The DR-2450 is an optimum analyzer for checking and inspection of the digital output from digital audio equipment such as MD recorders, DCC recorders. CD players, LD players, DAT recorders, and BS tuners. It can input a digital audio interface signal (AES, EBU, or EIAJ CP-1201 standard) corresponding to the three kinds of transmission including the balanced, unbalanced and optical transmissions, and can measure the sampling frequency, C-bits, U-bits, and various errors, and collect data on the C-bit changing points. To allow monitoring of the waveforms? it is equipped with the analog monitor output which outputs a D/A converted signal.