JPH0756843A - Control information transfer system - Google Patents

Abstract

PURPOSE:To easily set the value of control information to be transferred by securing a wide variable range for the value of the control information to be transferred. CONSTITUTION:This system is provided with a transfer data output device equipped with an identification data input device 12a and a value data input device 12b and a transfer data input device equipped with an identification data output device 28 and a value data output device 26, the transfer data output device is provided with a data converting device 14 for converting value data to floating point data and outputting them as transfer data when prescribed identification data are inputted, the transfer data input device is provided with a data converting device 24 for converting the received value data to any desired data format and outputting them from the value data output device 26 when the prescribed identification data are received, and the value data converted to the floating point data and the value data not converted to the floating point data are transferred while being mixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control information transfer system, and more particularly to a control information transfer system suitable for transferring control information of musical sounds in an electronic musical instrument.

[0002]

BACKGROUND OF THE INVENTION Generally, in the field of electronic musical instruments, an effect device for generating control information such as a parameter for changing the characteristics of a musical tone to be generated and a musical tone generating device are connected by a communication means based on the MIDI standard. By transferring control information such as parameters from the device to the tone generator,
The characteristics of musical tones generated by the musical tone generating means are controlled.

Here, in the above-mentioned MIDI standard used for electronic musical instruments, it is usually "0 to 127".
Is specified to be transmitted, or a value that is an integral multiple thereof.

By the way, recently, various parameters are transferred as a MIDI signal by using an exclusive message defined in the MIDI standard.

As a parameter transferred by the MIDI signal using such an exclusive message, for example, there is a filter parameter.

The parameters of the filter include a frequency parameter, a resonance sharpness Q, a level, etc. Generally, a frequency parameter 20 Hz to 20 KHz and a resonance sharpness Q 0.1 to 10 level -12 dB to +12 dB, respectively. It is configured to take a variable range of values.

Conventionally, the above-mentioned parameters are set to MID
When transferring between devices designed based on the I standard, a parameter is assigned to an integer multiple of 128 steps of "0 to 127" for normalization, and the transfer is performed based on the normalized value. Was taking.

However, in such a method of temporarily normalizing and transferring parameters, since a conversion means for normalization corresponding to each parameter must be provided, the structure becomes complicated and However, there was a problem that the manufacturing cost had to be increased.

Further, since the range in which the parameter is used varies depending on the device, the conversion means for normalization must be different for each device. However, if the conversion means for normalization is different, the setting state becomes complicated and the operability is poor.

That is, if "1 KHz" is set as a frequency parameter for two devices whose frequency parameters are used in different ranges, the set values will be different between these two devices, and the setting operation will be different. It was a factor that became complicated.

The present invention has been made in view of the above-mentioned various problems of the prior art, and an object thereof is to make it possible to set a wide variable range of the value of control information to be transferred. In this way, when transferring the parameters of the filter as described above, it is possible to transfer the above values as they are without normalizing them, and it is easy to set the value of the control information to be transferred. It is intended to provide a system.

[0012]

In order to achieve the above object, the control information transfer system according to the present invention provides control information composed of identification data representing the type of information and value data representing the value of the information. In the control information transfer system for transferring in a predetermined format, the control information transfer system has identification data input means for inputting identification data of control information to be transferred and value data input means for inputting value data of control information to be transferred. Then, the transfer data output means for outputting the control information composed of the input identification data and the value data as the transfer data and the transfer data output from the transfer data output means are received, and the identification data of the transfer data is received. Transfer data input means having identification data output means for outputting and value data output means for outputting value data of transfer data The transfer data output means has a first data conversion means for converting the value data into floating point type data when the predetermined identification data is input and outputting the data as transfer data. The transfer data input means has second data conversion means for converting the received value data into a desired data format when the data of the predetermined identification data is received and outputting the value data from the value data output means. The value data converted into floating point type data and the value data not converted into floating point type data can be mixedly transferred.

[0013]

In the transfer data output means, when the predetermined identification data is inputted, the value data of the control information indicated by the identification data is converted into the floating point type data by the first data conversion means. Will be output. Further, in the transfer data input means, when the predetermined identification data is received, the value data (floating point type data) of the control information indicated by the identification data is desired by the second data conversion means. The data will be converted into a data format and then output.

For this reason, with respect to the control information having a large variable range of the value data, if predetermined identification data is given so as to convert the data into floating point type data, the control is performed by the first data conversion means. Since the value data of information will be converted into floating point type data,
It is possible to transfer between the transfer data output means and the transfer data input means with the value as it is without normalization.

Moreover, since the value data converted into floating point type data (converted value data) and the value data not converted into floating point type data (non-change value data) can be mixedly transferred, the transfer can be performed. The degree of freedom is high.

Floating-point type data has a characteristic that the smaller the value, the finer the resolution. However, the smaller the value of a commonly used parameter, the easier it is to use the smaller the value. Even when transferring control information, it is very easy to use and effective.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a control information transfer system according to the present invention will be described in detail below with reference to the drawings. In the following description, a case where the control information transfer system according to the present invention is transferred in the format according to the MIDI standard will be described.

