But to implement signal processing digitally instead of using analog systems was still out of the question.

但是进行数字信号处理而不使用模拟系统仍然是一个问题。

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Both Europe and Japan have based their efforts on the development of analog systems that use wavelike transmission signals.

欧洲和日本都曾致力于开发采用波状传输信号的模拟系统。

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Compared with analog systems, this system has more precision and adaptability. Little cost was added to achieve these advantages.

该系统与模拟系统相比仅增加了少量的低成本集成电路，具有精确度高、适应性好等特点。

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Qualcomm started out making satellite-based tracking systems for trucking companies, but Irwin had far bigger plans:selling the world on a new digital way to connect cellular calls and carry 40 times as much traffic as the old analog systems then in place.

FORBES: Magazine Article

Digital radio, because of error correction requirements inherent in two-way radio communication, is substantially more fragile than the older analog radio systems.

FORBES: Free Speech v. Denial Of Communications For Public Safety Agencies?

Some cable programmers argued that the FCC's order would make it harder for them to gain access to cable systems if both analog and digital signals of local stations had to be offered.

WSJ: Cable Must Air Broadcast Signals