JP2694418B2 - Electronic percussion instrument - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic percussion instrument detecting device, and more particularly to a music synthesizer by striking a striking surface generally called a pad. The present invention relates to a detection device for an electronic percussion instrument that emits a sound source such as. In recent years, a striking surface called a pad has been provided,
There is a known electronic percussion instrument that is equipped with a sensor that detects vibrations on the striking surface, detects the presence or absence of striking on the pad and the strength of the striking with this sensor, and produces a sound source such as a music synthesizer based on the detection of the sensor. Has been. As such an electronic percussion instrument, for example, there is an electronic percussion instrument disclosed in Japanese Unexamined Patent Publication No. 58-18699, and in this Japanese Unexamined Patent Publication No. 58-18699, a plurality of pads are respectively provided in the same housing. An electronic percussion instrument is disclosed in which a sensor and a sound source corresponding to the pad are provided, and when the arbitrary pad is hit, the sound source corresponding to the pad is sounded. However, in the above-mentioned conventional electronic percussion instrument, when an arbitrary pad is struck, its vibration propagates in the housing and vibrates other pads as well. Since a sound other than the intended sound may be produced, each pad has a structure that mechanically isolates the propagation of vibration. However, such a mechanical means cannot completely insulate the propagation of vibration, and there is a problem that an unintended sound may be generated when the pad is struck. . [0007] Further, if it is attempted to insulate more completely by using mechanical means, there is a problem that the structure must be complicated and the cost is increased. The present invention has been made in view of the above-mentioned various problems of the prior art, and an object of the present invention is to prevent unnecessary sound generation due to propagation of vibration of a hit pad. It is intended to provide an electronic percussion instrument which is prevented without increasing the cost. In order to achieve the above object, an electronic percussion instrument according to the present invention has a plurality of striking surfaces in the same housing, and detects vibrations generated on the striking surfaces, In an electronic percussion instrument that is made to emit a sound source corresponding to the striking surface in which vibration is detected, striking detection means that is provided on each of the striking surfaces and that outputs an electrical signal corresponding to the vibration state of the striking surface, respectively. Converting means for converting the electric signals respectively output from the hitting detecting means into digital values and outputting the digital values; first comparing means for comparing the digital values output from the converting means with a threshold value; Second comparing means for comparing a ratio or a difference between a digital value determined to be larger than the threshold value by the comparing means and another digital value corresponding to the striking surface with a predetermined value,
Based on the comparison result of the second comparing means, there is provided control means for controlling the sound generation of the sound source corresponding to the plurality of striking surfaces. According to the present invention, the ratio or difference between the digital value judged to be larger than the threshold value by the first comparing means and another digital value corresponding to the striking surface is different from each other. Based on the comparison result by comparing with a predetermined value, the control means determines whether the vibration of a certain striking surface is caused by the propagation of the vibration based on the striking to another striking surface, and controls the sound generation of the sound source. By doing so, it is possible to eliminate the influence of vibration propagation on each striking surface, significantly improve the isolation and independence of each striking surface, and prevent unnecessary pronunciation due to vibration propagation on other striking surfaces. become. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A detection device for an electronic percussion instrument according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of an electronic percussion instrument detecting apparatus according to the present invention. In FIG. 1, reference numeral 1 is a striking detection unit corresponding to a pad which is a striking surface, a sensor 10 for converting mechanical vibration of a pad (not shown) into an electric signal, and an envelope of the electric signal converted by the sensor 10. It is composed of an envelope detector 11 for detecting a line. The hit detection section 1 is provided independently for each pad, and the number of pads is four in this embodiment. These impact detectors 1, 1 ', 1'',
The output of 1 ″ ′ is led to the analog multiplexer 2. Then, the CPU 4 switches the analog multiplexer 2 so that the hit detection units 1, 1 ′,
The outputs of 1 ″ and 1 ′ ″ are sequentially converted into digital values by the A / D converter 3, and the CPU 4 reads the digital values. Reference numeral 5 is a sound source, and each sound source 5, 5 ',
5 ″ and 5 ′ ″ are the hit detection units 1, 1 ′, 1 ″,
It is provided corresponding to each 1 ''. Various sound sources are known and are not the gist of the present invention, so a detailed description thereof will be omitted. Next, a processing method of the CPU 4 of the electronic percussion instrument detecting apparatus according to the present invention will be described. The CPU 4 is internally provided with each impact detection unit 1,
A memory corresponding to 1 ', 1'', and 1''' is provided. 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 are provided. The CPU 4 periodically receives the impact detection units 1,
For 1 ′, 1 ″, and 1 ″ ′, processing is performed according to the flowchart shown in FIG. Explaining below with reference to the flow chart shown in FIG. 2, the CPU 4 switches the analog multiplexer 2 in step SP1 so that the impact detection units 1,
The outputs of 1 ′, 1 ″, and 1 ″ ′ are sequentially guided to the A / D converter 3, read as digital values, and stored 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 obtained, and the ratio or difference is obtained. Is larger than a predetermined value, it is judged that the read value is obtained because the vibration of the impact on another pad propagates, and the sound source corresponding to the read value is not sounded. When the ratio or difference is smaller than the predetermined value, the sound source corresponding to the read value is sounded. The predetermined value depends on the degree of mechanical vibration propagation, and the optimum value is obtained by experiment. Of course, in the above description, if the value read by the CPU 4 is larger than the value stored in the memory corresponding to another pad, the sound source corresponding to the read value is of course generated. Since the present invention is constructed as described above, it has the following effects. The ratio or difference between the digital value judged by the first comparing means to be larger than the threshold value and the other digital value corresponding to the striking surface is compared with a predetermined value,
Since the sound source of the sound source is controlled according to the comparison result, in an electronic percussion instrument having a plurality of pads in the same housing, the mechanical propagation of vibration of other pads is electrically detected and the pad hit By performing a comparison process with the detection output of, it is possible to easily determine that only the pad that has been truly hit is detected, and it is possible to realize an electronic percussion instrument that is extremely preferable for playing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit configuration diagram showing an embodiment of a detection device for an electronic percussion instrument according to the present invention. FIG. 2 is a flowchart of processing performed by a CPU of an electronic percussion instrument according to the present invention. [Explanation of Codes] 1, 1 ′, 1 ″, 1 ′ ″ Impact detection unit 2 Analog multiplexer 3 A / D converter 4 CPU 5, 5 ′, 5 ″, 5 ″ ′ Sound source 10 Sensor 11 Envelope detector

   ────────────────────────────────────────────────── ─── Continuation of front page    (56) Reference JP-A-58-118699 (JP, A)                 JP 58-169192 (JP, A)                 Actual development Sho 56-96497 (JP, U)                 JP-B-59-837 (JP, B2)

Claims (1)

(57) [Claims] An electronic percussion instrument having a plurality of striking surfaces in the same housing, detecting vibrations generated on the striking surfaces, and generating a sound source corresponding to the striking surfaces where the vibrations are detected. A striking detection unit that is provided and outputs an electric signal corresponding to the vibration state of the striking surface, a conversion unit that converts the electric signal output from the striking detection unit into a digital value and outputs the digital value, and the conversion unit. First comparing means for comparing a digital value output from the means with a threshold value, a digital value determined by the first comparing means to be greater than the threshold value, and another digital value having a corresponding striking surface different from each other. A second comparing means for comparing the ratio or difference of the two with a predetermined value, and a controller for controlling the sound generation of the sound source corresponding to the plurality of striking surfaces based on the comparison result of the second comparing means. Electronic percussion instrument characterized in that it comprises and.