JP4137260B2 - Effect device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an effect device, and more particularly, to an effect device capable of adding an effect to a musical sound signal.
[0002]
[Prior art]
In general, in the field of electronic musical instruments, a musical sound signal is amplified using an amplifying device, and the amplified musical sound signal is emitted into a space as a musical sound through a speaker.
[0003]
FIG. 1 shows an example of a sound system including the amplification device and the speaker as described above. The sound system includes an amplifier 100, a power amplifier 102, and a speaker 104. It is configured.
[0004]
Here, the amplifier 100 inputs a musical tone signal from an input terminal, amplifies the inputted musical tone signal, and outputs the amplified musical tone signal to the power amplifier 102.
[0005]
The power amplifier 102 receives the musical sound signal output from the amplifier 100, amplifies the input musical sound signal, and outputs it to the speaker 104. The power amplifier 102 is supplied with + B (V) and −B (V) as power supply voltages.
[0006]
Furthermore, the speaker 104 receives the musical sound signal output from the power amplifier 102, converts the musical sound signal into a musical sound, and emits the sound into the space.
[0007]
With the above configuration, in the sound system shown in FIG. 1, the musical sound signal input to the input terminal is amplified by the amplifier 100 and the power amplifier 102 and emitted to the space as musical sound by the speaker 104. Become.
[0008]
However, in the above sound system, the maximum amplitude value of the system is determined by the power supply voltage (+ B, -B) supplied to the power amplifier 102, and the maximum output sound pressure is limited by this power supply voltage. As a result, in terms of hearing, the increase in volume is limited.
[0009]
That is, when the tone signal input to the sound system is a tone signal having a sharp rising portion and a decay portion that are characteristic in, for example, a percussion instrument, a plucked instrument, or a percussion instrument, the maximum of the tone signal When the amplitude value exceeds the power supply voltage (+ B, -B) supplied to the power amplifier 102, the musical sound signal amplified by the power amplifier 102 is shown in FIG. A portion of the waveform that exceeds the power supply voltage (+ B, −B) supplied to the power amplifier 102 (broken line portion in FIG. 2) is limited by the power supply voltage (+ B, −B) supplied to the power amplifier 102. As a result, the volume of the audible sound cannot be increased as much as expected.
[0010]
That is, the amplitude of the musical tone signal is closely related to the volume of the musical tone generated based on the musical tone signal. The larger the musical tone signal, the larger the volume of the musical tone. When the maximum amplitude value of the tone signal amplified by the supplied power supply voltage is limited, the increase in the volume level of the tone generated based on the tone signal is also limited accordingly.
[0011]
As described above, when a musical tone signal is amplified using an amplification device, and a musical tone is generated based on the amplified musical tone signal and emitted into the space, the maximum amplitude value of the musical tone signal is limited by the amplification device. As a result, there is a problem in that the increase in the volume level of the musical sound generated based on the musical sound signal is also limited.
[0012]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to amplify a tone signal using an amplifying device and based on the amplified tone signal. When generating a musical sound and releasing it into the space, even if the maximum amplitude value of the musical sound signal is limited by the amplification device, the volume feeling as if the musical signal was amplified beyond the limited maximum amplitude value It is an object of the present invention to provide an effect device capable of obtaining an increase in the above.
[0013]
In particular, according to the present invention, in an amplifying apparatus such as a power amplifier whose output is determined by a power supply voltage, it is possible to obtain a sound volume feeling that the power supply voltage is higher than the power supply voltage actually supplied. It is intended to provide an effect device.
[0014]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the effect device according to the present invention has been made by paying attention to the result of the experiment of the time-axis expansion processing of the musical sound signal by the applicant of the present application to extend the waveform of the musical sound signal in the time-axis direction. is there.
[0015]
Here, a detailed description will be given of the above-described experiment of the time-axis expansion processing of the musical tone signal by the applicant of the present application. With respect to the musical sound signal, a time axis expansion process is performed in which the waveform is expanded in the time axis direction in the vicinity of the rising portion of the waveform of the musical sound signal.
[0016]
As a result of the experiment of the time axis extension process described above, even if the musical sound signal that has been subjected to the time axis extension process and the music signal that has not been subjected to the time axis extension process have the same maximum amplitude value, In other words, the musical sound signal that has been subjected to the time axis expansion process has a greater audible volume feeling when the musical sound is generated based on the musical sound signal that has not been subjected to the time axis expansion process. found.
