CN111343562B - Music audio signal calibration system - Google Patents

Music audio signal calibration system Download PDF

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Publication number
CN111343562B
CN111343562B CN202010243358.2A CN202010243358A CN111343562B CN 111343562 B CN111343562 B CN 111343562B CN 202010243358 A CN202010243358 A CN 202010243358A CN 111343562 B CN111343562 B CN 111343562B
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resistor
signal
operational amplifier
triode
inverting input
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CN111343562A (en
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邵莹
雷钢
宋海军
许春香
陈俊民
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Zhengzhou Institute of Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Amplifiers (AREA)

Abstract

The invention discloses a music audio signal calibration system, which comprises a signal sampling module and an amplitude modulation feedback module, wherein the signal sampling module uses a signal sampler J1 with the model of DAM-3056AH to sample an original audio signal in the music audio signal calibration system, the amplitude modulation feedback module uses a triode Q1, a triode Q2 and a resistor RW1 to form an amplitude modulation circuit to adjust the amplitude of the signal, simultaneously uses an inductor L4, a capacitor C2 and an operational amplifier AR2 to form a frequency modulation circuit to filter out signal interference frequency components, one path of the output signal of the operational amplifier AR2 is input into the non-inverting input end of the operational amplifier AR3, the operational amplifier AR3 compares the signal, the two paths of the signal are buffered by the operational amplifier AR4, the operational amplifier AR5 amplifies the output signal of the operational amplifier AR4 in phase, the output signal of the operational amplifier AR3 is detected by changing the signal potential difference of the inverting input end of the operational amplifier AR5, and the output signal potential difference of the operational amplifier AR2 and the operational amplifier AR4 is detected by using the triode Q4, and finally, the output signal of the operational amplifier AR5 is an alarm analysis signal of the music audio signal calibration system terminal.

Description

Music audio signal calibration system
Technical Field
The invention relates to the technical field of audio, in particular to a music audio signal calibration system.
Background
Presently, intonation training is performed in music teaching by first recording an original sound signal (e.g., a sound originating from a natural sound source such as a human voice and a classical instrument sound) as an audio signal and then reproducing from such audio signal a sound signal that accurately reflects the original sound signal (particularly also reflecting the natural properties of the original sound signal, such as the human voice or the characteristics of a classical instrument, for example).
In order to convert sound pressure (sound) into electrical signals (e.g. generated in microphones, electric guitar pickups, etc.) and to convert electrical signals into acoustic signals (e.g. generated in loudspeakers, headphones, hydrophones, etc.), electroacoustic transducers are used, the operation of most of the electroacoustic transducers currently used being based on the interaction between an electrical conductor (essentially in the form of a coil) and a magnetic field around the conductor, so that the relative sense of sound of a trained student in teaching needs to be guaranteed for the original signal of the audio, which is then destroyed to some extent during processing by the electroacoustic transducer, resulting in impure audio in the music teaching player, seriously affecting the teaching quality.
Disclosure of Invention
In view of the above situation, an object of the present invention is to provide a music audio signal calibration system, which can sample and adjust the node signals in the music audio signal calibration system, and convert the node signals into alarm analysis signals of the music audio signal calibration system terminal.
