CN212909443U - Audio signal generator capable of continuously and greatly adjusting crest factor - Google Patents
Audio signal generator capable of continuously and greatly adjusting crest factor Download PDFInfo
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- CN212909443U CN212909443U CN202021024151.8U CN202021024151U CN212909443U CN 212909443 U CN212909443 U CN 212909443U CN 202021024151 U CN202021024151 U CN 202021024151U CN 212909443 U CN212909443 U CN 212909443U
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Abstract
The utility model discloses an audio signal generator of adjustable crest factor by a wide margin in succession, including voltage-controlled amplifier control circuit and respectively with sine wave generator control circuit, adjustable impulse generator control circuit and the buffer amplification output transform control circuit that voltage-controlled amplifier control circuit electricity is connected, sine wave generator control circuit generates the sine wave, the sine wave is sent voltage-controlled amplifier control circuit and is enlargied, and the audio pulse signal who generates by adjustable impulse generator control circuit changes voltage-controlled amplifier control circuit's magnification times, and the audio pulse signal through voltage-controlled amplifier control circuit processing passes through the buffer amplification output transform control circuit and exports. The utility model discloses can generate crest factor adjustable audio test signal by a wide margin, be convenient for test high efficiency power amplifier's operating mass.
Description
Technical Field
The utility model relates to an audio signal generator, concretely relates to can be in succession by a wide margin audio signal generator of adjustable crest factor.
Background
The music has obvious rhythm sense of high and low fluctuation, so that the instantaneous output power of the working audio power amplifier (for short, power amplifier) changes greatly in time. As shown in fig. 1, which is a waveform of amplitude versus time for a piece of music, it can be seen that the time at which the maximum amplitude occurs is short.
In the scientific community, the ratio of the peak value to the effective value of a section of waveform is called as a crest factor, and the crest factor of a typical music signal is 3-10; this means that the power amplifier requires more than ten times the power reserve. In other words, it is: most of the working time of a power amplifier with the maximum output power of 1500 watts is in the working state of output power of 150 watts to 500 watts, so that a power supply system and a heat dissipation system of a plurality of power amplifiers are not designed or do not need to be designed according to the consumption capable of supporting the output power of 1500 watts continuously. But why did this not previously cause the problem of improper testing methods? The main reason is that most of the current-year mainstream power amplifiers are AB circuits with low power below 300 watts and low efficiency, the AB circuits are mostly about 62% low efficiency, and the AB circuits need to be fully charged on a power supply and heat dissipation, so that short-time continuous sine wave tests cannot cause problems. However, with the progress of technology in recent years, the efficiency of a high-power amplifier reaches more than 88% due to the presence of class AB and class D power amplifiers powered by dynamic switching power supplies, the power amplifier can be supported by an energy storage element such as a large capacitor in the power amplifier to carry music climax, and then the energy of the energy storage element is supplemented to meet the next climax when the music climax is low. At this time, if the traditional continuous sine wave test mode is used, the power of the tested power amplifier is insufficient or the overload protection of the power amplifier is triggered, and if the time is longer, the overheat protection of the power amplifier is even caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the shortcoming and not enough among the prior art, provide an audio signal generator that can continuous adjustable crest factor by a wide margin that can the test effect good, that the measuring accuracy is high.
The utility model discloses a realize through following technical scheme:
the sine wave generator control circuit generates sine waves which are sent to the voltage-controlled amplifier control circuit for amplification, the amplification multiple of the voltage-controlled amplifier control circuit is changed by an audio pulse signal generated by the adjustable pulse generator control circuit, and the audio pulse signal processed by the voltage-controlled amplifier control circuit is output by the buffer amplification output conversion control circuit.
Further, the voltage controlled amplifier control circuit includes a variable gain amplifier, a span operational amplifier, or a multiplier.
Further, the voltage controlled amplifier control circuit includes a pulse intensity adjustment circuit.
Further, the sine wave generator control circuit comprises a Venturi bridge circuit.
Further, the sine wave generator control circuit comprises a signal frequency shifting circuit and a signal frequency adjusting circuit.
