JPS61121088A - Electronic musical instrument - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electronic musical instrument in which data is transferred between a keyboard circuit, a panel control circuit, a tone generation circuit, etc. by asynchronous serial transfer using a single data bus.

2. Description of the Related Art In recent years, microcomputers have come to be used in electronic musical instruments, making it possible to perform functions that require complex sequence control, such as automatic performance, automatic rhythm, and recording and reproducing performance information. Data transfer between electronic musical instruments has also begun, and the use of microcomputers has become essential here as well.

An example of the above-mentioned electronic musical instrument will be described below with reference to the drawings.

FIG. 6 shows the configuration of a conventional electronic musical instrument. 6th
In the figure, 61 is an upper keyboard circuit, 62 is a lower keyboard circuit, 6
3 is a foot keyboard circuit, 64 is a control panel circuit, 66
66 is a control circuit, 66 is a first tone generator, 56 is a second tone generator, 67 is an effect circuit, 68 is a mixing circuit, and 59 is an audio device.

The operation of the electronic musical instrument configured as described above will be explained below. The control circuit 66 has a built-in microcomputer, and under its sequence control, it first outputs a scanning signal for the keyboard switch to the upper keyboard circuit 61, and detects whether the keyboard switch is on or off. Next, the same process is performed for the lower keyboard circuit 62 and foot keyboard circuit 53.

In this way, the control circuit 65 performs key 7 signature processing based on the on/off information of the keyboard switches of each keyboard circuit. This is because the tone generator described later has only a certain number (for example, 16) of sound generation channels. Next, a scanning signal such as a switch is output to the control panel circuit 64, and the state (on/off or voltage value) of the switch is detected. Then, panel information such as timbre, rhythm type, volume, tempo, etc. is calculated from these conditions. Next, key-in information and panel information from the panel information to the first tone generator are sent to the first tone generator 56 and the second tone generator 66.
send to Next, the panel information is the control panel circuit 64.
It is sent as blinking information of the light switch to the effect circuit 57.
is sent as effect switching information to the mixing circuit 68, and volume information and the like are sent to the mixing circuit 68.

The musical tone signal of the first tone generator 66 is sent to the mixing circuit 58, and the musical tone signal of the second tone generator 66 is sent to the mixing circuit 68 and the effect circuit 67. The musical tone signal synthesized by the mixing circuit is sent to an audio device 69 and generated.

Problems to be Solved by the Invention However, in the above configuration, the microcomputer of the control circuit 66 scans each keyboard circuit.

You have to control the sound of the tone generator, change various switches, and also automatic performance and rhythm.

A large amount of data processing is becoming necessary to achieve functions such as recording and reproducing performance information. However, the delay in sound produced by key operations on electronic musical instruments can be difficult to perform.
Or, for auditory purposes, it must be within a few milliseconds,
As the amount of data processed by microcomputers increases,
Correspondingly, the processing time increases, and the time interval between scanning each keyboard circuit becomes longer, resulting in a problem in performance that the response of sound to key operations becomes slower.

Furthermore, since a large number of data buses and musical tone signal lines are individually interconnected between each circuit, there is a problem in that the amount of wiring is extremely large.

In view of the above problems, the present invention has changed the centralized control by one microcomputer to each keyboard circuit.

To provide an electronic musical instrument in which an increase in processing time is prevented by having a microcomputer in each tone generator, etc. for distributed control, and the amount of wiring is extremely reduced by transferring data using a single data bus. It is.

Means for Solving the Problems In order to solve the above problems, the electronic musical instrument of the present invention includes a keyboard circuit that performs key-in processing, a musical tone generation circuit that controls the tone generator, and a control panel that controls information. The circuit includes a control channel circuit that performs arithmetic processing, and a data bus that transfers data between the circuits using asynchronous serial signals.

Effect of the Invention With the above-described configuration, the present invention reduces processing time by distributing data processing such as key assignment processing 9 sound generation control and panel information processing to each circuit, and also reduces data transfer between each circuit. By using asynchronous serial signals, it is possible to significantly reduce wiring.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, 11 is an upper keyboard circuit, 12 is a lower keyboard circuit, and 13 is a lower keyboard circuit.
14 is a foot keyboard circuit, 14 is a control channel circuit, 16 is a musical tone generation circuit, 16 is an effect circuit, 17 is an audio device, 18 is an external interface circuit, and 19 is a data bus.

The electronic musical instrument configured as described above will be explained below with reference to FIGS. 2, 3, and 4.

First, FIG. 2 shows the upper keyboard circuit 11. The insides of the lower keyboard circuit 12 and the foot keyboard circuit 13 are shown. 21 is a keyboard switch, 22 is a scanning circuit, 23 is a data editing circuit, 24 is a node control circuit, and 26 is an assignment memory. The data editing circuit 23 has a processor function, and first sends a scanning signal to the scanning circuit 22. The scanning circuit 22 scans the keyboard switch 21 and selects the keyboard switch 210.
Returns the on/off signal to the data editing circuit. The data editing circuit performs key 7 signature processing based on this on/off information. For example, if the number of sound generation channels is eight, the keyboard switches are assigned to the sound generation channels with priority relationships such as light tone priority and back tone priority. These key 7 signature processes are similar to those conventionally used. The result of the key approval signature is stored in the assignment memory 26. When a change occurs in the contents of the assignment memory 26, a demand signal is issued to the node control circuit and the new assignment contents are written in the assignment memory 26. The node control circuit receives the demand signal and transfers the data in the assignment memory 25 to the musical tone generation circuit 16.

