CN112532208A - Harmonic generator and method for generating harmonics - Google Patents
Harmonic generator and method for generating harmonics Download PDFInfo
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- CN112532208A CN112532208A CN201910883088.9A CN201910883088A CN112532208A CN 112532208 A CN112532208 A CN 112532208A CN 201910883088 A CN201910883088 A CN 201910883088A CN 112532208 A CN112532208 A CN 112532208A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/093—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal using special filtering or amplification characteristics in the loop
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Abstract
The application discloses a harmonics generator and a method for generating harmonics, the harmonics generator comprising: an energy detection unit for receiving an input signal and detecting a plurality of energy values of the input signal in a plurality of different frequency bands; a maximum value detector connected to the energy detection unit for detecting a maximum energy value among the plurality of energy values; a harmonic generation unit connected to the maximum value detector for determining a fundamental frequency of the input signal according to the maximum energy value and generating harmonics according to a correspondence between frequencies of the fundamental frequency and the notes, wherein different frequencies correspond to different notes. The harmonics generator of the present application is capable of generating any number of harmonic components based on the fundamental frequency of the input audio signal, without introducing additional THD and without introducing additional, unnecessary overtones, in addition to the actual harmonics that are desired to be generated.
Description
Technical Field
The present application relates to a harmonics generator and a method for generating harmonics.
Background
In the related art, there are methods of generating harmonic components based on the fundamental frequency of an input signal, but these methods are not satisfactory in every aspect. Accordingly, there is a need for improvements in methods of generating harmonics.
Disclosure of Invention
To address the problems in the related art, the present application proposes a harmonic generator and a method for generating harmonics without introducing additional THD and additional overtones.
The technical scheme of the application is realized as follows:
according to an aspect of the present application, there is provided a harmonics generator comprising:
an energy detection unit for receiving an input signal and detecting a plurality of energy values of the input signal in a plurality of different frequency bands;
a maximum value detector connected to the energy detection unit for detecting a maximum energy value among the plurality of energy values;
a harmonic generation unit connected to the maximum value detector for determining a fundamental frequency of the input signal according to the maximum energy value and generating harmonics according to a correspondence between frequencies of the fundamental frequency and the notes, wherein different frequencies correspond to different notes.
According to an embodiment of the application, an energy detection unit includes: a plurality of band pass filters to each of which an input signal is input to form a plurality of energy values of the input signal in a plurality of frequency bands; and the detectors are respectively connected to the corresponding band-pass filters and used for detecting a plurality of energy values.
According to an embodiment of the application, the harmonics generator further comprises: and a programmable gain unit connected to the harmonic generation unit and the energy detection unit for controlling an amount of gain for the harmonics according to the input signals in the plurality of frequency bands.
According to an embodiment of the present application, a harmonic generation unit includes: the table look-up module is connected to the maximum value detector and comprises corresponding relations between different frequencies and different notes; the harmonic generation module is connected to the table look-up module; the table look-up module is used for generating a control code corresponding to the corresponding musical note according to the frequency of the fundamental frequency and sending the control code to the harmonic generation module so that the harmonic generation module generates a harmonic according to the control code.
According to an embodiment of the application, the harmonics generator further comprises: and the multiplexer is connected between the energy detection unit and the programmable gain unit and is also connected to the table look-up module, and the multiplexer selects one of the input signals in the plurality of frequency bands according to the control code and sends the selected input signal to the programmable gain unit so as to control the gain amount.
According to an embodiment of the application, the harmonic generation unit comprises a programmable sinusoidal harmonic generator.
According to an embodiment of the application, the harmonics generator further comprises: and the low-pass filter is connected to the input end of the energy detection unit and is used for sending the input signal after the low-pass filtering processing to the energy detection unit.
According to another aspect of the present application, there is provided a method for generating harmonics, including:
detecting a plurality of energy values of an input signal in a plurality of different frequency bands;
detecting a maximum energy value of the plurality of energy values;
the fundamental frequency of the input signal is determined from the maximum energy value, and harmonics are generated from a correspondence between frequencies of the fundamental frequency and the notes, wherein different frequencies correspond to different notes.
According to an embodiment of the present application, detecting a plurality of energy values of an input signal in a plurality of different frequency bands comprises: inputting the input signal to a plurality of band pass filters, respectively, to form a plurality of energy values of the input signal in a plurality of frequency bands; the plurality of energy values are detected by a plurality of detectors respectively connected to the plurality of band pass filters.
According to an embodiment of the application, generating the harmonic comprises: generating a control code corresponding to the corresponding musical note according to the frequency of the fundamental frequency and a lookup table, and generating a harmonic according to the control code, wherein the lookup table comprises corresponding relations between different frequencies and different musical notes; one of the input signals in the plurality of frequency bands is selected according to a control code to control an amount of gain for the harmonics.
