F[m] of each light emitting unit E[m] to the first light emitting unit EA and the second light emitting unit. Classify as EB. Specifically, the frequency analysis unit 46 sets the light emitting unit E[m] (that is, the light emitting unit E[m] corresponding to the key 30 having a high key pressing frequency) whose frequency index F[m] exceeds a predetermined threshold FTH. The second light emitting unit is selected as the first light emitting unit EA, and the light emitting unit E[m] whose frequency index F[m] is less than the threshold FTH (that is, the light emitting unit E[m] corresponding to the key 30 having a low key pressing frequency) is used. Select EB. As can be understood from the above description, in the above-described first embodiment, the first light emitting unit EA and the second light emitting unit EB are selected in advance in accordance with the general tendency of the frequency of key depressions in an unspecified number of songs. On the other hand, in the second embodiment, each light emitting unit E[m] is dynamically selected as either the first light emitting unit EA or the second light emitting unit EB according to the usage history H of the keyboard instrument. It

The first embodiment is similar to the first embodiment in that the driving condition by the light emission control unit 42 is different between the first light emitting unit EA and the second light emitting unit EB. Specifically, the light emission control unit 42 causes the second light emitting unit EB to emit light at a detection cycle Q longer than that of the first light emitting unit EA. Therefore, also in the second embodiment, as in the first embodiment, a plurality of keys are provided as compared with the configuration in which all the M light emitting units E[1] to E[M] emit light under a common drive condition. It is possible to detect movement of 30 efficiently.

FIG. 8 is a flowchart of a process (hereinafter, referred to as “frequency analysis process”) in which the frequency analysis unit 46 of the second embodiment selects the first light emitting unit EA and the second light emitting unit EB according to the key pressing frequency of each key 30. Is. For example, the frequency analysis process of FIG. 8 is executed immediately after the user instructs to turn on or turn off the power of the detection device 100.

When the frequency analysis process is started, the frequency analysis unit 46 selects any of the M light emitting units E[1] to E[M] (hereinafter referred to as "target light emitting unit E[m]") (SA1). The frequency analysis unit 46 searches the usage history H for the number of key presses K of each of the plurality of keys 30 corresponding to the target light-emitting unit E[m] (SA2), and based on the number of key presses K of the plurality of keys 30, the frequency index. Calculate F[m] (SA3).

The frequency analysis unit 46 determines whether the frequency index F[m] of the target light emitting unit E[m] exceeds the threshold value FTH (SA4). When the frequency index F[m] exceeds the threshold value FTH (SA4: YES), the frequency analysis unit 46 selects the target light emitting unit E[m] as the first light emitting unit EA (SA5). On the other hand, when the frequency index F[m] is less than the threshold value FTH (SA4: NO), the frequency analysis unit 46 selects the target light emitting unit E[m] as the second light emitting unit EB (SA6). The frequency index F[m] is calculated for each of the M light emitting units E[1] to E[M] by sequentially repeating the above processing (SA1 to SA6) (SA7: NO).

As described above, in the second embodiment, each of the M light emitting units E[1] to E[M] is the first light emitting unit according to the frequency index F[m] of each light emitting unit E[m]. EA or the second light emitting unit EB. Therefore, the movement of the key 30 that is frequently used in the keyboard instrument can be detected with high accuracy, while the movement of the key 30 that is rarely used in the keyboard instrument can be detected while reducing the power consumption. It is possible to Particularly in the second embodiment, since the frequency index F[m] of each light emitting unit E[m] is calculated by using the usage history H in which the number of key depressions K of each key 30 is recorded, the frequency index F[m] of each keyboard instrument is calculated. There is also an advantage that the first light emitting unit EA and the second light emitting unit EB can be selected in consideration of the tendency of the user to depress the keys.

