- 1 What is meant by threshold effect?
- 2 What is threshold effect in communication system?
- 3 What is threshold effect in angle modulation?
- 4 What is threshold effect in AM receiver?
- 5 What is the threshold effect in advertising?
- 6 Why is threshold voltage important?
- 7 What is the relationship between modulation frequency and threshold?
- 8 What is threshold effect and capture effect?
- 9 How pre emphasis and de emphasis can improve the threshold?
- 10 Why pre emphasis is done after modulation?
- 11 How limiting reduces the effect of noise on FM signals?
- 12 What do you mean by pulse modulation?
- 13 What is threshold in communication?
- 14 Which is the true statement about noise performance of wideband FM system?
- 15 What is the role of amplitude limiter in FM receiver?
What is meant by threshold effect?
an effect in a dependent variable that does not occur until a certain level, or threshold, is reached in an independent variable. For example, a drug may have no effect at all until a certain dosage level (the threshold value) is reached.
What is threshold effect in communication system?
This phenomenon is known as the threshold effect.The threshold effect is defined as the minimum carrier to noise ratio that gives the output SNR not less than the value predicted by the usual signal to noise formula assuming a small noise power.
What is threshold effect in angle modulation?
The threshold effect is first noticed when the input signal – to – noise ratio reaches the vicinity of unity . If the input Signal-to-Noise Ratio (SNR) falls below this threshold point, then the Demodulation Gain (D.G) becomes smaller, where D.G is given by: (So / No) / (Si / Ni) .
What is threshold effect in AM receiver?
When the value of the input signal to noise ratio falls below a particular value (called Threshold value), a rapid fall of the output signal to noise ratio is observed by the receiver. The threshold effect occurs due to the presence of large noise in the modulated signal.
What is the threshold effect in advertising?
In advertising, the threshold effect refers to the notion that our efforts require concentration. If you spent a hundred thousand dollars in national advertising, you can predict that the effect will be inconsequential. If you spent that same budget in your local community, you might very well own the market.
Why is threshold voltage important?
One of the most important physical parameters of a MOSFET is its threshold voltage V th, defined as the gate voltage at which the device starts to turn on. The accurate modeling of threshold voltage is important to predict correct circuit behavior from a circuit simulator.
What is the relationship between modulation frequency and threshold?
In a frequency-modulated (FM) receiver, a change in the value of the FM improvement threshold, which may be obtained by decreasing the operational bandwidth, thus decreasing the received noise power and allowing the threshold of the desired signal to occur at a lower signal input level.
What is threshold effect and capture effect?
In a radio receiver, the capture effect, or FM capture effect, is a phenomenon associated with FM reception in which only the stronger of two signals at, or near, the same frequency or channel will be demodulated.
How pre emphasis and de emphasis can improve the threshold?
This pre-emphasis circuit increases the energy content of the higher-frequency signals so that they will tend to become stronger than the high frequency noise components. This improves the signal to noise ratio and increases intelligibility and fidelity.
Why pre emphasis is done after modulation?
Pre emphasis is done Pre-emphasis is done for boosting the relative amplitudes of the modulating voltages at higher audio frequencies. As higher frequency signals are more prone to noise, the boosting of signals is done to avoid noise.
How limiting reduces the effect of noise on FM signals?
Explain how limiting reduces the effect of noise on FM signals. The noise amplitude is easily handled in FM system. Because the detection of FM signals are independent on shape of an envelope. Hence the receiver uses limiting to eliminate variations in amplitude of the signal.
What do you mean by pulse modulation?
Pulse modulation is a type of modulation in which the signal is transmitted in the form of pulses. It can be used to transmit analogue information. In pulse modulation, continuous signals are sampled at regular intervals.
What is threshold in communication?
a signal at the input of a receiving device; its magnitude is the minimum that provides the required probability of registering a signal for a specified probability level of false registration, or operation caused by noise.
Which is the true statement about noise performance of wideband FM system?
3. Which is the true statement about noise performance of wideband FM system? Explanation: Noise performance of wideband FM system exhibits a threshold. 4.
What is the role of amplitude limiter in FM receiver?
In FM receiver, role of amplitude limiter is to amplify low frequency signals. Explanation: Amplitude Limiter circuit is used in FM receiver to remove the noise or any variation in amplitude present in the received signal.