The technical scheme includes that the music audio signal calibration system comprises a signal sampling module and an amplitude modulation feedback module, wherein the signal sampling module uses a signal sampler J1 with the model of DAM-3056AH to sample original audio signals in the music audio signal calibration system, the amplitude modulation feedback module uses a triode Q1, a triode Q2 and a resistor RW1 to form an amplitude modulation circuit to adjust signal amplitude, simultaneously uses an inductor L4, a capacitor C2 and an operational amplifier AR2 to form a frequency modulation circuit to filter signal interference frequency components, simultaneously uses the triode Q3 to detect the output signal potential of the amplitude modulation circuit, feeds back high-level signals to the anti-phase input end of the operational amplifier AR3, one path of the output signals of the operational amplifier AR2 is input to the in-phase input end of the operational amplifier AR3, the operational amplifier AR3 compares the signals, the two paths of the signals are buffered by the operational amplifier AR4, and finally the operational amplifier AR5 amplifies the output signals of the operational amplifier AR4 in the same phase, and the output signal of the operational amplifier AR3 adjusts the amplitude of the output signal of the operational amplifier AR5 by changing the signal potential of the inverting input end of the operational amplifier AR5, and the difference of the output signal potentials of the operational amplifier AR2 and the operational amplifier AR4 is detected by using the triode Q4, a signal is fed back to the base electrode of the triode Q2, the signal waveform is further adjusted, and finally the output signal of the operational amplifier AR5 is an alarm analysis signal of the music audio signal calibration system terminal.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages;
1. the triode Q1 and the triode Q2 are used for detecting signal levels, the triode Q1 and the resistor R6 are matched for detecting input signal levels, when the signals are too low, the triode Q1 is conducted, low-level components are discharged to the ground end through the variable resistor RW1, similarly, the triode Q2 is used for further detecting signal levels, abnormal low-level signals are discharged to the ground end through the resistor R8, normal signal distortion caused by too low signals can be avoided when the signals are adjusted by a next frequency modulation circuit, high-frequency and low-frequency components in the signals are filtered by components of the inductor L4 and the capacitor C2, the operational amplifier AR2 plays a role in stabilizing the static working point of the signals, and therefore frequency modulation is achieved, meanwhile, the triode Q3 is used for detecting the signal level output by the amplitude modulation circuit, high-level signals are fed back to the inverting input end of the operational amplifier AR3, and signal waveforms are further adjusted;
2. one path of the output signal of the operational amplifier AR2 is input into the non-inverting input end of the operational amplifier AR3, the operational amplifier AR3 compares the signals, the operational amplifier AR3 compares the signals, the triode Q3 plays a role in fine adjustment of the output signal of the operational amplifier AR3, the two paths of signals are buffered by the operational amplifier AR4, finally the operational amplifier AR5 amplifies the output signal of the operational amplifier AR4 in the same phase, and the output signal of the operational amplifier AR3 adjusts the amplitude of the output signal of the operational amplifier AR5 by changing the signal potential of the inverting input terminal of the operational amplifier AR5, ensures the accuracy of the output signal of the operational amplifier AR5, and the triode Q4 is used for detecting the potential difference of the output signals of the operational amplifier AR2 and the operational amplifier AR4, and feeding back signals to the base electrode of the triode Q2, so that the abnormal waveform of the signals at the non-inverting input end of the operational amplifier AR5 is prevented, the waveform of the signals is further adjusted, the accuracy of the received signals of the music audio signal calibration system terminal is ensured, and the music audio signal calibration system terminal can analyze and alarm in time.
Drawings
FIG. 1 is a block diagram of an AM feedback module of a music audio signal calibration system according to the present invention.
FIG. 2 is a block diagram of a signal sampling module of a music audio signal calibration system according to the present invention.
Detailed Description
The foregoing and other aspects, features and advantages of the invention will be apparent from the following more particular description of embodiments of the invention, as illustrated in the accompanying drawings in which reference is made to figures 1-2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
In a first embodiment, a music audio signal calibration system includes a signal sampling module and an am feedback module, the signal sampling module uses a signal sampler J1 with model of DAM-3056AH to sample an original audio signal in the music audio signal calibration system, the am feedback module uses a transistor Q1, a transistor Q2 and a resistor RW1 to form an am circuit to adjust the amplitude of a signal, uses an inductor L4, a capacitor C2 and an operational amplifier AR2 to form a fm circuit to filter out signal interference frequency components, uses the transistor Q3 to detect the output signal potential of the am circuit, feeds back a high-level signal into the inverting input terminal of the operational amplifier AR3, one path of the output signal of the operational amplifier AR2 is input to the non-inverting input terminal of the operational amplifier AR3, the operational amplifier AR3 compares the signal, two paths of the output signal are buffered by the operational amplifier AR4, and finally, the operational amplifier AR5 amplifies the output signal of the operational amplifier AR4 in the same phase, and the output signal of the operational amplifier 3 is output by changing the inverting input terminal of the operational amplifier AR5, adjusting the amplitude of the output signal of the operational amplifier AR5, detecting the potential difference of the output signals of the operational amplifier AR2 and the operational amplifier AR4 by using a triode Q4, feeding back a signal to the base electrode of a triode Q2, further adjusting the waveform of the signal, and finally outputting a signal by an operational amplifier AR5 to be an alarm analysis signal of a music audio signal calibration system terminal;