In the above description, the usage history H, which records the number K of key presses for each key 30, is used to calculate the frequency index F[m], but the frequency index F[m] of each light emitting unit E[m] is used. The calculation method is not limited to the above examples. For example, with reference to music data of a musical composition designated by the user of the keyboard instrument (for example, data representing time series of musical notes of musical composition or performance sound of musical composition) or music data stored in the storage device 14, performance of the musical composition is performed. It is also possible to total the number K of times the key is pressed for each key 30 and calculate the frequency index F[m] of each light emitting unit E[m] from the totaled result. It is also possible to generate and record the usage history H for each user, and to distinguish between the first light emitting unit EA and the second light emitting unit EB for each user who actually plays the keyboard instrument.

<Third Embodiment>
In the first and second embodiments, the detection cycle Q is different between the first light emitting unit EA and the second light emitting unit EB. In the third embodiment, the mode (specifically, the waveform) of the drive current Z supplied to the light emitting unit E[m] within the light emitting period L[m] is set to the first light emitting unit EA and the second light emitting unit EB. Make a difference. The correspondence between each combination of the light emitting portion E[m] and the light receiving portion R[n] and each key 30, and each light emitting portion E[m] is selected as the first light emitting portion EA or the second light emitting portion EB. The conditions are the same as in the first or second embodiment.

FIG. 9 is an explanatory diagram of an operation in which the light emission control unit 42 causes each of the M light emitting units E[1] to E[M] to emit light in the third embodiment. The light emission control unit 42 sequentially causes each of the M light emitting units E[1] to E[M] to emit light by supplying the drive current Z in the light emitting period L[m]. As illustrated in FIG. 9, the light emission control unit 42 of the third embodiment maintains the drive current Z at a predetermined current within the light emission period L[m] for the second light emission unit EB, and the first light emission unit EA. For, the drive current Z is changed stepwise within the light emission period L[m]. Specifically, the drive current Z supplied to the first light emitting unit EA changes from the current z1 to the current z2 within the light emitting period L[m]. In addition, although the case where the current z2 exceeds the current z1 is illustrated in FIG. 9, a configuration in which the current z2 is lower than the current z1 is also adopted. As illustrated in FIG. 9, the light emitting period L[m] of the second light emitting unit EB is shorter (for example, half) than the light emitting period L[m] of the first light emitting unit EA. In the third embodiment, the detection cycle Q is common to the first light emitting section EA and the second light emitting section EB.

The A/D converter 24 of the operation detecting unit 16 performs A/D conversion on the detection signal of each light receiving unit R[n] within the light emitting period L[m] of the light emitting unit E[m] to convert each key 30. The detection data X is generated. Specifically, in the light emission period L[m] of the second light emitting unit EB, one detection data X corresponding to the detection signal of the light receiving unit R[n] is generated for each light receiving unit R[n]. On the other hand, in the light emission period L[m] of the first light emitting unit EA, as illustrated in FIG. 9, the detection data X1 corresponding to the detection signal when the current z1 is supplied and the detection signal when the current z2 is supplied are responded to. The detection data X2 is generated by the A/D converter 24 for each light receiving unit R[n].

The operation analysis unit 44 of the third embodiment detects the movement of each key 30 corresponding to the second light emitting unit EB by analyzing the detection data X generated in the light emitting period L[m] of the second light emitting unit EB. To analyze. Further, the operation analysis unit 44 selects either the detection data X1 or the detection data X2 generated in the light emission period L[m] of the first light emitting unit EA for each light receiving unit R[n] and selects each key 30. Analyze the movement of. Here, the relationship between the current supplied to the light emitting unit E[m] and the signal level of the detection signal generated by the light receiving unit R[n] when the current is supplied is due to, for example, manufacturing error or deterioration over time. , Even if all the keys 30 are released, the light receiving units R[n] may differ. In consideration of the above tendency, the operation analysis unit 44 of the third embodiment causes the light receiving unit R[n] of the detection data X1 and the detection data X2 to receive light during the light emitting period L[m] of the first light emitting unit EA. A larger one is selected for each light receiving unit R[n] in a range where the level is not saturated (for example, a range where the light receiving level is below a predetermined threshold).

