Electronic musical instrument

• US 4,174,649 A
• Filed: 10/17/1977
• Issued: 11/20/1979
• Est. Priority Date: 10/17/1977
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
• Original Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
• Inventors: Watanabe, Hironori, Hashizume, Hikaru, Ezawa, Sadaaki, Kondo, Tatsunori, Sakashita, Noriji, Kugisawa, Toshio, Obayashi, Nobuharu, Kameyama, Seiji, Washiyama, Yutaka
• Primary Examiner(s): Witkowski, Stanley J.
• Application Number:
  US05/842,523
• Time in Patent Office: 764 Days
• Field of Search: 84/1.01
• US Class Current: 84/606
• CPC Class Codes: G10H 7/00 Instruments in which the tones are synthesised from a data store, e.g. computer organs

Abstract

An electronic musical instrument which has a key assignor or assignors of one or more channels for generating and temporarily storing key code corresponding to key depression and release, respectively, a memory for storing waveshape information such as inclination and amplitude variations of a required musical waveshape divided into a plurality of periods so as to read out the waveshape information corresponding to the key code, a plurality of tone source devices, each including waveshape generators of different sound ranges respectively corresponding to keyboard switches in the same channel of each key assignor, the tone source device reading out the waveshape information from the memory on a time divided basis to generate from the waveshape generators waveshapes of different frequencies based on the read out waveshape information, and means for simultaneously actuating the corresponding waveshape generators by the key code from the key assignor and coupler information.

Claims

1. An electronic musical instrument having a keyboard with a plurality of keys, comprising:

a key assignor for generating and temporarily storing a key code corresponding to the depression and release of a key, respectively,

a memory circuit for storing inclination and amplitude variations of a required musical waveshape divided into a plurality of periods for reading out the waveshape information corresponding to the key code; and

a tone source device for reading out the information from the memory circuit on a time divided basis to thereby simultaneously obtain waveshapes of different frequencies with the frequencies based on the time division;

wherein the tone source device divides the key code from the key assignor into a plurality of time divided channels and includes waveshape generators of different sound ranges in each of the channels, and wherein there is provided means for reading out the waveshape information from the memory circuit corresponding to the divided information, respectively.

2. An electronic musical instrument according to claim 1, wherein there are provided a plurality of tone source devices, each including waveshape generators of different sound ranges respectively corresponding to the keys whose key codes are in the same channel, and wherein there is provided means of simultaneously actuating by means of a key code from the key assignor those of the waveshape generators corresponding to that key code.