In a telephone system, a term applied to any non data transmission that makes use of voicegrade lines.
在电话系统中的一种术语。适用于利用音频段线路的任何非数据传输业务。
2
Some people say the voice is their father’s or grandmother’s or the voice of their third-grade teacher.
一些人说这想法是他们父亲的，或是他们祖母的，或是他们三年级老师的。
3
A data channel on which the information transmitted can take any value between the limits defined by the channel. Voice - grade channels are analog channels.