As understood from the above description, regarding the first light emitting unit EA, the drive current Z and the detection signal supplied to the light emitting unit E[m] are changed by changing the drive current Z within the light emitting period L[m]. The error in the relation with the signal level of (the difference between the N light receiving units R[1] to R[N]) is reduced. Therefore, the movement of each key 30 corresponding to the first light emitting unit EA can be detected with high accuracy. On the other hand, since the drive current Z of the second light emitting portion EB is maintained within the light emitting period L[m], the second light emitting portion EB is also compared with the configuration in which the drive current Z is changed within the light emitting period L[m]. Therefore, there is an advantage that power consumption is reduced. Further, with respect to the second light emitting section EB, there is also an advantage that the detection data X can be generated in a short time as compared with the light emitting period L[m] of the first light emitting section EA. That is, also in the third embodiment, it is possible to efficiently detect the movement of the plurality of keys 30.

<Modification>
Each of the above forms can be variously modified. Specific modes of modification will be exemplified below. Two or more aspects arbitrarily selected from the following examples can be appropriately merged.

(1) In each of the above-described embodiments, each light emitting unit E[m] is set to either the first light emitting unit EA or the second light emitting unit EB, but M light emitting units E[1] to E[M] are set. It is also possible to divide each of the above into three or more. For example, each light emitting unit E[m] is divided into a first light emitting unit EA (key pressing frequency: high), a second light emitting unit EB (key pressing frequency: medium), and a third light emitting unit EC (key pressing frequency: low). A configuration is assumed in which the driving conditions are different for the first light emitting unit EA, the second light emitting unit EB, and the third light emitting unit EC. For example, the second light emitting unit EB is driven with a longer detection period Q than the first light emitting unit EA, and the third light emitting unit EC is longer than the second light emitting unit EB in the detection period Q (for example, with the time length q1). 3 times). As can be understood from the above description, the M light emitting units E[1] to E[M] may include other than the first light emitting unit EA and the second light emitting unit EB.

(2) In the second embodiment, each light emitting unit E[m] is defined as a frequency index F[m] using the representative value or the total value of the number of key presses K over the plurality of keys 30 corresponding to each light emitting unit E[m]. The light-emitting section E[m] is divided into the first light-emitting section EA and the second light-emitting section EB. It is also possible to divide into the light emitting portion EB.

For example, the moving speed (for example, the past average value) V specified by the motion analysis unit 44 is recorded in the usage history H for each key 30 together with the number of key depressions K. The moving speed V can also be referred to as the pronunciation intensity (velocity) as described above. The frequency analysis unit 46 calculates the representative value or the total value of the number of key presses K as the frequency index F[m] for each light emitting unit E[m] as in the second embodiment, and the light emitting unit E[m] is calculated. A representative value (for example, an average value) of the moving speed V recorded in the usage history H for the corresponding plurality of keys 30 is calculated for each light emitting unit E[m]. Similar to the second embodiment, the frequency analysis unit 46 selects the light emitting unit E[m] whose frequency index F[m] is less than the threshold FTH as the second light emitting unit EB. The operation of causing the light emission control section 42 to emit light from the second light emitting section EB at the detection cycle Q of the time length q2 is the same as in the first and second embodiments.

