Receiving device, receiving method, and program

1. A receiving device, comprising:

a receiver configured to receive only a partial segment among a plurality of segments obtained by dividing a frequency band of one physical channel when the receiving device is in a waiting state, and returning from the waiting state to an activated state when warning information is transmitted, if transmission of the warning information by the partial segment is possible, the warning information being seismic-motion warning information transmitted by an auxiliary channel (AC) signal prescribed by an integrated services digital broadcasting-terrestrial (ISDB-T) standard; and

a controller configured to start processing for outputting a warning in response a determination by the receiver that the seismic-motion warning information is transmitted and a detection flag indicating that the seismic-motion warning information is transmitted or at least part of the seismic-motion warning information is output from the receiver, wherein

the receiver outputs the detection flag or the at least part of the warning information from a pin of a first semiconductor chip on which the receiver is mounted to a pin of a second semiconductor chip on which the controller is mounted, and

the controller starts processing for outputting warning if the detection flag or the at least part of the warning information is input to the pin of the second semiconductor chip.

2. The receiving device according to claim 1 , wherein the partial segment is segment No. 0 prescribed by the ISDB-T standard, and

the receiver starts reception of whole of 13 segments when the warning information is transmitted.

3. The receiving device according to claim 1 , wherein

the receiver determines whether or not the seismic-motion warning information is transmitted at a timing of completion of reception of bits from a second bit of the AC signal to a fourth bit, and, if the received 3 bits are 001 or 110, the receiver determines that the seismic-motion warning information is transmitted and outputs the detection flag indicating that the seismic-motion warning information is transmitted.

4. The receiving device according to claim 1 , wherein the receiver determines whether or not the seismic-motion warning information is transmitted at a timing of completion of reception of bits from a second bit of the AC signal to a predetermined bit of a synchronization signal of the seismic-motion warning information, represented by a bit sequence from a fifth bit to a 17-th bit, and, if 3 bits from the second bit to a fourth bit are 001 or 110, the receiver determines that the seismic-motion warning information is transmitted and outputs the detection flag indicating that the seismic-motion warning information is transmitted when part of the bit sequence representing the synchronization signal corresponds with part of a known bit sequence or when all of the bit sequence representing the synchronization signal corresponds with all of a known bit sequence.

5. The receiving device according to claim 1 , wherein

the receiver determines whether or not the seismic-motion warning information is transmitted at a timing of completion of reception of bits from a second bit of the AC signal to an 18-th bit or a 19-th bit, and, if 3 bits from the second bit to a fourth bit are 001 or 110, the receiver determines that the seismic-motion warning information is transmitted and outputs the detection flag indicating that the seismic-motion warning information is transmitted when one bit as the 18-th bit is 0 or when two bits as the 18-th bit and the 19-th bit are 00.

6. The receiving device according to claim 5 , wherein

the receiver further receives a 20-th bit of the AC signal or the 20-th bit and a 21-st bit.

7. The receiving device according to claim 1 , wherein

the receiver determines whether or not the seismic-motion warning information is transmitted at a timing of completion of reception of bits from a second bit of the AC signal to a 24-th bit, and, if 3 bits from the second bit to a fourth bit are 001 or 110, the receiver determines that the seismic-motion warning information is transmitted and outputs the detection flag indicating that the seismic-motion warning information is transmitted when 3 bits from a 22-nd bit to the 24-th bit are 000.

8. The receiving device according to claim 1 , wherein

the receiver detects an error in bits of the seismic-motion warning information by using a CRC code from a 113-th bit of the AC signal to a 122-nd bit at a timing of completion of reception of the CRC code, and outputs the seismic-motion warning information if no error is detected.

9. The receiving device according to claim 1 , wherein

the receiver stores the detection flag or the at least part of the warning information in a register in the first semiconductor chip on which the receiver is mounted, and

the controller is mounted on the second semiconductor chip different from the first semiconductor chip and checks information stored in the register at a predetermined cycle, and, if the controller confirms that the detection flag or the at least part of the warning information is stored in the register, the controller starts processing for outputting warning.

10. The receiving device according to claim 1 , wherein

the receiver encodes the detection flag or the at least part of the warning information by a predetermined encoding system, and outputs information resulting from the encoding from the pin of the first semiconductor chip after addition of a preamble composed of a predetermined number of bits.

11. A receiving method, comprising:

receiving, by a receiver, only a partial segment among a plurality of segments obtained by dividing a frequency band of one physical channel when a device is in a waiting state, and returning from the waiting state to an activated state when warning information is transmitted, if transmission of the warning information by the partial segment is possible, the warning information being seismic-motion warning information transmitted by an auxiliary channel (AC) signal prescribed by an integrated services digital broadcasting-terrestrial (ISDB-T) standard;

starting, by a controller, processing for outputting a warning in response a determination by the receiver that the seismic-motion warning information is transmitted and a detection flag indicating that the seismic-motion warning information is transmitted or at least part of the seismic-motion warning information is output from the receiver;

outputting, by the receiver, the detection flag or the at least part of the warning information from a pin of a first semiconductor chip on which the receiver is mounted to a pin of a second semiconductor chip on which the controller is mounted; and

starting, by the controller, processing for outputting warning if the detection flag or the at least part of the warning information is input to the pin of the second semiconductor chip.

12. A non-transitory computer-readable medium including a program, which when executed by a computer, causes the computer to execute processing comprising:

receiving, by a receiver., only a partial segment among a plurality of segments obtained by dividing a frequency band of one physical channel when a device is in a waiting state, and returning from the waiting state to an activated state when warning information is transmitted, if transmission of the warning information by the partial segment is possible, the warning information being seismic-motion warning information transmitted by an auxiliary channel (AC) signal prescribed by an integrated services digital broadcasting-terrestrial (ISDB-T) standard;

starting, by a controller, processing for outputting a warning in response a determination by the receiver that the seismic-motion warning information is transmitted and a detection flag indicating that the seismic-motion warning information is transmitted or at least part of the seismic-motion warning information is output from the receiver;

outputting, by the receiver, the detection flag or the at least part of the warning information from a pin of a first semiconductor chip on which the receiver is mounted to a pin of a second semiconductor chip on which the controller is mounted; and

starting, by the controller, processing for outputting warning if the detection flag or the at least part of the warning information is input to the pin of the second semiconductor chip.

13. A receiving device, comprising:

means for receiving only a partial segment among a plurality of segments obtained by dividing a frequency band of one physical channel when the receiving device is in a waiting state, and return from the waiting state to an activated state when warning information is transmitted, if transmission of the warning information by the partial segment is possible, the warning information being seismic-motion warning information transmitted by an auxiliary channel (AC) signal prescribed by an integrated services digital broadcasting-terrestrial (ISDB-T) standard; and

means for starting processing for outputting a warning in response a determination by the means for receiving that the seismic-motion warning information is transmitted and a detection flag indicating that the seismic-motion warning information is transmitted or at least part of the seismic-motion warning information is output from the means for receiving, wherein

the means for receiving outputs the detection flag or the at least part of the warning information from a pin of a first semiconductor chip on which the means for receiving is mounted to a pin of a second semiconductor chip on which the means for starting is mounted, and

the means for starting starts processing for outputting warning if the detection flag or the at least part of the warning information is input to the pin of the second semiconductor chip.