JP4256573B2 - Pitch shift device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pitch shift apparatus that performs pitch shift by inputting string vibration signals of a plurality of strings.
[0002]
[Prior art]
Conventionally, there has been known a guitar amplifier device that picks up and amplifies vibration signals of each string from a musical instrument having a plurality of strings, such as a guitar or an electric guitar, and emits a musical sound from a speaker, and is connected to such a guitar amplifier device. As an effect device, there has been a pitch shift device including a pitch shift process for inputting a string vibration signal for each string and performing a pitch shift of each string vibration signal.
[0003]
When pitch shifting is performed by simulating an actual guitar, there is a tuning based on the string tension of each string and a so-called capo tost that shifts the pitch of multiple strings in semitones at once. There are two types.
[0004]
Since the conventional pitch shift device can independently set the pitch shift amount corresponding to each string, the total pitch shift amount due to the above two types of pitch shift factors is calculated for each string. By setting, it is possible to deal with any of the above two types of pitch shift factors or a combination of these two types of pitch shift factors.
[0005]
[Problems to be solved by the invention]
However, the above two types of pitch shift factors are independent from each other, and there are usually six in the case of a guitar, for example, by selecting one string and repeating the operation of setting the pitch shift amount corresponding to the tuning. After completing tuning for each string, this time, when trying to set capotast, it becomes necessary to set the pitch shift amount again while selecting one string at a time for each of the six strings, Even in the case of the operation of selecting a string and the pitch shift by capo tasto that sets the same pitch shift amount for all strings, the operation is troublesome in that it is necessary to set the pitch shift amount for each string. There is a problem.
[0006]
In view of the above circumstances, an object of the present invention is to provide a pitch shift device with improved operability when setting a pitch shift amount in a pitch shift process performed for each string vibration signal of a plurality of strings.
[0007]
[Means for Solving the Problems]
The first pitch shift device of the pitch shift device of the present invention that achieves the above object has an input terminal for inputting string vibration signals of a plurality of strings independently for each string, and input from this input terminal. A plurality of pitch shift means for performing a pitch shift for each string vibration signal with respect to a plurality of string vibration signals, and a pitch shift amount common to these plurality of pitch shift means, and a pitch shift amount in semitone units. A pitch shift amount setting means for setting the pitch shift means, and a tuning setting means capable of setting different pitch shift amounts for the plurality of pitch shift means, each of the plurality of pitch shift means, The input signal input to the pitch shift means is set by the pitch shift amount set by the pitch shift amount setting means and the tuning setting means. Characterized in that only the synthetic pitch shift amount between Tchishifuto amount is to pitch shift.
[0008]
According to the first pitch shift device of the present invention, the pitch shift amount setting means for setting a common pitch shift amount in semitone units to the plurality of pitch shift means corresponding to the capotast, and the plurality of pitches corresponding to tuning Each of the shift means has a tuning setting means capable of setting different pitch shift amounts, and each of the plurality of pitch shift means is set by both the pitch shift amount setting means and the tuning setting means. Since the pitch shift is performed by the total pitch shift amount, the user can set capotast and tuning separately independently, and the operability is improved.
[0009]
Here, in the first pitch shift device of the present invention, the pitch shift amount in semitone units, which is set by the pitch shift amount setting unit and is common to the plurality of pitch shift units, is used as the position of the guitar fret. It is preferable to provide display means for displaying.
[0010]
By doing so, it is possible to intuitively recognize the set amount of pitch shift by capo-tasto by visual recognition.
[0011]
A second pitch shift device of the pitch shift device according to the present invention includes an input terminal for independently inputting a string vibration signal of a plurality of strings for each string, and a plurality of strings input from the input terminal. A plurality of processing channels that perform signal processing including pitch shift processing for each string on the vibration signal, and the input of the string vibration signal of one of the strings from this input terminal, corresponding to that string Channel selection means for selecting a processing channel for setting the pitch shift amount of the pitch shift processing in the processing channel, channel display means for displaying the processing channel selected by the channel selection means, and channel selection means selected by the channel selection means Shift amount setting means for setting the pitch shift amount of the pitch shift processing in the processing channel, each of the plurality of processing channels is The string vibration signal inputted to the processing channel, characterized in that only the pitch shift amount set by the shift amount setting means performs a signal processing including a pitch shift processing for pitch shifting.
