Perceptual Effects of Dynamic Range Compression in Popular Music Recordings - January 2014
Accurate Calculation of Radiation and Diffraction from Loudspeaker Enclosures at Low Frequency - June 2013
New Measurement Techniques for Portable Listening Devices: Technical Report - October 2013
The Polaroid Ultrasonic Ranging System
This paper will deal with the electronics and mechanics necessary to perform precise focusing of the camera lens of the Polaroid SX-70 Sonar Camera and the Prontol Sonar Camera. These cameras utilize ultrasonic sound waves to measure the distance to a subject and then convert this information into lens rotation to obtain the correct focus. The system is composed of an electrostatic transducer and three integrated circuits. The complete transmit, receive, and lens rotation to precise focus requires but a few tenths of a second. This unique system has proven extremely reliable compared to other distance measuring techniques.
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.