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Magnetic tape is unique in consumer audio because it conveniently allows consumers to record, as well as play back, hi-fi sound. (CD burners exist, but they are expensive compared to tape recorders.) Any form of private recording or reproduction can give rise to copyright infringement concerns. If you re in doubt about the legality of making a tape recording of anything, consult a lawyer before you do it. Tape recorders can be classified as either cassette or reel-to-reel. In the past several decades, cassette tape has gradually replaced reel-to-reel tape in consumer applications. Reel-to-reel tape is still used in some professional settings. Magnetic-tape cassettes come in a variety of sizes and shapes for various applications. A typical audio cassette plays for 30 minutes on each side; longer-playing cassettes allow recording for as much as 60 minutes per side. The longer tapes are thinner and more subject to stretching than the shorter tapes. Some cassettes, such as the kind used in stereo tape players, have endless loops of tape. Four recording paths, each with two channels for the left and the right half of the sound track, provide a total of eight recording tracks. A reel-to-reel tape feed system resembles that of an old-fashioned movie projector. The tape is wound on two flat spools called the supply reel and the take-up reel. The
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600 Acoustics, audio, and high fidelity supply reel is usually on the left, and the take-up reel is on the right. The reels rotate counterclockwise as the tape passes through the recording/playback mechanism. When the take-up reel is full and the supply reel is empty, both reels can be flipped over and interchanged. This allows recording or playback on the other side of the tape. (Actually, the process takes place on the same side of the tape, but on different tracks.) A 7inch-diameter reel can hold about 3000 ft of 0.5-mil-thick tape. The speed is usually 1.875, 3.75, or 7.5 in per second (IPS). At the slowest speed, the tape can run for several hours on each side. All tape recorders work the same way, acting as transducers between acoustic, digital, or video signals and variable magnetic fields. Figure 31-9 is a simplified rendition of the recording/playback apparatus in a typical audio tape recorder. The same basic scheme is used in cassette machines and reel-to-reel machines.
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31-9 Simplified diagram of an analog audio tape recorder.
In the record mode, the tape moves past the erase head before anything is recorded on it. If the tape is not blank (that is, if magnetic impulses already exist on it), the erase head removes these before anything else is recorded. This prevents doubling, or the simultaneous presence of two programs on the tape. The erase head can be disabled in some tape recorders when doubling is wanted. This is sometimes done, for example, in audio recording studios. The recording head is a miniature, precision electromagnet that generates a fluctuating magnetic field whose instantaneous flux density is proportional to the instantaneous level of the audio input signal. This magnetizes the tape in a pattern that duplicates the waveform of the signal. The playback head is usually not activated in the record mode. However, the playback head and circuits can be used while recording to create an echo effect. In the playback mode, the erase head and recording head are not activated. The playback head acts as a sensitive magnetic-field detector, something like a miniature low-frequency radio antenna. As the tape moves past this device, the playback head is exposed to a fluctuating magnetic field whose waveform is identical to that produced by
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Electromagnetic interference 601 the recording head when the audio was originally recorded on the tape. This magnetic field induces weak alternating currents in the playback head. These currents are amplified and delivered to a speaker, headset, or other output device.
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