[0012]
In the second pitch shift device of the present invention, the processing channel for the string is selected simply by playing one of the strings. Therefore, when setting the pitch shift amount for the string vibration signal of the string, the processing channel is selected. It becomes easy and operability is improved.
[0013]
In addition, the second pitch shift device of the present invention has channel display means for displaying the processing channel selected by playing a string, so that it is possible to visually recognize which string has been selected.
[0014]
Moreover, this invention has the following aspects.
[0015]
(1) A plurality of input terminals for independently inputting a plurality of string vibration signals,
A plurality of pitch shift means for performing a pitch shift for each input signal with respect to the plurality of input signals;
A pitch shift amount setting means for setting a pitch shift amount common to the plurality of pitch shift means;
Control means for controlling the plurality of pitch shift means to shift the pitch by the pitch shift amount set by the setting means;
A pitch shift device.
[0016]
(2) The pitch shift device according to (1), wherein the pitch shift amount in the pitch shift amount setting means is a semitone unit.
[0017]
(3) Furthermore, a tuning setting means capable of setting a different pitch shift amount for each of the plurality of pitch shifting means is provided,
The control means controls the plurality of pitch shift means so as to shift the pitch by a composite pitch shift amount of the pitch shift amount set by the pitch shift amount setting means and the tuning setting means;
(1) The pitch shift device according to the above.
[0018]
(4) The tuning setting means stores a plurality of sets of pitch shift amounts for each of the plurality of pitch shift means, selects a desired one from the plurality of sets, and performs a pitch shift for each pitch shift means. Set the amount,
(2) The pitch shift device according to the above.
[0019]
(5) Display means for displaying the pitch shift amount set by the pitch shift amount setting means, wherein the pitch shift amount is displayed as the position of the guitar fret;
The pitch shift device according to any one of (1) to (4), further including:
[0020]
(6) A plurality of input terminals for independently inputting a plurality of musical sound signals,
A plurality of processing channels for performing signal processing for each musical tone signal input to the plurality of input terminals;
Parameter setting means for selecting at least one processing channel from the plurality of processing channels and setting a parameter for signal processing;
Channel selection means for controlling the processing channel corresponding to the input terminal to be selected as a setting target channel in the parameter setting means when a musical sound signal is input to one input terminal of the plurality of input terminals;
A channel selection device consisting of
[0021]
(7) It further includes channel display means for displaying the processing channel selected as the setting target channel in the parameter setting means.
(6) The channel selection device according to (6).
[0022]
(8) Shift amount setting means for selecting at least one processing channel from processing channels in which each of the plurality of pitch shift means is interposed and setting the pitch shift amount;
Channel selection means for controlling to select the processing channel corresponding to the input terminal as a setting target channel in the shift amount setting means when a musical sound signal is input to one input terminal of the plurality of input terminals;
Channel display means for displaying a processing channel selected as a setting target channel in the shift amount setting means;
The pitch shift device according to (3), further comprising:
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
[0024]
FIG. 1 is a block diagram showing a signal processing configuration of a guitar amplifier apparatus in which the present invention is implemented.
[0025]
The guitar amplifier apparatus 100 includes two input terminals, an input terminal 101 and an input terminal 102, and the input terminal 101 is a terminal for inputting a string vibration signal as an electric signal, and includes a plurality of input terminals. This is an input terminal that can be inputted separately for each string without mixing the string vibration signals of the strings (usually 6 strings in the case of a guitar).
[0026]
The input amplifier 111 is an amplifier that amplifies the input signal input from the input terminal 101, and the A / D converter 121 is an analog-digital converter that converts the analog input signal from the input amplifier 111 into a digital signal. is there. The digitally converted input signal is input to a DSP (digital signal processing means) 130.
[0027]
Here, in order to simplify the drawing, only one input amplifier 111 and one A / D converter 121 are shown, but each of them corresponds to each of the string vibration signals of a plurality of strings input from the input terminal 101. A plurality of input amplifiers 111 and a plurality of A / D converters 121 are provided. Alternatively, instead of providing a plurality of A / D converters 121, one A / D converter may be used in a time division manner.
[0028]
The input terminal 102 is an input terminal for inputting a signal from a pickup (a plurality (6 strings) of string vibration signals are output from one output terminal) generally provided in an electric guitar. Amplified by the amplifier 112, converted into a digital signal by the A / D converter 122, and input to the DSP 130.
[0029]
Here, one A / D converter may be used as the A / D converter 121 and the A / D converter 122 in time division.
[0030]
The DSP 130 is digital signal processing means for performing guitar simulation processing, amplifier simulation processing, and effect addition processing. Details will be described later.
[0031]
The D / A converter 141 is a digital-analog converter that converts the processed digital signal output from the DSP 130 into an analog signal, the power amplifier 151 is an amplifier that drives a speaker, and the tweeter 161 is a high-frequency range. The speaker to be reproduced, the woofer 162 is a speaker to reproduce the low frequency range, and the crossover network 163 is means for dividing the input audio signal into a high frequency component and a low frequency component.
[0032]
Further, the CPU 170 is a unit that detects an operation state of the operation unit 181 provided in the operation panel 180, controls the DSP 130, and controls the display unit 182 to display the state of the operation unit.
[0033]
Next, signal processing in the DSP will be described.
[0034]
The DSP 130 includes a guitar simulation processing unit 131, an amplifier simulation processing unit 132, and an effect addition processing unit 133.
[0035]
The guitar simulation processing unit 131 is a processing unit that simulates and adds the shape of the guitar body and the acoustic characteristics of the pickup, and corresponds to an embodiment of the pitch shift device of the present invention.
[0036]
More specifically, in the guitar simulation processing unit 131, the guitar simulation processing unit 131 is provided by a pickup simulation process for simulating a frequency characteristic provided in a pickup that converts a string vibration of a guitar into an electric signal, and a physical structure of the guitar body. And physical structure simulation processing for simulating frequency characteristics.
[0037]
Furthermore, the guitar simulation processing unit 131 also includes a plurality of pitch shift means for shifting the pitch for each input signal, which is an embodiment of the present invention. Details will be described later.
[0038]
The amplifier simulation processing unit 133 is a processing unit that simulates analog guitar amplifier characteristics. Of the amplifier simulation processing unit 132, the preamplifier simulation processing unit 1321 is a processing unit that simulates the characteristics of the preamplifier, and the power amplifier simulation processing unit 1322 is a processing unit that simulates the characteristics of the power amplifier.
[0039]
The effect addition processing unit 133 is a processing unit that adds effect processing to the input signal. The aspect of the effect to be added, the position where the effect is added, and the like can be arbitrarily set. In FIG. 1, a first effect processing unit 1331 disposed in the preceding stage of the amplifier simulation processing unit 132, a second effect processing unit 1332 disposed in the middle of the amplifier simulation processing unit 132, and an amplifier simulation processing unit 132 are illustrated. A third effect processing unit 1333 arranged in the subsequent stage is shown. These first to third effect processing units 1331, 1332, and 1333 are not always necessary, and the position where the effect is added can be set to any position among them. It shows that there is.
[0040]
FIG. 2 is a block diagram showing the configuration of the guitar simulation processing unit shown by one block in FIG.
[0041]
The guitar simulation processing unit 131 includes a pickup unit 1311 that performs the above-described pickup simulation process, a pitch shift unit 1312 that converts the pitch of the input musical sound signal, a body unit 1313 that performs the above-described physical structure simulation process, The input signal detection unit 1314 detects whether or not there is an input signal from the input terminal 101.
[0042]
The pickup unit 1311, the pitch shift unit 1312, and the body 1313 have a processing channel corresponding to each string so that the string vibration signal of each string input from the input terminal 101 can be processed independently for each string. It is composed.
[0043]
Here, the pickup simulating process in the pickup unit 1311 and the physical structure simulating process in the body 1313 are conventionally known and will not be described in detail. The pitch shift processing in the pitch shift unit 1312 is the core of the present invention, and details will be described later. The input signal detection unit 1314 is provided with a flag for each string. The initial value of each flag is 0. The level of the input signal is sequentially detected for each string, and a predetermined threshold is set. When there is an input signal exceeding the level, 1 is set in the flag corresponding to the string.
