JP2003050582A - Musical sound signal processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily imitate musical sound with individual texture of an old instrument. SOLUTION: A digital signal processing circuit 18 converts a bit rate, a sampling frequency and a frequency characteristic of inputted digital musical signal by a bit rate conversion part 51, a sampling frequency conversion part 52 and a multi-band equalizer part 53 according to a given parameter set and outputs them, respectively. This parameter set is preset so as to imitate the musical sound obtained from an old instrument (a vintage one), and is stored in a parameter storage pat 55. Instead of this, the musical sound can be imitated by using impulse response waveform data obtained from the old instrument (a vintage one) and processing the inputted digital musical sound signal by convolution operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a musical tone signal processing apparatus for inputting a digital musical tone signal consisting of a plurality of bits representing a musical tone waveform, and digitally processing the inputted digital musical tone signal for output.

[0002]

2. Description of the Related Art Conventionally, a digital musical tone signal having a plurality of bits representing a musical tone waveform is digitally formed and output, or a digital musical tone signal having a plurality of bits representing a musical tone waveform is subjected to digital signal processing. Outputting is well known. In this case, the bit rate (number of bits) of the digital musical tone signal and the sampling frequency (sampling rate) differ depending on the model. Generally, old models have low bit rate and sampling frequency, and in recent years, high-density integration of circuit devices,
Due to the higher calculation speed, the bit rate and the sampling frequency tend to increase in order to improve the sound quality.

[0003]

However, among old models (so-called vintage ones) having a low bit rate and a low sampling frequency, those which generate a musical tone having a unique texture which cannot be obtained by the models which have been widely spread in recent years. However, there are many music lovers who like the musical sound having this unique texture. Then, when such a music lover tries to generate a musical tone signal having a unique texture using the old model, there are the following problems. That is, since the old model is large and heavy, it is inconvenient to use, and its maintenance is not easy due to problems such as parts. In addition, in the case of old models, the memory capacity is generally small and it is not possible to process a musical tone signal of a long phrase.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its purpose is to use an old model (vintage model).
(EN) A tone signal processing apparatus capable of generating various tone signals having a unique texture similar to the tone signal formed or processed in (3) with a simple configuration and a simple operation.

In order to achieve the above-mentioned object, a feature of the present invention is that a digital musical tone signal having a plurality of bits representing a musical tone waveform is inputted and a digital signal processing circuit for processing the inputted digital musical tone signal as a digital signal is provided. In a musical tone signal processing device that outputs the digital musical tone signal as a digital signal processing circuit, a bit rate conversion unit that converts the bit rate of the digital musical tone signal, a sampling frequency conversion unit that converts the sampling frequency of the digital musical tone signal, and A plurality of parameter sets configured to include at least two conversion units of the frequency characteristic conversion units to be converted and composed of a combination of at least two types of parameters that respectively determine the signal processing characteristics of the at least two conversion units. Parameter description that remembers Means and in response to a selection operation by the user, one of the plurality of parameter sets stored in the parameter storage means is selected, and the selected one parameter set is at least A selection means for simultaneously supplying the two conversion units is provided, and a digital tone signal converted by the at least two conversion units according to the selected one parameter set is output. is there.

More preferably, the digital signal processing circuit is configured to have all of the bit rate conversion section, the sampling frequency conversion section and the frequency characteristic conversion section, and the parameter storage means performs signal processing of these conversion sections. A plurality of parameter sets each consisting of a combination of three types of parameters for determining the characteristics are stored, and one of the plurality of parameter sets stored in the parameter storage means in response to the user's selection operation. One set of parameters may be selected, and the selected one set of parameters may be simultaneously supplied to these conversion units.

In these cases, for example, musical tones similar to musical tones having a unique texture output from various models (vintage) such as existing old musical tone signal forming devices and musical tone signal processing devices can be obtained. As described above, it is preferable to store a plurality of parameter sets in the parameter storage means.

