Since the adoption of noise reduction units as an integral part of many modern high-quality cassette recorders, there has been an increased requirement for a combined machine and tape performance which not only meets the normal hi-fi requirements, but also is consistent between products. This sort of standard is readily achieved at professional levels since tape recorders of such a class provide access to both bias and pre-emphasis. In addition, test tapes and the instrumentation often available in professional studios make it a simple task to compensate for variations in tape or machine performance. This is not so of cassette recorders where bias and preemphasis is almost always fixed, or at most, limited to two or three factory-set alternatives. The author claims that greater uniformity of excellence could be offered to the consumer by the adoption of a few simple proposals offered in the body of this paper.
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