Patent ID: 7957489

Claim:
A television receiving apparatus, comprising: a reception unit configured to receive a television broadcast signal; a program information decoding unit configured to decode program-related information included with the television broadcast signal; an audio decoding unit configured to decode audio data output from the reception unit to output an audio input signal; a weighting unit configured to output a category signal that is weighted for each type of category of the program-related information; a clock generation unit configured to output a clock signal; a pulse width modulation unit configured to pulse width-modulate the clock signal based on the audio input signal; a converting unit configured to convert output of the pulse width modulation unit and output to a loudspeaker; a control unit configured to control frequencies of the clock signal based on the category signal, wherein when the category signal corresponds to a news category, the control unit controls the clock generation unit so that the clock signal becomes low frequency, compared to when the category signal corresponds to a music category; and an analysis unit configured to analyze signal characteristics of the audio input signal, wherein the analysis unit includes at least one of (i) a stereos detection unit configured to output a parameter in accordance with a difference between L level and R level of the audio input signal, (ii) a frequency characteristic detection unit configured to output a parameter in accordance with a comparison result between medium frequency level and high and low frequency level of the audio input signal, and (iii) a rhythm detection unit configured to output a parameter in accordance with an amplitude change of the audio input signal, wherein one of (a), (b), and (c) is performed based on parameter output from the analysis unit wherein (a) is controlling the clock generation unit so that the clock signal becomes low frequency when a difference between L level and R level of the audio input signal is small, compared to when a difference between L level and R level of the audio input signal is large, wherein (b) is controlling the clock generation unit so that the clock signal becomes low frequency when medium frequency level of the audio input signal is larger than high and low frequency level, compared to when medium frequency level of the audio input signal is smaller than high and low frequency level, and wherein (c) is controlling the clock generation unit so that the clock signal becomes low frequency when the amplitude change of the audio input signal is gentle, compared to when amplitude change of the audio input signal is sever.