Tuning device

Abstract

The present invention provides a tuning device that notifies a tuning state by sound based on an obtained audio signal. The tuning device of the present invention includes a signal obtaining mechanism that obtains the audio signal, a comparing mechanism that compares a frequency of the audio signal with a reference frequency corresponding to the audio signal, and a generating mechanism that generates a first sound signal in a case where a state in which the frequency of the audio signal is lower than the reference frequency is present, and generates a second sound signal different from the first sound signal in a case where a state in which the frequency of the audio signal is higher than the reference frequency is present.

Description

TECHNICAL FIELD

[0001] The present application relates to a technology of tuning a musical instrument. BACKGROUND

[0002] In the field of electronic musical instruments, a device that performs tuning (tuning) based on a musical sound signal output from a musical instrument is known. For example, Patent Literature 1 and Patent Literature 2 disclose a device that visually displays how much the frequency of a sound output from an object musical instrument deviates from the frequency of a reference sound.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Laid-Open No. 2009-86443

[0006] Patent Literature 2: Japanese Patent Laid-Open No. 2004-53779 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] According to the inventions described in Patent Literature 1 and Patent Literature 2, it is possible to intuitively grasp the tuning state of an electronic musical instrument. On the other hand, in the inventions, since the state is notified by a light emitting element or a liquid crystal screen, the operator needs to constantly watch the device in the tuning work to grasp the high-low relationship between the sound output from the musical instrument and the reference sound. That is, there is a problem in terms of improving the usability.

[0009] The present application was made in view of the problem, and aims to provide a technology for intuitively notifying the deviation of the high-low of a sound output from a musical instrument from the high-low of a reference sound.

[0010] MEANS OF SOLVING THE PROBLEM

[0011] The tuning device of the present application includes:

[0012] a signal obtaining mechanism that obtains an audio signal; a comparing mechanism that compares the frequency of the audio signal with a reference frequency corresponding to the audio signal; and a generating mechanism that generates a first sound signal in a case where the frequency of the audio signal is lower than the reference frequency, and generates a second sound signal different from the first sound signal in a case where the frequency of the audio signal is higher than the reference frequency.

[0013] The tuning device of the present application determines the high-low relationship between the frequency of an audio signal (for example, a musical sound signal obtained from an electronic musical instrument) and a reference frequency corresponding to the audio signal, and makes the generated sound signal different based on the high-low relationship.

[0014] According to the configuration, the operator can be informed of the high-low relationship of the frequency of the audio signal by sound alone, so the operability can be improved without the need for a gaze device.

[0015] Further, in the present specification, the frequency of the audio signal refers to a frequency obtained by evaluating the audio signal by an arbitrary evaluation method, corresponding to the sound (e.g., representative sound) included in the audio signal. Thus, the audio signal need not necessarily include only a single frequency component. Further, the first sound signal and the second sound signal are sound signals generated for each first period, and the first period is a value related to the difference between the frequency of the audio signal and the reference frequency.

[0016] According to the configuration, the operator can be informed of how much the frequency is apart (how much the deviation is present) in addition to the high-low relationship of the frequency.

[0017] Further, in a case where the signal obtaining mechanism detects the rise of the audio signal, the generating mechanism resets the count of the first period and immediately starts the generation of the first sound signal or the second sound signal.

[0018] For example, in a case where the audio signal is a musical tone signal output from an electronic musical instrument, in a case where the operator performs a key stroke or a pick-up, by resetting the first period and immediately generating the sound signal, the current situation can be more quickly conveyed to the operator. The timing of the rise of the audio signal can be, for example, a timing at which the level of the audio signal is higher than a prescribed value.

[0019] Further, the first sound signal and the second sound signal are a combination of two or more sounds having different intervals, and the combination of the first sound signal and the second sound signal is reversed with respect to the intervals.

[0020] For example, by setting the combination of the sounds having different intervals like "high→low" "low→high", it is possible to intuitively inform whether the frequency of the audio signal is in a state lower than the reference frequency or in a state higher than the reference frequency.

[0021] Further, the two or more sounds having different intervals need not necessarily be monophonic, and can be smoothly changed.

[0022] For example, the first sound signal and the second sound signal can be a sweep tone in which two or more sounds having different intervals are continuously connected, and preferably can be an exponential chirp signal. By making the intervals change according to an exponential function, it is possible to more easily inform the high-low direction.

[0023] Further, in a case where the frequency of the audio signal is substantially the same as the reference frequency, the generation mechanism generates a third sound signal different from the first and second sound signals.

