A 200 m linear array is used for receiving a 300 Hz signal. What is the directivity index?
Directivity index, DI = 10log (2L/λ)
DI = 10 log(400m/λ)
λ = 330 m/s /300 Hz = 1.1 m
DI = 10 log(400/1.1) = 25.6066
A 200 m linear array is used for receiving a 300 Hz signal. What is the...
Consider a message signal m(t) that contains frequency components at 100, 200, and 400 Hz. This signal is used to modulate a carrier at 100 kHz to obtain an SSB modulated signal. At the receiver, in the coherent detector is used to recover m(t), the oscillator supplies a sine wave of frequency 100.02 kHz instead of a cosine wave of frequency 100 kHz. (a) Determine the frequency components of the detector output if the SSB signal transmits the upper sideband....
Assume that an analog audio voice-frequency (VF) telephone signal m(t) occupies a band from 300 Hz to 3000 Hz. The signal is to be converted to a PCM signal for transmission over a digital telephone system. The signal is sampled at a rate 33.3% higher than the Nyquist rate. The maximum acceptable quantizatiorn error is 2% of the peak amplitude of m(t). The quantized samples are binary coded. Find the minimum bandwidth B of a noiseless channel required to transmit...
1-A speaker, which emits a 200-Hz signal is 8 m from a sound recorder. They are equidistant from a wall. What is the minimum distance to the wall such that the sound that reaches the recorder directly, and that which is reflected off the wall, interfere constructively. (Take zero phase change for displacement of sound on reflection) (2.74m]
Let m(t) = cos wmt denote the message signal to modulate with wm = 200 Hz. The carrier frequency is given by We = 100 Hz. You will perform modulation and demodulation of double sideband-suppresed carrier (DSB-SC). 1. Modulate m(t). (4 pts) Note: Denote the result of modulation as Smod(t). 2. Demodulate Smod(t). (6 pts) Note: Denote the result of modulation as Sdem(t). Note: To get full credits, strictly mark on m(t) recovered.
1. Identify the first five spectral images (frequency contents) of a 200 Hz signal sampled at 600 Hz. 2. An analog signal has a range of 15 V. If the quantization step must be no greater than 0.01V, how many bits must be used for A/D conversion? answer is 11 bits but explain
When a 300-MHz NMR spectrometer is used, one proton signal produced from a compound is 150 Hz higher than another signal. In a 90-MHz instrument, what would be the frequency difference between the two signals?
Consider a FM system that is used to communicate the following message signal: S. m(t) 20 0.05 0.1 015 10 -0.05 with a frequency deviation constant ky 10, and a message bandwidth of W =15 kHz the one-sided noise power-spectral density in the transmission channel is No= 10-8 W/Hz, and an attenuation of 10 is introduced during transmission in the channel as well. a. What is the average-to-peak-power ratio of the message (or, equivalently the power content of the normalized...
Consider a FM system that is used to communicate the following message signal: S. m(t) 20 0.05 0.1 015 10 -0.05 with a frequency deviation constant ky 10, and a message bandwidth of W =15 kHz the one-sided noise power-spectral density in the transmission channel is No= 10-8 W/Hz, and an attenuation of 10 is introduced during transmission in the channel as well. a. What is the average-to-peak-power ratio of the message (or, equivalently the power content of the normalized...
In a broadcasting system, the transmitted signal power is 50 kW, the attenuation of the signal is 155 dB (in passing from the input to the transmitting antenna to the output of the receiving antenna), and the available mean power-spectral density of the noise in the system from all sources has a mean power spectral density level 10-18 W/Hz (as if added at the receiving antenna's output). The bandwidth of the message signal m(t) is 8 KHz. Determine the output...
5. A signal contains the following frequencies, 100 Hz, 247 Hz, and 750 Hz. What is the Nyquist frequency of the signal? 6. If an 8-bit ADC accepts input voltage from -5V to 5 V, calculate: (a) number of quantization levels (b) resolution of ADC (c) quantized value of 2.5 V.