Through the technical scheme, the harmonic generator can generate harmonic components of any times based on the fundamental frequency of the input audio signal, and extra THD cannot be introduced through processing in a system except actual harmonic waves expected to be generated; in addition, no additional, unnecessary overtones are introduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a harmonics generator according to an embodiment of the present application;
fig. 2 is a flow chart of a method for generating harmonics according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments that can be derived from the embodiments given herein by a person of ordinary skill in the art are intended to be within the scope of the present disclosure.
Fig. 1 shows a schematic diagram of a harmonics generator according to an embodiment of the present application. As shown in fig. 1, the harmonics generator of the present application may include an energy detection unit 120, a maximum value detector 130, and a harmonic generation unit 140. The maximum value detector 130 is connected to the energy detection unit 120, and the harmonic generation unit 140 is connected to the maximum value detector 130. The energy detection unit 120 may receive an input signal, which in one embodiment is an audio signal x. The energy detection unit 120 may also detect a plurality of energy values of the input signal in a plurality of different frequency bands. The maximum value detector 130 may detect a maximum energy value among the plurality of energy values. The harmonic generation unit 140 determines the maximum energy value detected by the maximum value detector 130 as the fundamental frequency of the input signal. Since different frequencies of the fundamental frequency correspond to different notes, the harmonic generation unit 140 may generate harmonics according to a correspondence between the frequencies of the fundamental frequency and the notes.
In some embodiments, the harmonics generator of the present application may further include a low pass filter 110, and the low pass filter 110 is connected to an input of the energy detection unit 120. The low pass filter 110 may perform a low pass filtering process on the input signal and transmit the input signal after the low pass filtering process to the energy detection unit 120. In one embodiment, the energy detection unit 120 may include a plurality of band pass filters F1, F2, … …, Fm to each of which an input signal is input to form a plurality of energy values of the input signal in a plurality of frequency bands. The energy detection unit 120 may further include a plurality of detectors D1, D2, … …, Dm, the plurality of detectors D1, D2, … …, Dm being respectively connected to the corresponding plurality of band pass filters F1, F2, … …, Fm and detecting the plurality of energy values. Wherein m is a positive integer. In one embodiment, the detectors D1, D2, … …, Dm may be level detectors, so that energy values may be detected by detecting level amplitudes of the outputs of the plurality of band pass filters F1, F2, … …, Fm.
Specifically, referring to fig. 1, an audio signal x is first input, and the frequency content of the audio signal x may be limited to expose more of its fundamental frequency content using a low pass filter 110. The output signal of the low-pass filter 110 is then sent to a filter bank formed by a plurality of band-pass filters F1, F2, … …, Fm, the plurality of band-pass filters F1, F2, … …, Fm of the filter bank being connected in one-to-one correspondence with the plurality of detectors D1, D2, … …, Dm, so that a measurement value of the energy value of the audio signal x in each frequency band can be obtained by the plurality of band-pass filters F1, F2, … …, Fm and the plurality of detectors D1, D2, … …, Dm. Then, the maximum value detector 130 detects the maximum energy value among the plurality of energy values output from the detectors D1, D2, … …, Dm.
Subsequently, harmonics are generated by the harmonic generation unit 140. In one embodiment, the harmonic generation unit 140 may include a table look-up module 142, the table look-up module 142 is connected to the maximum detector 130, and the table look-up module 142 includes the corresponding relationship between different frequencies and different notes. In one embodiment, the lookup module 142 includes a lookup table that maps the previous maximum energy value output by the maximum detector 130 to a control code, such as a number, that indicates the selected frequency and corresponding note. The harmonic generation unit 140 may also include a harmonic generation module 144 connected to the look-up table module 142. The table lookup module 142 sends the generated control code to the harmonic generation module 144, and the harmonic generation module 144 may generate a harmonic according to the control code. In one embodiment, the harmonic generation module 144 is a programmable harmonic generation module, such as a programmable sine harmonic generator. The programmable harmonic generation module may be programmed to generate any harmonic of the fundamental frequency of the audio signal x upon receipt of the control code. It will be appreciated that the final generated harmonics may depend entirely on the mapping in the look-up table.
Further, in order to follow the note level of the audio signal x, a programmable gain unit 150 may be provided after the harmonic generation unit 140, the programmable gain unit 150 being connected to the harmonic generation unit 140 and the energy detection unit 120, respectively, and serving to control the amount of gain for harmonics according to input signals in a plurality of frequency bands. In addition, the harmonics generator of the present application may further include a multiplexer 160, the multiplexer 160 being connected between the energy detection unit 120 and the programmable gain unit 150 and also connected to the look-up table module 142. The multiplexer 160 may select one of the input signals in the plurality of frequency bands to send to the programmable gain unit 150 to control the amount of gain for the harmonics based on the control code sent by the look-up table module 142. Specifically, after the multiplexer 160 receives all the energy values output by the detectors D1, D2, … …, Dm and the control code generated by the table lookup module 142, the multiplexer 160 can determine the musical note assigned by the table lookup module 142 to the harmonic generation module 144 according to the control code, and then allow the signal corresponding to the musical note to pass through, so as to control the gain of the programmable gain unit 150. That is, the amount of gain of the programmable gain unit 150 can be controlled by the energy values output by the detectors D1, D2, … …, Dm, thereby varying the amount of gain that needs to be introduced for each different note.