According to this, the user only selects one of the plurality of parameter sets stored in the parameter storage means, and the selected one parameter set is converted into a digital signal. It is supplied to the processing circuit. In the digital signal processing circuit, the input digital musical tone signal is subjected to conversion processing according to the selected one set of parameters and is output, so that a musical tone similar to the musical tone having the unique texture described above is obtained. be able to. As a result, with a simple configuration and simple operation, it is possible to obtain various musical tone signals having a unique texture similar to the musical tone signals formed or processed by old models, and music lovers who like this kind of musical tone. Will be able to be satisfied.

Further, another feature of the present invention is that, in the tone signal processing apparatus, in response to a change operation by a user, a part of one set of parameters selected by the selecting means is changed, and at least the at least one parameter set is selected. There is a correction means for supplying the two conversion units. Also in this case, one set of parameter sets for all of the bit rate conversion unit, the sampling frequency conversion unit, and the frequency characteristic conversion unit configuring the digital signal processing circuit is selected by the selection means, and the selected one set of parameter sets is selected. It is even better if a part of the parameter set can be changed.

According to this, the user changes a part of the selected set of parameters, and converts the digital tone signal converted according to the changed set of parameters into a digital signal processing circuit. Can be output from. As a result, it is possible to easily obtain a musical sound in which various musical sound signals having a unique texture similar to the musical sound signal formed or processed by the old model as described above are arranged, and further satisfy the music lover. Will be able to.

Another feature of the present invention is that the digital signal processing circuit is constituted by a convolution operation processing circuit for performing convolution operation processing on an input digital musical tone signal, and a plurality of impulse response waveforms respectively representing a plurality of impulse response waveforms. Impulse response waveform data storage means for storing response waveform data and any one of the plurality of impulse response waveform data stored in the impulse response waveform data storage means in response to a user's selection operation. Selecting means for selecting data and supplying the selected impulse response waveform data to the convolution operation processing circuit, and convolution operation in the convolution operation processing circuit according to the selected one impulse response waveform data It is designed to output a processed digital tone signal. Located in.

Also in this case, for example, it is possible to obtain a musical tone similar to a musical tone having a unique texture, which is output from various models (vintage) such as existing old musical tone signal forming devices and musical tone signal processing devices. It is preferable that a plurality of impulse response waveform data are formed and stored in the impulse response waveform data storage means.

The convolution calculation processing using such impulse response waveform data is suitable for reproducing the transfer characteristics of a signal, and also by this, a musical tone signal formed by various models and various models. A tone signal having characteristics similar to those of the signal-processed tone signal can be formed. As a result, according to the present invention as well, it is possible to obtain various musical tone signals having a unique texture similar to the musical tone signals formed or processed by the old model with a simple configuration and simple operation.
It will satisfy music lovers who like this kind of musical sound.

Also in this case, there is provided a correction means for changing a part of one impulse response waveform data selected by the selection means in response to a change operation by the user and supplying the changed data to the convolution operation processing circuit. Good.

Also by this, the user changes a part of the selected one impulse response waveform data, and digitally processes the digital tone signal which is arithmetically processed according to the changed one impulse response waveform data. It can be output from the circuit. As a result, also by this, it is possible to easily obtain a musical tone in which various musical tone signals having a unique texture similar to the musical tone signal formed or processed by the old model as described above are arranged to some extent. You will be able to make your home more satisfied.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows an electronic musical instrument provided with a tone signal processing apparatus according to the present invention.

This electronic musical instrument comprises a performance operator group 11, a setting operator group 12, a display 13 and a tone generator circuit 14. The performance operator group 11 is composed of a plurality of operators for designating the pitch of a musical tone generated for a user's performance operation, and is composed of, for example, a keyboard composed of a plurality of keys. There is. The setting operator group 12 selects the tone color of the generated musical tone, the effect given to the musical tone, and the like, and specifies the operation mode of this electronic musical instrument, in relation to the display state of the display unit 13. It consists of a plurality of controls operated by the user. These performance operators 1
1 and the setting operator group 12 are operated by the detection circuit 1 which is connected to the bus 20 and has a switch corresponding to each operator.
5, 16 are to be detected.