The control information transfer system according to the present invention comprises a transfer data output device which constitutes an output side device of transfer data transferred by the control information transfer system, and an input side which receives the transfer data output from the transfer data output device. And a transfer data input device constituting the device.

FIG. 1 is a block diagram showing a transfer data output device which constitutes an output side device of the control information transfer system.

This transfer data output device comprises a control device 10
The overall operation is controlled by the control information input device 12 and the control information to be transferred to the transfer data input device is input to the control device 10.

The control information is composed of identification data indicating the type of the control information and value data indicating the value of the control information. The identification data is the identification data input device 12a.
Is input to the control device 10, and the value data is input to the control device 10 by the value data input device 12b.

Further, the transfer data output device converts the identification data into the MIDI format, and the value data input by the value data input device 12b is
The value "0-12" that is usually used in the MIDI standard
In the case of "7", the value data is converted into normal MIDI format data as it is, and the value data input by the value data input device 12b exceeds the range of "0 to 127" which is a value normally used in the MIDI standard. In this case, the data conversion means 14 for converting the value data into floating point type data in the MIDI format and the MID by the data conversion means 14 by the processing described later.
And a transfer signal generating means 16 for generating a MIDI signal based on the identification data and the value data converted into data conforming to the I format.

Therefore, in this transfer data output device, the value data converted into floating point type data (converted value data) and the value data not converted into floating point type data (non-change value data) are mixed. It will be possible to transfer.

Then, the MIDI signal generated by the transfer signal generating means is input to the transfer data input terminal of the transfer data input device via the transfer data output terminal.

Next, the value data exceeding the value "0-127" which is normally used in the MIDI standard is converted into MIDI data.
The process of converting to floating point data in the format will be described.

The MIDI format is defined as 8-bit serial data, and when the 8th bit of the data is "1", it is treated as a status byte indicating the type of data. Therefore, the identification data input by the identification data input device 12a is
In the format, the 8th bit of the data is converted into a status byte which is "1".

On the other hand, when the 8th bit of the data is "0", it is treated as a data byte representing the value of the data. Therefore, the value data input by the value data input device 12b is data in which the 8th bit of the data is “0” in the MIDI format.
Will be converted to bytes. Therefore, the effective data width of the data byte is limited to 7 bits.

Therefore, there is a problem in handling a value exceeding the range of "00H to 7FH (" H "indicates a hexadecimal number):" 0 to 127 "in decimal number""on the MIDI format. In the invention, it is handled as floating point type data as follows.

The value data (converted value data) converted into floating point type data in the MIDI format is M
It will be handled in the exclusive message in the IDI standard.

In the present embodiment, a value exceeding the range of "0 to 127" is set as a set of 2 bytes of data bytes in the MIDI format, and this set of 2 bytes represents one floating point type data. I did it.

That is, since one floating point is represented by a set of 2 bytes of data, as shown in FIG. 3, both the 1st byte and the 2nd byte are the 8th bit (bit7) in the MIDI format. ) Is always "0".
Then, the 7th bit (bit 6) of the first byte is the sign bit S, "S = 0" represents "+", and "S =
"-" Is represented by "1".

Furthermore, the first byte "bit0-bit"
5 ”represents the exponent part of floating point data, and 2
The mantissa part of the floating point type data is represented by "bit0 to bit6" of the byte.

That is, in the binary representation, the bit string of X5 X4 X3 X2 X1 X0 represents the exponent part of "2", and the bit string of Y6 Y5 Y4 Y3 Y2 Y1 Y0 represents the mantissa part of "2". And these 2 bytes give a number = (− 1) ^S × 1. Y6 Y5 Y4 Y3 Y2
Y1 Y0 × 2 ^{X5 X4 X3 X2 X1 X0-11111} can be represented.

When X5 X4 X3 X2 X1 X0 in the above-mentioned binary number expression is E in decimal number expression and Y6 Y5 Y4 Y3 Y2 Y1 Y0 is F in decimal number expression, the above value is a numerical value = (-1 ) ^S × 1. It is expressed as F × 2 ^E-31 .

When the above numerical values are calculated, the maximum value of the above numerical values is the maximum value = 1.1111111 × 2 ^111111-11111 = 855.
6380160, and the minimum value is: minimum value = -1.1111111x2 ^111111-11111 = -8
It becomes 556380160.

Therefore, values of "-8556380160 to 8556380160" exceeding the range of "0 to 127" can be expressed in the MIDI format without normalization.

In the binary representation, (1) S = 0, X5 = X4 = X3 = X2 = X1 = X0 =
0, Y6 = Y5 = Y4 = Y3 = Y2 = Y1 = Y0 = 0, and (2) S = 1, X5 = X4 = X3 = X2 = X1 = X0 =
In the case of 0, Y6 = Y5 = Y4 = Y3 = Y2 = Y1 = Y0 = 0, it is sufficient to represent the same numerical value “0.0”.