[0044]
FIG. 3 is a circuit configuration diagram showing one channel of the pitch shift unit 1312 of the guitar simulation processing unit 131 shown in FIG.
[0045]
A signal input to the pitch shift unit 1311 is configured to be output via three signal transmission paths 13111, 13112, and 13113.
[0046]
Of these three signal transmission paths 13111, 13112, and 13113, the signal transmission path 13111 is a signal transmission path when no pitch shift is performed, and is given a level A and output via an adder. Level A is 0 when pitch shifting is performed.
[0047]
The signal transmission path 13112 is a path to which the level shift B is given by the pitch shift calculation B performed by the pitch shift information B composed of the combination of the tuning information B and the capotast information.
[0048]
Similarly, the signal transmission path 13113 is a path to which the level C is given by performing the pitch shift calculation C by the pitch shift information C composed of the combination of the tuning information C and the capotast information.
[0049]
Tuning information and capotast information will be described later.
[0050]
When performing the pitch shift calculation, the level A is 0, and either the pitch shift calculation B or the pitch shift calculation C is used. The reason why there are two paths for performing the pitch shift operation is to use it when simulating a 12-string guitar. When simulating a 12-string guitar, a string signal for 12 strings is obtained by obtaining 2 strings from the original sound and a pitch-shifted string signal for each string. Since the signal may be shifted, the original signal can also be pitch-shifted.
[0051]
FIG. 4 is a diagram showing an operation panel indicated by blocks in FIG.
[0052]
Here, a type (TYPE) button 1811 that is pressed when setting the type of guitar to be simulated, a plurality of LEDs 1812 that are lit when the type button 1811 is pressed, and a pickup selection are made. Pickup button 1813 to be pressed by the user, a plurality of LEDs 1814 that turn on when the pickup button 1813 is pressed, a tuning button 1815 to be pressed when performing tuning processing, and the tuning button is pressed A plurality of LEDs 1816, one of which is lit, a capostat (CAPO) button 1817 that is pressed when performing capotast processing, an LED 1818 that lights when the capotast button 1817 is pressed, and the edit mode is set. An edit button 1819 that is pressed when the power is turned on, two value buttons 1820 and 1821 that are pressed when the set value is lowered and raised, and a power button 1822 for turning on / off the power of the guitar amplifier device, and a three-digit numerical value are displayed. A numerical display unit 1831 for performing the display and a screen display unit 1832 for displaying a screen corresponding to the situation are shown.
[0053]
Hereinafter, each process will be described.
[0054]
When performing the capotast process, when the “capo toast button” on the operation panel of FIG. 4 is operated, the LED 1818 is turned on and the capo last (pitch shift operation mode) is turned on.
[0055]
The pitch shift amount at that time is displayed numerically on the numerical value display portion 1831 as the number of frets (+12 to −12).
[0056]
If it is desired to change the pitch shift amount, the edit button 1819 is operated. Then, since the edit mode is entered, the value buttons 1820 and 1821 are operated to set the shift amount (+12 to −12). The display value of the numerical value display portion 1831 changes according to the operation.
[0057]
Here, the capotast process refers to a process of performing a pitch shift in units of semitones in common for all strings, and the pitch shift amount expressed in units of semitones is referred to as a fret number. In the case of an actual guitar, a negative pitch shift is not performed by capo tasto, but here a process of performing a semi-tone pitch shift common to all strings is also referred to as a capo tasto process. .
[0058]
FIG. 5 is a diagram illustrating another example of the fret number display in the capo toast process.
[0059]
In the above description with reference to FIG. 4, the number of frets is displayed by turning on the LED 1818 indicating that the capotast is set and the numerical value displayed on the numerical value display unit 1831. The number of frets may be displayed by displaying a design as shown in FIG. FIG. 5 is a design simulating the shape of a part of an actual guitar. In this case, a negative fret number is not set. Further, the display of FIG. 5 and the numerical display of the number of frets on the numerical display unit 1831 may be used in combination.
[0060]
When tuning setting processing is performed, a tuning button 1815 on the operation panel in FIG. 4 is operated. When the tuning button 1815 is operated, of the plurality of LEDs 1816,
・ NORMAL
・ 12STRING
・ OPEN TYPE
・ NASHVILLE
・ USER
One of the LEDs is lit and the main tuning type is selected.
