Howling suppressor can automatically track the feedback point frequency, automatically adjusts the Q value of the bandwidth, but will automatically eliminate acoustic feedback to maximize the protection of the sound quality. The principle is through inhibition of Notch whistle. AD-303 analog FSK Module Description (howling suppressor) AD-303 is the company's research and development expertise to solve KTV size rooms easily whistle (acoustic feedback), guests singing difficult, small voice microphone can not open big, or because of package housing construction due to extremely poor acoustic environment and other issues whistle functional products. Recommend that you use 10 to 200 square meters in a variety of environments. The product performance meets or exceeds certain targets similar imported products, and the price advantage is obvious. And 32-band graphic equalizer ratio, increasing the digital frequency shift active anti-feedback circuit module, which makes the system gain skills to improve the balance on the basis of 3- 6DB. Especially after the recent customer feedback and researchers to improve the sound quality and the concert was more remarkable. 1, howling suppressor all with hardware circuit, no digital arithmetic circuit, so there is no delay between the output of the input signal. No AD and DA conversion, so there is no loss of audio detail. (DSP digital frequency shift will be delayed, Guang Xin DSP frequency shift operation using high-speed DSP chip, crystal clock reaches 83MHz, the delay only 3-5mS.) 2, requires a dual power supply. Is + 12V, -12V power supply. Or plus or minus 15V. Not suitable for single supply. (DSP digital frequency shift a single + 5V power supply, without the use of positive and negative power supply) 3, the circuit board with lots of adjustable resistance. Usually takes 3-5 adjustable resistor. Debugging is very complex. If one resistor improperly adjusted position, the effect will be greatly reduced. So customers do not adjust above the adjustable elements themselves. (DSP digital frequency-shift operations and rely on internal procedures to ensure the crystal clock frequency shift effect and stability, and peripheral resistance and capacitance of error is almost no relation) 4, above the howling suppressor circuit board with a lot of resistance, capacitance. And analog frequency shift circuit resistance, capacitance resistance, capacitance accuracy is very high. Requirements error is less than 1%. Otherwise, the state of the analog frequency shift circuit and consistency will be poor. This module above components are high precision, please customers do not find their element instead of up. (DSP digital frequency-shift operations and rely on internal procedures to ensure the crystal clock frequency shift effect and stability, and peripheral resistance and capacitance of error is almost no relation) 5, the analog frequency shift circuit uses an IC chip is mainly SOP14 and SOP16 and other logic circuit generates shock clock. And the op amp circuit with the modulation, demodulation, and so on. Module with DSP digital frequency shift characteristic difference is very obvious. (Guang Xin chip DSP digital frequency shift using digital frequency shift ASIC QFP60 package IC, very obvious characteristics. Oscillator frequency is 83MHz or 48MHz) In summary, the present analog frequency shift KTV KTV audio module is particularly suitable for high quality requirements the occasion. Because KTV Microphone is a dynamic microphone, the sensitivity is low, howling generally not very serious. Guangzhou Guang Xin Electronic Technology Co., Ltd. www.guangxin.cc Feedback Suppressor |?? echo cancellation | howling suppressor