利用大规模集成电路(LSI)技术的单路编码器,在经济性和灵活性方面受到了人们的注意,正在研究各式各样的电路结构。本文从元件精度这一点,以把简单的计数型编码器用作单路编码器为目的,系统地讨论各种电路形式。首先,笔者提出了用2的幂乘方控制计数时钟脉宽进行压扩编码的种种电路形式。然后,从编码处理形态的观点,把计数型编码器进行分类。在弄清这些元件精度和特性恶化的关系之后,肯定了适合于LSI化的电路形式。还讨论了应用在数字网中的条件,提出了计数时钟和0次群(64kb/S)即使不同步,PCM输出信号也和0次群同步的简单方法。又提出了适用于计数型编码器的模拟输入信号电平调整方法。通过以上一系列的讨论,可以明确单路计数型压扩编码器的最佳结构。 Single-channel encoders that use LSI technology have drawn attention to economy and flexibility and are studying a wide range of circuit configurations. This article systematically discusses a variety of circuit forms from the point of view of component accuracy, using a simple count type encoder as a single-pass encoder. First of all, the author put forward a variety of circuit forms for companding coding with a power-of-2 control count clock pulse width. Then, counting type encoders are classified from the viewpoint of the encoding mode. After ascertaining the relationship between the accuracy of these elements and the deterioration of characteristics, it was confirmed that the circuit form suitable for LSI was. The conditions applied in digital networks are also discussed. A simple method of counting clock and 0th order (64kb / s) synchronization of the PCM output signal with the 0th order is proposed. Also proposed for the analog encoder input signal level adjustment method. Through the above series of discussions, you can identify the best single-channel count-type companding encoder structure.