Audio Electronics by J. Hood

By J. Hood

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8, ignoring for the moment any frequency response' modifications which may have been imposed by the record-stage noise reduction processing elements, or the converse process of the subsequent decoding stage. Normally, the frequency response equalisation function will be brought about by frequency sensitive impedance networks in the feedback path of an amplifier element, and a typical layout is shown in Fig. 23. Considering the replay curve shown in Fig. 3, depending on application, tape type, and tape speed.

This is determined by contact profile and gap design, consideration of which is beyond the scope of this chapter. Pfll~' ~ ~ I r i ] ~- " I i Tape drive control i_ ( Fig. 18 b'llp Er l_r5 Schematic layout of the "building blocks'of a magnetic tape recorder. Tape Recording 31 The replay amplifier Ignoring any noise reduction decoding circuitry, the function of this is to amplify the electrical signal from the replay head, and to apply any appropriate frequency response equalisation necessary to achieve a substantially uniform frequency response.

Non-digital) magnetic tape recorders is as shown, in block diagram form, in Fig. 18. The critical parts of the design, in respect of added circuit noise, are the replay amplifier, and the bias/erase oscillator. They will be considered separately. It should also be noted that the mechanical design of both the erase and record heads can influence the noise level on the tape. This is determined by contact profile and gap design, consideration of which is beyond the scope of this chapter. Pfll~' ~ ~ I r i ] ~- " I i Tape drive control i_ ( Fig.

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