46results about How to "Implement Automatic Gain Control" patented technology

The invention discloses a realization method and a realization system for automatic gain control. The realization method comprises the following steps that the threshold value of an audio dynamic range control module are set; the audio dynamic range control module is used to receive and detect the amplitude of decoded audio signals and to compare the amplitude with the threshold value; if the amplitude is larger than the threshold value, the gain of the audio dynamic range control module is attenuated and corresponding audio signals are output according to the attenuated gain; and if the amplitude is not larger than the threshold value, corresponding audio signals are output by the audio dynamic range control module according to the normal gain. The invention has the advantages that the realization of the method for the automatic gain control is simple, the automatic gain control performance is reliable and the realization cost is low.

The invention discloses a multi-path data acquiring system based on FPGA, which mainly solves the problems of small signal acquiring range and poor acquiring precision of the prior multi-path acquiring system. The multi-path data acquiring system comprises a multi-path selector, a programmable-gain amplifier, an AD converter and an FPGA data processing module, wherein the FPGA data processing module sends an address signal to the multi-path selector and also sends a magnification signal to the programmable-gain amplifier; the multi-path selector selects an external analog signal according to the address signal to enter the programmable-gain amplifier; after amplifying the input analog signal, the programmable-gain amplifier outputs the analog signal to the AD converter; the AD converter samples the input analog signal, quantifies the analog signal to form a digital signal and transmits the digital signal to the FPGA data processing module; and the FPGA data processing module transmits the input data to a host computer after sequencing, wave filtering and table searching. The invention has the advantages of wide signal acquisition range, high precision can convenient acquisition path expansion, thereby being suitable for the signal acquisition of an industrial monitoring and sensing network.

The invention discloses an automatic gain control method and device, which are used for resolving the problem that the conventional automatic gain control method may lead to in-band amplitude distortion and greatly reduce the function of a Bluetooth device. The method comprises the steps of measuring the RSSI value of a data frame; determining whether the actual power of the data frame is within alinear zone of curve relationship between the actual power and the measuring power or not based on the RSSI value of the data frame; adjusting the receiving gain of the data frame based on the judging result. The invention is advantageous in that the device can work at the best gain point, and the receiving sensitivity and anti-interference performance can be bettered.

The invention discloses a method for controlling an automatic gain and dynamic range of a voice based on a sliding gain. The method comprises the following steps: setting a gain array which comprises a plurality of gain values arranged according to a number order and a plurality of indexes arranged according to the number order, wherein each index points to a gain value correspondingly; after receiving current frame voice data, searching the maximum value of signal amplitude in voice data which contains the current frame voice data in a time length of recent S seconds, and searching a current optimal gain value in the gain array according to the maximum value; and controlling the sliding gain of the voice and the dynamic range thereof by using the current optimal gain value. The method has small calculation amount, reduces the burden of a terminal computer and is easy to implement on a DSP chip.

The invention discloses an intelligent obstacle avoiding and positioning system for a floor sweeping robot, and the system comprises a housing, an infrared light transmitting module, an infrared light transmission lens group, an infrared light receiving lens group, an optical signal processing unit, a wireless signal transmission module, a single-phase DC motor, a fixed-ratio parallel shaft gear case, a sliding ring, and corresponding drive circuits. The system is compact in structure, can accurately and specifically recognize the distance of an obstacle and judge the size of the obstacle, and provides reliable physical basis for the intelligent judgment of the floor sweeping robot.

The invention belongs to the technical field of image display processing and particularly relates to an automatic gain control display method for a floating point image. According to the method, automatic control of output gains of infrared floating point images of different scenes is realized, floating point image expression is enhanced, and the automatic gain control problem of the floating point image is solved.

This invention provides a controllable gain transducer based on a multiplication D/A converter including multiplication D/A converter2, base frequency and gain code generating circuit 6, frequency-selective circuit 3, D/A converter 4 and signal processor 5, in which, a signal received by a receiver is changed to signal 1 with a carrier frequency and envolope information after pre-amplification and filter circuit, which is input from the voltage reference end of 2 and through frequyency-selective circuit 3 to get a necessary base frequency signal to be input into D/A converter 4 to be collected and processed by signal processor 5 to be input into the base frequency and gain code generation circuit, the output of which is input into the multiplication D/A comverter2, which combines traditional mutual independent frequency conversion and gain control circuit modules by the multiplication function of a multiplication D/A converter to increase flexibility and adaptive ability of the system.

The invention discloses an automatic gain control receiving component, comprising: an intermediate frequency amplifier A (1), a voltage controlled attenuator (2), an intermediate frequency amplifier B(3), a power divider (4), a video amplifier (6), and a low-pass filter (9), an error voltage integrator (10), an amplitude detector (5), a pulse width expanding circuit (7), and a peak detector (8).By using the amplitude detector (5), the pulse width expanding circuit (7) and the peak detector (8) in an automatic gain control loop, the automatic gain control receiving component achieves the automatic gain control of pulse modulated signal reception, especially narrow pulse modulation signal reception.

The invention belongs to the technical field of integrated circuits, and particularly relates to a variable gain amplifier circuit which can be applied to a high-speed serial interface receiving end analog front-end circuit, provide multi-gear uniform adjustable gain within an input signal frequency range, ensure the linearity of received signals and improve the quality of the received signals. According to the circuit, a source end degenerate resistor array RCELL, a first load capacitor array CAPCELL1 and a second load capacitor array CAPCELL2 are controlled at the same time, a zero point introduced by a source end degenerate resistor and a pole introduced by a load capacitor array are counteracted, and peaking of a gain curve is avoided; 2N-gear gain is selected through N-bit control signals, a signal amplitude detection circuit and a digital control circuit are used in cooperation, and automatic gain control can be achieved according to the amplitude of input signals.

The invention discloses a processing method of nuclear-grade canned motor pump rotation speed signals. The processing method comprises the following steps that: 1) inputted nuclear-grade canned motor pump rotation speed signals are subjected to the transient voltage suppression and electrostatic protection of a protection circuit; 2) the inputted rotation speed signals are subjected to the filtering processing of a bandwidth filtering circuit; 3) after being filtered, the inputted rotation speed signals are classified according to peak values through a rotation speed pulse classification circuit, and the rotation speed signals are subjected to multistage amplification according to different classifications; 4) the amplified rotation speed signals are shaped so as to form unipolar square wave signals, and the unipolar square wave signals are sent to a core processing unit; and 5) the core processing unit sends a rotation speed value to a bus module, and the bus module processes the rotation speed value and realizes bus type output. With the processing method adopted, the rotation speed signals can be amplified according to the peak values, and signal amplification adopts a multistage small-multiple amplification scheme, and therefore, distortion in a pulse amplification process can be decreased.