Numberbattle tournament test challenge

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\(SDR_{instr} = 10log_{10}\frac{\sum_n(s_{instr,left\ channel}(n))^2 + \sum_n(s_{instr,right\ channel}(n))^2}{\sum_n(s_{instr,left\ channel}(n) - \hat{s}{instr,left\ channel}(n))^2 + \sum_n(s{instr,right\ channel}(n) - \hat{s}_{instr,right\ channel}(n))^2}\)