Patent ID: 7236838

Claim:
A signal processing apparatus, comprising: a decoder for decoding a stream signal so as to generate a digital audio signal of a low frequency effect channel and digital audio signals of first through n'th (n≧2) channels, wherein the stream signal includes information of a low frequency effect channel, the information containing a low frequency component, and also includes information of the first through n'th channels, the information containing components of all frequency bands, the first through n'th channels having different sound source positions; an adder section for adding the digital audio signal of the low frequency effect channel and the digital audio signal of a specified channel among the first through n'th channels, so as to generate an addition signal; an n number of D/A conversion sections for converting the digital audio signals of the first through n'th channels, excluding the digital audio signal of the specified channel, and the addition signal into n types of analog audio signals; a first signal processing section for performing a first signal processing process of the analog audio signal obtained as a result of D/A conversion of the addition signal, so as to generate an analog audio signal of the low frequency effect channel; and a second signal processing section for performing a second signal processing process of the analog audio signal obtained as a result of D/A conversion of the addition signal, so as to generate an analog audio signal of the specified channel.