... 低速集线器 low speed concentrator，LSC 低速数据信道 low speed data channel，LDC 低速数字系统 low speed digital system，LSDS ...
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在低速率的无线信道上传输视频数据，并保证视频图像的主观质量是视频通信的难点。
It is difficult to transmit the video data in low-speed narrow-band wireless channel and guarantee the subjective quality of video image during video communication.
在3g中卷积码仍然是低速数据的信道编码。
Convolutional code is still the channel coding in low speed data transmission services in 3g.
DT MF信号具有优良的抗干扰性能和一定的抗多普勒频移的能力，广泛应用于语音信道的低速数据通信。
DTMF has perfect anti-interference and some anti-Doppler shift ability and is widely used for low rate communication in audio channel.
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