Data regeneration apparatus

Abstract

An apparatus for generating digital data. A signal regenerated by a playback head is sequentially processed by an analog filter, A / D, and an interpolator, and is provided to a digital equalizer. The digital equalizer has a plurality of variable filters connected in parallel. While the characteristic of the first variable filter is adjusted, the interpolator performs timing control using the output of the second variable filter. After the adjustment is completed, the switch SW is switched to perform timing control of the interpolator using the output of the first variable filter. Thus, capable of varying the equalization processing characteristics of a digital signal and facilitating the timing adjustment of an interpolator at the same time.

Description

technical field [0001] The invention relates to a data reproduction device, in particular to equalization processing and timing control of digital data reproduction signals. Background technique [0002] Conventionally, a technique for reproducing digital video signals and digital audio signals recorded on a magnetic tape or the like is known. In this device, the reproduced signal is equalized by an equalizer to compensate for the degradation of the signal in the recording and reproduction system, the characteristic dispersion caused by the type of tape, the characteristic dispersion of the magnetic head, etc., to reduce errors. [0003] Figure 12 A block diagram showing the configuration of a conventional playback device including an equalizer. The reproduction circuit 103 is composed of a rotary head, and reproduces information such as video signals, audio signals, and subcodes from the tracks of the magnetic tape 101, and outputs them as analog signals. The amplifier 1...

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Problems solved by technology

[0008] On the other hand, there is a problem that timing control becomes difficult in a configuration in which the equalization characteristics of the equalizer can be variably adjusted.

That is, for example, when converting to a digital signal by asynchronous sampling (the reproduced signal is sampled with a clock asynchronous to its symbol), in order to estimate the symbol point data between each sampling point, it is necessary to use an interpolator. Interpolation, the time of interpolation is optimized according to the output feedback control of the equalization device, but changing the filter characteristics of the equalization device and changing the interpolation time are synchronized, so there is a problem of difficulty in adjustment

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