Tel：0086-631-5626901
Fax：0086-631-5626903
Contact：Mr. Xing
E-mail：xxk737@163.com
Add：No.455,Shichang Road, Hi-tech Development Zone,Weihai,Shandong,China
Radio receiving system for receiving a high-frequency signal amplitude, then we must specifically provided in the receiving circuit for demodulating the signal amplitude-modulated high-frequency circuit. Means for demodulating amplitude-modulated high frequency signal from the modulation signal in a process known as demodulation, detection action is called complete detector.
AM signal has three basic forms: ordinary AM signal, double sideband signal and sideband signals. For ordinary AM signal, because it represents the envelope of the modulated signal waveform it, using an envelope detector can be seized to remove low-frequency signal transmitted by the sending end, namely amplitude detector, generally using a diode envelope detector; double-sideband amplitude modulated signal and single-sideband amplitude modulated signal waveform envelope and can not reflect the variation of the modulation signal can not be used envelope detector detectors, but should adopt synchronous detector detector.
Is multiplied by the synchronous detector and a low-pass filter, a synchronous detector prominent features: it is in addition to the input detection signals, and are required to generate a detection signal with frequency reference signal in phase with the voltage. This is the reference signal voltage to be generated at the receiver, to the carrier wave with the frequency modulation of the voltage of the transmitting side, the same phase, which is called "sync" detector origin.
Synchronous detector for AM, DSB and SSB AM signal demodulation, etc. are applicable.
Wherein the coefficients for the multiplication, the output voltage multiplied by the low-pass filter to filter out high frequency components of the output voltage of the low-pass filter, which is a single sideband signal from the high frequency, the sample taken original frequency modulated signal.
AM signal has three basic forms: ordinary AM signal, double sideband signal and sideband signals. For ordinary AM signal, because it represents the envelope of the modulated signal waveform it, using an envelope detector can be seized to remove low-frequency signal transmitted by the sending end, namely amplitude detector, generally using a diode envelope detector; double-sideband amplitude modulated signal and single-sideband amplitude modulated signal waveform envelope and can not reflect the variation of the modulation signal can not be used envelope detector detectors, but should adopt synchronous detector detector.
Is multiplied by the synchronous detector and a low-pass filter, a synchronous detector prominent features: it is in addition to the input detection signals, and are required to generate a detection signal with frequency reference signal in phase with the voltage. This is the reference signal voltage to be generated at the receiver, to the carrier wave with the frequency modulation of the voltage of the transmitting side, the same phase, which is called "sync" detector origin.
Synchronous detector for AM, DSB and SSB AM signal demodulation, etc. are applicable.
Wherein the coefficients for the multiplication, the output voltage multiplied by the low-pass filter to filter out high frequency components of the output voltage of the low-pass filter, which is a single sideband signal from the high frequency, the sample taken original frequency modulated signal.
- Previous：Sensor market prospects
- Next：Accelerometer
WEIHAI GRAND EXPLORATION INSTRUMENT CO.,LTD Main products are | Vibration sensor | Speedometer | DetectorWait
Site images and content network sources, belongs to original author or company, if you believe we have violated your copyright, pro-informed! We will delete it immediately.