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自70年代以来,随着集成电路和电子计算机技术的发展,数字技术已进入电视领域,形成了数字电视技术,它与模拟电视技术相比,有很大优越之处。 一、数字视频信号的数字编码 这是任何数字视频设备的最基本的技术问题。它涉及4个基本方面,即数字编码方式,取样频率,编码比特数、实际应用考虑。 1、数字编码方式:目前一般有复合编码和分量编码两种。复合编码方式是对PAL复合电视信号直接进行取样、量化和编码。其优点是比较简单、直接了当,信号不需要经过色度信号的解码和再编码处
Since the 1970s, with the development of integrated circuit and electronic computer technology, digital technology has entered the field of television and formed the digital television technology. Compared with analog TV technology, it has great advantages. Digital encoding of digital video signals This is the most basic technical issue for any digital video device. It involves four basic aspects, namely, digital encoding, sampling frequency, encoding the number of bits, practical considerations. 1, digital coding: At present, there are two kinds of composite coding and component coding. Composite encoding is the PAL composite television signal directly sampled, quantified and encoded. Its advantage is relatively simple, straightforward, the signal does not need to go through the chrominance signal decoding and re-encoding