| 摘要 |
PURPOSE:To measure the matching of sounds in a high sound pressure level for a long time by constructing the measuring device so as that a reference sound signal and the sound signal to be measured are outputted alternately for every definite short time by controlling the selection in a signal selection section with a signal processing section according to the sound pressure adjusting signal from an adjusting section of the sound pressure to be measured. CONSTITUTION:When the adjustment of the sound pressure level of a sound to be measured is necessary after the output of the signal of the sound to be measured, a sound pressure adjusting signal 12 of the sound to be measured is sent to a signal processing section 18 from a sound pressure adjusting section 11 of the sound to be measured. Receiving the signal, the said section 18 processes the signal 12 and adjusts a level setting amplifier 21 basing on the pressure signal so as that the adjusted signal of the sound to be measured is outputted next time. The alternate outputting of a reference sound signal 3 and the signal 4 of the sound to be measured and the setting of the sound pressure level of the sound to be measured are carried out repeatedly until both sounds are heard on an equal auditory level by a test operator, and when they are felt as the equal level an end signal is sent from the said section 11 to stop the output of the signal to complete the measurement of the matching. |
