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NATS 1720.06
Laboratory Report #3
Superposition & Interference of Sound Waves
Name:
Student #
Section & Station #
Date:
Peer 1:
Peer 2:
Peer 3:
Part 1 – Two-Source Interference
Speakers to “T” line (S) in meters: Speakers to centre line (D) in meters: Station’s assigned frequency (Hz): Use the table below to record the positions of amplitude maxima and minima when the microphone is moved away from the centre line towards the edge of the table. Distance (M) is measured from the centre line.
Table 1 – Positions of Amplitude Max/Min
Distance (m)
Amplitude (Scope units)
Max or Min
Describe any challenges encountered in obtaining this data.
Questions
:
At what location do you expect the signal detected by the microphone to be largest, and why? Did you observe this? How can reflections from the tabletop or the back wall mess-up detection of the expected two-source interference pattern?
Part 2 – Fourier Spectrum
Chosen instrument recordings: , , .
Describe the key visible differences between the Fourier spectra of the recordings. And comment briefly on the audible differences between the timbre of the sounds.
Table 2 – Fourier Spectrum Peaks for .
Frequency (Hz)
Amplitude (dB)
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Part 3 – Sound Synthesis
Smallest amplitude from Part 2 (eg. 53.1 dB): Offset = smallest amplitude – 36 dB = Table 3 – Track Amplitudes
Track Frequency (Hz)
Spectrum Amplitude (dB)
(from Table 2)
Track Amplitude (dB)
Observations – Consistency of synthetic sound with original recording. Observations – Changes in sound with each added track. (Time-permitting)
Questions
:
What aspects of the original sound are missing from the synthetic reproduction?
What effects do you think could/should be added to the tracks to further improve the faithfulness of the reproduction?
How many pure tone tracks are needed before the synthetic sound is sufficiently like the original recording? (Time-permitting)
Related Questions
The period of this signal is about------ ms (milliseconds).
The oscilloscope range selector determines the scale on the screen. That means number of volts per line for amplitude vertical (v/div) and the number of milliseconds per line for time horizontally (ms/div).
arrow_forward
An RG-11/U foam coaxial cable has a maximum voltage standing wave of 52v and a maximum voltage 17v. Find (a) the SWR, (b) the reflection coefficient, and (c)the value of a resistive load. (d)What is the output power?(disregard attenuation due to length).
SOLVE ONLY THE (D) WHAT IS THE OUTPUT POWER
arrow_forward
A 2 V signal is incident to the interface from a 75 Ohm region propagating to a 50 Ohm impedance region. What is the reflection coefficient? What is value of the incident, reflected and transmitted wave? What voltage would you measure on either side of the interface right after the signal goes through the interface.
arrow_forward
A 2 V signal is incident to the interface from a 75 Ohm region propagating to a 50 Ohm impedance region. What is the reflection coefficient? What is value of the incident, reflected and transmitted wave? What voltage would you measure on either side of the interface right after the signal goes through the interface.
For the interface, I'm a little confused. I used a voltage divider and got V_transmitted = 0.8 and V_incident = 1.2. But shouldn't they be the same?
arrow_forward
answer the following question. topic: oscilloscope
1. What is/are the function of the horizontal sensitivity (TIME/DIV)?
2.What is/are the function of the vertical sensitivity (V/DIV)?
3.. What are the functions of Oscilloscope? Function Generator?
arrow_forward
Suppose a manufacturing error occurred and the oven was made 6.0 cm longer than specified in part (a). In this case, what would
have to be the frequency of the microwaves for there still to be five antinodal planes of the electric field along the width of the oven?
arrow_forward
What parts of the varactor act as the plates of a capacitor?
How does capacitance vary with applied voltage?
Do varactors operate with forward or reverse bias?
What is the main reason why LC oscillators are not used in transmitters today?
Can the most widely used type of carrier oscillator be frequency-modulated by a varactor?
What is the main advantage of using a phase modulator rather than a direct frequency modulator?
What is the term for frequency modulation produced by PM?
What is the most basic FM detector circuit?
What circuit compensates for the greater frequency deviation at the higher modulating signal
frequencies?
What two IC demodulators use the concept of averaging pulses in a low-pass filter to recover the
original modulating signal?
Which is probably the best FM demodulator of all those discussed in this module?
What is a capture range? What is a lock range?
What frequency does the VCO assume when the input is outside the capture range?