Further, the frequency analysis unit 46, for the light emitting unit E[m] whose frequency index F[m] exceeds the threshold value FTH, when the representative value of the moving speed V exceeds the predetermined threshold value VTH (that is, it is struck with high frequency). The light emitting unit E[m] of the key 30 having a tendency and the frequency analyzing unit 46 select the light emitting unit E[m] as the first light emitting unit EA, as in the second embodiment. The light emission control unit 42 sequentially causes the first light emitting unit EA to emit light at the detection cycle Q of the time length q1. On the other hand, for the light emitting part E[m] whose frequency index F[m] exceeds the threshold value FTH, when the representative value of the moving speed V is lower than the predetermined threshold value VTH (that is, the key 30 which is apt to be hit with high frequency 30). The light emitting unit E[m]) and the frequency analyzing unit 46 select the light emitting unit E[m] as the third light emitting unit EC. For the key 30 that the user tends to tap, it is necessary to prioritize the position detection accuracy (position resolution) of the key 30 over the time resolution. Therefore, the light emission control unit 42 causes the third light emitting unit EC to emit light by supplying the drive current Z that fluctuates within the light emission period L[m] as illustrated in the third embodiment. Therefore, it is possible to detect the position of each key 30 corresponding to the third light emitting unit EC with high accuracy. That is, it is possible to detect the movement of each key 30 that is apt to be struck with high frequency with high time resolution, while detecting the position of each key 30 that is apt to be struck with high frequency with high accuracy. .. It is preferable that the third light emitting unit EC emits light in the detection cycle Q having the time length q2, but it is also possible to emit the light in the detection period Q having the time length q1.

(3) In the third embodiment, the drive current Z supplied to the first light emitting portion EA is changed in two steps (z1, z2) within the light emitting period L[m], but is supplied to the first light emitting portion EA. It is also possible to change the drive current Z to be performed in three or more steps within the light emission period L[m].

(4) In the first to third embodiments, the detection of the movement of each key 30 of the keyboard instrument is illustrated. However, the configuration illustrated in the first to third embodiments is applied to each hammer of the keyboard instrument. The same can be applied to the detection of motion. Further, the same configuration as each of the above-described modes can be used for detecting the operation of each of a plurality of operators (for example, buttons and knobs) that can be operated by the user. As can be understood from the above examples, the target of detection by the detection device 100 (for example, the key 30, the hammer, the operator) is comprehensively expressed as a movable moving body.

(5) The detection device 100 exemplified in each of the above-described embodiments is realized by the cooperation of the control device 12 and the program as described above. The program according to the preferred embodiment of the present invention is applied to different combinations of each of the M light emitting parts E[1] to E[M] and each of the N light receiving parts R[1] to R[N]. Operation of generating detection data X indicating the light receiving level of the light receiving unit R[n] that varies depending on the position of the corresponding moving body when the light emitting unit E[m] emits light, for each corresponding moving body (for example, the key 30). A program that causes a computer (for example, the control device 12) capable of controlling the detection unit 16 to function as a light emission control unit 42 that sequentially emits light from each of the M light emitting units E[1] to E[M]. The control unit 42 causes the driving condition for causing the first light emitting unit EA of the M light emitting units E[1] to E[M] to emit light, and causes the second light emitting unit EB different from the first light emitting unit EA to emit light. Different from the driving condition.

The programs exemplified above may be provided in a form stored in a computer-readable recording medium and installed in the computer. The recording medium is, for example, a non-transitory recording medium, and an optical recording medium (optical disk) such as a CD-ROM is a good example, but any known recording medium such as a semiconductor recording medium or a magnetic recording medium is used. The recording medium of this type may be included. It is also possible to distribute the program to the computer in the form of distribution via a communication network.

(6) The preferred aspect of the present invention can be specified as an operation method (detection method) of the detection device 100 exemplified in each of the above-described embodiments. A detection method according to a preferred embodiment of the present invention is a combination of M light emitting portions E[1] to E[M] and N light receiving portions R[1] to R[N] different from each other. The detection data X indicating the light receiving level of the light receiving unit R[n] that changes according to the position of the moving body when the light emitting unit E[m] emits light is generated for each moving body (for example, the key 30) corresponding to. A computer (for example, the control device 12) capable of controlling the operation detection unit 16 functions as a light emission control unit 42 that sequentially emits light from each of the M light emitting units E[1] to E[M], while Among the light emitting units E[1] to E[M], the driving condition for causing the first light emitting unit EA to emit light is different from the driving condition for causing the second light emitting unit EB different from the first light emitting unit EA to emit light.