[0024] According to the configuration, an operator can be informed of the fact that the pitch has reached a desired state by sound.

[0025] Further, the tuning device further includes an effect imparting mechanism that imparts a prescribed effect to the audio signal, and the generation mechanism mixes the audio signal to which the effect has been imparted with the first or second sound signal.

[0026] By mixing the sound signal that informs of the tuning state with the audio signal to which the prescribed effect has been imparted, the operator can grasp the sound that is the tuning target.

[0027] Further, the tuning device of another embodiment of the present application includes:

[0028] a signal obtaining mechanism that obtains an audio signal, a comparison mechanism that compares the frequency of the audio signal with a reference frequency corresponding to the audio signal, and a generation mechanism that generates a sound signal for each first period in a case where the frequency of the audio signal is slightly different from the reference frequency, and the first period is a value related to the difference between the frequency of the audio signal and the reference frequency.

[0029] As described above, the present application can also be specified as a device that informs of the magnitude of the deviation of the frequency by sound.

[0030] Further, in a case where the frequency of the audio signal is substantially the same as the reference frequency, the generation mechanism generates a third sound signal different from the first and second sound signals.

[0031] Further, the present application can be specified as a tuning device including at least a part of the mechanisms. Further, it can also be specified as a method performed by the tuning device. Further, it can also be specified as a program for executing the method. The processes or mechanisms can be freely combined and implemented as long as there is no technical contradiction. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a block diagram of an electronic musical instrument system of an embodiment.

[0033] Figure 2 is an appearance diagram of a transmitter.

[0034] Figure 3 is a hardware configuration diagram of a transmitter.

[0035] Figure 4 is a hardware configuration diagram of a sound output device.

[0036] Figure 5 is a functional configuration diagram of a digital signal processor (DSP) included in the sound output apparatus of the first embodiment.

[0037] Figure 6 is a functional configuration diagram of the sound generation section.

[0038] Figure 7 is a flowchart of the processing performed by the sound output apparatus.

[0039] Figure 8 is an example of a table used to specify intervals from frequencies.

[0040] Figure 9 is a diagram explaining the relationship between the deviation amplitude and the pronunciation interval.

[0041] Figure 10 is a diagram explaining the relationship between the deviation amplitude and the pronunciation interval.

[0042] Figure 11 is a functional configuration diagram of a DSP included in the sound output apparatus of the third embodiment.

[0043] [Explanation of Symbols]

[0044] 10: transmitter

[0045] 20: sound output apparatus

[0046] 30: electric guitar

[0047] 101: CPU

[0048] 102, 203: ROM

[0049] 103, 204: RAM

[0050] 104: connection section

[0051] 105: wireless transmission section

[0052] 201: wireless reception section

[0053] 202: DSP

[0054] 205: amplifier

[0055] 206: loudspeaker DETAILED DESCRIPTION

[0056] The electronic musical instrument system of the present embodiment is configured including a transmitter 10 that wirelessly transmits a sound signal output by an electronic musical instrument, and a sound output apparatus 20 that receives the wirelessly transmitted sound signal, amplifies it, and outputs it.

[0057] Figure 1 Fig. 1 is a diagram showing the overall configuration of an electronic musical instrument system according to the present embodiment.

[0058] The transmitter 10 is a portable device that is connected to a portable electronic musical instrument (an electric guitar 30 in the present embodiment) including a performance operator, and transmits a sound signal output from the electronic musical instrument by wireless. Figure 2 Fig. 2 is a diagram showing the appearance of the transmitter 10. As shown in the figure, the transmitter 10 can be connected to the electronic musical instrument by a headphone plug including a three-pole connection terminal. After the transmitter 10 is inserted into a sound output terminal (headphone jack) included in the electronic musical instrument, a physical switch (power switch) is turned on, a sound signal is obtained from the electronic musical instrument, and transmission is performed by wireless.

[0059] The electric guitar 30 includes a plurality of strings, and a pickup that detects the vibration of the strings, and converts the vibration of the strings into an electric signal (sound signal) and outputs it. The electric guitar 30 outputs the sound signal to the transmitter 10 via the headphone jack. The output sound signal is modulated and transmitted by the transmitter 10, and is output by being received and demodulated by the headphone device sound output device 20.

[0060] Reference Signs List Figure 3 The hardware configuration of the transmitter 10 will be described.

[0061] The transmitter 10 includes a central processing unit (CPU) 101, a read only memory (ROM) 102, a random access memory (RAM) 103, a connection section 104, and a wireless transmission section 105. These are driven by power supplied from a rechargeable battery (not shown).