The display unit 13 is a liquid crystal display or a CRT.
It is composed of etc. and displays characters, figures, etc. The display state of the display 13 is controlled by the display control circuit 17 connected to the bus 20. The tone generator circuit 14 is connected to the bus 20 and forms a digital musical tone signal composed of a plurality of bits corresponding to performance data input via the bus 20. The formed digital musical tone signal is processed by a digital signal processing circuit (DSP). ) 18 is output.

The digital signal processing circuit 18 is composed of a register (RAM), an arithmetic circuit, a D / A converter, a program memory, etc. and is connected to the bus 20. The input digital musical tone signal is digitally processed by program processing. In addition to signal processing, the digital tone signal subjected to the signal processing is D / A converted and output to the sound system 19. A digital tone signal is also supplied to the digital signal processing circuit 18 via the bus 20. The digital signal processing circuit 18 is also directly related to the present invention and will be described in detail later. The sound system 19 includes an amplifier, a speaker, etc., and includes a digital signal processing circuit 18
The tone corresponding to the analog tone signal from is generated.

A bus 21, a CPU 21, a timer 22, a ROM 23, and a RAM 24, which constitute the computer main body, are provided on the bus 20.
And the external storage device 25 is also connected. CPU21
Controls various operations of this electronic musical instrument by executing various programs including a program described later. Timer 22
Is used for time measurement. The ROM 23 stores various programs and various data. The RAM 24 stores various programs and also temporarily stores variables such as various data and various flags necessary for executing various programs.

The external storage device 25 is a hard disk HD which is built in the electronic musical instrument in advance, a compact disk CD which can be mounted on the electronic musical instrument, a mini disk MD,
It includes various recording media such as a flexible disk FD and a drive unit for each recording medium, and can store and read a large amount of data and programs.

A digital interface circuit 31 and an analog interface circuit 32 are also connected to the bus 20. An external digital device 33 is connected to the digital interface circuit 31, and performance data (midi data), digital musical tone signals, etc. are input from the external digital device 33. As the external digital device 33, a keyboard device that outputs performance data, a sequencer, a personal computer, or the like is adopted, and an electronic musical instrument, a rhythm machine, a personal computer, or the like that outputs a digital musical tone signal is used. An external analog device 34 is connected to the analog interface circuit 31, and an analog musical tone signal is input from the external analog device 34. As the external analog device 34, an electronic musical instrument that outputs an analog musical tone signal, a rhythm machine, a personal computer, various audio devices, or the like is adopted.

Next, an example of the digital signal processing circuit 18 will be described. As described above, the digital signal processing circuit 18 includes a register (RAM), an arithmetic circuit, a D / A converter,
It is composed of a program memory and the like, and its operation is controlled by a micro program stored in the program memory, and exhibits various functions.

An example of the function of the digital signal processing circuit 18 applied to the present invention will be described with reference to the functional block diagram of FIG. 2. The circuit 18 has a serial connection between its input terminal IN and output terminal OUT. Connected bit rate converter (bit number converter) 51, sampling frequency converter (sampling rate converter) 52, multi-band equalizer unit (frequency characteristic converter) 53, and D / A converter 5
It is equipped with 4.

The bit rate converter 51 converts the bit rate (bit number) of the input digital musical tone signal into the input bit rate as a control parameter and outputs it. That is, an input digital musical tone signal represented by various bit rates is converted into a digital musical tone signal represented by a bit rate inputted as a control parameter and outputted.

The sampling frequency (sampling rate) converter 52 converts the sampling frequency (sampling rate) of the input digital musical tone signal into the sampling frequency input as a control parameter and outputs it. That is, a digital tone signal composed of sampling data sampled at various sampling frequencies is converted into a digital tone signal composed of sampling data resampled at the sampling frequency input as a control parameter and output.

