前言由于采用了PCM方式,磁性录放装置的性能已有飞速提高。在实用方面,最大的问题是脱落造成的噪声,这一点也因研究出纠错码而得到解决,结果进一步提高了可靠性。随着使用器件的IC化程度的提高,大大降低了成本。因此,不仅专业用装置实现了商品化,而且民用装置也实现了商品化。 Preface Due to the PCM method, the performance of magnetic recording and reproducing apparatus has been rapidly increasing. In practical terms, the biggest problem is the noise caused by shedding, which is also solved by the development of error-correcting codes. As a result, the reliability is further improved. With the use of devices to improve the degree of IC, greatly reducing costs. Therefore, not only professional devices have been commercialized, but also civilian devices have been commercialized.