JPH0762798B2 - Keyboard information processing device for electronic musical instruments - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard information processing apparatus for an electronic musical instrument, which detects the on / off state of a keyboard switch of the electronic musical instrument and assigns or deletes a channel for a key switch signal.

[0002]

2. Description of the Related Art Conventionally, a keyboard circuit of an electronic musical instrument has been improved by digital technology in recent years, and time-division scanning of a key switch is performed to extract the on / off state of the key switch as a time-division key signal of "1" and "0". A method of allocating a channel to a key switch in an ON state by a signal has been proposed. Further, a method has been proposed in which the key switch is divided into several blocks, and each block is time-divisionally scanned to detect the on-state key switch and assign a channel.

However, all of these conventional methods require a key switch scanning circuit, and the latter method of dividing the key switch into blocks is improved in order to shorten the scanning time. , The control logic circuit is complicated and the adjustment is quite troublesome. In addition, it is extremely complicated to perform key information detection such as automatic performance. If you want to expand the number of keys or channels, or change various functions, the configuration of the keyboard information processing device has to be large, complicated, and expensive due to the expansion or change. .

[0004]

SUMMARY OF THE INVENTION The present invention is intended to improve the above-mentioned drawbacks, and an object of the present invention is to provide an electronic musical instrument having a simple structure without using a key switch scanning circuit and having a high degree of freedom of expansion and modification. It is to provide a keyboard information processing device.

[0005]

In order to achieve the above object, a keyboard information processing apparatus for an electronic musical instrument of the present invention comprises (A) a plurality of key blocks, each key block being
It consists of multiple key switches , and each key block
Key switch means to which an address is assigned, (B) address designating means, and (C) temporary storage for temporarily storing key information for each key block.
Storage means and (D) a channel register for storing channel allocation information.
A register means, (E) a storage means in which a processing program is stored, and (F) a CPU , wherein the CPU is a processing means stored in the storage means.
According to a logical program, (a) outputting a read command to the addressing means.
And are addressed by the addressing means.
The specified key block of the key switch means
Key information indicating the on or off state of each key switch
Read, (b) the read key information and the read key
Corresponding to the information and already stored in the temporary storage means.
Compared with old key information that, if a match is (c) the comparison result, said addressing means
By outputting a read command to the key switch hand
Move to the process to read the key information from the next key block in the row.
Ri, if match; (d) the comparison result, on or off like
Corresponding to the key switch whose state has changed
Assign or delete to the channel register means,
The read key information is stored in the temporary storage means as an old key.
After storing as information, read out to the addressing means
By outputting a command, the next
Move to the process of reading the key information from the key block.
Characterize.

[0006]

EXAMPLES The present invention will be described in detail below with reference to examples.

FIG. 1 is a schematic explanatory view showing the structure of an embodiment of the present invention.

In FIG. 1, a key switch circuit 1 includes a plurality of key blocks each composed of a plurality of key switches, and key ON / OFF information for each key block is collectively addressed by an addressing circuit 2. The key block information is transmitted to the common bus 7 via the gate circuit 3 in synchronization with the.

The key block information is stored in the random access memory (RAM) area of the storage circuit 5 from the common bus 7, the program stored in the fixed memory (ROM) area is read out, and the information processing unit (via the common bus). CPU) 4 is operated. That is, the new block information from the key switch circuit 1 is taken into the CPU 4 via the common bus 7, and compared with the old key block information written in the RAM area of the memory circuit 5, the key whose key state has changed Channels are assigned to or deleted from the signals as needed. Then, new key data is written in the channel register 6 corresponding to each channel. In the above case, addresses are assigned to the memory circuit 5 and the channel register 6 in addition to the gate circuit 3 and are designated by the address designating circuit 2.

FIG. 2 is a detailed explanatory diagram of the key switch circuit 1 and the gate circuit 3 of FIG.

The number of key switches of an electronic musical instrument is small, dozens, and large, hundreds.
Divide into blocks. At this time, n is determined by the number of bits of the CPU 4. In the present embodiment, one octave is made to correspond to one block with n = 12, and the block code and the octave code are partially matched to facilitate the conversion of the block code to the octave code, which will be described later. There is no need to set = 12. In this embodiment, a 12-bit microcomputer such as TLCS-12A manufactured by Toshiba Corp. is used as the CPU 4.

As shown in FIG. 2, the key switch 11 is 1
It is divided into two blocks, and an address is assigned to each block. In the figure, for example, address 4080,
Addresses 4081 and 4082 are assigned. The address designated by the read command of the key switch information from the address designating circuit 2 via the line l ₁ , for example, 4080
A "1" level signal is given to the address, and the signal is given to the common bar 11-1 of the key switch 11. This time through the diode 12 through a line l ₂ from the key switch 11 in the ON state of the block is connected to a common line l _3,
The common line l ₃ is connected to the bus bar l ₄ via the 3-state gate circuit 14. The tri-state gate circuit 14 is opened by an addressing signal via the OR circuit 13 when any of the blocks is designated for reading.

