此前，医学遥测设备的运行没有得到保护，可能受到空白电视频道或为低功率工作预留的特别频道的干扰。
Prior to this, medical telemetry devices had been operating unprotected from interference either on vacant TV channels or on special channels reserved for low-power operation.
空白频谱是有意留出的空闲电视频道，其目的是防止现有电视台之间信号干扰。
White Spaces are TV channels intentionally left unused to avoid interference between existing TV stations.
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