CN112532208B - Harmonic generator and method for generating harmonics - Google Patents
Harmonic generator and method for generating harmonics Download PDFInfo
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- CN112532208B CN112532208B CN201910883088.9A CN201910883088A CN112532208B CN 112532208 B CN112532208 B CN 112532208B CN 201910883088 A CN201910883088 A CN 201910883088A CN 112532208 B CN112532208 B CN 112532208B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000001914 filtration Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 230000005236 sound signal Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
-
- 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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- Electrophonic Musical Instruments (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
Disclosed herein are a harmonic generator and a method for generating a harmonic, the harmonic generator including: 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 of the plurality of energy values; and a harmonic generation unit connected to the maximum detector for determining a fundamental frequency of the input signal according to the maximum energy value and generating a harmonic according to a correspondence between a frequency of the fundamental frequency and the notes, wherein different frequencies correspond to different notes. The harmonic 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, other than the actual harmonics desired to be generated.
Description
Technical Field
The present application relates to a harmonic generator and a method for generating harmonics.
Background
In the prior art, methods exist for generating harmonic components based on the fundamental frequency of an input signal, but these methods are not satisfactory in all respects. Accordingly, improvements in the methods of generating harmonics are needed.
Disclosure of Invention
In view of 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 one aspect of the present application, there is provided a harmonic 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 of the plurality of energy values;
and a harmonic generation unit connected to the maximum detector for determining a fundamental frequency of the input signal according to the maximum energy value and generating a harmonic according to a correspondence between a frequency of the fundamental frequency and the notes, wherein different frequencies correspond to different notes.
According to an embodiment of the present 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 are used for detecting a plurality of energy values.
According to an embodiment of the present application, the harmonic generator further comprises: and a programmable gain unit connected to the harmonic generation unit and the energy detection unit for controlling the gain amount for the harmonic according to the input signals in the plurality of frequency bands.
According to an embodiment of the present application, the harmonic generation unit includes: the table look-up module is connected to the maximum detector and comprises corresponding relations between different frequencies and different phonetic symbols; the harmonic generation module is connected to the table look-up module; the table look-up module is used for generating control codes corresponding to corresponding notes according to the frequency of the fundamental frequency and sending the control codes to the harmonic generation module so that the harmonic generation module generates harmonic according to the control codes.
According to an embodiment of the present application, the harmonic 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 selects one of the input signals in a 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 present application, the harmonic generation unit comprises a programmable sinusoidal harmonic generator.
According to an embodiment of the present application, the harmonic 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, 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;
a fundamental frequency of the input signal is determined according to the maximum energy value, and harmonics are generated according to a correspondence between frequencies of the fundamental frequency and 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 includes: 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 present application, generating harmonics includes: generating control codes corresponding to the corresponding notes according to the frequencies of the fundamental frequencies and a lookup table, and generating harmonics according to the control codes, wherein the lookup table comprises corresponding relations between different frequencies and different notes; one of the input signals in a plurality of frequency bands is selected according to the control code to control the amount of gain for the harmonics.
By the technical scheme, the harmonic generator can generate harmonic components of any times based on the fundamental frequency of an input audio signal, and no additional THD is introduced by processing in a system except for the actual harmonic which is 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 that are needed 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 that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a harmonic 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 following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.
Fig. 1 shows a schematic diagram of a harmonic generator according to an embodiment of the present application. As shown in fig. 1, the harmonic 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 detector 130 is connected to the energy detection unit 120, and the harmonic generation unit 140 is connected to the maximum 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 detector 130 may detect a maximum energy value of the plurality of energy values. The harmonic generation unit 140 determines the maximum energy value detected by the maximum 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 harmonic generator of the present application may further comprise a low pass filter 110, the low pass filter 110 being 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 which an input signal is input to each of the band pass filters F1, F2, … …, fm 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 being configured to detect a plurality of energy values. Wherein m is a positive integer. In one embodiment, the detectors D1, D2, … …, dm may be level detectors, so that the energy value may be detected by detecting the magnitude of the level output by 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 the fundamental frequency content thereof 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 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. The maximum value detector 130 then detects the maximum energy value among the plurality of energy values output from the detectors D1, D2, … …, dm.