Data transfer between node control circuits will now be explained. The node control circuit is included in each circuit connected to the data line 19 in FIG. 1, and each circuit has an ID number determined in advance. These are shown in Table 1.

Data from the keyboard circuit is sent in the format shown in Figure 4 B. This is the opening flag (Or) #Destination II) (1) ID).

Lease ID (SID), key number (KN1~[8)
, the data structure of the closing flag (OF).

(Left below) No. 1 When data is transferred from the keyboard circuit 11 to the musical tone generation circuit 16, DID is "O6", 5II is °°o1".
becomes. The opening flag and closing flag are used to create synchronization timing during asynchronous data transfer, and to start and end data transfer.

Data from the control panel 14 is transferred in the configuration shown in FIG. OF, DID, SID, OF and switch number (8N),! This is two-level data (LD). The data structure from the musical tone generation circuit 1S is shown in FIG. 4CK. O
F, DID, SID, OF and waveform data (WDl, WD
2...-WDn). The data structure from the external interface circuit 1B is as shown in FIG. 4d if it is keyboard information.

From OF and D, SAD, OF, and KDl ~ KDn.

KDl is a key number, and KD2 and below are key press speed, aftertouch, etc. Further, if the data from the external interface circuit is switch information, the process is similar to that shown in FIG. However, it becomes 5IDFi"08".

Next, data bus access management is based on a token bus method. The node control circuits that have received the transmission right (token) transmit data in the order of the IDs. When there is no data to send, the transmission right is passed to the next node control circuit.

FIG. 3 shows the control panel circuit 14.

31 is a control panel switch, 32 is a scanning circuit,
33 is a data editing circuit, and 34 is a node control circuit.

This is the same operation as in the case of the keyboard circuit (see Figure 2); switch information from the control panel 31 is taken in via the scanning circuit 32 under the control of the data editing circuit 33, and when there is a change in the switch state, A demant signal is sent to the node control circuit 34 only when the switch number (SN) and level data (I, D) are sent. The node control circuit 34 is connected to the musical tone generation circuit 16 using the data transfer method described above.
Send data to.

FIG. 6 shows the musical tone generation circuit 16.

61 is a tone generator, 62 is a tone generator control circuit, 63 is a data editing circuit, and 64 is a node control circuit. When data from the keyboard circuit or control panel circuit 14 is sent to the node control circuit 64, I) ID
Receives data only if °t o s FFo,
Next, the SID is set to Pao1” ((02”, “
In the case of "03", the data is processed as keyboard information in the format shown in FIG. 4a. If the SID is "o4", the data is processed as control panel information in the format shown in Figure 4.

A digital musical tone signal having a musical waveform calculated by the musical tone generation circuit is sent to the effect circuit 16 and the audio device via the data bus 19. The operation of the effect circuit 16 is controlled by the control panel circuit 1.
It operates based on the changeover switch information from 4. Sound device 17
The digital musical tone signal from the musical tone generation circuit 16 or the effect circuit 10 is stored in an internal memory circuit, and then read out from the memory circuit so as to have a predetermined pitch.
Convert and record as an analog musical sound signal via an amplifier.

The external interface circuit 18 receives data from each keyboard circuit and the control panel circuit 14, converts it into a predetermined format, and outputs it. Regarding data from the outside, conversely, each keyboard circuit, control panel circuit 14. Effect circuit 1
Sent to 6, key? Performs sign processing and data calculations. The results are linked to pronunciation through the processing described above.

In this embodiment, the number of sound generation channels is eight, but the number is not limited to this number. Also, the upper keyboard circuit 11 serves as a keyboard circuit. The lower keyboard circuit is 129, and the foot keyboard circuit is 13.
This may be one or more.

Effects of the Invention As described above, the present invention includes a keyboard circuit that performs key-in processing, a musical tone generation circuit that controls the tone generator's sound generation, a control panel circuit that performs arithmetic processing of control panel information, and a By providing a data node that performs data transfer using asynchronous serial signals, sequence control is distributed and each circuit performs arithmetic processing in parallel, making it possible to shorten calculation time. By transmitting data between each circuit using an asynchronous serial signal, the amount of wiring can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an upper keyboard circuit 11 of the embodiment. A keyboard circuit configuration diagram common to the lower keyboard circuit 121 and foot keyboard circuit 13, FIG. 3 is a circuit configuration diagram of the panel control circuit of the same embodiment, FIG. 4 is a signal format diagram of data transfer of the same embodiment, and FIG. 6 6 is a circuit configuration diagram of the musical tone generation circuit of the same embodiment, and FIG. 6 is a configuration diagram of a conventional example. 11... Upper keyboard circuit, 12... Lower keyboard circuit, 13... Foot keyboard circuit, 14...
Control panel circuit, 15... Musical tone generation circuit, 16
...Effect circuit, 17...Sound device, 1
8...External interface circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (3)

[Claims] (1) One or more keyboard circuits that perform key assignment processing, a tone generation circuit that controls the tone generator's sound production, a control panel circuit that performs arithmetic processing of control panel information, and data transfer between each of the circuits. An electronic musical instrument characterized by being equipped with a data bus that performs the following using an asynchronous serial signal. (2) An audio device that converts a digital musical tone signal from a tone generator to produce a musical tone, and a data bus that transfers data between the tone generator and the acoustic device in the form of a digital musical tone signal. An electronic musical instrument according to claim 1. (3) The electronic musical instrument according to claim 1, further comprising an external interface circuit for inputting and outputting performance information such as keyboard information and control panel information to and from an external device.