The multi-band equalizer unit 53 has a plurality of built-in digital filters and converts the frequency characteristic of the input digital tone signal according to the frequency characteristic data input as a control parameter and outputs it. That is, the digital musical tone signals having various frequency characteristics are converted into digital musical tone signals having the frequency characteristics represented by the frequency characteristic data input as the control parameters and output. The D / A converter 54 D / A converts the input digital musical tone signal and outputs it.

The parameter sets stored in the parameter storage unit 55 are supplied to the respective conversion units 51 to 53 via the parameter output unit 56. The parameter storage unit 55 includes the bit rate conversion unit 5
1. A plurality of parameter sets each including a combination of three types of parameters including a bit rate, a sampling frequency, and frequency characteristic data that determine each signal processing characteristic of the sampling frequency conversion unit 52 and the multiband equalizer unit 53 are used as templates in advance. I remember.

In this case, as the bit rate, for example, 8 bits, 12 bits, 16 bits, etc. are prepared, and one of them is selected as one parameter of each parameter set. The sampling frequency is, for example, 48 KHz, 44.1 KHz, 32 KH
z, 22.05 KHz, etc. are prepared, and one sampling frequency among them is selected as one parameter of each parameter set. As the frequency characteristic data, for example, data representing each frequency characteristic shown in FIGS. 3A to 3C is prepared, and the frequency characteristic data representing one frequency characteristic among them is used as one parameter of each parameter set. To be selected. It should be noted that each of these parameter sets can obtain a musical tone similar to a musical tone having a unique texture output from various models (vintage ones) such as existing old musical tone signal forming devices and musical tone signal processing devices. As described above, it may be set in the parameter storage unit 55 in advance or written in the storage unit 55 thereafter.

Further, as the parameter storage unit 55, R which is built in the digital signal processing circuit 18 of FIG. 1 is used.
A part of the storage area of the OM and the RAM may be adopted, or a part of the storage area of the ROM 23 and the RAM 24 which configure the computer main body and the external storage device 25 may be adopted.

The parameter output unit 56 performs bit rate conversion on a set of parameter sets read from the parameter storage unit 55, a set of parameter sets obtained by modifying a part of the set of parameters, or a set of parameters separately input. Output to the unit 51, the sampling frequency conversion unit 52, and the multiband equalizer unit 53, respectively.

The parameter storage unit 55 and the parameter output unit 56 are controlled by the control unit 57. The control unit 57 includes a parameter selection unit 57.
a, parameter changing unit 57b, parameter writing unit 57
c and a parameter setting unit 57d. Each of these units 57a to 57d is related to the display state of the display 13, and the parameter storage unit 55 and the parameter output unit 5 according to the operation of one of the setting operators of the setting operator group 12.
Control 6 as follows. In this case, the display 13
Displays the bit rate, the sampling frequency, and the frequency characteristic, and also displays various operation instructions to the user.

The parameter selecting unit 57a selects one set of parameters from a plurality of parameter sets stored in the parameter storage unit 55 by operating the setting operator group 12, and outputs the selected parameter set to the parameter output unit 56. Then, the parameter output unit 56 outputs the output parameter set as it is to the respective conversion units 51 to 53.
The parameter storage unit 55 and the parameter output unit 56 are controlled. The parameter changing unit 57b includes the setting operator group 12
By operating the parameter output unit 56, a part of the set of parameter sets input to the parameter output unit 56 is changed, and the changed set of parameter sets is output to the conversion units 51 to 53. Control 56.

The parameter writing unit 57c newly sets one set of parameters by operating the setting operator group 12, writes the set one set of parameters in the parameter storage unit 55, and sets the parameters. The parameter storage unit 55 is controlled so as to add. The parameter setting unit 57d newly sets one set of parameters by operating the setting operator group 12 regardless of the parameter set stored in the parameter storage unit 55, and sets the set parameter set. Each conversion unit 51-5
The parameter output unit 56 is controlled so as to output to the No. 3.

Next, the operation of the embodiment configured as described above will be described. When the user operates the performance operator group 11 to start a performance, the performance data representing the operation of the performance operator group 11 is supplied to the tone generator circuit 14 by program control (not shown). The tone generator circuit 14 forms a digital tone signal composed of a plurality of bits representing a tone waveform in accordance with the supplied performance data, and supplies the digital tone signal to the digital signal processing circuit 18.

