In This Section
AES Store
- Learn From The Experts:
Neil Muncy "Early Multitrack Recording"- Oral History Project Gallery
- Other AES Publications
Journal Forum
Virtual Localization by Blind Persons - July 2012
1 comment
Effect of Spatial Location and Presentation Rate on the Reaction to Auditory Displays - July 2012
1 comment
Watermark-Aided Pre-Echo Reduction in Low Bit-Rate Audio Coding - June 2012
1 comment
AES E-Library
A Low-Distortion Acoustic-Measurement Oscillator Using Semiconductor Junctions as Variable-Tuning Elements
The oscillator described is neither of the function-generator type nor of the beat-frequency type. It is basically an RC oscillator, in which the resistances are formed by transistor jnctions whose dc bias voltage is varied to change the frequency. The inherently exponential current-voltage relationship for such junctions results in an accurately logarithmic scale shape. The provision of accurate compensation for the effects on frequency of variations in ambient temperature is of vital importance, but a highly satisfactory result is achieved. The circuit lends itself to the provision of autosweep and warble facilities, and is currently in use by two leading British firms for production testing of loudspeakers and microphones, respectively. The waveform purity-in particular the absence of high-order harmonics-is an attractive feature for such purposes. The circuit inherently provides two equal-amplitude outputs in phase quadrature, which lends itself to the operation of an economical type of tracking-filter system.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.
Learn more about the AES E-Library
Start a discussion about this paper!
