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在英国邮政部标准两线音频电路上作为放大用的是混合放大器或负阻抗放大器.在能利用标准负载的10奈培~(16)/哩或20奈培~(16)/哩电缆上通常采用这些电路.作为连结网络.负阻抗增音机提供出一种在使用小容量空载电缆对的线路上作为放大的可采用的方法.到目前为止,所发展起来的这种电路同规定的标准方法比较使传输特性,特别是在群延迟方面得到了改进.
Amplified amplifiers or negative-impedance amplifiers are used for amplifying on the standard two-wire audio circuits of the U.S. Department of Postal. Typically on 10 neper ~ (16) / miles or 20 nanometers ~ (16) / miles of cables that can utilize standard loads These circuits are used as a connection network. Negative-impedance amplifiers provide an alternative method of amplification on lines that use a small capacity unloaded cable pair. So far, such circuits have been developed as specified Standard methods make improvements in transmission characteristics, especially in terms of group delay.