[0017]
In other words, the effect device according to the present invention, in view of the results of the above-described experiment, performs a time axis expansion process on the musical sound signal even when the maximum amplitude value of the musical sound signal is limited. It is intended to realize an increase in
[0018]
That is, the invention according to claim 1 of the present invention is an effect device for adding an effect to an input musical sound signal. An envelope signal of the input musical sound signal is detected, a portion of the envelope signal exceeding a predetermined level is extracted, and a portion corresponding to the extracted envelope portion of the input musical sound signal is expanded in time axis An expansion coefficient generating means for generating an expansion coefficient to be generated, and based on the expansion coefficient Time axis extension means for extending the time axis of the input musical sound signal When It is made to have.
[0019]
Therefore, according to the first aspect of the present invention, the predetermined portion of the musical sound signal is expanded in time axis by the time axis extending means, and the musical sound signal is amplified using the amplifying device. When a musical sound is generated based on the amplified musical sound signal and emitted into the space, the musical sound signal is restricted even if the maximum amplitude value of the musical sound signal is restricted by the amplification device. Thus, it is possible to obtain an increase in volume feeling that is amplified beyond the maximum amplitude value.
[0020]
More specifically, according to the invention described in claim 1 of the present invention, even in an amplifying apparatus such as a power amplifier whose output is determined by a power supply voltage, a power supply that is higher than the power supply voltage that is actually supplied. A feeling of volume as if operating with voltage can be obtained.
[0021]
Moreover, invention of Claim 2 among this invention is the following. Invention of Claim 1 among this invention In Further, the time axis was extended by the time axis extension means. Limiter processing means for limiting the level of the musical sound signal to a predetermined level or less is provided.
[0022]
Therefore, according to the invention described in claim 2 of the present invention, The time axis was extended by the time axis extension means. Music signal level The Limited to a predetermined level or less by limiter processing means You It can be.
[0024]
The invention according to claim 3 of the present invention is the invention according to claim 2 of the present invention. The expansion coefficient generation means generates a gate signal indicating whether or not the input musical sound signal is equal to or higher than the predetermined level, and based on the gate signal, the musical sound signal output from the time axis expansion means, or Selection output means for selecting and outputting one of the input musical sound signals; It is what you have.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of an effect device according to the present invention will be described in detail with reference to the accompanying drawings.
[0030]
However, in the waveform diagrams shown in FIGS. 7, 8 and 10, the waveform of the musical sound signal is shown by its envelope in order to simplify and simplify the drawings.
[0031]
Here, FIG. 3 is a block diagram showing the overall configuration of a sound system provided with the effect device according to the present invention. This sound system is output from an electric stringed instrument such as an electric guitar. It is suitable for use as a sound system for an electric stringed instrument that amplifies and emits a musical sound signal.
[0032]
In the configuration shown in FIG. 3, the same or equivalent configuration as the configuration shown in FIG. 1 is denoted by the same reference numeral as in FIG. 1, and the detailed description thereof is omitted.
[0033]
The sound system shown in FIG. 3 amplifies an analog tone signal (hereinafter referred to as an “analog tone signal”) input from an input terminal and outputs the amplified signal. The analog tone signal is converted into a digital tone signal (hereinafter referred to as “digital tone signal” where appropriate), that is, an analog / digital converter (A / D) 10 for converting into waveform data, and an analog / digital signal. A digital signal processor (Digital Signal Processor: DSP) 12 that outputs a digital musical tone signal (waveform data) output from the digital converter 10 after applying an effect; The digital musical tone signal (waveform data) processed and output by the DSP 12 is converted into an analog musical tone signal. A digital / analog converter (D / A) 14 that converts the output into a digital signal and a power amplifier 102 that amplifies and outputs the analog tone signal output from the digital / analog converter 14 (+ B (V) as a power supply voltage) And -B (V)), and a speaker 104 that emits sound into the space as a musical sound that can be heard from the analog musical sound signal output from the power amplifier 102.
[0034]
That is, in this embodiment, the effect device according to the present invention is realized by the DSP 12 under the control of software.
[0035]
In the above configuration, the analog musical tone signal input from the input terminal is amplified by the amplifier 100, and the amplified analog musical tone signal is converted into a digital musical tone signal (waveform data) by the analog / digital converter 10 for analog / digital conversion. Is output from the device 10 to the DSP 12.