[0062] The CPU 101 is an arithmetic device that is responsible for the control performed by the transmitter 10.

[0063] The ROM 102 is a non-volatile memory that can be overwritten. The ROM 102 stores a control program executed in the CPU 101, or data used by the control program (for example, a frequency used for transmission of a musical tone signal, etc.).

[0064] The RAM 103 is a memory that expands the control program executed by the CPU 101, or the data used by the control program. By importing the program stored in the ROM 102 into the RAM 103, and executing it by the CPU 101, the processes described below are performed.

[0065] Further, Figure 3The illustrated structure is an example, and all or a part of the illustrated functions can be executed using a dedicated circuit. In addition, the storage or execution of the program can be performed by a combination of a main storage device and an auxiliary storage device other than those illustrated.

[0066] The connection portion 104 is an interface (for example, a two-pole or three-pole earphone plug) for physically connecting the transmitter 10 to the electric guitar 30. The connection portion 104 includes Figure 2 The illustrated connection terminal is capable of obtaining a sound signal from the electric guitar 30 in the case of being connected to the electric guitar 30.

[0067] In addition, a power switch is disposed in the vicinity of the connection terminal included in the connection portion 104, and the power switch is pressed by plugging in a plug.

[0068] The wireless transmission portion 105 is a wireless communication interface that transmits a signal wirelessly. In the present embodiment, the wireless transmission portion 105 transmits a sound signal output from the electric guitar 30 to the sound output device 20.

[0069] Each of the above-described mechanisms is connected by a bus in a communicable manner.

[0070] Next, the hardware structure of the sound output device 20 will be described with reference to Figure 4 The hardware structure of the sound output device 20 will be described.

[0071] The sound output device 20 amplifies and outputs a sound signal transmitted wirelessly from the transmitter 10, and is a device of an earphone type. The sound output device 20 has the following functions: (1) a function of performing a prescribed process (imparting an acoustic effect, etc.) on a received sound signal, and amplifying and outputting the same; and (2) a function of tuning an electronic musical instrument based on a received sound signal.

[0072] The two functions can be switched by an operator.

[0073] The sound output device 20 includes a wireless reception portion 201, a DSP 202, a ROM 203, a RAM 204, an amplifier 205, and a loudspeaker 206. These mechanisms are driven by power supplied from a rechargeable battery.

[0074] The wireless reception portion 201 is a wireless communication interface that receives a signal transmitted by the transmitter 10. In the present embodiment, the wireless reception portion 201 is wirelessly connected to the wireless transmission portion 105 included in the transmitter 10, and receives a sound signal output from the electric guitar 30.

[0075] The DSP 202 is a microprocessor specialized in digital signal processing. In the present embodiment, the DSP 202 performs processing specialized in processing of sound signals. Specifically, a signal obtained via the wireless reception section 201 is decoded to obtain a sound signal, and effects are imparted as necessary or the like. The sound signal output from the DSP 202 is converted to an analog signal, amplified by the amplifier 205, and output from the loudspeaker 206.

[0076] Further, the DSP 202 can perform the sound tuning processing described in the present specification. The specific processing is described below.

[0077] The ROM 203 is a non-volatile memory that can be overwritten. The ROM 203 stores a control program executed in the DSP 202, or data used by the control program. As the data stored in the ROM 203, for example, a frequency or a channel list at the time of wireless communication between the sound output device 20 and the transmitter 10, or the like can be cited. In addition, information required for sound tuning (for example, information related to a frequency that becomes a reference (described below with reference to FIG. 6)) or the like can be cited. Figure 7 The processing described below is performed by the DSP 202.

[0078] The RAM 204 is a memory that expands a control program executed by the DSP 202, or data used by the control program. By importing the program stored in the ROM 203 into the RAM 204, and executing by the DSP 202, the processing described below is performed.

[0079] In addition, Figure 4 The structure illustrated is an example, and all or a part of the functions illustrated can be executed using a specially designed circuit. In addition, the storage or execution of the program can be performed by a combination of a main storage device and an auxiliary storage device other than those illustrated.

[0080] Next, the functions of the DSP 202 are described with reference to Figure 5 The functions of the DSP 202 are described with reference to

[0081] The DSP 202 includes a tone signal input section 2021, an effecter 2022, a decision sound generation section 2023, a function selection section 2024, a volume setting section 2025, and a sound output section 2026, each of which is a functional module. These functional modules can be realized by executing corresponding program components in the DSP 202.

