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It has been suggested that this article was merged into the demodulation. (Discuss)
The modulation techniques
Analog Modulation
AM SSB FM PM SM
Digital Modulation
OOK FSK ASK PSK QAMMSK CPM PPM TCM OFDM
Spread Spectrum
v? DSSS eFHSS d?
See also: Demodulation
A detector is a device that retrieves the relevant information contained in a modulated wave. The term dates from the early days when all Radio transmissions were in Morse code, and it was only necessary to detect the presence (or absence) of a radio wave with a device as a coherer without necessarily what is heard.
Amplitude modulation detectors
Envelope detector
An important technique is known that the envelope detection. The simplest form of envelope detector is the detector diode, which consists of a diode connected between input and output circuit with a resistor and a capacitor in parallel circuit output to ground. If the version of the resistor and capacitor is selected, the output of this circuit will approximate the displacement voltage signal original.
An early form of envelope detector was cat's whiskers, which was used in the crystal set radio receiver.
Product Detector
A product detector is a receiver type used for AM and SSB signals. Rather than converting the envelope signal in the decoded waveform like an envelope detector, the detector product is the product of the modulated signal and local oscillator, hence the name. This can be achieved by heterodyning. The received signal is mixed a type of non-linear device with a local oscillator signal to produce an intermediate frequency, which refers to the beat frequency heart that the modulating signal detected and corrected.
Frequency modulation and phase detectors
Sensors can demodulate AM signals FM and AM because both have a constant amplitude. However, an AM radio can detect the sound of FM broadcasting by the phenomenon of slope detection occurs when the radio is somewhat tuned above or below the nominal transmission frequency. Frequency variation of a slope near radio tuning the amplified signal gives the corresponding amplitude of local variations, in which the AM detector is sensitive. Detection of the slope gives less distortion and noise rejection in comparison with the following dedicated FM detectors are commonly used.
Phase detection
A detector phase is a non-linear device whose output represents the phase difference between the two oscillating input signals. It has two entrances and output: a reference signal is applied to one input and phase or frequency modulated signal is applied to another. The output is a signal that is proportional to the phase difference between two entries.
In the phase demodulation of the information is contained in quantity and type of phase shift of the carrier wave.
The Foster-Seeley discriminator
The Foster-Seeley discriminator is an FM detector widely used. The detector consists of a special center tapped transformer feeding two diodes in a full wave rectifier circuit DC. When the input transformer is set to the frequency signal discriminator output is zero. When no deviation from the company, the two halves center operated transformer are balanced. As the FM signal frequency above and below the carrier frequency, the balance between the two halves center operated are destroyed and there is an output voltage proportional to the frequency deviation.
Ratio Detector
The relationship detectors variant the Foster-Seeley discriminator, but a diode driven in the opposite direction. The output in this case is caught between the amount of voltage diode and the center tap. The output through the diodes is connected to a capacitor value, which eliminates AM noise in the relationship of the detector output. Although different from the Foster-Seeley discriminator, ratio detector does not respond to signals in the same way AM, however, the output is only 50% of the production of a discriminator of the same input signal.
Quadrature Detector
In the quadrature detector, receiving the FM signal is divided into two signals. One of the two signals is passed through a high-reactance capacitor, which changes the signal phase by 90 degrees. This phase-shifted signal is applied to an LC circuit, resonant the FM signal and unmodulated ,…( etc.) For more information, visit some of the products Sensor of air temperature, the tractor electronic distributor. Products GN Nylon filter efficiency of mesh for primary education should show more here!

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