Digital signal processor

A digital signal processor for switching its output between plural digital audio data, according to an output switching instruction from the outside, comprising:

• a first coded audio data generation unit for generating first coded audio data;
• a second coded audio data generation unit for generating second coded audio data;
• a signal switching unit for outputting one of the first and second coded audio data respectively supplied from the first and second coded audio data generation units, and switching the output between these data;
• and
• a signal switching control unit for controlling the output switching of the signal switching unit;
• wherein, on receipt of the output switching instruction from the outside, said signal switching control unit detects the periodicity of the first or second coded audio data outputted from the signal switching unit, and controls the signal switching unit so as to switch the output when a period of the coded audio data is ended and, simultaneously, controls the first or second coded audio data generation unit so as to generate data to be output after the output switching, from the beginning of a period of the data.

A digital signal processor for switching its output between plural digital audio data, according to an output switching instruction from the outside, comprising:

• a plurality of signal generation units for generating plural pieces of digital data, respectively;
• a signal switching unit for outputting one of the plural pieces of digital data supplied from the signal generation units, and switching its output;
• and
• a signal switching control unit for controlling the timing of output switching of the signal switching unit;
• wherein periodical coded data is output from the signal switching means, and when the signal switching control unit receives an output switching instruction from the outside, it controls the signal switching unit so that output switching is performed at the time when a period is ended, and
• when the signal switching unit switches its output data to the coded data, the signal switching control unit controls the signal generation unit so that the coded data is generated from the beginning of the period, simultaneously with the output switching.