the amplitude modulation feedback module utilizes a triode Q1, a triode Q2 and a resistor RW1 to form an amplitude modulation circuit to adjust signal amplitude, utilizes the triode Q1 and the triode Q2 to detect signal level, utilizes the triode Q1 and the resistor R6 to detect input signal level in a matching manner, when the signal is too low, the triode Q1 is conducted, low level components are discharged to the ground end through the variable resistor RW1, the signal potential is further detected through the triode Q2, abnormal low level signals are discharged to the ground end through the resistor R8, normal signal distortion caused by too low signals can be avoided when the frequency modulation circuit adjusts the signal in the next step, then an inductor L4, a capacitor C2 and an operational amplifier AR2 are utilized to form the frequency modulation circuit to filter interference frequency components of the signal, high frequency and low frequency components in the signal are filtered through the inductor L4 and the capacitor C2, the operational amplifier AR2 plays a role of stabilizing the static working point of the signal, thereby realizing the frequency modulation effect, meanwhile, a triode Q3 is used for detecting the output signal potential of an amplitude modulation circuit, a high-level signal is fed back to the inverting input end of an operational amplifier AR3, the signal waveform is further adjusted, one path of the output signal of the operational amplifier AR2 is input to the non-inverting input end of the operational amplifier AR3, the operational amplifier AR3 compares the signal, the operational amplifier AR3 compares the signal, the triode Q3 plays a role in fine adjustment of the output signal of the operational amplifier AR3, the two paths of signals are buffered by the operational amplifier AR4, finally, the operational amplifier AR5 amplifies the output signal of the operational amplifier AR4 in the same phase, the output signal of the operational amplifier AR3 changes the signal potential of the inverting input end of the operational amplifier AR5, the amplitude of the output signal of the operational amplifier AR5 is adjusted, the accuracy of the output signal of the operational amplifier AR5 is ensured, the potential difference of the output signals of the operational amplifier AR2 and the operational amplifier AR4 is detected by the triode Q4, the signal is fed back to the base of the triode Q2 AR5 to prevent the signal waveform of the non-inverting input end of the operational amplifier AR 35AR 357 AR to further adjust the signal waveform, the accuracy of the music audio signal calibration system terminal receiving signals is ensured;
the amplitude modulation feedback module has the specific structure that the emitting electrode of the triode Q is connected with one end of a resistor R, a resistor R and one end of a capacitor C, the other end of the resistor R is grounded, the base electrode of the triode Q is connected with the other end of the resistor R and one end of the resistor R, the collector electrode of the triode Q is connected with the other end of the resistor R, the other end of the resistor RW is grounded, the emitting electrode of the triode Q is connected with the resistor R, one end of the resistor R, an inductor L, one end of the capacitor C and the base electrode of the triode Q, the other end of the resistor R is connected with the other end of the capacitor C, the collector electrode of the triode Q is connected with one end of the resistor R, the other end of the resistor R is connected with the other end of the resistor R and +5V of a power supply, the emitting electrode of the triode Q is connected with one end of the resistor R, the other end of the inductor L is connected with the resistor R, the base electrode of the resistor R is connected with the other end of the base electrode of the resistor R, the base electrode of the resistor R is connected with the base electrode of the resistor R, the resistor R is connected with the base electrode of the resistor R, the resistor R is connected with the base electrode of the base electrode of the resistor R is connected with the resistor R, the base electrode of the base electrode of the resistor R, the base of the resistor Q is connected with the base of the resistor R, the base of the resistor R, the base of the resistor R is connected with the base of the resistor R, the base of the resistor R, the base of the base, One end of a resistor R13 and one end of a capacitor C3, the other ends of the resistor R13 and the capacitor C3 are grounded, the other end of the resistor R12 is connected to an inverting input terminal of the amplifier AR2, an output terminal of the amplifier AR2, a non-inverting input terminal of the amplifier AR4 and a non-inverting input terminal of the amplifier AR3, one end of the resistor R15 and a base of the transistor Q15, the non-inverting input terminal of the amplifier AR 15 is connected to the resistor R15, the other end of the capacitor C15, the inverting input terminal of the amplifier AR 15 is connected to the other end of the resistor R15, an emitter of the transistor Q15 is connected to one end of the resistor R15 and the base of the transistor Q15, the other end of the resistor R15 is grounded, one end of the output terminal of the amplifier AR 15, the non-inverting input terminal of the amplifier AR 15 and a collector of the transistor Q15, one end of the adjustable resistor RW 15, the other end of the adjustable resistor R15 is connected to the inverting input terminal of the power supply 365 + V, and the inverting input terminal of the amplifier AR 15. The inverting input end of the operational amplifier AR5 is connected with one end of the resistor R17, one end of the resistor R19 and the output end of the operational amplifier AR3, the other end of the resistor R17 is grounded, and the output end of the operational amplifier AR5 is connected with the other end of the resistor R19 and the audio and video signal calibration system terminal.
