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Digital audio tape (DAT) is magnetic recording tape on which binary digital data can be recorded. Digital recording provides better fidelity than analog recording. The difference between DAT and conventional analog audio tape is similar to the improvement afforded by the digital CD over the vinyl audio disk. In digital audio recording, tape noise is eliminated. This is because such noise is analog in nature, and is therefore ignored by digital sound reproduction equipment. Some electronic noise is generated in the analog amplification stages following D/A conversion, but this is minimal compared with the noise generated in older, fully analog systems. The reduced noise in DAT equipment provides more true-to-life reproduction than is possible with analog methods. Another advantage of DAT is virtually unlimited copiability. The reason for this is the same as the reason a computer can repeatedly read and overwrite data on a magnetic disk. On DAT, the impulses are well defined: high and low states (logic ones and zeros) are represented by distinct magnetized regions on the tape. While analog signals are fuzzy in the sense that they vary continuously, digital signals are crisp. Imperfections in the recording apparatus, the tape itself, and the pickup head affect digital signals less than they affect analog signals. Digital signal processing (DSP) can eliminate the minute flaws that creep into a digital signal each time it is recorded and played back. Thus, you can make copies of copies of DAT recordings, and the fidelity will not deteriorate to any noticeable extent even after dozens of generations.
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As hi-fi equipment becomes more sophisticated and complex, the circuits seem to be getting more susceptible to interference from outside sources. If a radio transmitter is operated near a stereo system, the radio signals can be intercepted by the hi-fi wiring and peripherals, and delivered to the amplifier. Unshielded interconnecting cables act as radio receiving antennas. This problem is exacerbated if any of the connecting cables happen to resonate at the operating frequency of the radio transmitter. In the amplifier, the RF currents are rectified, causing changes in the audio gain. Sometimes the signal data can be heard in the speakers or headset. This is known as electromagnetic interference (EMI). In most cases when EMI takes place in a hi-fi setup, the fault exists in the stereo system design, not in the radio transmitter. The transmitter system is doing its job: generating and radiating electromagnetic signals. There are several steps that can be taken when installing a stereo hi-fi system to minimize the likelihood that EMI will occur. These precautions should be followed: Connect the stereo amplifier chassis to a good electrical ground. Use shielded interconnecting cables as much as possible. Use shielded (coaxial) speaker cables. Keep all cables as short as possible.
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602 Acoustics, audio, and high fidelity If you have an amateur or citizens band (CB) radio station in your house and it causes EMI to your hi-fi system, two more steps might be necessary: Locate the radio transmitting antenna as far from the hi-fi equipment as possible. Use the lowest possible transmitter output power that will ensure reliable communications. If EMI problems continue even after all the above steps have been taken, a professional engineer might be able to help. If the radio transmitter is not always in use (a CB or amateur station, for example), efforts should be made to avoid using both the radio and the hi-fi at the same time.
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Refer to the text in this chapter if necessary. A good score is 18 correct. Answers are in the back of the book. 1. Acoustics is important in the design of: A. Amplifier power supplies. B. Speaker enclosures. C. Cables that connect components of a hi-fi system together. D. Graphic equalizers. 2. Electromagnetic interference to a hi-fi amplifier can be caused by: A. A nearby radio broadcast station. B. Improperly designed receiving antennas. C. Excessive utility voltage. D. Improper balance between the left and right channels. 3. The midrange audio frequencies: A. Are halfway between the lowest and highest audible frequencies. B. Represent sounds whose volume levels are not too loud or too soft. C. Are above the treble range but below the bass range. D. Are between approximately 0.2 and 2 kHz. 4. An indoor concert hall such that sound reaches every listener s ears perfectly at all audio frequencies requires: A. A suspended ceiling with acoustical tile completely covering it. B. Numerous baffles on the walls and ceiling. C. A level of engineering beyond reasonable expectation. D. Avoidance of excessive background noise. 5. A sound volume change of 3 dB represents: A. A doubling of acoustic power. B. A threefold increase in acoustic power.
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Quiz 603 C. A tenfold increase in acoustic power. D. No change in acoustic power. 6. A sound whose wavelength is 6 in in the air has a frequency of: A. 550 Hz. B. 1100 Hz. C. 2200 Hz. D. It is impossible to calculate from this information. 7. A sound wave that travels at 335 m per second has a frequency of: A. 335 Hz. B. 3350 Hz. C. 33.5 Hz. D. It is impossible to calculate from this information. 8. The relative phase of two acoustic waves, as they arrive at your ears, can affect: A. How loud the sound seems. B. The direction from which the sound seems to be coming. C. Both A and B. D. Neither A nor B. 9. In an acoustic sine wave: A. The frequency and phase are identical. B. The sound power is inversely proportional to the frequency. C. The sound power is directly proportional to the frequency. D. All of the sound power is concentrated at a single frequency. 10. Vinyl disks are: A. Susceptible to physical damage. B. Useful primarily in high-power sound systems. C. Digital media. D. Preferred for off-the-air sound recording. 11. If an amplifier introduces severe distortion in the waveforms of input signals, then that amplifier is: A. Not delivering enough power. B. Operating at the wrong frequency. C. Operating in a nonlinear fashion. D. Being underdriven. 12. If a 10-watt amplifier is used with speakers designed for a 100-watt amplifier: A. The speakers are capable of handling the amplifier output. B. The amplifier might be damaged by the speakers.
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604 Acoustics, audio, and high fidelity C. Electromagnetic interference is likely to occur. D. The speakers are likely to produce distortion of the sound. 13. Which of the following frequencies cannot be received by an AM/FM tuner A. 830 kHz. B. 95.7 kHz. C. 100.1 MHz. D. 107.3 MHz. 14. A woofer: A. Is especially useful for reproducing the sounds of barking dogs. B. Is designed to handle short, intense bursts of sound. C. Should not be used with a graphic equalizer. D. Is designed to reproduce low-frequency sounds. 15. Suppose you have an amateur radio station and its transmitter causes EMI to your hi-fi system. Which of the following would almost certainly not help A. Buy a radio transmitter that works on the same frequencies with the same power output, but is made by a different manufacturer. B. Reduce the transmitter output power. C. Use shielded speaker wires in the hi-fi system. D. Move the radio transmitting antenna to a location farther away from the hifi system. 16. A tape recording head: A. Converts sound waves to radio signals. B. Converts sound waves to fluctuating electric current. C. Converts audio-frequency currents to a fluctuating magnetic field. D. Converts direct current to audio-frequency currents. 17. A microphone: A. Converts sound waves to radio signals. B. Converts sound waves to fluctuating electric current. C. Converts audio-frequency currents to a fluctuating magnetic field. D. Converts direct current to audio-frequency currents. 18. An audio mixer: A. Cannot match impedances. B. Cannot make an amplifier more powerful. C. Will eliminate EMI. D. Allows a microphone to be used as a speaker.
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Quiz 605 19. Which of the following media or devices use digital-to-analog conversion A. A CD player. B. A speaker. C. A microphone. D. A vinyl disk. 20. Phase quadrature is sometimes used to: A. Increase the output from a microphone. B. Reduce the susceptibility of a hi-fi system to EMI. C. Create the illusion of four-channel stereo when there are really only two channels. D. Convert an analog signal to a digital signal, or vice-versa.
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