Further, the adjustable pulse generator control circuit comprises a single chip microcomputer, a pulse width modulation chip capable of changing the frequency of the triangular wave, an NE555 time-base circuit or a Schmitt trigger.
Further, the singlechip is an MEGA16 singlechip.
Further, the singlechip is electrically connected with a 12864 liquid crystal display module.
Further, the adjustable pulse generator control circuit comprises a pulse width adjusting circuit and a pulse period adjusting circuit.
Compared with the prior art, the utility model discloses the high efficiency power amplifier that can test can also confirm to be put by test power and not steal the worker and subtract the material reduction cost and lead to influencing the sound performance under the music status, has improved the precision of software testing and the efficiency of software testing to high efficiency power amplifier.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a waveform of amplitude versus time for a piece of music;
FIG. 2 is a schematic diagram of the operation of the audio signal generator with continuously and substantially adjustable crest factor according to the present invention;
FIG. 3 is a schematic circuit diagram of the audio signal generator of the present invention with continuously adjustable crest factor;
FIG. 4 is the NE555 time base circuit of the audio signal generator of the utility model, which can continuously and greatly adjust the crest factor;
fig. 5 shows the schmitt trigger of the audio signal generator of the present invention, which can continuously and substantially adjust the crest factor.
In the figure: 1-a sine wave generator control circuit; 2-a voltage controlled amplifier control circuit; 3-adjustable pulse generator control circuit; 4-buffer amplifying output conversion control circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, which is a waveform of amplitude versus time of a piece of music, the time at which the maximum amplitude occurs is short.
As shown in fig. 2 the utility model discloses a but audio signal generator of continuous adjustable crest factor by a wide margin, including voltage-controlled amplifier control circuit 2 and respectively with the sine wave generator control circuit 1 that voltage-controlled amplifier control circuit 2 electricity is connected, adjustable impulse generator control circuit 3 and buffer amplification output transform control circuit 4, sine wave generator control circuit 1 generates the sine wave, the sine wave is sent voltage-controlled amplifier control circuit 2 and is enlargied, the audio pulse signal who is generated by adjustable impulse generator control circuit 3 changes voltage-controlled amplifier control circuit 2's magnification times, the audio pulse signal through voltage-controlled amplifier control circuit 2 processing is through buffer amplification output transform control circuit 3 output.
The voltage controlled amplifier control circuit 2 includes a variable gain amplifier, a span operational amplifier, or a multiplier. The variable gain amplifier, the span operational amplifier or the multiplier can realize the change of the amplification factor along with the voltage of the control end.
The voltage controlled amplifier control circuit 2 includes a pulse intensity adjusting circuit.
The sine wave generator control circuit 1 includes a venturi bridge circuit.
The sine wave generator control circuit 1 includes a signal frequency shift circuit and a signal frequency adjustment circuit.
The adjustable pulse generator control circuit 3 comprises a single chip microcomputer, a pulse width modulation chip capable of changing the frequency of a triangular wave, an NE555 time-base circuit or a Schmitt trigger. The single chip microcomputer, the pulse width modulation chip capable of changing the triangular wave frequency, the NE555 time base circuit or the Schmitt trigger can realize that the period and the duty ratio of the output pulse signal can be continuously and greatly adjusted.
The singlechip is MEGA16 singlechip.
The singlechip is electrically connected with a 12864 liquid crystal display module.
The adjustable pulse generator control circuit 3 includes a pulse width adjustment circuit and a pulse period adjustment circuit.
As a specific implementation manner, as shown in fig. 3, a sine wave generator control circuit 1 generates a sine wave, the sine wave generator control circuit 1 is implemented by a venturi bridge circuit, the frequency of the sine wave is required to be continuously and greatly adjustable, then the generated sine wave is sent to a voltage-controlled amplifier control circuit 2 with a sufficiently large dynamic range for amplification, the voltage-controlled amplifier control circuit 2 is implemented by a span operational amplifier, then an adjustable pulse generator control circuit 3 generates a pulse signal with a music rhythm similar to the music rhythm to change the amplification factor of the voltage-controlled amplifier control circuit 2, the adjustable pulse generator control circuit 3 is implemented by a MEGA16 single chip microcomputer, the period and duty cycle of the output pulse signal of the adjustable pulse generator control circuit 3 are both required to be continuously and greatly adjustable, the voltage-controlled amplifier control circuit 2 is an amplification control circuit which changes the amplification factor along with the voltage of a control end, and finally, the sine wave signals are output to a dragon or RCA socket through a buffer amplification output conversion control circuit 4, so that the music-like sine wave signals with adjustable period, duty ratio and strength ratio are obtained.
