When a signal is panned centrally, the same signal will be output (identically) on both the left and right channels. If you were to pan this signal from the extreme left channel through the centre and then onto the extreme right channel, it will sound as if the level rises as it passes through the centre. The panning law was integrated to introduce a 3dB level drop at the centre. If you were to sum the left and right channels in a mono situation, the centre gain would result in a 6dB rise, so attenuating by that amount became a must in the broadcast industry as mono compatibility is always a prime issue.
Ryusa 发表于 17-4-18 18:36
取决于声场法则（Panning Law）。
也有 4.5dB、6dB 之类的情况，简单的 L+R 变为单声道时会造成削波的情 ...