In the digital signal processing circuit 18,
Bit rate converter 51, sampling frequency converter 5
2 and the multi-band equalizer section 53 respectively convert the bit rate, sampling frequency and frequency characteristic of the digital musical tone signal based on the supplied parameter set, and the D / A converter 54 converts the converted digital musical tone. The signal is D / A converted and output. The D / A converted analog tone signal is supplied to the sound system 19 and is sounded from the sound system 19 as a tone.

Further, in this electronic musical instrument, instead of the user operating the performance operator group 11, the external digital device 33 to the digital interface circuit 3 is used.
Performance data can also be input to 1. In this case, the input performance data is supplied to the tone generator circuit 14 via the bus 20 by program control (not shown). The tone generator circuit 14 forms a digital musical tone signal corresponding to the performance data input from the external digital device 33 and supplies it to the digital signal processing circuit 18, similarly to the case where the performance operator group 11 is operated for performance. . Similarly to the case described above, the digital signal processing circuit 18 also performs digital signal processing on the input digital musical tone signal and outputs D /
A conversion is performed, and a sound is produced as a musical sound through the sound system 19.

In this electronic musical instrument, a series of digital musical tone signals can be input from the external digital device 33 to the digital interface circuit 31. In this case, the digital tone signal input to the digital interface circuit 31 is directly supplied to the digital signal processing circuit 18 via the bus 20 by program control (not shown). This digital tone signal is digital signal processed by the digital signal processing circuit 18, D / A converted, and sounded as a tone from the sound system 19, as in the case described above.

Further, in this electronic musical instrument, a series of analog musical tone signals can be input from the external analog device 34 to the analog interface circuit 32. In this case, the analog interface circuit 32 performs A / D conversion on the input analog musical tone signal, and the digital musical tone signal converted by the A / D conversion is performed on the digital signal processing circuit 1 via the bus 20 by program control (not shown).
Supply to 8. This digital tone signal is digital signal processed by the digital signal processing circuit 18, D / A converted, and sounded as a tone from the sound system 19 as in the case described above.

Further, in this electronic musical instrument, a series of performance data supplied from the external digital device 33 is stored in the external storage device 25, or a series of performance operations by the performance operation group 11 of the electronic musical instrument is performed. It is also possible to store the performance data in the external storage device 25 and generate a musical tone according to the stored performance data. In this case, a series of performance data stored in the external storage device 25 is sequentially read out by program control (not shown) and supplied to the tone generator circuit 14 via the bus 20. Then, the tone generator circuit 14 forms a digital musical tone signal, the digital signal processing circuit 18 subjects the digital musical tone signal to digital signal processing, and D / A.
It is the same as the above-mentioned point in that it is converted and is sounded as a musical sound from the sound system 19.

A series of digital musical tone signals supplied from the external digital device 33 and the external analog device 34.
The analog musical tone signal supplied from the A / D converter 32 is used for A / D conversion, and the digital musical tone signal formed by the tone generator circuit 14 of this electronic musical instrument is stored in the external storage device 25. It is also possible to pronounce the stored digital musical tone signal as a musical tone. In this case, a series of digital musical tone signals stored in the external storage device 25 are sequentially read out by the program control (not shown), and the bus 20
The signal is supplied to the digital signal processing circuit 18 via. Then, in the digital signal processing circuit 18, the sequentially read digital musical tone signals are subjected to digital signal processing and D / A conversion.
The point of being pronounced as a musical tone from 9 is the same as in the above case.

As described above, the digital tone signals input to the digital signal processing circuit 18 in various forms are processed by the digital signal processing circuit 18, that is, by the bit rate conversion unit 51, the sampling frequency conversion unit 52 and the multi-band equalizer unit 53. Digital signal processing is performed. In this case, the user operates the setting operator group 12,
By the operation control of the parameter selection unit 57a, one of the plurality of parameter sets stored in the parameter storage unit 55 in advance is used as a parameter set via the parameter output unit 56 to the bit rate conversion unit 51 and the sampling frequency conversion unit. 52 and multi-band equalizer section 53
Can be supplied to.