On the basis of the scheme, the signal sampling module comprises a DAM-3056AH signal sampler J1, a power supply end of a signal sampler J1 is connected with +5V, a ground end of the signal sampler J1 is grounded, an output end of the signal sampler J1 is connected with a negative electrode of a voltage regulator tube D1 and a non-inverting input end of an operational amplifier AR1, a positive electrode of a voltage regulator tube D1 is grounded, an inverting input end of the operational amplifier AR1 is connected with one end of a resistor R1 and a resistor R2, the other end of the resistor R1 is grounded, and an output end of the operational amplifier AR1 is connected with the other end of the resistor R2 and the other end of the resistor R3.
When the invention is used in concrete, the music audio signal calibration system comprises a signal sampling module and an amplitude modulation feedback module, wherein the signal sampling module uses a signal sampler J1 with the model of DAM-3056AH to sample an original audio signal in the music audio signal calibration system, the amplitude modulation feedback module uses a triode Q1, a triode Q2 and a resistor RW1 to form an amplitude modulation circuit to adjust the amplitude of the signal, uses a triode Q1 and a triode Q2 to detect the signal level, a triode Q1 and a resistor R6 are matched to detect the input signal level, when the signal is too low, the triode Q1 is conducted, the low level component is discharged to the ground end through a variable resistor RW1, the signal potential is further detected by the triode Q2, the abnormal low level signal is discharged to the ground end through a resistor R8, the normal signal distortion caused by the too low signal in the next step of frequency modulation circuit adjustment can be avoided, then, an inductor L4, a capacitor C2 and an operational amplifier AR2 are used for forming a frequency modulation circuit to filter signal interference frequency components, an inductor L4 and a capacitor C2 are used for filtering high-frequency and low-frequency components in signals, the operational amplifier AR2 plays a role in stabilizing a signal static working point, so that the frequency modulation effect is achieved, meanwhile, a triode Q3 is used for detecting the output signal potential of an amplitude modulation circuit, a high-level signal is fed back to an inverting input end of the operational amplifier AR3, the signal waveform is further adjusted, one path of the output signal of the operational amplifier AR2 is input to an non-inverting input end of the operational amplifier AR3, the operational amplifier AR3 compares the signal, the operational amplifier AR3 compares the signal, the triode Q3 plays a role in fine adjustment of the output signal of the operational amplifier AR3, the two paths of the signal are buffered by the operational amplifier AR4, finally, the operational amplifier AR5 amplifies the output signal of the operational amplifier AR4 in the same phase, the output signal of the operational amplifier AR3 adjusts the output signal by changing the inverting input end of the operational amplifier AR5, adjusts the amplitude of the output signal of the operational amplifier 5, the precision of the output signal of the operational amplifier AR5 is ensured, the triode Q4 is used for detecting the potential difference of the output signals of the operational amplifier AR2 and the operational amplifier AR4, a signal is fed back to the base electrode of the triode Q2, the abnormal signal waveform of the non-inverting input end of the operational amplifier AR5 is prevented, the signal waveform is further adjusted, and the accuracy of the signal receiving of the music audio signal calibration system terminal is ensured.
While the invention has been described in further detail with reference to specific embodiments thereof, it is not intended that the invention be limited to the specific embodiments thereof; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.

