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Other so-called noise reduction systems operate by filtering out a portion of the high frequency spectrum during playback, some loss of the audio spectrum is thus inevitable. The Dolby principle is to reduce the noise amplitude in relation to the desired signal strength, thus there is no filtering action through the circuit used for the recording/playback process. The original program material is reproduced unchanged, only the noise and hiss are effected.

The Dolby System will not eliminate noise present in the original program source, it does reduce or completely eliminate the inherent tape hiss and any noises normally added during the recording or dubbing process.

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They may be used with virtually any tape recorder. They may be easily connected to your existing audio center. No complicated wiring or operating skill is required. Remarkably easy to operate, only a simple calibration is required upon initial installation.

The TEAC GSL (Superior Sound/Low Noise) tape decks incorporate many features designed to fully utilize low noise tapes, features such as dual level bias, expanded scale VU meters, meter level switches, high density ferrite heads and low noise preamplifiers. These decks in combination with a TEAC noise reduction unit will provide the ultimate in low noise, stereo home tape recording.

There are no restrictions on the type of tape that may be used. The Dolby process is equally effective with conventional, chromium dioxide, low noise/high output or high energy tape.
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Several design factors such as slow tape speed, closely spaced narrow tracks and an extremely thin oxide coating have made noise and hiss a major problem in cassette recordings. It is here that the most dramatic improvement will be noted. For the first time, true open reel quality can be obtained with a cassette recorder.

• Anmerkung : Das ist natürlich genau der Unsinn, auf den so viele reingefallen waren. Selbst mit DOLBY - egal ewelche Variante - hatte man auch mit den teuersten Cassettenrecordern nie die "open-reel" Qualität. Das schmale Band mit den schmalen Spuren und der niedrigen Geschwindigkeit gab es ja gar nicht her.

Also many prerecorded cassettes are now being Dolby encoded. In fact some major recording companies such as London Records and CBS are producing only Dolby encoded cassettes. As a result overall cassette quality has increased and the prices to the consumer are being reduced. Even though you may record infrequently you will enjoy the benefits of the Dolby System during playback of prerecorded Dolby encoded tapes.
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A significant improvement in signal to noise ratio is readily apparent even on 2 track machines operating at 15 ips. You cannot actually realize the full potential of your tape deck until you have experienced the 10dB improvement in signal to noise ratio and the widened dynamic range made possible by these noise reduction units. We are confident that once you have tried this process you will never again be satisfied with the conventional recording methods.

The improvement in sound quality is dramatic and results have been most promising. It is anticipated that this broadcasting method will become increasingly popular in the immediate future. The TEAC noise reduction units when connected between your tuner and amplifier will provide reception of Dolby encoded FM broadcasts completely free of matrix or multiplex carrier noise.

• Anmerkung : In Europa gab es meines Wissens nach nie einen Sender, der über egal welchen Wellenbereich ein mit DOLBY codiertes Porgramm ausgestrahlt hatte.

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Normally as a tape is copied, the noise level tends to double. The inherent noise or hiss of the original tape is transferred to and added with the noise of the tape being made. Noise buildup was the end result. With the TEAC noise reduction unit this noise buildup no longer occurs. You may copy a tape as often as desired without serious degradation of the original high sound quality.
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You may now produce recordings at reduced tape speeds without loss of audio quality. Your noise reduction unit will actually pay for itself through reduced raw tape costs.

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Many kinds of noise exist to plague the serious music lover but the most apparent and persistent type has been the tape hiss formerly considered an inevitable factor in magnetic recording. It was particularly evident during pianissimo or low level passages and was always present even on recordings made with the best available tape on the most sophisticated equipment. This hiss tended to increase as tape speeds were lowered and track width and spacing were narrowed. This hiss also tended to add as tapes were copied or dubbed.

Now through modern scientific technology, the Dolby Noise Reduction System totally eliminates tape noise and hiss as a limiting factor in the production of quality recordings.

This system permits the recording and reproduction of delicate pianissimo passages formerly covered or masked by tape noise and hiss. When added to your present equipment, it makes available a wider dynamic sound range, a new clarity and brilliance with a complete absence of attenuative filtering. Low level passages are reproduced in all their original beauty, tonal nuances formerly covered by the noise mask will be heard for the first time. Not only will you experience superior sound, your tape expenses can be halved as you may record at reduced tape speed without sacrificing sound quality.

The Dolby Noise Reduction System has won wide acceptance within the recording industry and is used for the production of master recordings by virtually all recording companies. Now with the introduction of these superb noise reduction units, the myriad benefits of this system are available to the tape hobbyist at a sharply reduced cost.

As we at TEAC manufacture our own ICs (integrated circuits) under an extremely rigid quality control program and assemble the Dolby circuitry to very close electronic tolerances. We have succeeded in reducing distortion levels over competing units using the Dolby System by as much as 3%.

All controls have been "human engineered" for optimum ease of operation. Calibration procedures have been simplified and reduced to a minimum. Once properly accomplished they normally need not be recalibrated unless system components are changed.

Stop in today at your TEAC showroom and audition these revolutionary units. Discover the unused potential in your tape deck, see for yourself the dramatic improvement in sound quality now available, with the TEAC noise reduction units.

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TEAC CORPORATION SALES OFFICE: SHINJUKU BLDG., 1-8-1, NISHI-SHINJUKU, TOKYO PHONE: (03) 343-5151
TEAC CORPORATION OF AMERICA 7733 TELEGRAPH ROAD, MONTEBELLO, CALIFORNIA 90640 PHONE: (213) 726-0303
TEAC EUROPE B.V. KABELWEG 45-47, AMSTERDAM-W. 2 NETHERLANDS PHONE: 020-821656
TEAC HONGKONG LIMITED ROOM No. 1105 MELBOURNE PLAZA 33 QUEEN'S ROAD C. HONG KONG PHONE: 252027
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