The only new equipment required to implement this test technique is a tape
deck. The many inexpensive stereo cassette decks on the market today
adequately fill the recording and playback requirements of the technique. Open
reel recorders were not used because of the greater potential for tape damage
due to handling.
The frequency response characteristics of a particular tape deck must be
determined experimentally to verify that it satisfies program requirements.
Minor non-linearities in the frequency responses must be measured and
compensation factors determined to linearize the tape deck response when
recording the synthetic random signal. The tape deck requirements and the
procedure for evaluating response characteristics and determining the
compensation factor are discussed in detail in Chapters 2 and 6