[0082] The tone signal input section 2021 obtains and decodes a tone signal received via the wireless reception section 201. The decoded signal is input to the effecter 2022 and the decision sound generation section 2023. In addition, in the following description, the term "tone signal" is used as a word that refers to both analog signals and digital signals.

[0083] The effector 2022 imparts an effect to the input musical sound signal. The effector 2022 has a plurality of effect units built therein, and can impart a prescribed effect such as chorus, phaser, tremolo, vibrato, and the like to the musical sound signal.

[0084] The determination sound generating section 2023 performs tuning (pitching) based on the input musical sound signal. Specifically, based on the input musical sound signal, a frequency (hereinafter, reference frequency) for comparison is determined, and the frequency of the musical sound signal is compared with the reference frequency. For example, in a case where the input musical sound signal is considered to be a signal corresponding to A4 scale, comparison is performed using 440 Hz as the reference frequency, and the two are compared. Then, based on the result of the comparison, a signal sound (hereinafter, determination sound) indicating the result of the comparison is generated. In the present embodiment, the determination sound is one of the following three.

[0085] (1) determination sound indicating that the frequency of the musical sound signal is lower than the reference frequency (first determination sound)

[0086] (2) determination sound indicating that the frequency of the musical sound signal is higher than the reference frequency (second determination sound)

[0087] (3) determination sound indicating that the frequency of the musical sound signal is approximately the same as the reference frequency (third determination sound)

[0088] The function selection section 2024 switches the active / inactive state of the determination sound generating section 2023. The function selection section 2024 switches the active / inactive state of the determination sound generating section 2023 based on an operation performed by the operator via a not-shown switch.

[0089] Here, in a case where the determination sound generating section 2023 is made active, i.e., in a case where the pitch function is selected to be active, as described above, the determination sound (any one of the first to third determination sounds) is generated by the determination sound generating section 2023. The generated determination sound is mixed with the sound signal (hereinafter, original sound) via the effector 2022 and output.

[0090] On the other hand, in a case where the determination sound generating section 2023 is made inactive, i.e., in a case where the pitch function is selected to be inactive, processing is not performed using the determination sound generating section 2023. In this case, only the sound signal (original sound) via the effector 2022 is output.

[0091] The volume setting section 2025 attenuates the sound signal output by the determination sound generating section 2023 and the effector 2022 based on an operation by the user.

[0092] The sound signal output from the effecter 2022 and the sound signal output from the determination tone generation section 2023 are output from the sound output section 2026. The output sound signal is emitted via an amplifier 205 and a speaker 206.

[0093] Next, the processing performed by the determination tone generation section 2023 will be described with reference to Figure 6 and Figure 7

[0094] Figure 6 is a flowchart of the processing performed by the determination tone generation section 2023 in the active state. Figure 7

[0095] First, it is determined in step Sll whether or not a musical tone signal is detected. Here, in the case of a negative determination (for example, in the case where the signal level is below a prescribed value or the like), standby is performed until a musical tone signal is detected. In the case of an affirmative determination in step Sll, processing proceeds to step S12, and the frequency fl corresponding to the musical tone signal and the reference frequency fb for comparison are determined.

[0096] In step S12, the reference frequency determination section 32 first estimates the original key of the musical tone signal. For example, by performing Fourier transformation on the musical tone signal, the frequency components are extracted, and based on the extracted frequency components, the frequency fl corresponding to the musical tone signal is specified. In the case where there are multiple peaks of frequency components, the main frequency can be specified by a prescribed method.

[0097] Next, the interval is estimated from the specified frequency. Figure 8 is an example of data (hereinafter, frequency data) for determining the reference frequency from the frequency corresponding to the musical tone signal. By referring to the illustrated frequency data, the interval closest to the musical tone signal can be estimated.

[0098] Then, the reference frequency fb corresponding to the estimated interval is determined. For example, in the case where the estimated interval is A4, 440 Hz is selected as the reference frequency.

[0099] The frequency data shown in Figure 8 may be stored in advance in the ROM 203.

[0100] Further, in Figure 8 ​​In the example of the piano, the scale is set to one octave, but the frequency data is not limited to this. For example, in the case of a piano as the tuning target, frequency data in which the frequency is associated with the pitch of each of the 88 strings can be used. In addition, in the case of a bass as the tuning target, frequency data in which the frequency is associated with the pitch of each of the 4 strings can be used. In addition, in the case of a guitar as the tuning target, frequency data in which the frequency is associated with the pitch of each of the 6 strings can be used.