[0061]
The tuning setting process is equivalent to adjusting the tension of each string, and a different pitch shift amount can be set for each of a plurality of strings.
[0062]
Each type further includes a plurality of sub-tuning types, and these sub-tuning types are displayed numerically on the numerical value display portion 1831.
[0063]
To change the sub-tuning type, the edit button 1819 is operated. Then, since the edit mode is entered, the value buttons 1820 and 1821 are operated to set the sub-tuning type. The display value of the numerical value display portion 1831 changes according to the operation.
[0064]
Here, “NORMAL” is a tuning type that outputs a string vibration signal without shifting the pitch, and “12STRING” is a tuning type that reproduces the tuning of a 12-string guitar. In this "12 STRING", as sub-tuning,
(1) The 1st and 2nd strings output a signal that is not pitch shifted and a signal that is slightly pitch shifted, and the 3rd and 6th strings output a signal that is not pitch shifted and a signal that is pitch shifted one octave higher.
[0065]
(2) All the 1st to 6th strings output a signal that is not pitch-shifted and a signal that is pitch-shifted one octave higher.
There are two sub-tuning types.
[0066]
In addition, “OPEN TYPE” is a tuning type that reproduces open tuning, and this “OPEN TYPE” includes sub-tuning,
(1) OPEN G TUNING
Signals tuned to D, G, D, G, B, and D are output in order from the 6th string to the 1st string.
[0067]
(2) OPEN D TUNING
Signals tuned to D, A, D, F #, A, and D are output in order from the 6th string to the 1st string.
There are two sub-tuning types.
[0068]
Furthermore, “NASHVILLE” is a tuning type that reproduces Nashville tuning. In this “NASHVILLE”, the 1st and 2nd strings output signals that are not pitch-shifted, and the 3rd to 6th strings output signals that are pitch-shifted one octave higher. This “NASHVILLE” has no sub-tuning.
[0069]
Furthermore, “USER” is a tuning type that reproduces tuning arbitrarily set by the user.
[0070]
When setting the type of guitar to be simulated, the type button 1811 on the operation panel in FIG. 4 is operated. When this type button 1811 is operated, of the plurality of LEDs 1812,
・ ST
・ LP
・ TEL
・ HOLLOW
・ ACOUSTIC
One of the LEDs lights up and the guitar type is selected.
[0071]
Each guitar type further includes a plurality of sub guitar types, and these sub guitar types are displayed numerically on a numerical value display portion 1831. In order to change the sub guitar type, an edit button 1819 is operated. Then, the edit mode is entered, and the value buttons 1820 and 1821 are operated to set the sub guitar type. The display value of the numerical value display portion 1831 changes according to the operation.
[0072]
Here, “ST” is the sound of a solid body guitar with three single coil pickups, “LP” is the sound of a solid body guitar with two double coil pickups, “ “TEL” is the sound of a solid body guitar with two single coil pickups, “HOLLOW” is the sound of a hollow body electric guitar such as a semi-acoustic guitar or a full acoustic guitar, “ “ACOUSTIC” represents simulating the sound of a guitar with a hollow body such as a classic guitar or a folk guitar and obtaining a musical sound with a microphone or a piezo pickup.
[0073]
When selecting a pickup, the pickup button 1813 on the operation panel in FIG. 4 is operated. When this pickup button 1813 is operated, of the plurality of LEDs 1814,
・ F
・ C
・ R
・ PIEZO
・ MIC
A pickup to be simulated when any of the LEDs is lit is selected.
[0074]
However, selectable pickups or microphones are limited according to the previously selected guitar type.
[0075]
Here, “F” is the front pickup, the pickup arranged at the neck side position, “R” is the rear pickup, the pickup arranged at the bridge side position, and “C” is Pickup arranged at the middle position of front pickup and rear pickup, “PIEZO” is a pickup that detects string vibration signal with piezoelectric element arranged on the guitar, “MIC” is a string away from the guitar body It represents a microphone that detects vibration signals.
[0076]
FIG. 6 is a flowchart showing the tuning operation interrupt process. This tuning operation interrupt process is an interrupt process executed at a predetermined interrupt cycle.