[0036]
Then, the DSP 12 that implements the effect device according to the present invention performs time-axis expansion processing for extending the waveform of the digital musical sound signal in the time-axis direction, and has the effect of increasing the audible volume feeling for the digital musical sound signal. Will be added.
[0037]
The digital tone signal to which the effect is added by the DSP 12 is converted into an analog tone signal by the digital / analog converter 14 and output to the power amplifier 102.
[0038]
Then, the analog signal output from the digital / analog converter 14 is power amplified by the power amplifier 102 and output to the speaker 104, and the analog musical signal amplified by the power amplifier 102 is converted into a musical sound by the speaker 104 as a musical sound. Sound will be emitted.
[0039]
FIG. 4 is a block diagram showing an example of a functional configuration of the DSP 12 that realizes the effect device according to the present invention.
[0040]
That is, the DSP 12 is configured to include a time axis expansion unit 20, an expansion coefficient generation unit 22, and a limiter processing unit 24.
[0041]
Here, the time axis extension means 20 receives the digital musical tone signal (waveform data) output from the analog / digital converter 10 and extends a part of the waveform of the digital musical tone signal in the time axis direction in real time. The time axis expansion process is performed, and the expansion coefficient indicating the ratio of the time axis expansion in the time axis expansion process is supplied by the expansion coefficient generation means 22.
[0042]
Hereinafter, the details of the time axis extension means 20 will be described with reference to FIGS.
[0043]
That is, FIG. 5 is a block diagram showing the overall configuration of the time axis extension means 20, and the time axis extension means 20 temporarily stores the input digital musical tone signal (waveform data). The storage unit 202 and the time axis extension processing unit 204 are configured.
[0044]
Here, the time-axis expansion processing means 204 is configured by a conventionally known time-axis compression / expansion processing apparatus, and its constituent elements are a reading means 206 that reads and outputs waveform data according to the expansion coefficient. Conversion means 208 that converts the expansion coefficient into a pitch conversion amount and outputs it; and pitch conversion means 210 that converts the pitch of the waveform data output from the reading means 206 according to the conversion amount output from the conversion means 208 and outputs it. And.
[0045]
Since the time axis expansion processing means 204 performs only the time axis expansion processing, only the function of the time axis expansion processing is used among the functions of the conventionally known time axis compression / expansion processing devices. The function of time axis compression processing is not used.
[0046]
Hereinafter, the operation of the conventional time axis expansion processing unit 204 will be described. In order to facilitate understanding, the reading unit 206 reads waveform data from a waveform memory in which waveform data is stored.
[0047]
Here, a case where the waveform data is not expanded on the time axis is first examined. In this case, the expansion coefficient is set to 1.
[0048]
In this way, when the expansion coefficient is set to 1, the reading means 206 reads the waveform memory by incrementing the read address by 1 for each sampling period, and waveform data that is not expanded in the time axis direction ( The original waveform data stored in the waveform memory) is read out.
[0049]
On the other hand, when the waveform data is expanded on the time axis, the expansion coefficient may be set to a value smaller than 1.
[0050]
In this way, when the expansion coefficient is set to a value smaller than 1, the reading means 206 reads the waveform memory by incrementing the reading address by a value smaller than 1 every sampling period, and stores it in the waveform memory. Waveform data obtained by extending the stored original waveform data in the time axis direction is read out.
[0051]
By the way, since the expanded waveform data read by the reading unit 206 has a pitch lower than that of the original waveform data, the pitch conversion unit 210 provided at the subsequent stage of the reading unit 206 causes the original waveform data to be extracted from the original waveform data. The pitch drop will be corrected.
[0052]
That is, the pitch conversion unit 210 is supplied with a pitch conversion amount corresponding to the expansion coefficient from the conversion unit 208, and the pitch conversion unit 210 converts the pitch of the expanded waveform data according to the pitch conversion amount. As a result, a process of increasing the pitch by a pitch lowered from the original waveform data is performed.
[0053]
Therefore, according to the time axis expansion processing means 204 described above, the time axis expansion processing of the original waveform data can be performed without changing the pitch of the original waveform data.
[0054]
In the case where the readout address in the readout means 206 is not an integer, that is, in the case of the readout address of the decimal point expression, the waveform data may be read out by interpolation operation that has been widely performed conventionally. .