What type of circuit does a PLL…
arrow_forward
An FM signal has a frequency deviation of 8 kHz and a modulating frequency of 1.2 kHz. The signal-to-noise ratio at the input to the receiver detector is 19.4 dB. Calculate the approximate signal-to-noise ratio (in dB) at the detector output.
A sine wave of frequency 7 kHz phase modulates a carrier at 22 MHz. The peak phase deviation is 1 rad. Calculate the maximum frequency deviation in Hz.
A phase modulation system operates with a modulation index of 2. What is the maximum phase shift in degrees?
arrow_forward
Explain what will be seen on a synchroscope, when the frequency of the incoming source is higher than the operating source...
please briefly describeeee
arrow_forward
Modern digital spectra are represented by graphing
a.
velocity vs. time.
b.
intensity vs. wavelength.
c.
temperature vs. luminosity.
d.
luminosity vs. time.
e.
none of these.
arrow_forward
A _________ sine wave is not useful in data communications; we need to send a _______ signal.
a.
composite; single-frequency
b.
single-frequency; composite
c.
single-frequency; double-frequency
d.
none of the above
arrow_forward
(B) A commercial 50 92 Radio Shake coaxial cable is used to carry RF signal power from a
transmitter to an antenna of 300 2 as a load through flat antenna transmission line with 300 2
characterstic impedance as shown in Figure 3. The above situation would happen if we connect the
coaxial cable to the antenna without a matching techinque. Determine:
1- The reflection coefficient at junction B.
2- The input impedance at point A.
3- The reflection coefficient at junction A.
4- The fraction of the reflected power.
5- The fraction of the transmitted power to the antenna.
1²=0
5052
30052
(B)
Z₁ = 30052
Figure 3
arrow_forward
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- The period of this signal is about------ ms (milliseconds). The oscilloscope range selector determines the scale on the screen. That means number of volts per line for amplitude vertical (v/div) and the number of milliseconds per line for time horizontally (ms/div).arrow_forwardAn RG-11/U foam coaxial cable has a maximum voltage standing wave of 52v and a maximum voltage 17v. Find (a) the SWR, (b) the reflection coefficient, and (c)the value of a resistive load. (d)What is the output power?(disregard attenuation due to length). SOLVE ONLY THE (D) WHAT IS THE OUTPUT POWERarrow_forwardA 2 V signal is incident to the interface from a 75 Ohm region propagating to a 50 Ohm impedance region. What is the reflection coefficient? What is value of the incident, reflected and transmitted wave? What voltage would you measure on either side of the interface right after the signal goes through the interface.arrow_forward
- A 2 V signal is incident to the interface from a 75 Ohm region propagating to a 50 Ohm impedance region. What is the reflection coefficient? What is value of the incident, reflected and transmitted wave? What voltage would you measure on either side of the interface right after the signal goes through the interface. For the interface, I'm a little confused. I used a voltage divider and got V_transmitted = 0.8 and V_incident = 1.2. But shouldn't they be the same?arrow_forwardanswer the following question. topic: oscilloscope 1. What is/are the function of the horizontal sensitivity (TIME/DIV)? 2.What is/are the function of the vertical sensitivity (V/DIV)? 3.. What are the functions of Oscilloscope? Function Generator?arrow_forwardSuppose a manufacturing error occurred and the oven was made 6.0 cm longer than specified in part (a). In this case, what would have to be the frequency of the microwaves for there still to be five antinodal planes of the electric field along the width of the oven?arrow_forward
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- Modern digital spectra are represented by graphing a. velocity vs. time. b. intensity vs. wavelength. c. temperature vs. luminosity. d. luminosity vs. time. e. none of these.arrow_forwardA _________ sine wave is not useful in data communications; we need to send a _______ signal. a. composite; single-frequency b. single-frequency; composite c. single-frequency; double-frequency d. none of the abovearrow_forward(B) A commercial 50 92 Radio Shake coaxial cable is used to carry RF signal power from a transmitter to an antenna of 300 2 as a load through flat antenna transmission line with 300 2 characterstic impedance as shown in Figure 3. The above situation would happen if we connect the coaxial cable to the antenna without a matching techinque. Determine: 1- The reflection coefficient at junction B. 2- The input impedance at point A. 3- The reflection coefficient at junction A. 4- The fraction of the reflected power. 5- The fraction of the transmitted power to the antenna. 1²=0 5052 30052 (B) Z₁ = 30052 Figure 3arrow_forward
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