Of course, the adjustable pulse generator control circuit 3 can also be implemented by an NE555 time base circuit as shown in fig. 4, or by a schmitt trigger as shown in fig. 5.
Because the nominal output power of high efficiency power amplifier under its music state usually is far more big than its nominal power total input power, can lead to the power of the power amplifier of being tested not enough or trigger the overload protection of power amplifier with traditional continuous sine wave test mode, the utility model discloses can test high efficiency power amplifier precision higher, can also confirm that this work has not excessively utilized nominal output power and power total input power mark rule and steal the worker and subtract the material reduction cost and lead to influencing the sound performance under the music state.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An audio signal generator capable of continuously and substantially adjusting crest factor, comprising: the control circuit comprises a voltage-controlled amplifier control circuit, a sine wave generator control circuit, an adjustable pulse generator control circuit and a buffer amplification output conversion control circuit, wherein the sine wave generator control circuit generates sine waves which are sent to the voltage-controlled amplifier control circuit for amplification, an audio pulse signal generated by the adjustable pulse generator control circuit changes the amplification multiple of the voltage-controlled amplifier control circuit, and the audio pulse signal processed by the voltage-controlled amplifier control circuit is output by the buffer amplification output conversion control circuit.
2. The continuous wide-amplitude tunable crest factor audio signal generator according to claim 1, wherein: the voltage controlled amplifier control circuit comprises a variable gain amplifier, a span operational amplifier or a multiplier.
3. The continuous wide-amplitude tunable crest factor audio signal generator according to claim 1, wherein: the voltage controlled amplifier control circuit includes a pulse strength adjustment circuit.
4. The continuous wide-amplitude tunable crest factor audio signal generator according to claim 1, wherein: the sine wave generator control circuit comprises a Venturi bridge circuit.
5. The continuous wide-amplitude tunable crest factor audio signal generator according to claim 1, wherein: the sine wave generator control circuit comprises a signal frequency shifting circuit and a signal frequency adjusting circuit.
6. The continuous wide-amplitude tunable crest factor audio signal generator according to claim 1, wherein: the adjustable pulse generator control circuit comprises a single chip microcomputer, a pulse width modulation chip capable of changing triangular wave frequency, an NE555 time-base circuit or a Schmitt trigger.
7. The continuous wide-amplitude tunable crest factor audio signal generator of claim 6, wherein: the single chip microcomputer is an MEGA16 single chip microcomputer.
8. The continuous wide-amplitude tunable crest factor audio signal generator of claim 6, wherein: the singlechip is electrically connected with a 12864 liquid crystal display module.
9. The continuous wide-amplitude tunable crest factor audio signal generator according to claim 1, wherein: the adjustable pulse generator control circuit comprises a pulse width adjusting circuit and a pulse period adjusting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021024151.8U CN212909443U (en) | 2020-06-05 | 2020-06-05 | Audio signal generator capable of continuously and greatly adjusting crest factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021024151.8U CN212909443U (en) | 2020-06-05 | 2020-06-05 | Audio signal generator capable of continuously and greatly adjusting crest factor |
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| Publication Number | Publication Date |
|---|---|
| CN212909443U true CN212909443U (en) | 2021-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021024151.8U Active CN212909443U (en) | 2020-06-05 | 2020-06-05 | Audio signal generator capable of continuously and greatly adjusting crest factor |
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|---|---|
| CN (1) | CN212909443U (en) |
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- 2020-06-05 CN CN202021024151.8U patent/CN212909443U/en active Active
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