Therefore, by performing the processing as described above, it is possible to express values exceeding the range of "0 to 127" in the MIDI format without normalization.

Next, the conversion value data of the MIDI format converted into the floating point type data by the above-mentioned processing and the M not converted into the floating point type data.
A transfer data input device for receiving non-converted value data in the IDI format and identification data will be described.

FIG. 2 is a block diagram showing a transfer data input device constituting the input side device of the control information transfer system.

This transfer data input device is a control device 20.
Thus, the entire operation is controlled, and the MIDI signal output from the transfer data output device is input to the control device 20 from the transfer signal demodulation device 22.

Further, the transfer data input device is provided with a data converting means 24, and by this data converting means 24, the converted value data can be converted into a desired data format and outputted from the value data output device 26. ing.
Further, the identification data is output from the identification data output device 28.

By constructing the control information transfer system by the transfer data output device and the transfer data input device described above, the MIDI format is used without normalizing any value exceeding the range of "0 to 127". While it can be transferred.

It should be noted that the floating point is not limited to being represented by a set of 2 bytes as shown in this embodiment, and depending on the value, it may be represented by 3 bytes or more bytes. A set may be configured, or 1 byte may be divided and used.

[0045]

Since the present invention is constructed as described above, it has the following effects.

In a control information transfer system that transfers control information composed of identification data indicating the type of information and value data indicating the value of the information in a predetermined format, the control information transfer system identifies the control information to be transferred. Control information including identification data input means for inputting data and value data input means for inputting value data of control information to be transferred, and control information composed of the input identification data and value data,
Transfer data output means for outputting as transfer data, identification data output means for receiving transfer data output from the transfer data output means and outputting identification data of the transfer data, and value data output means for outputting value data of the transfer data Transfer data input means having a transfer data input means, and the transfer data output means converts the value data into floating point type data and outputs the transfer data as transfer data when predetermined identification data is input. Having one data conversion means,
The transfer data input unit has a second data conversion unit that, when receiving the data of the predetermined identification data, converts the received value data into a desired data format, and outputs the value data output unit. Since the value data converted into the floating point data and the value data not converted into the floating point data can be mixedly transferred, the transfer data output means receives the predetermined identification data. In this case, the value data of the control information indicated by the identification data is converted into the floating point type data by the first data conversion means and is output.

In the transfer data input means,
When the predetermined identification data is received, the value data (floating point type data) of the control information indicated by the identification data is converted into the desired data format and output by the second data conversion means. become.

For this reason, with respect to the control information having a large variable range of the value of the value data, if predetermined identification data is given so as to convert the data into floating point type data, the control is performed by the first data conversion means. Since the value data of information will be converted into floating point type data,
It is possible to transfer between the transfer data output means and the transfer data input means with the value as it is without normalization.

That is, since the variable range of the value of the control information to be transferred can be widened, the value of the control information to be transferred can be easily set.

Moreover, since the value data converted into floating point data (converted value data) and the value data not converted into floating point data (non-changing value data) can be mixedly transferred, the transfer can be performed. A high degree of freedom can be maintained.

Further, the floating point type data is characterized in that the smaller the value is, the finer the resolution is. However, the generally used parameters are the smaller the resolution, the easier it is to use. Even when transferring control information, it is possible to realize a control information transfer system that is very easy to use and effective.

[Brief description of drawings]

FIG. 1 is a block diagram showing a transfer data output device that constitutes a control information transfer system according to the present invention.

FIG. 2 is a block diagram showing a transfer data input device that constitutes the control information transfer system according to the present invention.

FIG. 3 is an explanatory diagram showing a conversion process into floating-point type data in the MIDI format.

[Explanation of symbols]

 10 control device 12 control information input device 12a identification data input device 12b value data input device 14 data conversion device 16 transfer signal generator 20 control device 22 transfer signal demodulation device 24 data conversion device 26 value data output device 28 identification data output device

Claims (1)

[Claims] 1. A control information transfer system for transferring, in a predetermined format, control information composed of identification data representing a type of information and value data representing a value of the information, wherein the control information transfer system is a control for transferring. Control data including identification data input means for inputting identification data of information and value data input means for inputting value data of control information to be transferred, and control information composed of the input identification data and value data is used as transfer data. Transfer data output means for outputting, identification data output means for receiving the transfer data output from the transfer data output means, outputting identification data of the transfer data, and value data output means for outputting the value data of the transfer data. And a transfer data input means having, wherein the transfer data output means is provided when predetermined identification data is input. It has a first data conversion means for converting the value data into floating point type data and outputting it as transfer data, wherein the transfer data input means receives the value data received when the data of the predetermined identification data is received. Having a second data conversion means for converting the data into a desired data format and outputting from the value data output means, value data converted into floating point type data and value data not converted into floating point type data And a control information transfer system characterized by being able to transfer together.