Electronic musical instrument having external memory devices

• US 4,922,794 A
• Filed: 02/03/1988
• Issued: 05/08/1990
• Est. Priority Date: 02/06/1987
• Status: Expired due to Fees

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Shibukawa, Takeo
• Primary Examiner(s): Grimley, A. T.
• Assistant Examiner(s): Smith, Matthew S.
• Application Number:
  US07/151,929
• Time in Patent Office: 825 Days
• Field of Search: 84/1.01, 84/DIG. 29, 84/DIG. 2, 84/1.28, 84/462, 84/1.03, 84/600-602, 84/609, 84/618, 84/622, 84/641, 84/642, 84/644, 364/200, 364/900, 364/ 200 MS File, 364/900 MS File
• US Class Current: 84/601
• CPC Class Codes: G10H 1/0041 in coded form
• CPC Class Codes: G10H 7/002 using a common processing for different operations or calculations, and a set of microinstructions (programme) to control the sequence thereof
• CPC Class Codes: Y10S 84/02 Preference networks

Abstract

An electronic musical instrument includes a musical tone information storing device, a plurality of external memory devices, a control unit, a switching unit, and a determining unit. The musical tone information storing device stores musical tone information. The control unit controls information transfer between at least one of the external memory devices and the musical tone information storing device. The switching unit generates a transfer command. The determining unit determines whether an external memory device of the highest priority in accordance with a predetermined priority is in a transfer enable state. The control unit controls information transfer between the external memory device of the highest priority which is selected by the determining unit and the musical tone information storing device.

Claims

1. An electronic musical instrument comprising:

a musical tone information storing device for storing musical tone information;

a plurality of external memory devices;

control means for controlling information transfer between at least one of said external memory devices and said musical tone information storing device;

switching means for generating a transfer command; and

determining means for determining an external memory device of a highest priority in accordance with a predetermined priority which is in a transfer enable state,

wherein said control means controls information transfer between the external memory device of the highest priority which is determined by said determining means and said musical tone information storing device.

2. A musical instrument according to claim 1, further comprising capacity checking means for checking whether a memory capacity of an external memory device to which information is to be transferred is larger than all information amount of said musical tone information storing device, wherein said control means controls transfer when the memory capacity of said external memory device to which information is to be transferred is larger than the information amount of said musical tone information storing device.

3. A musical instrument according to claim 1, wherein when said determining means determines on the basis of the transfer command generated from said switching means that said external memory device of the highest priority is not in the transfer enable state, said control means causes said determining means to determine whether an external memory device of the next priority is in a transfer enable state.

4. A musical instrument according to claim 3, wherein said control means controls information transfer between said external memory device of the next priority and said musical tone information storing device in accordance with information obtained from said determining means.

5. A musical instrument according to claim 1, further comprising full checking means for, when information is transferred to an external memory device, checking whether said external memory device is filled, wherein when said external memory device is filled during transfer, said control means causes said determining means to determine whether an external memory device of the next priority is in the transfer enable state, and when said external memory device of the next priority is in the transfer enable state, transfers the information to said external memory device of the next priority.

6. A musical instrument according to claim 1, further comprising connection information means for representing which external memory devices is connected to a musical instrument main body, wherein said determining means determines on the basis of connection information from said connection information means whether said external memory device of the highest priority is in the transfer enable state.

7. A musical instrument according to claim 1, wherein the musical tone information is input by a key operation.

8. A musical instrument according to claim 1, wherein the musical tone information is pitch and tone duration information.