100... Detection device, 12... Control device, 14... Storage device, 16... Motion detection unit, E[m]... Light emitting unit, R[n]... Light receiving unit, 20... Sound source circuit, 22... Sound emitting device, 24... A/D converter, 30... Key, 32... Shading body, 42... Emission control section, 44... Operation analysis section, 46... Frequency analysis section.

Claims (7)

For each moving body corresponding to a different combination of each of the plurality of light emitting units and each of the plurality of light receiving units, a light receiving level of the light receiving unit that varies according to the position of the moving body when the light emitting unit emits light is set. An operation detection unit that generates the detection data shown,
A light emission control unit for sequentially emitting light from each of the plurality of light emitting units,
The light emission control unit includes a period for emitting the first light emitting portion the frequency of movement corresponding to high mobile among the plurality of light emitting portions to emit a second light emitting unit frequency of movement corresponding to the lower moving body A detector that makes the cycle different. For each moving body that corresponds to a different combination of each of the plurality of light emitting units and each of the plurality of light receiving units, the light receiving level of the light receiving unit that varies according to the position of the moving body when the light emitting unit emits light is set. An operation detection unit that generates the detection data shown,
A light emission control unit that sequentially emits light from each of the plurality of light emitting units by supplying a drive current during a light emitting period ,
The light emission control unit changes the drive current to a plurality of currents within the light emission period for the first light emitting unit corresponding to the moving body having a high frequency of movement among the plurality of light emitting units, and moves the drive current having a low frequency of movement. A detection device that maintains a constant drive current within the light emission period for the second light emission unit corresponding to the body . The moving body is a key or hammer of a keyboard instrument,
The moving body belonging to a first range of the range of the keyboard instrument corresponds to the first light emitting unit, and the moving body belonging to the second range on the low tone side or the third range on the high tone side of the first range is the detection device according to claim 1 or claim 2 corresponding to the second light-emitting portion. A frequency index, which is an index of the movement frequency of the moving body corresponding to the light emitting unit, is calculated for each of the plurality of light emitting units, and the first light emitting unit and the second light emitting unit are calculated according to the frequency index of each of the light emitting units. The detection device according to claim 1 or 2 , further comprising a frequency analysis unit that selects a unit. The detection device according to claim 4 , wherein the frequency analysis unit calculates the frequency index for each of the plurality of light emitting units by using a usage history regarding the plurality of moving bodies. For each moving body that corresponds to a different combination of each of the plurality of light emitting units and each of the plurality of light receiving units, the light receiving level of the light receiving unit that varies according to the position of the moving body when the light emitting unit emits light is set. A program capable of causing a computer capable of controlling an operation detection unit that generates detection data to function as a light emission control unit that sequentially emits light from each of the plurality of light emitting units,
The light emission control unit includes a period for emitting the first light emitting portion the frequency of movement corresponding to high mobile among the plurality of light emitting portions to emit a second light emitting unit frequency of movement corresponding to the lower moving body A program that makes the cycle different. For each moving body that corresponds to a different combination of each of the plurality of light emitting units and each of the plurality of light receiving units, the light receiving level of the light receiving unit that varies according to the position of the moving body when the light emitting unit emits light is set. A program that causes a computer capable of controlling an operation detection unit that generates detection data to function as a light emission control unit that sequentially causes each of the plurality of light emission units to emit light by supplying a drive current in a light emission period ,
The light emission control unit changes the drive current to a plurality of currents within the light emission period for the first light emitting unit corresponding to the moving body having a high frequency of movement among the plurality of light emitting units, and moves the drive current having a low frequency of movement. A program for maintaining a constant drive current within the light emission period for the second light emission unit corresponding to the body .

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