In summary, with the above technical solution of the present application, the Harmonic generator of the present application can generate any number of Harmonic components based on the fundamental frequency of the input audio signal, and no additional THD (Total Harmonic Distortion) is introduced by the processing in the system except the actual Harmonic that is desired to be generated; in addition, no additional, unnecessary overtones (overtones) are introduced.
As shown in fig. 2, there is also provided a method for generating harmonics according to an embodiment of the present application, including the steps of:
s202, detecting a plurality of energy values of an input signal in a plurality of different frequency bands;
s204, determining the fundamental frequency of the input signal according to the maximum energy value in the plurality of energy values;
and S206, generating harmonics according to the corresponding relation between the frequency of the fundamental frequency and the musical notes, wherein different frequencies correspond to different musical notes.
In one embodiment, detecting a plurality of energy values of the input signal in a plurality of different frequency bands at step S202 may comprise: inputting the input signal to a plurality of band pass filters, respectively, to form a plurality of energy values of the input signal in a plurality of frequency bands; the plurality of energy values are detected by a plurality of detectors respectively connected to the plurality of band pass filters.
In one embodiment, at step S206, generating harmonics may include: generating a control code corresponding to the corresponding musical note according to the frequency of the fundamental frequency and a lookup table, and generating a harmonic according to the control code, wherein the lookup table comprises corresponding relations between different frequencies and different musical notes; and, one of the input signals in the plurality of frequency bands is selected according to the control code to control the amount of gain for the harmonics.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A harmonics generator, comprising:
an energy detection unit for receiving an input signal and detecting a plurality of energy values of the input signal in a plurality of different frequency bands;
a maximum value detector connected to the energy detection unit for detecting a maximum energy value among the plurality of energy values;
a harmonic generation unit connected to the maximum value detector for determining a fundamental frequency of the input signal according to the maximum energy value and generating harmonics according to a correspondence between frequencies of the fundamental frequency and notes, wherein different frequencies correspond to different notes.
2. The harmonics generator of claim 1, wherein the energy detection unit comprises:
a plurality of band pass filters to each of which the input signal is input to form the plurality of energy values of the input signal in the plurality of frequency bands;
and the detectors are respectively connected to the corresponding band-pass filters and are used for detecting the energy values.
3. The harmonics generator of claim 1, further comprising:
a programmable gain unit connected to the harmonic generation unit and the energy detection unit for controlling an amount of gain for the harmonics according to the input signal in the plurality of frequency bands.
4. The harmonics generator of claim 3, wherein the harmonics generating unit comprises:
the table look-up module is connected to the maximum value detector and comprises corresponding relations between the different frequencies and the different notes;
the harmonic generation module is connected to the table look-up module;
the table look-up module is used for generating a control code corresponding to the corresponding musical note according to the frequency of the fundamental frequency and sending the control code to the harmonic generation module so that the harmonic generation module generates the harmonic according to the control code.
5. The harmonics generator of claim 4, further comprising:
a multiplexer connected between the energy detection unit and the programmable gain unit and further connected to the look-up table module, the multiplexer selecting one of the input signals in the plurality of frequency bands to send to the programmable gain unit to control the amount of gain according to the control code.
6. The harmonics generator of claim 1, wherein the harmonics generation unit comprises a programmable sinusoidal harmonics generator.
7. The harmonics generator of any of claims 1-6, further comprising:
and the low-pass filter is connected to the input end of the energy detection unit and is used for sending the input signal after the low-pass filtering processing to the energy detection unit.
8. A method for generating harmonics, comprising:
detecting a plurality of energy values of an input signal in a plurality of different frequency bands;
detecting a maximum energy value of the plurality of energy values;
determining a fundamental frequency of the input signal according to the maximum energy value, and generating harmonics according to a correspondence between frequencies of the fundamental frequency and notes, wherein different frequencies correspond to different notes.
9. The method of claim 8, wherein detecting a plurality of energy values of the input signal in a plurality of different frequency bands comprises:
inputting the input signal to a plurality of bandpass filters, respectively, to form the plurality of energy values of the input signal in the plurality of frequency bands;
detecting the plurality of energy values by a plurality of detectors respectively connected to the plurality of band pass filters.
10. The method of claim 8, wherein generating the harmonic comprises:
generating a control code corresponding to the corresponding note according to the frequency of the fundamental frequency and a lookup table, and generating the harmonic according to the control code, wherein the lookup table comprises corresponding relations between the different frequencies and the different notes;
selecting one of the input signals in the plurality of frequency bands to control an amount of gain for the harmonic in accordance with the control code.
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