According to this, the user simply selects any one of the plurality of parameter sets stored in the parameter storage unit 55,
The bit rate, sampling frequency and frequency characteristic of the digital musical tone signal can be converted according to the selected set of parameters. Therefore, the user can select a set of parameters for giving a unique texture similar to the musical tone signal formed or processed by an old model (vintage), and the musical tone having the unique texture can be obtained. You can get a good musical sound. as a result,
With a simple configuration and simple operation, it is possible to obtain various musical tone signals having a unique texture similar to the musical tone signals formed or processed by old models, and satisfy music lovers who like this kind of musical tone. Will be able to.

Further, the user operates the setting operator group 12 to change a part of the set of parameters read from the parameter storage unit 55 as described above by the operation control of the parameter changing unit 57b, The changed parameter set may be supplied to the bit rate conversion unit 51, the sampling frequency conversion unit 52, and the multiband equalizer unit 53 via the parameter output unit 56.

According to this, a part of the parameter set prepared in advance is changed so that the digital signal processing circuit outputs the digital musical tone signal converted according to the changed one set of parameters. be able to. Therefore, it is possible to easily obtain a musical tone in which various musical tone signals having a unique texture similar to the musical tone signal formed or processed by the old model as described above are somewhat arranged, and further satisfy the music lover. Will be able to.

Further, the user operates the setting operator group 12 to control the operation of the parameter setting unit 57d so that a newly set unique set of parameters is transmitted via the parameter output unit 56 to the bit rate conversion unit. 51, the sampling frequency conversion unit 52, and the multi-band equalizer unit 53 may be supplied. According to this, it is possible to output from the digital signal processing circuit a digital tone signal that has been converted according to a set of parameters that the user has independently set. Therefore, it is possible to easily generate various musical tones having a unique texture set by the user.

Further, the user can operate the setting operator group 12 to additionally store one set of parameters in the parameter storage unit 55 by controlling the operation of the parameter writing unit 57c. According to this, the parameter set for generating the musical sound desired by the user can be easily added to the parameter storage unit 55, so that the functional enhancement of the digital signal processing circuit 18 can be easily realized.

Next, another example of the function of the digital signal processing circuit 18 applied to the present invention will be described with reference to the functional block diagram of FIG. 4. The circuit 18 has its input terminal IN and output terminal OUT. In between, a convolution operation unit 61 and a D / A converter 62 connected in series are provided.

The convolution operation section 61 executes a convolution operation on the input digital musical tone signal using the impulse response waveform data input as a control parameter, and outputs the result. The D / A converter 62, like the D / A converter 54 of the above-described example, D / A-converts the input digital musical tone signal.
A-convert and output.

The parameter set stored in the parameter storage unit 63 is supplied to the convolution operation unit 61 via the parameter output unit 64. The parameter storage unit 55 stores the impulse response waveform (see FIG. 5 (A)).
A plurality of parameter sets respectively representing (see (B)) are stored as templates. Note that each of these parameter sets can be used, for example, by inputting an impulse waveform into various models (vintage ones) such as existing old tone signal forming devices and tone signal processing devices, and using impulse response waveforms output from the same model. Obtainable. As a result, the parameter set favorably represents the characteristics of the musical sound output from the model and having a unique texture.

Further, as the parameter storage section 63, R built in the digital signal processing circuit 18 of FIG. 1 is used.
The ROM 23 and the RAM 2 that employ a part of the storage areas of the OM and the RAM or that configure the computer main body
4 and that a part of the storage area of the external storage device 25 is adopted is similar to the case of the above-described example.

The parameter output unit 64 stores in the convolution operation unit 61 a set of parameter sets (impulse response waveform data) read from the parameter storage unit 63 or a set of parameter sets obtained by modifying a part of the parameter set. Output.