Claims (2)

1. A music audio signal calibration system comprises a signal sampling module and an amplitude modulation feedback module, wherein the signal sampling module samples an original audio signal in the music audio signal calibration system by using a signal sampler J1 with the model of DAM-3056AH, the amplitude modulation feedback module uses a triode Q1, a triode Q2 and a resistor RW1 to form an amplitude modulation circuit to adjust the amplitude of the signal, uses an inductor L4, a capacitor C2 and an operational amplifier AR2 to form a frequency modulation circuit to filter out signal interference frequency components, uses the triode Q3 to detect the output signal potential of the amplitude modulation circuit, feeds back a high-level signal into the reverse phase input end of the operational amplifier AR3, one path of the output signal of the operational amplifier AR2 is input into the non-phase input end of the operational amplifier AR3, the operational amplifier AR3 compares the signal, the two paths of the output signal are buffered by the operational amplifier AR4, the operational amplifier AR5 amplifies the output signal of the operational amplifier AR4 in phase, and the output signal of the operational amplifier AR3 is output by changing the signal potential of the reverse phase input end of the operational amplifier AR5, adjusting the amplitude of the output signal of the operational amplifier AR5, detecting the potential difference of the output signals of the operational amplifier AR2 and the operational amplifier AR4 by using a triode Q4, feeding back a signal to the base electrode of a triode Q2, further adjusting the waveform of the signal, and finally outputting a signal by an operational amplifier AR5 to be an alarm analysis signal of a music audio signal calibration system terminal;
the amplitude modulation feedback module comprises a triode Q, wherein an emitting electrode of the triode Q is connected with one end of a resistor R, one end of the resistor R and one end of a capacitor C, the other end of the resistor R is grounded, a base electrode of the triode Q is connected with the other end of the resistor R and one end of the resistor R, a collector electrode of the triode Q is connected with the other end of the resistor R, the other end of the resistor RW is grounded, an emitting electrode of the triode Q is connected with the resistor R, one end of an inductor L, one end of the capacitor C and the base electrode of the triode Q, the other end of the resistor R is connected with the other end of the capacitor C, a collector electrode of the triode Q is connected with one end of the resistor R, the other end of the resistor R is connected with the other end of the resistor R and +5V of a power supply, the emitting electrode of the triode Q is connected with one end of the resistor R, the other end of the inductor L is connected with the resistor R, one end of the resistor R, One end of a resistor R13 and one end of a capacitor C3, the other ends of the resistor R13 and the capacitor C3 are grounded, the other end of the resistor R12 is connected to an inverting input terminal of the amplifier AR2, an output terminal of the amplifier AR2, a non-inverting input terminal of the amplifier AR4 and a non-inverting input terminal of the amplifier AR3, one end of the resistor R15 and a base of the transistor Q15, the non-inverting input terminal of the amplifier AR 15 is connected to the resistor R15, the other end of the capacitor C15, the inverting input terminal of the amplifier AR 15 is connected to the other end of the resistor R15, an emitter of the transistor Q15 is connected to one end of the resistor R15 and the base of the transistor Q15, the other end of the resistor R15 is grounded, one end of the output terminal of the amplifier AR 15, the non-inverting input terminal of the amplifier AR 15 and a collector of the transistor Q15, one end of the adjustable resistor RW 15, the other end of the adjustable resistor R15 is connected to the inverting input terminal of the power supply 365 + V, and the inverting input terminal of the amplifier AR 15. The inverting input end of the operational amplifier AR5 is connected with one end of the resistor R17, one end of the resistor R19 and the output end of the operational amplifier AR3, the other end of the resistor R17 is grounded, and the output end of the operational amplifier AR5 is connected with the other end of the resistor R19 and the audio and video signal calibration system terminal.
2. The music audio signal calibration system of claim 1, wherein the signal sampling module comprises a signal sampler J1 with model number DAM-3056AH, a power supply terminal of the signal sampler J1 is connected with +5V, a ground terminal of the signal sampler J1 is connected with ground, an output terminal of the signal sampler J1 is connected with a negative electrode of a voltage regulator D1 and a non-inverting input terminal of an operational amplifier AR1, an anode of a voltage regulator D1 is connected with ground, an inverting input terminal of the operational amplifier AR1 is connected with one end of a resistor R1 and a resistor R2, the other end of the resistor R1 is connected with ground, and an output terminal of the operational amplifier AR1 is connected with the other end of the resistor R2 and the other end of the resistor R3.
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CN204206394U (en) * 2014-10-30 2015-03-11 云晖软件(成都)有限公司 A kind of wireless microphone of reliable operation
CN207399447U (en) * 2017-09-11 2018-05-22 管文佳 A kind of microphone normalization calibrator (-ter) unit based on FPGA frequency domain filterings
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