RECEIVING DEVICE, METHOD, AND PROGRAM
There is provided a receiving device including a gain supplying unit that supplies a gain for adjusting power of an intermediate frequency OFDM signal acquired from a broadcast signal received by a tuner, the broadcast signal conforming with the DVB-T2 standard and having a plurality of profiles mixed, a position detecting unit that detects a head position of a frame corresponding to each of the plurality of profiles, and a time constant changing unit that changes, in accordance with a profile of the frame, a time constant to specify a time interval at which the gain supplying unit calculates the gain based on power of the intermediate frequency OFDM signal outputted from the tuner when a head position of the frame is detected.
1 . A receiving device comprising:
a gain supplying unit that supplies a gain for adjusting power of an intermediate frequency OFDM signal acquired from a broadcast signal received by a tuner, the broadcast signal conforming with the DVB-T2 standard and having a plurality of profiles mixed;
a position detecting unit that detects a head position of a frame corresponding to each of the plurality of profiles; and
a time constant changing unit that changes, in accordance with a profile of the frame, a time constant to specify a time interval at which the gain supplying unit calculates the gain based on power of the intermediate frequency OFDM signal outputted from the tuner when a head position of the frame is detected.
2 . The receiving device according to claim 1 , further comprising:
a profile determination unit that determines whether or not a frame in which the head position has been detected is a frame corresponding to a profile from which decoded data is to be outputted, wherein
in a case where a frame in which the head position has been detected is determined to be a frame corresponding to a profile from which decoded data is to be outputted, the time constant changing unit changes a time constant of the gain supplying unit into a time constant to shorten a time interval at which the gain is calculated.
3 . The receiving device according to claim 2 , further comprising:
a gain holding control unit that carries out control so that a gain supplied from the gain supplying unit is held constant in a case where the frame in which the head position has been detected is determined not to be a frame corresponding to a profile from which decoded data is to be outputted.
4 . The receiving device according to claim 1 , further comprising:
a profile determination unit that determines whether or not a frame in which the head position has been detected is a frame corresponding to a profile from which decoded data is to be outputted; and
an initial value setting unit that sets an initial value of a gain supplied from the gain supplying unit to a prescribed value determined in advance in a case where a frame in which the head position has been detected is determined to be a frame corresponding to a profile from which decoded data is to be outputted.
5 . The receiving device according to claim 4 , wherein
the initial gain setting unit sets a value suitable for demodulation of a signal of a profile from which the decoded data is to be outputted as an initial value of the gain.
6 . A receiving method of a receiving device having a gain supplying unit that supplies a gain for adjusting power of an intermediate frequency OFDM signal acquired from a broadcast signal received by a tuner, the broadcast signal conforming with the DVB-T2 standard and having a plurality of profiles mixed, the method comprising:
detecting a head position of a frame corresponding to each of the plurality of profiles; and
changing, in accordance with a profile of the frame, a time constant to specify a time interval at which the gain supplying unit calculates the gain based on power of the intermediate frequency OFDM signal outputted from the tuner when a head position of the frame is detected.
7 . A program for causing a computer to function as:
a gain supplying unit that supplies a gain for adjusting power of an intermediate frequency OFDM signal acquired from a broadcast signal received by a tuner, the broadcast signal conforming with the DVB-T2 standard and having a plurality of profiles mixed;
a position detecting unit that detects a head position of a frame corresponding to each of the plurality of profiles; and
a time constant changing unit that changes, in accordance with a profile of the frame, a time constant to specify a time interval at which the gain supplying unit calculates the gain based on power of the intermediate frequency OFDM signal outputted from the tuner when a head position of the frame is detected.
8 . A receiving device comprising:
a gain supplying unit that supplies a gain for adjusting power of an intermediate frequency OFDM signal acquired from the broadcast signal that is received by a tuner and conforms with the DVB-T2 standard;
a gain holding control unit that carries out control to keep a gain constant, the gain being supplied from the gain supplying unit in an FEF section in the broadcast signal;
a mixed existence determination unit that determines whether or not a plurality of profiles exists in a mixed manner in the broadcast signal; and
a gain holding operation stopping unit that stops an operation of the gain holding control unit in a case where a plurality of profiles is determined to exist in a mixed manner in the broadcast signal.
9 . A receiving method of a receiving device having a gain supplying unit that supplies a gain for adjusting power of an intermediate frequency OFDM signal acquired from the broadcast signal which is received by a tuner and conforms with the DVB-T2 standard, and a gain holding control unit that carries out control to keep a gain constant, the gain being supplied from the gain supplying unit in an FEF section in the broadcast signal, the method comprising steps in which:
a mixed existence determination unit determines whether or not a plurality of profiles exists in a mixed manner in the broadcast signal; and
a gain holding operation stopping unit stops an operation of the gain holding control unit in a case where a plurality of profiles is determined to exist in a mixed manner in the broadcast signal.
10 . A program for causing a computer to function as a receiving device comprising:
a gain supplying unit that supplies a gain for adjusting power of an intermediate frequency OFDM signal acquired from the broadcast signal which is received by a tuner and conforms with the DVB-T2 standard;
a gain holding control unit that carries out control to keep a gain constant, the gain being supplied from the gain supplying unit in an FEF section in the broadcast signal;
a mixed existence determination unit that determines whether or not a plurality of profiles exists in a mixed manner in the broadcast signal; and
a gain holding operation stopping unit that stops an operation of the gain holding control unit in a case where a plurality of profiles is determined to exist in a mixed manner in the broadcast signal.