[0101] In addition, a plurality of frequency data can be stored. In the case where a plurality of frequency data is used, the reference frequency determining section 32 can select the frequency data to be used based on an instruction from the operator. In addition, the connected musical instrument can be automatically determined, and the frequency data to be used can be selected.

[0102] Next, the comparison section 31 compares the frequency of the tone signal with the reference frequency, and classifies it into three modes of "low", "approximately the same", and "high" (step S13). The range of approximately the same can be set to a design value, and is preferably set to a range in which the tuning is considered to be established musically.

[0103] In the case where the frequency of the tone signal is lower than the reference frequency (or a prescribed range set based on the reference frequency), the process proceeds to step S14A, and a first determination tone is generated and output. In step S14A, the selection section 33 selects the first determination tone generating section 34, and the first determination tone generating section 34 generates the first determination tone.

[0104] In addition, in the case where the frequency of the tone signal is higher than the reference frequency (or a prescribed range set based on the reference frequency), the process proceeds to step S14C, and a second determination tone is generated and output. In step S14C, the selection section 33 selects the second determination tone generating section 35, and the second determination tone generating section 35 generates the second determination tone.

[0105] In the case where the frequency of the tone signal is approximately the same as the reference frequency (or within a prescribed range set based on the reference frequency), the process proceeds to step S14B, and a third determination tone is generated and output. In step S14B, the selection section 33 selects the third determination tone generating section 36, and the third determination tone generating section 36 generates the third determination tone.

[0106] In step S15, after waiting for a prescribed time, the process proceeds to step Sll. Thus, the determination tone can be output intermittently.

[0107] Here, the determination tone will be described.

[0108] The first determination tone is preferably a sound in which it can be intuitively understood that the frequency of the currently emitted sound is lower than the reference frequency. For example, by outputting two beep sounds with different pitches (frequencies) in the order of low→high, the operator can be informed that the pitch should be raised.

[0109] The second judgment tone is preferably a tone that allows intuitive understanding that the frequency of the currently emitted sound is higher than the reference frequency. For example, by outputting two beeps with different pitches in the order of high → low, the operator can be informed that the pitch should be lowered.

[0110] (Example of the first judgment tone) Boo-bee...boo-bee...boo-bee... (Bo represents a low tone, bee represents a high tone)

[0111] (Example of the second judgment sound) Beep... Beep... Beep... (same)

[0112] In addition, the combination of the intervals of the determination tone is not limited to the ones exemplified.

[0113] Furthermore, the determination tone need not be a combination of independent beeps. For example, the direction of adjustment (whether to raise or lower the pitch) can be conveyed by outputting a sound whose pitch continuously changes (a sweep tone). Furthermore, the pitch of the sweep tone changes proportionally with time, and the rate of change is not limited to a linear function. For example, the pitch can also change exponentially with respect to time, as in an exponential chirp. This configuration can provide the operator with the impression that the pitch changes linearly.

[0114] The third determination sound is preferably a sound that allows intuitive understanding that the frequency of the currently emitted sound is substantially consistent with the reference frequency. For example, a beep sound with unchanged pitch may be output to convey that the tuning is complete.

[0115] (Example of the third judgment sound) Beep…beep…beep…beep…

[0116] In addition, the sounding interval (first period) of the determination sound in the above example changes according to the predetermined time in step S15.

[0117] As described above, the tuning device of this embodiment outputs different determination tones based on the result of comparing the frequency of a musical sound signal obtained from a musical instrument with a reference frequency. This embodiment allows intuitive understanding of the direction in which adjustment should be made (whether to raise the pitch or lower it).

[0118] Furthermore, since the musical sound signal passed through the effector is mixed with the determination sound and output, tuning can be performed while listening to the actual performance sound obtained.

[0119] The tuning device of the present embodiment is particularly suitably applied to tuning of a musical instrument capable of continuously adjusting the interval according to the operation amount. For example, in the case of tuning a stringed instrument such as a guitar, bass, piano, or the like, particularly a musical instrument provided with a string button for adjusting the tension of a string, it is preferable to observe the state of the string button or string one by one in the work, but in the case of providing information by vision as in the related art, it is not possible to concentrate the operator's awareness on the state of the musical instrument. In contrast, in the tuning device of the present embodiment, since the state is notified only by sound, it is possible to concentrate the operator on the work.

[0120] (Second Embodiment)

[0121] In the second embodiment, a variable embodiment is provided in which the prescribed time in step S15 is made variable. The hardware structure of the sound output device 20 of the second embodiment is the same as that of the first embodiment, and only the processing performed by the determination tone generation section 2023 is different.