That is, <4080>, <4081>,
Each bit of each address of <4082> corresponds to the key switch 11 and is read by the CPU 4 by a read command. In this embodiment, 3 octaves 36
Although the key is shown in the figure, it goes without saying that it can be applied to a larger number of blocks and keys.

FIG. 3 is a block diagram of the information processing unit (CP) of the embodiment of the present invention.
4 is a flow chart showing the operation of U) 4. This will be described below with reference to FIG.

In FIG. 1, the key information of each block is sequentially read out by designating an address corresponding to each block and given to the CPU 4 via the bus bar l ₄ . The CPU 4 compares the key information (hereinafter referred to as old key information) corresponding to the same block in the memory circuit 5 with the key information from the gate circuit 3 (hereinafter referred to as new key information), and if they match each other. The next block address (+1) is read. The above procedure is shown by the loop of the program of FIG. If they do not match, move to the following program. That is, the exclusive OR (EX-OR) is calculated for each bit of the new key information and the old key information, and the bit in which the key information has changed is detected (). Then, the octave code and the note code to which the changed key belongs is calculated from the changed bit and the address code of the block and temporarily stored (). Next, by checking the change bit above in the new key information,
An on-off bit that identifies a key switch change is detected ().

Then, the new key information is transferred to the address in the RAM area where the old key information was stored (). This on / off bit key code (octave code, note code) is written to an empty address in the case of key-on by the channel assignment program, and the code of the channel having the corresponding key code is erased in the case of key-off ().

This channel allocation program is equivalent to that of Japanese Patent Application No. 52-13684 "Electronic Musical Instrument Channel Allocation Circuit". When the channel assignment program is finished, the next program is read again.

As described above , according to this embodiment,
For example, a device that compares new key information from the key switch circuit with old key information corresponding to the same block stored in the memory device and assigns or erases a channel to a key signal whose key state has changed. For example, the function is performed by an information processing unit that operates according to control information in a memory circuit. Especially, by using a microcomputer as the information processing unit, the configuration is simplified and downsized, and the price is low. The keyboard processing device of is obtained. Further, even if the number of keys or the number of channels is expanded, it is very easy to modify and deal with the information processing unit, and since the address is assigned to the key switch, it is possible to selectively read only a specific switch. It is also possible to change the program. In the automatic performance, it is possible to preferentially read out only the part of the accompaniment chord that determines the arpeggio, and the same applies to other effects.

[0019]

As described above, according to the present invention,
Read out from a given key block of the key switch means
Key information and temporary storage means corresponding to this key block
There was a change by comparing with the old key information stored in
Assign or delete channels for key switches
By the CPU operating according to the processing program of the storage means
Only the old key information is recorded in the temporary storage means.
Just remember it for the changed key switch
The pronunciation assignment can be deleted, the configuration is simplified and the size is reduced.
It In addition, the key information is read for each key block and the key is
Investigate whether the switch has changed, and if there is a change, sound immediately
Since it is assigned or deleted, the key is
Key information is read from the block and the key switch
Check if there is any change, and if there is a change, assign or delete the pronunciation
There is no CPU play compared to the configuration. Furthermore, C
PU is to output read command to addressing means
Selective key block in the key switch means
It is possible to read the
It becomes possible to read out by reading.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a detailed explanatory diagram of a main part of the embodiment of FIG.

FIG. 3 is a flowchart showing an operation of a main part of the embodiment shown in FIG.

[Explanation of symbols] 1 key switch circuit 2 address designating circuit 3 gate circuit 4 information processing unit 5 memory circuit 6 channel register

Claims (1)

[Claims] 1. (A) Each key block comprises a plurality of key blocks.
Block consists of multiple key switches, and
An address is assigned to each key block.
Switch means, (B) address designating means, and (C) temporary storage of key information for each key block.
Storage means and (D) a channel register for storing channel allocation information.
A register means, (E) a storage means for storing a processing program, and (F) a CPU , wherein the CPU is a processing program stored in the storage means.
According to the system, (a) a read command is output to the addressing means.
And are addressed by the addressing means.
The specified key block of the key switch means
Key information indicating the on or off state of each key switch
Read, (b) the read key information and the read key
Corresponding to the information and already stored in the temporary storage means.
Compared with old key information that, if a match is (c) the comparison result, said addressing means
By outputting a read command to the key switch hand
Move to the process to read the key information from the next key block in the row.
Ri, if match; (d) the comparison result, on or off like
Corresponding to the key switch whose state has changed
Assign or delete to the channel register means,
The read key information is stored in the temporary storage means as an old key.
After storing as information, read out to the addressing means
By outputting a command, the next
Move to the process of reading the key information from the key block.
A key information processing device for electronic musical instruments.