The parameter storage unit 63 and the parameter output unit 64 are also the control unit 65 as in the above-described example.
It is controlled by. The control unit 65 includes a parameter selecting unit 65a, a parameter changing unit 65b, and a parameter writing unit 65c. Each of these units 65a to 65c also controls the parameter storage unit 63 and the parameter output unit 64 in accordance with the operation of one of the setting operators of the setting operator group 12 in relation to the display state of the display device 13. In this case, the display 13 displays the impulse response waveform and also various operating instructions to the user.

The parameter selector 65a selects one parameter set from a plurality of parameter sets (impulse response waveform data) stored in the parameter storage 55 by operating the setting operator group 12. The parameter output unit 64 outputs the parameter output unit 64.
The parameter storage unit 63 and the parameter output unit 64 are controlled so that the parameter set that is output as is output to the convolution operation unit 61 as it is. The parameter changing unit 65b changes a part of the one set of parameters input to the parameter output unit 64 by operating the setting operator group 12, and outputs the changed parameter set to the convolution operation unit 61. So that the parameter output unit 64
To control. The parameter writing unit 65c newly sets one set of parameters (impulse response waveform data) by operating the setting operator group 12, writes the set parameter set in the parameter storage unit 63, and sets the parameters. Parameter storage unit 6 so that
Control 3

Next, the processing of a digital tone signal using the convolution operation unit 61 having the above-mentioned configuration will be described.

As described above, the digital tone signal input to the digital signal processing circuit 18 in various forms is subjected to the convolution operation by the convolution operation section 61 using a set of parameter sets (impulse response waveform data) and output. It In this case, the user operates the setting operator group 12 to control one of the plurality of parameter sets (impulse response waveform data) stored in advance in the parameter storage unit 63 by the operation control of the parameter selection unit 65a. The parameter set can be supplied to the convolution operation unit 61 via the parameter output unit 64.

According to this, the user only needs to select one of the plurality of parameter sets stored in the parameter storage unit 55,
The digital musical tone signal is subjected to the convolution operation processing using the selected one set of parameters. In this case, for example, if impulse response waveform data formed based on various types (vintage) of existing old tone signal forming devices and tone signal processing devices are stored in the parameter storage unit 63 as a parameter set, It is possible to obtain a musical sound similar to the musical sound having a unique texture obtained by the model. As a result, according to the present invention, it is possible to obtain various musical tone signals having a unique texture similar to the musical tone signals formed or processed by the old model with a simple configuration and simple operation. You will be able to satisfy music lovers who like.

Further, the user operates the setting operator group 12 to change a part of the parameter set (impulse response waveform data) read from the parameter storage section 63 as described above by the operation control of the parameter changing section 65b. do it,
The changed parameter set is the parameter output unit 64.
It can be also supplied to the convolution operation unit 61 via. Therefore, also in this case, it is possible to easily obtain a musical tone in which various musical tone signals having a unique texture similar to the musical tone signal formed or processed by the above-described old model are arranged to some extent, and the music lover Will be more satisfied.

The user can additionally store a new parameter set (impulse response waveform data) in the parameter storage section 63 by operating the setting operator group 12 and controlling the operation of the parameter writing section 65c.
According to this, a parameter set for generating a musical sound preferred by the user can be easily added to the parameter storage unit 63, so that the function of the digital signal processing circuit 18 can be easily improved.

In the above embodiment, the digital signal processing circuit 18 is provided with a bit rate conversion function,
It has been described that either the sampling frequency conversion function and the multi-band equalizer function are provided, or the convolution operation function is provided. However, for the digital signal processing circuit 18, a bit rate conversion function,
In addition to the sampling frequency conversion function and the multi-band equalizer function, a convolution operation function may be provided at the same time. In this case, the functional block of FIG. 5 may be connected to the functional block of FIG. 2 in series. According to this, the characteristic of the musical tone can be changed more freely, so that the musical tone by the old model (vintage type) can be better imitated and the complex and rich musical tone can be generated.

