JP2525932B2 - Pitch control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pitch control device that corrects pitch of data indicated by a signal such as a MIDI signal supplied to a sound source such as a MIDI device.

BACKGROUND ART MIDI standards have been established to enable the exchange of information by connecting and connecting musical instruments such as synthesizers and electronic pianos.

MI, which is a musical instrument performance control signal of a format defined to carry music information, is equipped with hardware according to the MIDI standard.
An electronic musical instrument having a function of transmitting and receiving DI signals is called a MIDI device.

The MIDI signal supplied to a MIDI device has a transfer rate of 31.25 [K
baud] serial data, which consists of 8 bits of data and 1 start bit and 1 stop bit in total.
Bits make up 1 byte of data.

Also, at least one status byte for specifying the type of data sent and the MIDI channel,
One or two data bytes guided by the status are combined to form a message that is music information. Therefore, one message is usually composed of 1 to 3 bytes, and its transfer requires a transfer time of 320 to 960 [μsec]. A musical instrument playing program is formed by a series of messages. Some messages have only status, and some messages have 3 bytes or more.

As an example of such a message, channel voice
The structure of the note-on message, which is one of the messages, is shown in FIG. The note-on message is, for example, a command corresponding to the operation of pressing the keyboard of the keyboard, and is used as a pair with the note-off message corresponding to the operation of releasing the keyboard of the keyboard. The status byte is a MIDI channel that indicates the type of MIDI device that should sound. The note number of data byte 1 designates one of the 128 scales assigned to the keyboard centered on the "center C" of the 88-key piano. The velocity of the data byte 2 is generally used to make a difference in sound intensity. Upon receiving the note-on message, the MIDI device generates a sound of a specified scale with a specified intensity. Further, by receiving the note-off message corresponding to the note-on message, the MIDI device operates so as to stop the sound generation by the note-on message. For example, if the note-on message has a note-on / channel of 90, a note number of 64, and a velocity of 40, the corresponding note-off message has a note-off / channel of 80 in the status byte and a note number of 40. 6
4, velocity is 40. You can also stop the note-on message with a note-on / channel of 90, a note number of 64, and a velocity of 00. Note that these MIDI messages are hexadecimal numbers, and the following descriptions are also hexadecimal numbers. Note-on / Channel 9n and Note-off / Channel 8n
Both take one of 16 channels from 0 to F.

By the way, the value of the note number in the note-on message is changed relative to the MIDI signal indicating the musical instrument playing program by the key correction value (for example, 1), and the MIDI signal transposed the musical piece is transmitted to the MIDI device. There is a pitch controller that provides the feed. For example, when the note-on / channel, note number and velocity are 90,64,40 as in the note-on message above, 90,65,40
, And if the note-off message is a note-off / channel, note number and velocity are 80,64,40, then change to 80,65,40 and supply to the MIDI device. Of. If such a device is provided, there is an advantage that a musical piece in so-called karaoke can be set in a musical range that matches a key (pitch) of a singer.

However, if a pitch correction command for changing the key correction value is issued after the note-on message of 1 is sent during the performance and before the note-off message for that is sent, the note-on message of 1 is issued. The problem that the pronunciation by the message is not stopped occurs. That is, normally, as shown in FIG. 7 (a), the note-on message is sent to produce sound in the MIDI device, and then the corresponding note-off message is sent to stop the sound. This is because the note-on messages actually supplied to the MIDI device are 90, 65, 40 and the note-off messages are 80, 65, 40, which correspond to the above-mentioned values. However, after the sound by sending a note-on message at time t ₁ as shown in FIG. 7 (b) is performed in the MIDI instrument, key correction value is the content of the pitch correction command at time t ₂ is changed also note-off message to the time t ₃ after the time point t ₂ when you have been sent
Note-on messages and note-off messages actually supplied to MIDI devices do not correspond. This is because when the key correction value changes from 1 to ₂ at time t ₂ , the note-on message actually supplied to the MIDI device is 90,65,40, while the note-off message is
This is because the message becomes 80,66,40 and does not correspond. Therefore, as shown in FIG. 7 (c), a problem occurs in that the pronunciation is not stopped.

