Base frequency shifting feedback controller

Abstract

The invention discloses a base frequency shifting feedback controller which comprises a very low frequency sinusoidal oscillator, a differentiating amplifier, a signal amplifier, an integrating amplifier and an accumulator, wherein the signal amplifier exports the input signals to the input end of the integrating amplifier and the y+1 input end of the multiplier (II), the integrating amplifier exports the signal produced through integration to the y+1 input end of the multiplier (I), while the multipliers (I, II) multiply the input signals and export to the input end of the summer for summing and exporting.

Description

Technical field: [0001] The invention relates to the field of audio control, in particular to a fundamental frequency shifting feedback controller. Background technique: [0002] At present, the existing products mostly use frequency equalizers and feedback controllers to control acoustic feedback. Feedback controllers are another form of equalizers. Strictly speaking, they are products of the same performance. The equalizer needs to be manually controlled, and the feedback controller relies on the CPU to automatically retrieve the frequency, so that the output frequency is too high for compression, but it still produces sudden acoustic feedback, which is very difficult to operate and the effect is not ideal. At present, the frequency shifter made by the domestic sideband modulation method has large frequency distortion, large noise and serious radio frequency interference. At the same time, it is also afraid of radio frequency interference, the passband is narrow, the uppe...

AI Technical Summary

Problems solved by technology

Until now, domestic manufacturers are still using the sideband modulation method. Its cost is low, but the distortion is large, it is difficult to repair, the effect is poor, and the high frequency is severely restricted. Due to the inherent shortcomings of the LC filter used, it is afraid of transportation and disorderly , once a problem occurs, it cannot be repaired

Foreign products are expensive and difficult to enter the majority of users. Moreover, these products also generate a lot of white noise, and the test results have not reached the expected indicators.

Images