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远动技术和在线控制迅速发展对通道不断提出新的要求,概括说就是要求通道速度快、抗干扰能力强。因此,国内许多远动装置都由数学调频通道发展为数字调相通道;信息传送速度也由250波特提高到400、600、1200波特。速度较低的远动数字信息是与模拟电话共用信道的,在一个标准电话频带范围(0.3～3.4千赫)内、预留给远动的是上音频带(2.7～3.4千赫)。根据一般概念,认为在上音频带最快只能传送300波特的二相数字调相(2dpsk)信号,这样就迫使许多远动设备在低速范围内运行。本文根据理论和实践,证明在上音频带可以传送600波特、2dpsk远动数字信息。
The rapid development of telecontrol technology and online control constantly put forward new requirements on the channel. In summary, the requirement is that the channel speed is fast and the anti-interference ability is strong. As a result, many remote devices in China have been developed from digital FM channels to digital phase-modulated channels; the speed of information transmission has also been raised from 250 baud to 400,600,1200 baud. The lower speed telecontrol digital channels share the channel with the analogue telephone. Within a standard telephone band range (0.3 to 3.4 kHz), the upper audio band (2.7 to 3.4 kHz) is reserved for telecontrol. According to the general concept, it is considered that the fastest two-phase digital phase-modulated (2dpsk) signal of 300 baud can be transmitted in the upper audio band, thus forcing many remote devices to operate in a low speed range. Based on theory and practice, this paper proves that 600 baud and 2 dpsk telematic digital information can be transmitted in the upper audio band.