Audio signal generator capable of continuously and substantially adjusting crest factor
A crest factor and audio signal technology, which is applied in the field of audio signal generators with continuously adjustable crest factor, can solve problems such as power shortage and power amplifier overheat protection, and achieve the effect of improving test accuracy and test efficiency
Pending Publication Date: 2020-09-01
恩平灵特电子科技有限公司
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Problems solved by technology
At this time, if the traditional continuous sine wave test method is used again, the power of the power amplifier under test will be insufficient or the overload protection of the power amplifier will be triggered. If the time is longer, it will even cause the overheating protection of the power amplifier.
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[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0024] Such as figure 1 Shown is a waveform diagram of amplitude versus time for a piece of music, with the maximum amplitude occurring for a short time.
[0025] Such as figure 2 An audio signal generator that can continuously and greatly adjust the crest factor of the present invention includes a voltage-controlled amplifier control circuit 2 and a sine wave generator control circuit 1 electrically connected to the voltage-controlled amplifie...
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The invention discloses an audio signal generator capable of continuously and substantially adjusting a crest factor. The audio signal generator comprises a voltage-controlled amplifier control circuit, and a sine wave generator control circuit, an adjustable pulse generator control circuit and a buffer amplification output conversion control circuit electrically connected with the voltage-controlled amplifier control circuit. The sine wave generator control circuit generates sine waves; the sine wave is sent to the voltage-controlled amplifier control circuit to be amplified, the amplification factor of the voltage-controlled amplifier control circuit is changed through an audio pulse signal generated by the adjustable pulse generator control circuit, and the audio pulse signal processedby the voltage-controlled amplifier control circuit is output through the buffer amplification output conversion control circuit. According to the invention, an audio test signal with a greatly adjustable crest factor can be generated, and the working quality of the high-efficiency power amplifier can be conveniently tested.
Description
technical field [0001] The invention relates to an audio signal generator, in particular to an audio signal generator which can continuously and greatly adjust the crest factor. Background technique [0002] Music has obvious rhythmic ups and downs, so the instantaneous output power of audio power amplifiers (referred to as power amplifiers) changes drastically from time to time. Such as figure 1 Shown is the waveform of the amplitude and time of a piece of music, and it can be seen that the maximum amplitude occurs for a short time. [0003] In the scientific community, the ratio of the peak value of a waveform to the effective value is called the crest factor, and the crest factor of a typical music signal is 3 to 10; this shows that the power amplifier needs more than ten times the power reserve. In other words: a power amplifier with a maximum output power of 1500 watts is in the working state of an output power of 150 watts to 500 watts most of the working time, so ma...
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IPC IPC(8): H03F3/20
CPCH03F3/20
Inventor 王国坚
Owner 恩平灵特电子科技有限公司