[0077]
Here, it is first determined whether or not the main tuning type has been changed by operating the tuning button 1815 or the sub tuning type has been changed in the edit mode (step a1). If it is neither of them, do nothing and exit this processing flow.
[0078]
In step a2, it is determined whether or not the tuning button 1815 has been operated. When the tuning button 1815 is operated, the main tuning type is changed to the next type, and at the same time, the sub tuning type set last time of the changed main tuning type is set (step a3).
[0079]
In step a4, it is determined whether or not the edit mode is entered by operating the edit button 1819 and the sub-tuning type is changed by operating the value buttons 1820 and 1821. If the sub-tuning type is changed, the sub-tuning type is changed to the newly selected sub-tuning type (step a5).
[0080]
In step a6, tuning information B, C and levels A, B, C corresponding to the changed main tuning type and sub tuning type are set in the pitch shift means (see FIG. 3).
[0081]
In step a7, it is determined whether or not the capo last mode is ON, and in the case of the capo last mode, it is determined whether or not pitch shift is performed by a new tuning type and the capo last, and the levels A, B, and C are appropriately corrected (step S7). a8).
[0082]
For example, when it is set not to turn off the capo tasto or pitch shift, it is set as follows according to each tuning type.
[0083]
In the case of “NORMAL”, level A is set to 1 and levels B and C are set to 0 for each string. Any tuning information B, C may be used.
[0084]
In the case of “OPEN TYPE”, “NASHVILLE”, and “USER”, the level C is set to 0 for each string. Any tuning information C may be used. Further, the value of the string to be pitch-shifted is set in tuning information B, level B is set to 1, and level A is set to 0. For strings not pitch shifted, level B is set to 0 and level A is set to 1. Any tuning information B may be used for strings that are not pitch-shifted.
[0085]
In the case of “12 STRING”, levels A and B are set to 1 for each string, level C is set to 0, the shift amount of each string is set in tuning information B, and the pitch information is not shifted to tuning information C 0 is set.
[0086]
The signal transmission path 13111 for bypassing the pitch shift calculation is provided because the sound quality is better when the calculation is bypassed when the pitch shift is not performed.
[0087]
FIG. 7 is a flowchart showing the capo last interrupt process. This capo last interrupt process is a CPU interrupt process periodically generated when the capo last button 1817 (see FIG. 4) is operated.
[0088]
Here, first, it is determined whether or not the shift amount has been changed by operating the edit button 1819 and further operating the value buttons 1820 and 1821 (step b1). When the shift amount is changed, the changed shift amount is set as the capotast information in the pitch shift means of each string (step b2). When the pitch shift is performed by those that have not been pitch-shifted by this setting, the signal transmission path 13111 (see FIG. 3) that does not perform the pitch shift is cut off to block the signal transmission path 13112 or the signal transmission path. Since the pitch shift calculation process may be performed at 13113 or the signal transmission path 13111 may be passed through, the levels A, B, and C are corrected according to the state (step b3).
[0089]
Here, the interruption for executing the flow of FIG. 7 is generated at a cycle such that the operation of the value buttons 1820 and 1821 and the change of the setting process of the capo last are not unnaturally felt in the setting of the capo last.
[0090]
FIG. 8 is a flowchart showing processing in the edit mode of user tuning. This process is a timer interrupt process. In this process, a flag provided for each string of the input signal detection unit 1314 shown in FIG. 2 is monitored, and a parameter setting target channel is selected. This is a process of changing the parameter parameter (pitch shift amount) of the channel.
[0091]
The timer interruption period is such a period that the operation of the value buttons 1820 and 1821 and the change of the parameter as the operation result do not feel unnatural.
[0092]
Further, the condition for permitting the interrupt processing in FIG. 8 is that “USER” is selected by operating the tuning button 1815 and the edit button 1819 is operated to enter the edit mode. This condition is satisfied. In this case, the interruption of the process in the edit mode of the user tuning shown in FIG. 8 is permitted.
[0093]
In the process of FIG. 8, first, each flag of the input signal detection unit 1314 of FIG. 2 is scanned (step c1). As a result of the scan, there is a channel whose input signal has changed from “none” to “present”. It is determined whether or not there is (step c2). If there is a changed channel, the process proceeds to the next step c3, and if there is no changed channel, the process proceeds to step c5 described later.
