JPH0743589B2 - Electronic percussion instrument - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electronic percussion instrument that emits a sound source such as a music synthesizer by striking a striking surface called a pad. Electronic percussion instrument with improved separation.

(Prior Art) Recently, a hitting surface called a pad is provided, and a sensor for detecting vibration is provided on the hitting surface, and the strength of hitting and hitting the pad is detected by the sensor to generate a sound source such as a music synthesizer. There is an electronic percussion instrument that produces sound.

For example, in Japanese Patent Laid-Open No. 58-118699, a plurality of pads, a sensor and a sound source corresponding to each pad are provided in the same housing, and when an arbitrary pad is struck, the sound source corresponding to the pad emits sound. An electronic percussion instrument is disclosed.

(Problems to be Solved by the Invention) In the above example, when an arbitrary pad is hit, its vibration propagates in the housing, causing other pads to vibrate and sounds other than those intended by the player are also produced. Therefore, each pad has a structure that mechanically isolates the propagation of vibration.

However, such mechanical means cannot completely insulate the propagation of vibrations, and when struck hard, an unintended sound may still be generated.

Therefore, if a more complete insulation is attempted by using mechanical means, the structure becomes complicated and the cost is inevitably high.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the characteristic of the electronic percussion instrument according to the present invention is that the vibrations respectively generated on a plurality of striking surfaces are detected and the vibrations are detected. In an electronic percussion instrument for generating a sound source driving signal, (a) a striking detecting means for detecting vibrations respectively generated on the striking surfaces, and (b) corresponding to a first striking surface detected by the striking surface detecting means. Comparing means for calculating the difference or ratio between the detected value and the detected value corresponding to the second striking surface; and (c) corresponding to the first striking surface corresponding to the difference or ratio calculated by the comparing means. And a control means for controlling the sound source driving signal so that it does not sound.

(Operation) According to the present invention, the intensities of the hits detected by the sensors are compared with each other, and it is determined whether or not the output of the sensor is caused by the propagation of the vibration due to the hit to another pad, and The pad separation can be improved.

(Example) Next, a specific example of the electronic percussion instrument according to the present invention will be described.
A description will be given with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of an electronic percussion instrument according to the present invention.

In the figure, 1 is a hit detection unit corresponding to the pad,
It comprises a sensor 10 for converting mechanical vibration of a pad (not shown) into an electric signal, and an envelope detector 11 for detecting an envelope of the electric signal.

The hit detection unit 1 is provided independently for each pad, and the number of pads is four in this embodiment.

The outputs of these batting detectors are guided to the analog multiplexer 2 and the CPU 4 switches the multiplexers 2, whereby the outputs of the batting detectors are sequentially output to the A / D converter 3.
Is converted into a digital value by and the CPU 4 reads this value.

Reference numeral 5 denotes a sound source, which is provided individually for each pad. Various types of sound sources are known, and the description thereof is omitted here because it is not related to the gist of the present invention.

Next, a processing method of the CPU 4 of the electronic percussion instrument according to the present invention will be described.

The CPU 4 is internally provided with a memory corresponding to each impact detection unit. If the A / D converter 3 has an 8-bit precision, each of the above memories has 1 byte, and in FIG. 1, a total of 4 bytes of memory is provided.

The CPU 4 periodically performs processing for each hit detection unit according to the flowchart shown in FIG.

Explaining with the flowchart below, the CPU 4 switches the multiplexer 2 in step SP1, guides the output of the hit detection unit to the A / D converter 3 in order, reads it as a digital value, and stores it in the memory corresponding to each pad.

Therefore, the value stored in the previous cycle disappears and is replaced with new data.

If the digital value corresponding to the impact strength read by the CPU 4 exceeds a predetermined threshold value, the read value is compared with the value stored in another memory in step SP2.

Therefore, if the read value is smaller than the value stored in the memory corresponding to the other pad, the ratio or difference between the value of the memory corresponding to the other pad and the read value is calculated, and the ratio or When the difference is larger than the predetermined value, it is determined that the read value is obtained because the vibration of the impact on the other pad propagates, and the sound source corresponding to the read value is not sounded.

When the ratio or difference is smaller than a predetermined value, the sound source is sounded.

The above-mentioned predetermined value differs depending on the degree of mechanical vibration propagation, and its optimum value is obtained by experiment.

However, in the above, if the value read by the CPU 4 is larger than the value stored in the memory corresponding to another pad,
It goes without saying that the sound source corresponding to the read value is sounded.

(Effects of the Invention) According to the present invention, as described above, in an electronic percussion instrument having a plurality of pads in the same housing and provided with a sensor and a sound source corresponding to each pad, vibration of other pads By mechanically electrically detecting the mechanical propagation and comparing it with the detection output of the pad that has been hit, only the pad that is truly hit can be detected and sounded.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing an embodiment of an electronic percussion instrument according to the present invention, and FIG. 2 is a flowchart of processing performed by a CPU of the electronic percussion instrument according to the present invention. 1 ... hit detection unit, 2 ... analog multiplexer,
3 ... A / D converter, 4 ... CPU, 5 ... Sound source, 10 ... Sensor, 11 ... Envelope detector.

Claims (1)

[Claims] 1. An electronic percussion instrument which detects vibrations respectively generated on a plurality of striking surfaces and generates a sound source driving signal corresponding to the striking surfaces where the vibrations are detected. Striking detection means for detecting vibration, and (b) comparison means for calculating the difference or ratio between the detection value corresponding to the first striking surface and the detection value corresponding to the second striking surface detected by the striking detection means. And (c) control means for controlling the sound source drive signal corresponding to the first striking surface so as not to generate sound, corresponding to the difference or ratio calculated by the comparison means, and an electronic percussion instrument.