Glossary – W
Practical unit of electrical power equal to one joule per second. (In a DC circuit the number of watts is equal to the product of the volts and amperes; in an AC circuit it is equal to the product of the volts and amperes multiplied by the power factor.)
The shape of the graph representing the successive values of a varying quantity.
Of a sinusoidal plane progressive wave. The perpendicular distance between two wavefronts in which the phases differ by one complete period. The wavelength is equal to the wave velocity divided by the frequency.
Unit of magnetic flux.
The noise measured within the audio frequency band using an instrument which has a frequency selective characteristic.
Filtering a frequency response, prior to measurement.
A filtering network, corresponding to the ear's sensitivity at 40 phons.
A filtering network, corresponding to the ear's sensitivity at 70 phons.
A filtering network, corresponding to the ear's sensitivity at 100 phons.
A filter used for weighting a frequency response, prior to measurement.
Subjective description of a sound with a high proportion of reverberation present.
Random noise signal having an equal amount of energy per hertz. Therefore the energy between 100 and 200 Hz is equal to that between 10,000 and 10,200 Hz.
An acoustically transparent filter, placed over a microphone to shield it from wind-induced vibration.
A low frequency loudspeaker.
Repetitive slow variations in tape speed.
Deviation of frequency resulting from irregular motion in the recording, from duplication or reproduction of a tone, or from deformation of the recording medium.
The length of the tape's path along which tape and head are in intimate contact. Sometimes measured as the angle of arrival and departure of the tape with respect to the head.
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"My Father was killed in an automobile accident on 3 Dec. 1959. The mortuary recorded the funeral on a reel-to-reel tape and gave it to the family. It has never been listened to in all these years since we had no way of playing the tape. When I lucked out and won some money on the Lottery, I invested it in a computer. One of the first things I vowed to do when I became knowledgeable with the internet was to see if I could find someone who could put the contents of the tape onto a medium which we, the family, could listen to. I am so thankful I was able to locate CVC Productions. I received the CD'S today and have played them 3 times already. I was 21 years old at the time, but I remember very little of the funeral after 42 years. It is so wonderful to be able to listen to so many people from my childhood speaking and singing in such clear and natural voices as though time has never expired. I wish I could have done this before my Mother died in 1988. She never heard the tape even though it was in her possession for 29 years. During my research on reel-to-reel magnetic tapes, I read where they tend to lose their magnetism over time, and I feared the tape would be blank. You have done a magnificent job of reproducing the sound and for that me and my family are most grateful."