摘要 |
PURPOSE:To reduce the amount of interference to a nearby system and a burst, by inverting the sign of a base-band data signal before band limitation in accordance with a time slot. CONSTITUTION:A carrier wave 1 is processed by orthogonal amplitude modulation 3 wtth a base-band data signal which contains burst-like information processed by band limintation 4, and the modulated wave is turned on and off under control 2 in response to a control signal which synchronizes with the burst-like information. Then, the base-band data signal before the band limitation 4 is supplied to a sign infverting circuit 5 to make the sign of data of a time slot right before or after the burst-like information different from the code of data of the starting or ending time slot of the burst-like information. Thus, the amount of interference to a nearby system is reduced without providing a band-pass filter for an RF band. |