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家用录像机的自动化程度相当高,用户只需简单地操作就能完成录/放等主要功能。这与新型的录像机的构成密切相关。因此,了解录像机构成原理对于维修、故障分析很有必要。一、实现录像采取的若干措施(一)压缩被记录信号的倍频程要实现录像,首先要将18个倍频程信号压缩至10个倍频程之内,压缩倍频程不能通过减少频带宽度来实现,因为这样做会影响图像质量。为了减少信号频带范围内最高频率与最低频率的倍数值,又不影响图像质量,采用调制可解决这一问
The degree of automation of home video recorders is quite high, allowing users to accomplish major functions such as recording / playback simply by operating. This is closely related to the composition of the new VCR. Therefore, to understand the principle of the recorder for maintenance, failure analysis is necessary. First, to achieve a number of measures taken by the video (a) compression of the octave signal is recorded To achieve the video, the first 18 octave signal compression to 10 octave within the compression octave can not be reduced by reducing the band Width to achieve, because doing so will affect the image quality. In order to reduce the signal frequency range of the highest frequency and lowest frequency multiples, without affecting the image quality, the use of modulation can solve this problem