BNO Acoustics QT-5: Phon

1) A unit of equal loudness for all audio frequencies.
2) The phon is numerically equal to dBspl at 1000 Hz but varies at other frequencies according to ear sensitivity to frequency.

BNO Acoustics QS-4: Record Ready
A control state of one track of a multitrack tape recorder where the track will go into record when the record function of the tape recorder is activated.

Hearing Limitation
An inability of the ear to hear important characteristics of sound under certain conditions. Characteristics that can be affected include pitch, level, clarity, presence and direction.

Mini Disk (MiniDisc)
A small compact disc that can be recorded on by general consumers; introduced by Sony at the end of 1992.

Pure Tone
A tone without harmonic frequencies except for the fundamental frequency and with a sine wave shape.

Arc
The visible sparks generated by an electrical discharge.

Time Constant
In a circuit that has reactance, the time it takes for the current or voltage to substantially stabilize in the circuit when the voltage or current is changing.