[0094]
In step c3, a channel that has changed from “none” to “present” is detected, and that channel is set as a channel for editing the parameter (shift amount). Note that when two or more channels having the input signal changed from “none” to “present” are detected at the same time, a string channel closer to the first string side is set as the editing channel. In step c4, the channel set in step c3 is displayed numerically on the numerical value display portion 1831.
[0095]
In step c5, it is determined whether or not the value buttons 1820 and 1821 are operated to change the shift amount. If it is determined that the shift amount has not changed, the processing in the edit mode for user tuning is terminated. On the other hand, if it is determined that the shift amount has changed, the process proceeds to the next step c6.
[0096]
In step c6, the shift amount set by the value buttons 1820 and 1821 is detected, and the detected shift amount is set as a new shift amount in the current editing channel.
[0097]
Further, in step c7, the new shift amount is displayed as a numerical value on the numerical value display unit 1831, and the processing in the edit mode of this user tuning is terminated.
[0098]
【The invention's effect】
As described above, according to the present invention, when setting the pitch shift amount of each of the string vibration signals of a plurality of strings, the operability is improved and a user-friendly device is realized.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a signal processing configuration of a guitar amplifier apparatus in which the present invention is implemented.
FIG. 2 is a block diagram showing a configuration of a guitar simulation processing unit shown by one block in FIG. 1;
3 is a circuit configuration diagram showing one channel of a pitch shift unit of the guitar simulation processing unit shown in FIG. 2;
4 is a diagram showing an operation panel indicated by blocks in FIG. 1;
FIG. 5 is a diagram showing another example of fret number display in the capo toast process.
FIG. 6 is a flowchart showing a tuning operation interrupt process.
FIG. 7 is a flowchart showing a capo last interrupt process;
FIG. 8 is a flowchart showing processing in edit mode of user tuning.
[Explanation of symbols]
100 Guitar amp equipment
101,102 input terminals
111,112 input amplifier
121,122 A / D converter
130 DSP
131 Guitar simulation processor
132 Amplifier simulation processing section
133 Effect addition processing part
141 D / A converter
151 Power amplifier
161 Tweeter
162 Woofer
163 Crossover network
170 CPU
180 Operation panel
181 Controller means
182 Display means
1311 Pickup section
1312 Pitch shift part
1313 body
1314 Input signal detector
1321 Preamplifier simulation processing unit
1322 Power amplifier simulation processing unit
1331 First effect processing unit
1332 Second effect processing unit
1333 Third effect processing unit
1811 Type button
1812 LED
1813 PICKUP button
1814 LED
1815 Tuning button
1816 LED
1817 Capotasto (CAPO) button
1818 LED
1819 Edit button
1820, 1821 Value button
1822 Power button
1831 Numerical display
1832 Screen display
13111, 13112, 131113 Signal transmission path

Claims (2)

An input terminal for inputting string vibration signals of a plurality of strings independently for each string;
A plurality of processing channels for performing signal processing including pitch shift processing for each string on a plurality of string vibration signals input from the input terminal;
The input of the string vibration signal from the input terminal is detected, and one processing channel is selected from the plurality of processing channels according to a predetermined priority order among the strings from which the string vibration signal is input. Processing channel selection means to perform,
A first operator commonly used for each string, which specifies a pitch shift amount in the processing channel selected by the processing channel selection means by operation;
Pitch shift amount setting means for setting the pitch shift amount designated by the first operator as the pitch shift amount of the pitch shift processing in the processing channel selected by the processing channel selection means,
Signal processing including pitch shift processing for performing a pitch shift by the pitch shift amount set by the shift amount setting means is performed on the string vibration signal input to the processing channel selected by the processing channel selection means. A pitch shift device characterized by the above. A second operator for specifying a second pitch shift amount common to the plurality of strings by operation;
The shift amount setting means sets each pitch set for each processing channel by the first operator as a pitch shift amount for pitch shift processing in a plurality of processing channels corresponding to each of the plurality of strings. 2. The pitch shift apparatus according to claim 1, wherein a pitch shift amount obtained by adding the second pitch shift amount set by the second operator to the shift amount is set.

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