SUMMARY OF THE INVENTION [Object of the Invention] It is an object of the present invention to provide a pitch control device capable of preventing a problem that a sound is not stopped due to a change in the content of a pitch correction command.

[Constitution of the Invention] The pitch control device of the present invention corrects the pitch of a note-on signal which is supplied from a signal generation source and which indicates a scale at which sound generation should be started or a note-off signal which indicates a scale at which sound generation should be stopped and is relayed to a sound source. A pitch control device for supplying, when the signal supplied from the signal source is a note-on signal, a value corresponding to the correction content is stored in the memory in correspondence with the note-on signal, and the note of the corrected pitch A means for outputting an ON signal and, when the signal supplied from the signal generation source is a note-off signal, a value corresponding to the correction content of the note-on signal corresponding to the note-off signal is read from the memory and the read value is read. And a means for correcting and outputting the note-off signal.

Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In the pitch control apparatus according to the present invention shown in FIG. 1, a data divider 1 is connected to an input terminal IN for MIDI signals. The data divider 1 separates a MIDI signal into a note-on signal, a note-off signal and other signals. That is, the data indicated by the MIDI signal is judged from the contents of the status byte and separated into two data, a note-on message, a note-off message, and other messages, and output. A note data processor 2 is connected to the note on / off output of the data divider 1. A memory 3 and a correction data generator 4 are connected to the note data processor 2. The memory 3 is a writable and readable memory. The correction data generator 4 generates data indicating a key correction value according to the operation of the keyboard 5.

The note data processor 2 is composed of, for example, a microcomputer, adds the key correction value output at that time from the correction data generator 4 to the note number of the supplied note on message, and adds the addition result to a new note. A note-on message as a number is created and output to the output terminal OUT, and the channel, note number, and key correction value of the supplied note-on message are set as one set and writable and readable memory 3 Write in. Also, the same channel and note number as the channel note number of the supplied note-off message is compared and searched from the memory 3, and the key correction value that forms a pair with the stored channel and note number is read to obtain the note number value. To create a note-off message with the addition result as a new note number, and output it to the output terminal OUT. Further, after reading the key correction value, the same read channel, note number and key correction value are erased from the memory 3. The operation of the note data processor 2 will be described later in detail.

Messages other than the note-on message and the note-off message are directly supplied from the data divider 1 to the output terminal OUT.

In such a configuration, the memory 3 is provided with an area for storing channels designated by addresses 0, 1, ... M, note numbers and key correction values as shown in FIG. For example, the channel stored at address 1 is CH
(1), note number is NO (1), key correction value is KEY
It is (1).

When a MIDI signal is supplied to the data divider 1 via the input terminal IN, the data divider 1 separates the data into a note-on message, a note-off message and other messages and outputs them. .
The data of the note-on message and the note-off message are held in order in a buffer (not shown) in the note data processor 2. The data held in the input buffer is shifted when read in byte units.

When the note-on message or the note-off message is supplied as data, the note data processor 2 first reads the data (step S1) as shown in FIG. Is a status byte (step S2). Since the most significant bit in the status byte is logical "1" and the most significant bit in the data byte is logical "0", it is determined from this. If it is a status byte, it is determined from the status byte whether or not it is the note-on status (step S3). That is, it is determined whether the status byte is 9n. If the status byte is 9n, it is the note-on status, so 1 is set in the flag F (step S4). If the status byte is 8n, it is the note-off status and the flag F is reset to 0 (step S5). After execution of step S4 or S5, the channel of the read status byte is held as CH in an internal register (not shown) of the note data processor 2 (step S6).

When the read data is not the status byte in the message in step S2, it is determined whether or not it is data byte 1 (step S7). This is a note
For on messages and note off messages,
Since two data bytes always follow the status byte, for example, a counter that is reset by the determination of the status byte and counts by the data byte 1 and counts by 2 by the data byte 2 is formed and judged from the count value. be able to. If the data byte 1 is the note number, it is further held in the internal register of the note data processor 2 as NO. (Step S8).