In the above embodiment, an example in which the digital signal processing device according to the present invention is applied to an electronic musical instrument has been shown, but this digital signal processing device is equivalent to the digital signal processing circuit 18 of the above embodiment. Circuit, that is, a circuit device capable of realizing a bit rate conversion function, a sampling frequency conversion function, a multiband equalizer function, or a convolution operation function. Therefore, the digital signal processing device according to the present invention can be widely applied to various devices as long as it is a device for processing digital musical tone signals such as various audio equipments and personal computers.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an electronic musical instrument including a digital signal processing circuit according to an embodiment of the present invention.

FIG. 2 is a functional block diagram showing an example of functions of the digital signal processing circuit of FIG.

3A to 3C are graphs showing frequency characteristics of a digital musical tone signal controlled by the multiband equalizer unit of FIG.

FIG. 4 is a functional block diagram showing another example of functions of the digital signal processing circuit of FIG.

5A and 5B are waveform diagrams showing impulse response waveforms used in the convolution operation unit in FIG.

[Explanation of symbols]

11 ... Performance operator group, 12 ... Setting operator group, 13 ... Display device, 14 ... Sound source circuit, 18 ... Digital signal processing circuit,
21 ... CPU, 23 ... ROM, 24 ... RAM, 25 ... External storage device, 51 ... Bit rate conversion unit, 52 ... Sampling frequency conversion unit, 53 ... Multi-band equalizer unit, 54, 62 ... D / A conversion unit, 55 , 63 ... Parameter storage unit, 56, 64 ... Parameter output unit, 57, 65
... control unit, 57a, 65a ... parameter selection unit, 57
b, 65b ... Parameter changing section, 57c, 65c ... Parameter writing section, 57d ... Parameter setting section, 61 ... Convolution operation section.

Claims (4)

[Claims] 1. A musical tone signal processing apparatus for inputting a digital musical tone signal having a plurality of bits representing a musical tone waveform and outputting the inputted digital musical tone signal through a digital signal processing circuit for processing the digital signal. The processing circuit includes at least two of a bit rate converter for converting the bit rate of the digital musical tone signal, a sampling frequency converter for converting the sampling frequency of the digital musical tone signal, and a frequency characteristic converter for converting the frequency characteristic of the digital musical tone signal. A parameter storage unit configured to include one conversion unit, storing a plurality of parameter sets each including a combination of at least two types of parameters that respectively determine the signal processing characteristics of the at least two conversion units; In response to the operation Selection means for selecting any one parameter set from a plurality of parameter sets stored in the parameter storage means, and simultaneously supplying the selected one parameter set to the at least two converters, respectively. And a digital tone signal processing device for outputting a digital tone signal converted by the at least two converters according to the selected one set of parameters. 2. The tone signal processing apparatus according to claim 1, wherein a part of one set of parameters selected by the selecting means is changed in response to a change operation by a user, and the at least two sets are set. A musical tone signal processing apparatus, characterized in that a correction means for supplying to one converter is provided. 3. A plurality of impulses in a musical tone signal processing apparatus for inputting a digital musical tone signal having a plurality of bits representing a musical tone waveform and outputting the inputted digital musical tone signal through a convolutional arithmetic processing circuit for performing convolutional arithmetic processing. Impulse response waveform data storage means for storing a plurality of impulse response waveform data respectively representing response waveforms, and a plurality of impulse response waveform data stored in the impulse response waveform data storage means in response to a user's selection operation. And selecting means for selecting any one of the impulse response waveform data and supplying the selected one impulse response waveform data to the convolution operation processing circuit, according to the selected one impulse response waveform data. The convolution calculation processing circuit is used to perform the convolution calculation processing. Tone signal processing device is characterized in that so as to output a barrel tone signal. 4. The tone signal processing apparatus according to claim 1, wherein a part of one impulse response waveform data selected by the selecting means is changed in response to a change operation by a user, and the convolution is performed. A musical tone signal processing apparatus, characterized in that correction means for supplying the arithmetic processing circuit is provided.