[0122] In the second embodiment, the determination tone generation section 2023 determines the prescribed time in step S15, that is, the pitch interval of the determination tone, based on the "deviation amount of the frequency of the tone signal from the reference frequency".

[0123] Figure 9 is a diagram illustrating the pitch interval of the determination tone. In the present embodiment, in the case where the difference (deviation amount) between the frequency of the tone signal and the reference frequency is large, control is performed in such a manner that the pitch interval becomes longer. The relationship between the deviation amount and the pitch interval can be defined, for example, as in Figure 10 Such data can be stored in advance in the ROM 203.

[0124] According to the second embodiment, the operator can be notified of the size of the difference between the frequency of the tone signal and the reference frequency by sound. Thereby, the operator can easily grasp the amount of adjustment that should be performed.

[0125] Further, in the present embodiment, control is performed in such a manner that the larger the deviation amount, the longer the pitch interval, but control can also be performed in such a manner that the larger the deviation amount, the shorter the pitch interval. That is, it is only necessary that the pitch interval be related to the difference between the frequency of the tone signal and the reference frequency.

[0126] (Third Embodiment)

[0127] The third embodiment is an embodiment in which, in addition to outputting the determination tone, a sound signal indicating the reference frequency is also output. Figure 11 is a functional block diagram of the sound output device 20 (DSP 202) of the third embodiment.

[0128] In the third embodiment, the DSP 202 further includes a reference sound generation section 2027. The reference sound generation section 2027 generates a sound signal (hereinafter, a reference sound, such as a sine wave) corresponding to the reference frequency determined by the determination sound generation section 2023. The reference sound is mixed with the determination sound and the original sound, and is output via the sound output section 2026.

[0129] Further, in the third embodiment, the function selection section 2024 can switch the active state of the determination sound generation section 2023 and the active state of the reference sound generation section 2027 simultaneously or separately. For example, selection of "only the determination sound generation section 2023 is set to the active state", "the determination sound generation section 2023 and the reference sound generation section 2027 are set to the active state", and the like can be performed.

[0130] According to the third embodiment, since the operator can hear the original sound and the reference sound simultaneously, the direction in which adjustment should be performed can be grasped more easily.

[0131] (Modified Example)

[0132] The embodiments described above are merely examples, and the present application can be implemented with appropriate modifications without departing from the spirit thereof. For example, the embodiments can be implemented in combination.

[0133] Further, in the description of the embodiments, the sound output device 20 is exemplified as being connected wirelessly, but the sound tuning device of the present application can be connected by wire.

[0134] Further, the object of sound tuning can not necessarily be an electronic musical instrument, but can be any object that outputs an audio signal.

[0135] Further, in the description of the embodiments, the waiting for a predetermined time in step S15 is exemplified, but when the rising (attack) of the musical sound signal is newly detected during the waiting, the waiting can be interrupted and the determination of step S13 can be started immediately. The timing of the rising of the musical sound signal can be, for example, a timing at which the level of the musical sound signal is higher than a predetermined value.

[0136] According to the above-described structure, when the operator performs keying or picking, the determination sound is output immediately, and thus the operator can be informed of the deviation more quickly and intuitively.

Claims

1. A tuning device, characterized in that comparing a frequency of the audio signal with a reference frequency corresponding to the audio signal; and generating a sound signal for each first period when the frequency of the audio signal is slightly different from the reference frequency, and the first period is a value related to a difference between the frequency of the audio signal and the reference frequency, and the first period becomes longer or shorter as the difference becomes larger.

2. The tuning device according to claim 1, wherein the generating means generates a first sound signal when the frequency of the audio signal is lower than the reference frequency, and generates a second sound signal different from the first sound signal when the frequency of the audio signal is higher than the reference frequency.

3. The tuning device according to claim 2, wherein the first sound signal and the second sound signal are sound signals generated for each first period.

4. The tuning device according to claim 3, wherein the generating means resets counting of the first period and immediately starts generation of the first sound signal or the second sound signal when the signal obtaining means detects a rise of the audio signal.

5. The tuning device according to any one of claims 1 to 4, wherein the first sound signal and the second sound signal are a combination of two or more sounds having different intervals, the intervals are opposite in the first sound signal and the second sound signal.

6. The tuning device according to claim 5, wherein the first sound signal and the second sound signal are a sweep sound in which two or more sounds having different intervals are continuously connected. ​ ​ ​

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