| 摘要 |
A broadcast receiver, and associated detection method, has a (single) tuner 11 that can be tuned away from a first frequency, from which a first broadcast signal is being received, to a second frequency to detect alternative broadcast signals (i.e., scan alternative frequencies, AF) and tuned back to the first frequency to continue receiving the first broadcast signal without interrupting the received service. This the fact that, in systems such as OFDM (e.g., DAB) systems, not all broadcast data packets (31, Figure 3) within a received frame are required to be decoded in order to receive a desired broadcast service, is utilised. The tuner is tuned away, demodulating and decoding a packet from a first received frame, detects or discovers alternative services (second broadcast signal at second frequency) and is quickly tuned back to the original frequency to continue receiving the first broadcast service from a second received frame - without any perceivable break (to the user) in the reception of the first broadcast; the first and second frames may be consecutive frames in the broadcast signal. A quality metric of the second (alternative) broadcast signal may be determined. |