In step S7, when it is determined that the data byte is not 1, the read data is the data byte 2,
In this case, it is judged whether or not the flag F is equal to 0 as shown in FIG. 3 (b) (step S9). If F = 1, since the message has a note-on status, it is determined whether the data byte 2 is 00 (step S10). If data byte 2 ≠ 00, note
Since this is an on message, the variable A is set to A = 0 (step S11), and it is determined whether or not the address A of the memory 3 is an empty address in which no data is written (step S1).
2). A is a variable whose initial value is 0 and takes a value from 0 to m. If the address A is not an empty address, 1 is added to A (step S13), and the process proceeds to step S12 to determine the next address. When 1 is added when A = m in step S13, A = 0. On the other hand, if the address A is a vacant address, the channel of the status byte held is set as CH (A) and the note number is written as NO (A) in the memory 3 (step S14), and the key correction at that time is also performed. Read values and store as KEY (A) in memory 3
(Step S15). And note number N
The key correction value read in O is added to make it a new note number NO (step S16), the data of the read status byte is output (step S17), and the data byte 1 of the new note number NO is output ( Step S1
8) The read data byte 2 is output as it is (step S19).

Therefore, MIDI as a sound source connected to the output terminal OUT
Show note-on message on device (not shown)
If a MIDI signal is supplied and the MIDI device is the device indicated by the channel of the note-on message, the note of the scale given by the note number will be played at the level given by the velocity.

If F = 0 is determined in step S9, the read data is a note-off message.
Go to step S20. Further, in step S10, when the data byte 2 = 00, that is, when the velocity is 00, the note-off message is generated even in the note-on status, so the process proceeds to step S20.

In step S20, the variable B is set to B = 0, and it is determined whether or not the address B of the memory 3 is an empty address where no data is written (step S21). If the address B of the memory 3 is an empty address, 1 is added to B (step S2
2) It is determined whether the variable B is larger than m (step S23). If B ≦ m, the process returns to step S21. If address B of memory 3 is not an empty address, address B of memory 3
Channel CH (B) and note number NO (B) are read from (step S24), CH = CH (B) and NO = NO
It is determined whether or not it is (B) (step S25). CH ≠ C
If H and NO = NO (B), CH = CH (B) and NO ≠ NO (B) or CH ≠ CH and NO ≠ NO (B), the process proceeds to step S22 to read another data.

When CH = CH (B) and NO = NO (B), the key correction value KEY (B) is read from the memory 3 (step S26), and the key correction value KEY (B) is stored in the held note number NO. The addition result value is set as a new note number NO (step S27). Then, the note-off status byte 8n with the channel CH as n is output (step S2
8) The data byte 1 of the new note number NO is output to the output terminal OUT (step S29). Further, the input data byte 2 is output as it is to the output terminal OUT (step S30). Then, the channel CH (B), the note number NO (B) and the key correction value KEY (B) of the address B of the memory 3 are erased (step S31).

Thus, FIG. 4 (a) to be supplied to the input terminal IN at time t ₁ as shown the note-on message (note on / channel, note number, velocity)
Is (90,40,40) and the key correction value at this time t ₁ is 1, the note-on message supplied from the output terminal OUT to the MIDI device is (90,41,40).
Then, this note-on message causes the MIDI device to sound. At this time, the channel is CH (1) = 0, the note number is NO (1) = 40, and the key correction value is KEY in the vacant address A (for example, 1) of the memory 3.
It is written as (1) = 1. Time t ₂ after time t ₁
When the keyboard 5 is operated, the key correction value, which is the content of the pitch correction command, is changed from 1 to 2 as shown in FIG. 4 (b).
If the note-on message supplied to the input terminal IN is (90, 64, 40) as shown in FIG. 4 (c) at the subsequent time t ₃ , the output terminal OUT The note-on message supplied from to the MIDI device is (90, 64, 40), and the MIDI device produces sound by this note-on message. Note-off messages supplied to the input terminal IN at time t ₄ after the time t ₃ (note-off / channel, note number, velocity), then the (80,40,40), is supplied to the time t ₁ Since the channel and the note number of the note-on message match, the key correction value stored in the memory 3 is read as KEY (1) = 1 and added to the note number to become 41. As a result, the note-off message (80,41,40) is supplied from the output terminal OUT to the MIDI device, and the note-on message (90,40,40) is supplied to the input terminal IN at the time t _1. Pronunciation stops.