Subsequently, harmonics are generated by the harmonics generation unit 140. In one embodiment, the harmonic generation unit 140 may include a table lookup module 142, the table lookup module 142 being connected to the maximum value detector 130, the table lookup module 142 including correspondence between different frequencies and different phones. In one embodiment, the look-up module 142 includes a look-up table that maps the maximum energy value output by the previous maximum detector 130 to a control code, such as a number, that may represent the selected frequency and corresponding note. The harmonic generation unit 140 may further include a harmonic generation module 144 coupled to the look-up table module 142. Wherein the lookup module 142 sends the generated control code to the harmonic generation module 144, from which the harmonic generation module 144 can generate harmonics. In one embodiment, the harmonic generation module 144 is a programmable harmonic generation module, such as a programmable sinusoidal 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 ultimately 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 being configured to control the gain amount for the harmonic according to the input signals in the plurality of frequency bands. In addition, the harmonic 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 further 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 be sent to the programmable gain unit 150 to control the amount of gain for the harmonics according to the control code sent by the look-up table module 142. Specifically, after the multiplexer 160 receives all energy values output by the detectors D1, D2, … …, dm and the control code generated by the table look-up module 142, the multiplexer 160 may determine the note allocated by the table look-up module 142 to the harmonic generation module 144 according to the control code, and may allow the signal corresponding to the note to pass through, so as to control the gain of the programmable gain unit 150. That is, the gain amount of the programmable gain unit 150 may be controlled by the energy values output by the detectors D1, D2, … …, dm, thereby changing the gain amount that needs to be introduced for each different symbol.
In summary, with the above technical solution of the present application, the harmonic generator of the present application can generate any harmonic component 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 for 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 energy values;
s206, generating harmonics according to the corresponding relation between the frequency of the fundamental frequency and the notes, wherein different frequencies correspond to different notes.
In one embodiment, at step S202, detecting a plurality of energy values of an input signal in a plurality of different frequency bands may include: 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 control codes corresponding to the corresponding notes according to the frequencies of the fundamental frequencies and a lookup table, and generating harmonics according to the control codes, wherein the lookup table comprises corresponding relations between different frequencies and different notes; and, one of the input signals in a plurality of frequency bands is selected according to the control code to control the gain amount for the harmonic.
The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but rather is intended to cover any and all modifications, equivalents, alternatives, and improvements within the spirit and principles 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 detector connected to the energy detection unit for detecting a maximum energy value of the plurality of energy values;
and a harmonic generation unit connected to the maximum detector for determining a fundamental frequency of the input signal according to the maximum energy value and generating a harmonic according to a correspondence between a frequency of the fundamental frequency and a note, wherein different frequencies correspond to different notes.
2. The harmonics generator according to claim 1, wherein said 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 according to claim 1, further comprising:
and a programmable gain unit connected to the harmonic generation unit and the energy detection unit for controlling the gain amount for the harmonic according to the input signals in the plurality of frequency bands.
4. A harmonics generator according to claim 3, characterized in that 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 phones;
the harmonic generation module is connected to the table look-up module;
the table look-up module is used for generating control codes corresponding to corresponding notes according to the frequency of the fundamental frequency and sending the control codes to the harmonic generation module so that the harmonic generation module generates the harmonic according to the control codes.
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 gain amount according to the control code.
6. The harmonics generator according to claim 1, wherein said harmonics generating unit comprises a programmable sinusoidal harmonics generator.
7. The harmonics generator according to 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;
a fundamental frequency of the input signal is determined from the maximum energy value, and harmonics are generated from 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 band pass filters, respectively, to form the plurality of energy values of the input signal in the 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.
10. The method of claim 8, wherein generating the harmonic comprises:
generating control codes corresponding to corresponding notes according to the frequencies of the fundamental frequencies and a lookup table, and generating the harmonic waves according to the control codes, wherein the lookup table comprises corresponding relations between the different frequencies and the different notes;
one of the input signals in the plurality of frequency bands is selected according to the control code to control an amount of gain for the harmonic.
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