Abstract: A data recording device for recording data on a magnetic tape by means of a rotational head. A buffer memory buffers the data received through input/output unit, and a controller controls the data recording device to recording and reproduce data on and from the magnetic tape. A digital signal processor (DSP) converts the data from the buffer memory into a digital audio tape recorder (DAT) format, and a memory stores the converted data from the DSP to compare with the data recorded on the magnetic tape. A recording amplifier amplifies the converted data from the DSP and delivers the amplified converted data to the rotational head to record on the magnetic tape, and a reproduction amplifier amplifies the data reproduced from the magnetic tape by the rotational head.

Abstract: 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