FIG. 5 shows a so-called karaoke system using the pitch control device according to the present invention.

In this karaoke system, the disc player 21
Plays a disc (not shown) to output the MIDI signal recorded on it. From disc player 21
MIDI signals are supplied to the pitch control device 22. Pitch control device
The MIDI signal passing through 22 is supplied to a MIDI sound source 23 as a MIDI device. If the supplied MIDI signal is a note-on message, the MIDI tone generator 23 generates an audio signal at the scale given by the note number of the message and at the level given by velocity, and the note number with different note numbers etc. If the ON message is further supplied, the audio signal having a plurality of scales is generated accordingly. Further, in the case of a note-off message, generation of an audio signal having a scale given by the note number of the message and a level given by velocity is prevented. On the other hand, the audio signal from the microphone 24 is amplified by the microphone amplifier 25 and supplied to the mixer 26. In the mixer 26, the audio signal from the MIDI sound source 23 and the audio signal from the microphone amplifier 25 are mixed. The output audio signal of the mixer 26 is amplified by the output amplifier 27 and supplied to the speaker 28, which drives the speaker 28.

Effect of the Invention As described above, in the pitch control device according to the present invention,
When the signal supplied from the signal generation source is the note-on signal, the value corresponding to the correction content is stored in the memory corresponding to the signal, and the note-on signal of the corrected pitch is output, while the signal generation source When the signal supplied from is a note-off signal, a value corresponding to the content of correction of the note-on signal with respect to the note-off signal is read from the memory and the note-off signal is corrected and output based on the read value. Be done. That is, when the content of the pitch correction has changed, when the note-off signal corresponding to the note-on signal being sounded at that time is supplied from the signal source, the value corresponding to the content of the correction is read from the memory and read out. Since the note-off signal is corrected and output according to the value, the sound generation up to immediately before the pitch change is surely stopped after the pitch change, and thus the pitch change is smoothly performed without causing the pitch break immediately after the pitch change.

[Brief description of drawings]

1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a storage state of a memory in the apparatus of FIG. 1, and FIG. 3 is an operation of a note data processor in the apparatus of FIG. FIG. 4 is a flowchart showing the operation timing of the apparatus of FIG. 1,
FIG. 5 is a block diagram showing a karaoke system using a pitch control device according to the present invention, FIG. 6 is a diagram showing a configuration example of a note-on message as MIDI data, and FIG. 7 is an operation timing in a conventional device. FIG. Explanation of main part code 1 …… Data divider 2 …… Note data processor 3 …… Memory 4 …… Correction data generator 5 …… Keyboard

Front Page Continuation (72) Inventor Shoichi Kojima 3-7-13 Shinkitajima, Suminoe-ku, Osaka City, Osaka Prefecture Roland Co., Ltd. (56) References JP-A-61-186999 (JP, A) JP-A-57- 64293 (JP, A) JP-A-4-40497 (JP, A) Actual development Sho 56-128692 (JP, U)

Claims (1)

(57) [Claims] 1. A pitch control device which corrects a pitch of a note-on signal indicating a scale at which sound generation is to be started and a note-off signal indicating a scale at which sound generation is to be stopped and relayed and supplied to a sound source. When the signal supplied from the signal source is a note-on signal, a value corresponding to the note-on signal is stored in the memory in correspondence with the content of the correction, and a note-on signal of the corrected pitch is output. When the signal supplied from the signal generation source is a note-off signal, a value corresponding to the content of correction of the note-on signal corresponding to the note-off signal is read from the memory, and the note-off signal is output according to the read value. A pitch control device comprising means for correcting and outputting.