[0055]
Further, the configuration of the time axis extension processing means 204 is not limited to the above-described one, and other known time axis extension processing devices and time axis compression / extension processing devices can be used as appropriate.
[0056]
Next, in order to perform the time axis extension processing of the waveform data in real time using the time axis extension processing means 204 as described above, the reading means 206 has a waveform as shown in the time axis extension means 20 of the present invention. Temporary storage means 202 may be used as a waveform memory for reading data.
[0057]
Here, the temporary storage means 202 can be configured by, for example, a ring memory as shown in FIG.
[0058]
In the ring memory shown in FIG. 6, the write address WA _n (However, “n” is a positive integer.) The waveform data sequentially input is stored and the write address WA is stored. _n Is incremented by one address in the direction of arrow H for each sampling period.
[0059]
In addition, such a write address WA _n Is delayed by a predetermined delay time d1 behind the read address RA. _n Shall advance.
[0060]
Note that the predetermined delay time d1 is the waveform data used in the time-axis expansion processing means 204 is the write address WA. _n Is set so as not to exceed.
[0061]
However, in the time axis extension means 20 according to the present invention, as will be described in detail later, the read address RA per sampling period _n Is the write address WA per sampling period. _n Therefore, the waveform data used in the time-axis expansion processing means 204 is the write address WA. _n Therefore, the predetermined delay time d1 may be set to 0 (no delay).
[0062]
Here, the read address RA for each sampling period _n The step amount is determined by the expansion coefficient. Details of the generation of the expansion coefficient will be described later. When the expansion coefficient is 1, the read address RA _n Advances one by one in the direction of arrow H in FIG. 6, and when the expansion coefficient is smaller than 1, the read address RA _n Is a step smaller than 1 in the direction of arrow H in FIG.
[0063]
Therefore, when the expansion coefficient is 1, the read address RA _n Is the write address WA _n Therefore, the waveform data that has not been expanded in time axis is read out.
[0064]
When the expansion coefficient is smaller than 1, the read address RA _n Is the write address WA _n Therefore, the waveform data in which the waveform is expanded in the time axis direction is read out.
[0065]
Then, as described above, the waveform data that has been subjected to the time axis expansion processing read by the reading unit 206 has a lower pitch than the waveform data (original waveform data) before the time axis expansion processing. Pitch conversion means 210 provided in the subsequent stage performs pitch conversion for correcting a drop in pitch from the original waveform data and outputs the result.
[0066]
Further, as described above, the conversion unit 208 converts the expansion coefficient into a pitch conversion amount and outputs it to the pitch conversion unit 210, while the time axis expansion of the waveform data in the reading unit 206 is based on the expansion coefficient. Therefore, the conversion unit 208 converts the expansion coefficient into a pitch conversion amount and outputs it to the pitch conversion unit 210, so that the pitch conversion unit 210 has a waveform expanded according to the pitch conversion amount. The data pitch can be converted, and correction processing is performed to increase the pitch by a pitch that is lower than the original waveform data. It can be returned to the pitch.
[0067]
In the above configuration, the operation of the time axis extension means 20 described above will be described with reference to the waveform diagram shown in FIG.
[0068]
First, input waveform data (see FIG. 7A), which is waveform data output from the analog / digital converter 10, is used as a write address WA of the ring memory serving as the temporary storage means 202. ₁ Shall be written sequentially.
[0069]
Then, the waveform data written in the ring memory is delayed by the delay time d1 by the reading means 206 and the read address RA of the ring memory. ₁ Are sequentially read out and output to the pitch converting means 210 (see FIG. 7B).
[0070]
Here, an expansion coefficient (see FIG. 7C) that changes on the time axis is supplied from the expansion coefficient generation means 22 to the reading means 206. Based on this expansion coefficient, first, an interval where the expansion coefficient is 1 At T1, the read address RA _n In step T1, waveform data that has not been expanded in time axis is output. Next, in a section T2 in which the expansion coefficient is less than 1, the read address RA is output. _n In step T2, the waveform data expanded in the time axis is output, and in the interval T3 where the expansion coefficient is 1, the read address RA is reduced. _n In step T3, waveform data that has not been expanded in time axis is output.
[0071]
The waveform data (see FIG. 7 (b)) output from the reading means 206 as described above has a lower pitch in the portion of the time axis expanded (the portion corresponding to the section T2 in FIG. 7 (b)). Has been shifted to.
