JP2005192167A5 - - Google Patents

Claims (14)

Comprising a tuner to switch the broadcast to be received, a receiving apparatus mounted on a mobile body,
Quality evaluation signal generating means for generating a quality evaluation signal based on a time change of radio field intensity in a broadcast signal of a broadcast selected by the channel selection unit;
Channel switching control means for controlling switching of the channel selection unit using the quality evaluation signal generated by the quality evaluation signal generating means;
A receiving apparatus comprising: The receiving apparatus according to claim 1, wherein the quality evaluation signal generation unit generates a quality evaluation signal using an automatic gain control voltage for controlling a level fluctuation of the radio wave intensity. The channel switching control means holds the received broadcast when the time change amount of the automatic gain control voltage increases to a first threshold value or more, and after the time change amount increases to a first threshold value or more, 3. The receiving apparatus according to claim 1, wherein the reception broadcast is switched when a state where the automatic gain control voltage is equal to or higher than the second threshold continues for a first predetermined switching time or longer. The channel switching control means, when the time change amount of the automatic gain control voltage is less than a first threshold, and the state where the automatic gain control voltage is rising continues for a second predetermined switching time or more, The receiving apparatus according to claim 1 or 2, wherein the receiving broadcast is switched. Moving body position acquisition means for acquiring the position of the moving body;
Receiving channel position correspondence storage means for storing information relating to the received broadcast in association with the position of the mobile body;
When the channel switching control means holds the received broadcast , the mobile body position acquisition means acquires information related to the received broadcast before the amount of time change of the automatic gain control voltage increases to a first threshold value or more. 4. The receiving apparatus according to claim 1, wherein the receiving apparatus stores the received channel position in correspondence with the position of the mobile body. In the channel switching control means, the amount of time change of the automatic gain control voltage is less than a first threshold, and the state where the automatic gain control voltage is increasing continues for a second predetermined switching time or more. The receiving apparatus according to claim 1, wherein the received broadcast is switched when the signal is detected a plurality of times. An average value calculating means for calculating an average value of the time change amount of the automatic gain control voltage;
The channel switching control means has a second state in which the average value of the time change amount of the automatic gain control voltage calculated by the average value calculating means is less than a first threshold value and the automatic gain control voltage is increasing. The receiving apparatus according to claim 1, 2 or 4, wherein the reception broadcast is switched when it continues for a predetermined switching time. Comprising speed detecting means for detecting the speed of the moving body;
5. The receiving apparatus according to claim 1, wherein the channel switching control unit changes the second predetermined switching time based on a speed of a moving body detected by the speed detecting unit. . A reception channel distance correspondence storage means for storing the reception broadcast and the reception distance in association with each other;
The said channel switching control means changes the said 2nd predetermined switching time based on the said receiving broadcast memorize | stored in the said receiving channel distance corresponding | compatible memory | storage means, The Claim 1, 2, or 4 characterized by the above-mentioned. Receiver device. The channel switching control means, when switching the reception channel, displays information related to a broadcast received after switching the reception broadcast on an output device that outputs the analog broadcast or digital broadcast. The receiving device according to any one of 9. The channel switching control means to switch the received broadcast, claim 1, characterized in that for displaying the whether the response request switch to an output device for outputting an analog broadcast or digital broadcast to other received broadcast The receiving device according to any one of 9. 12. The receiving apparatus according to claim 11, wherein the channel switching control unit controls switching of the channel selection unit based on a response to the response request . The channel switching control means to switch the received broadcast, the said output device for outputting an analog broadcast or digital broadcast to display switching information to enter information about the received broadcast to switch to, are input to the switching information The receiving apparatus according to claim 1, wherein the receiving apparatus is switched to reception broadcasting . Comprising a channel selection means for switching a broadcast to be received, a receiving method for use in receiving apparatus that will be mounted on a mobile object,
A quality evaluation signal generating step for generating a quality evaluation signal based on a temporal change in radio wave intensity in a broadcast signal of the broadcast selected by the channel selection means ;
A channel switching control step for controlling switching of the channel selection means using the quality evaluation signal generated by the quality evaluation signal generation step;
A receiving method comprising: