| 摘要 |
A digital audio signal mixing circuit for mixing two digital audio signals which have sampling frequencies different from each other and for generating the mixed data of an analog format, includes: a first serial-parallel converting unit for converting first serial digital audio data into first parallel data in synchronism with a first bit clock; a second serial-parallel converting unit for converting second serial digital audio data into second parallel data in synchronism with a second bit clock; a first and a second latching unit for converting continually varying second parallel data into parallel data stabilized in one channel area, for respectively separating the converted parallel data into third data of a left channel and fourth data of a right channel, and for temporarily storing the separated data; a first selecting unit for selectively outputting one of the third and fourth data as fifth data in response to a signal representing whether the first parallel data is data of the left channel or data of the right channel, thereby mixing data according to the channel to which it belongs; an adding unit for mixing the first and fifth parallel data and outputting the mixed data as unitary sixth parallel data; a parallel-serial converting unit for converting the sixth parallel data into serial data in synchronism with the first bit clock; and a digital/analog converting unit for converting data outputted in the parallel-serial converting unit into analog format.
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