[0072]
Accordingly, if the pitch shift is corrected by the pitch conversion unit 210 in accordance with the pitch conversion amount from the conversion unit 208, there is no pitch shift compared to the input waveform data before extending the time axis. In addition, waveform data expanded in time axis can be obtained in real time.
[0073]
Regarding the delay time, the delay time d1 in the section T1 is the delay time d2 when the expansion coefficient returns to 1 from a value smaller than 1 (from the section T2 to the section T3). It is getting bigger. That is, the write address WA ₁ More advanced write address WA ₂ The waveform data written to the read address RA ₂ When reading from, the delay time is larger than the delay time d1 and the delay time d2.
[0074]
As described above, when the waveform data is expanded on the time axis, the delay time is integrated every time the waveform data is expanded on the time axis, and the delay time becomes large.
[0075]
In the effect device according to the present invention, although not shown, in order to suppress the increase in the delay time described above, the initial delay time d1 is reset every time a sudden rise (attack portion) of the waveform data is detected. It is made to do processing.
[0076]
Next, the expansion coefficient generation means 22 will be described. The expansion coefficient generation means 22 receives a digital musical tone signal (waveform data), generates an expansion coefficient from the input waveform data, and outputs it to the time axis expansion means 20. It is.
[0077]
The process of the expansion coefficient generation unit 22 will be described in more detail with reference to FIG. 8. The expansion coefficient generation unit 22 performs a process obtained by detecting the envelope signal of the input waveform data (see FIG. 8A). ).
[0078]
A signal obtained by extracting only the portion of the envelope signal obtained above in this way from the predetermined level L and subtracting from the value 1 while limiting the extracted waveform signal so as not to exceed 1 is the expansion coefficient. (See FIG. 8 (b)).
[0079]
The limiter processing means 24 receives the digital musical tone signal (waveform data) output from the time axis extension means 20 and outputs the digital waveform signal limited so that the level of the input waveform data does not exceed a predetermined level L. It is.
[0080]
That is, the limiter processing unit 24 performs processing for suppressing the amplitude of a portion of the waveform data (see FIG. 8A) that is equal to or higher than the predetermined level L.
[0081]
The predetermined level L corresponds to the maximum amplitude value of the power supply voltage (+ B, −B) supplied to the power amplifier 102 (see FIG. 3) provided at the subsequent stage of the limiter processing means 24. The level of the tone signal output from the amplifier 102 is set so as to correspond to a level (clip level) that is limited.
[0082]
In the above configuration, the operation of the above-described effect device configured by the DSP 12 will be described with reference to the waveform diagram shown in FIG.
[0083]
That is, when the waveform data shown in FIG. 8A is input to the DSP 12, the expansion coefficient generation means 22 generates the expansion coefficient shown in FIG. 8B. As shown in FIGS. 8A and 8B, in the section T in which the level of the input waveform data is equal to or higher than the predetermined level L, the expansion coefficient becomes a value smaller than 1, and the input waveform data In the section excluding the section T where the level is equal to or higher than the predetermined level L, the expansion coefficient is 1.
[0084]
Then, in the time axis extension means 20, the waveform data shown in FIG. 8A is time-axis extended according to the extension coefficient shown in FIG. 8B and output (see FIG. 8C).
[0085]
The waveform data shown in FIG. 8C outputted from the time axis extension means 20 in this way is outputted with the limiter processing means 24 limiting the portion having an amplitude greater than or equal to the predetermined level L to the predetermined level L. (See FIG. 8D).
[0086]
The waveform data shown in FIG. 8D obtained as described above is output from the DSP 12 that implements the effect device according to the present invention, and the waveform data output from the DSP 12 is input to the digital / analog converter 14. It is converted into an analog tone signal by the digital / analog converter 14, output to the power amplifier 102, amplified by the power supply voltage (+ B, −B), and emitted to the space as a tone through the speaker 104. However, even though the amplitude of the musical sound signal is suppressed to the predetermined level L or less, the sound volume is such that the audible sound is generated at the predetermined level L or more by the time axis expansion process as described above. A feeling can be obtained.
[0087]
Next, another example of the functional configuration of the DSP 12 that realizes the effect device according to the present invention will be described with reference to FIGS. 9 to 10.
