n a binary PCM system, the output signal$-$to$-$quantization noise ratio is to be held to a minimum of $25$ dB$.$ Find $($i$)$ the number of required levels for a midtread uniform quantizer, $($ii$)$ the corresponding output signal$-$to$-$quantization noise ratio $($in dB$)$ and $($iii$)$ the corresponding bit rate, if sampling rate is $6\mathrm{.}4$ kHz Show all the intermediate steps.