| 摘要 |
PURPOSE:To provide a data transmitter which normally continues transmitting unidirectionally but can more speedily possess desired data in the case of emergency. CONSTITUTION:A KARAOKE (recorded music accompaniment) terminal equipment 5 judges whether it is necessary to possess designated information data in emergency or not by using an emergency judging means and when it is not necessary to possess them in emergency, a normal data fetching means fetches the correspondent information data through a normal transmission channel. On the other hand, when it is necessary to possess them in emergency based on the judged result of the emergency judging means, an emergency data fetching means requests it through a request dedicated channel to a center 3 and fetches the information data corresponding to that request through a response dedicated channel. |