[0088]
That is, FIG. 9 is a block diagram showing another example of the functional configuration of the DSP 12 that realizes the effect device according to the present invention.
[0089]
In the configuration illustrated in FIG. 9, the same or corresponding configuration as the configuration illustrated in FIG. 4 is denoted by the same reference numeral as in FIG. 4, and detailed description thereof is omitted.
[0090]
The effect device realized by the DSP 12 shown in FIG. 9 includes the first multiplying means 30, the second multiplying means 32, the inverting means 34, and the adding means 36. This is different from the effect device realized by the DSP 12 shown in FIG.
[0091]
Here, in the effect device realized by the DSP 12 shown in FIG. 9, the expansion coefficient generation means 22 outputs the gate signal to the first multiplication means 30 and the inversion means 34 in addition to the generation of the expansion coefficient. Has been made.
[0092]
Here, the gate signal will be described with reference to the waveform diagram shown in FIG. 10. As for this gate signal, the envelope signal of the waveform data input by the expansion coefficient generating means 22 is detected (FIG. 10 (a)). The signal is a signal that rises to 1 when the level of the detected envelope signal exceeds a predetermined level L and falls to 0 when the level becomes equal to or lower than the predetermined level L (see FIG. 10C).
[0093]
That is, the gate signal is a signal that rises to 1 corresponding to a section T in which the detected envelope signal is equal to or higher than a predetermined level L.
[0094]
Here, the section T in which the level of the detected envelope signal is equal to or higher than the predetermined level L, that is, the section in which the gate signal rises, coincides with the section T whose expansion coefficient is smaller than 1 (FIG. 10B). ), A section in which the waveform data is read out with the time axis expanded by the reading means 206.
[0095]
The first multiplying unit 30 receives the gate signal, multiplies the gate signal by the waveform data output from the limiter processing unit 24, and a waveform obtained by extending the time axis from the waveform data output from the limiter processing unit 24. Only the data portion is separated and output to the adding means 36.
[0096]
On the other hand, the inverting means 34 receives the gate signal, obtains an inverted gate signal (see FIG. 10D) which is an output signal obtained by inverting the gate signal, and outputs it to the second multiplying means 32. Here, the inverted gate signal is a signal that rises to 1 corresponding to a period in which the time axis of the input waveform data is not expanded.
[0097]
The second multiplying unit 32 receives the inverted gate signal output from the inverting unit 34 and multiplies the inverted gate signal by the waveform data (input waveform data) supplied from the analog / digital converter 10. Only the portion of the waveform data that has not been time-axis-expanded is separated from the input waveform data and output to the adding means 36.
[0098]
The adding means 36 adds the waveform data respectively output from the first multiplying means 30 and the second multiplying means 32, and the added waveform data is output to the digital / analog converter 14 as an output signal of the DSP 12. become.
[0099]
In other words, in the adding means 36, only the waveform data that has been time-axis-expanded among the waveform data that is output through the time-axis expansion processing means 204 and the time-axis that has not been time-expanded in the input waveform data. Since the waveform data of the portion is added, in the example shown in FIG. 4, the waveform data after the time axis extension has a longer delay time than the waveform data before the time axis extension. In the example shown in FIG. 2, there is no delay time.
[0100]
In the above configuration, the operation of the effect device shown in FIG. 9 will be described in more detail with reference to the waveform diagram shown in FIG.
[0101]
That is, input waveform data (see FIG. 10A) as waveform data supplied from the analog / digital converter 10 is input to the expansion coefficient generation means 22 and an expansion coefficient is generated by the expansion coefficient generation means 22. (See FIG. 10B).
[0102]
On the other hand, when the envelope of the input waveform data (see FIG. 10A) exceeds a predetermined level L by the expansion coefficient generating means 22, a gate signal (see FIG. 10C) is output correspondingly. become.
[0103]
The gate signal output from the expansion coefficient generating means 22 is input to the inverting means 34, and the inverting means 34 inverts the gate signal to output an inverted gate signal (see FIG. 10D).
[0104]
Further, the waveform data (see FIG. 10A) is time-axis-expanded according to the expansion coefficient (see FIG. 10B) by the time-axis expansion means 20 and is output (waveform diagram similar to FIG. 8C). Therefore, the illustration is omitted).
[0105]
Next, of the amplitude of the waveform data output from the time axis extension means 20, the limiter processing means 24 suppresses the amplitude of the portion above the level L below the predetermined level L (similar to FIG. 8D). Since it is a waveform diagram, illustration is omitted).
