| 摘要 |
A method and apparatus by which active information channels are sampled at each station so that information bursts are formed directly by the sampler, thereby eliminating the need for a time-compressing memory to form the bursts. The active channels at each station are sampled at the proper time to reach the satellite in the TDM time slot assigned to the station. The sampling period is the Nyquist period and is equal to the satellite TDM frame time. The sampling period is divided into equal intervals identical in number to the total number of channels in the system so that there is one channel in each interval. Consequently, the burst from the sampler of each station has a burst length or occurs in the period NT where y is the number of active channels at the station, N is the total number of channels in the system, and T is the Nyquist sampling period, which is 125 microseconds for voice intelligence. Channels may be added to a station's transmission burst by activating these channels at the sampler, thereby increasing the length of the burst to accommodate the added channels. The burst length is shortened if channels are dropped.
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