[0106]
Then, the first multiplying unit 30 multiplies the waveform data output from the limiter processing unit 24 and the gate signal, and outputs the result to the adding unit 36.
[0107]
On the other hand, the second multiplying unit 32 multiplies the inverted gate signal output from the inverting unit 34 and the input waveform data, and outputs the result to the adding unit 36.
[0108]
The adding means 36 adds the waveform data output from the first multiplying means 30 and the second multiplying means 32, and outputs the added waveform data to the digital / analog converter 14 as an output signal of the DSP 12. .
[0109]
The waveform data output to the digital / analog converter 14 as described above is output from the DSP 12 that implements the effect device according to the present invention, and the waveform data output from the DSP 12 is input to the digital / analog converter 14. It is converted into an analog tone signal by the digital / analog converter 14, output to the power amplifier 102, amplified by the power supply voltage (+ B, −B), and emitted to the space as a tone through the speaker 104. However, even though the amplitude of the musical sound signal is suppressed to the predetermined level L or less, the sound volume is such that the audible sound is generated at the predetermined level L or more by the time axis expansion process as described above. A feeling can be obtained.
[0110]
When the effect device shown in FIG. 9 is used, a musical sound can be generated without causing a delay time as described above.
[0111]
【The invention's effect】
Since the present invention is configured as described above, when an amplifying device is used to amplify a musical tone signal and a musical tone is generated based on the amplified musical tone signal and emitted into space, the amplifying device Even when the maximum amplitude value of the musical sound signal is limited, it is possible to obtain an increase in volume feeling as if the musical sound signal was amplified beyond the limited maximum amplitude value. In an amplifying device such as a power amplifier determined by the power supply voltage, there is an excellent effect that it is possible to obtain a volume feeling that operates at a power supply voltage higher than the power supply voltage actually supplied.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating an example of a sound system including an amplification device and a speaker.
FIG. 2 is a waveform diagram showing a state in which the amplitude of a musical sound signal is limited by a power supply voltage supplied to a power amplifier.
FIG. 3 is a block diagram showing the overall structure of a sound system provided with an effect device according to the present invention.
FIG. 4 is a block diagram showing an example of a functional configuration of a DSP that realizes an effect device according to the present invention.
FIG. 5 is a block configuration diagram showing an overall configuration of a time axis extension means.
FIG. 6 is an explanatory diagram showing a configuration of a ring memory.
FIG. 7 is a waveform diagram for explaining processing of time axis extension by the time axis extension means.
FIG. 8 is a waveform diagram for explaining the operation when the effect device having the configuration shown in FIG. 4 is used.
FIG. 9 is a block diagram showing another example of a functional configuration of a DSP that realizes the effect device according to the present invention.
FIG. 10 is a waveform diagram for explaining the operation when the effect device having the configuration shown in FIG. 9 is used.
[Explanation of symbols]
10 Analog / digital converter (A / D)
12 Digital signal processor (DSP)
14 Digital / analog converter (D / A)
20 Time axis extension means
22 Expansion coefficient generating means
24 Limiter processing means
30 First multiplication means
32 Second multiplication means
34 Reversing means
36 Adding means
100 amplifiers
102 Power amplifier
104 Speaker
202 Temporary storage means
204 Time axis extension processing means
206 Reading means
208 Conversion means
210 Pitch conversion means

Claims (3)

In an effect device for adding an effect to an input musical sound signal,
An envelope signal of the input musical sound signal is detected, a portion of the envelope signal exceeding a predetermined level is extracted, and a portion corresponding to the extracted envelope portion of the input musical sound signal is extended in time axis Expansion coefficient generation means for generating an expansion coefficient to be
Effect device having a time axis expanding means for expanding the time axis tone signals the input based on該伸length coefficient. The effect device according to claim 1 , further comprising:
An effect device comprising a limiter processing means for limiting the level of a musical sound signal that has been time-axis extended by the time-axis extension means to a predetermined level or less. The effect device according to claim 2, further comprising:
The expansion coefficient generating means generates a gate signal indicating whether or not the input musical sound signal is equal to or higher than the predetermined level,
An effect device comprising selection output means for selecting and outputting either the musical tone signal output from the time axis expansion means or the input musical sound signal based on the gate signal .

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