Abstract: This invention comprises a system to compensate for the noise level inside a vehicle by measuring the music level and the noise level in the vehicle through the use of analog to digital conversion and adaptive digital filtering, including a sensing microphone in the vehicle cabin to measure both music and noise; preamplification and analog to digital (A/D) conversion of the microphone signal; A/D conversion of a stereo music signal; a pair of filters that use an adaptive algorithm such as the known Least Mean Squares ("LMS") method to extract the noise from the total cabin sound; an estimation of the masking effect of the noise on the music; an adaptive correction of the music loudness and, optionally, equalization to overcome the masking effect; digital to analog (D/A) conversion of the corrected music signal; and transmission of the corrected music signal to the audio system.

Abstract: A multiple speaker loudspeaker of the type comprising a larger speaker including a larger frame and at least one smaller speaker including a smaller speaker support structure is provided with first and second rigid power conductors which are rigidly mounted both to the larger frame and to the smaller speaker support structure such that the power conductors support the smaller speaker permanently in place in front of the larger speaker. These power conductors are electrically interconnected both to the smaller speaker and to power input terminals of the loudspeaker such that the first and second power conductors conduct electrical audio signals from the input terminals to the smaller speaker.

Abstract: A cleaning tape for an apparatus of the type which includes a magnetic head and a drive mechanism for the head includes a cleaning member adapted to be moved past the magnetic head during a cleaning operation. The cleaning tape defines an array of raised surfaces, at least some of which are separated by smooth, low friction surfaces interposed therebetween. The raised surfaces and low friction surfaces are arranged such that both the raised surfaces and the low friction surfaces alternately come into contact with the magnetic head during a cleaning operation. The raised surfaces are effective to clean the magnetic head, and the low friction surfaces are effective to reduce friction between the cleaning member and the magnetic head to protect the drive mechanism against excessive frictional loading. A press forming method is disclosed for fabricating the cleaning tape.

Abstract: A cleaning device for cleaning contact-type information transducing heads is disclosed. The device has a substrate covered in part by a cleaning material and partly by a recording surface. A program is stored on the recording surface for directing the transducing head toward cleaning material for each cleaning operation. An embodiment is disclosed in which memory locations on the recording surface count the number of cleaning program executions, indicate specifically available cleaning areas and indicate when the cleaning device has been completely used.

Abstract: A disc cleaning device is disclosed which includes a disc support platform mounted to rotate about a first axis. This platform is adapted to support a disc to be cleaned and to center the disc to be cleaned about the first axis. An annular cleaning surface is mounted to rotate about a second axis spaced from the first axis. This cleaning surface is positioned to contact a disc to be cleaned supported on the platform. The platform and the cleaning surface are rotated such that the cleaning surface rotates at twice the angular velocity of the platform. The cleaning surface defines an effective radius equal to the separation between the first and second axes. It has been discovered that this geometry and arrangement of velocities ensures that relative movement between the cleaning surface and the disc to be cleaned is oriented substantially radially with respect to the first axis in order to provide a substantially radially oriented cleaning of at least an annular portion of the disc to be cleaned.

Abstract: A system for facilitating attachment of a loudspeaker grille to an adjacent structure. The invention includes a fastener with a square head which is shaped to be inserted within a head-receiving portion formed in the grille. The fastener is gripped on one pair of opposite sides between a pair of parallel, longitudinal guides. The other sides of the fastener are captured between an abutment and a depressable latch which is sufficiently flexible to permit insertion of the head thereover into the head-receiving portion.

Abstract: An automatic signal optimizing interface for connection between the antenna of an automobile radio receiver and the receiver itself processes the RF signal received by the antenna and provides an improved output signal to the automobile receiver which is optimized for distortion free reception. The output signal is limited to the desired frequency band to eliminate interfering signals, and is maintained within the optimum dynamic range of the receiver, even under reception conditions in which the received antenna signal itself is excessively high or undesirably low. The interface therefore permits superior performance by the radio receiver by optimizing the signal supplied to the radio and by preventing intermodulation distortion which otherwise commonly results from overloading of the front end of the radio receiver by excessively strong received signals.

Abstract: A loudspeaker diaphragm is disclosed which is formed of a slurry of cellulose fibers and polypropylene fibers. In the fabrication of the diaphragm, a felt is made of the slurry, and the felt is subjected to sufficient heat and pressure to fuse the polypropylene fibers together to form a skeleton or matrix which extends through the felt.

Abstract: A system for releasably attaching the grille of a loudspeaker directly to the rim of the loudspeaker. The system includes a plurality of latch members in the form of posts extending from the grille, each of the posts having an indentation including a cam and a plurality of latch-engaging portions located in the rim of the loudspeaker in registration with the posts. The latch-engaging portions each include an aperture shaped for penetration by the corresponding post. Locking means comprising a longitudinal slot and a cam receiver juxtaposed the slot is shaped to engage the indentation and cam and extends laterally from each aperture. The cam and cam receiver are correspondingly shaped such that less force is required to engage the cam and cam receiver then is required to disengage the same.

Abstract: A cleaning cassette for a tape unit includes a supply reel and a take-up reel, with a cleaning ribbon mounted therebetween. The cleaning ribbon extends around various support surfaces in the cassette, and passes two cleaning stations. The first cleaning station utilizes a spring biased plunger to force the cleaning ribbon against a pinch roller being cleaned. A traction sleeve is positioned between the capstan and the pinch roller to enhance the frictional engagement between the capstan and the pinch roller. At the second cleaning station, the cleaning ribbon passes between the capstan and the pinch roller. Once again, a traction sleeve is provided between the capstan and the pinch roller, and in this case the traction sleeve is offset with respect to the cleaning ribbon. Funnel-shaped openings and distribution channels are provided in the said shell to introduce a liquid such as a cleaning solvent onto the cleaning ribbon near the cleaning stations.

Abstract: A loudspeaker allowing snap-together assembly and extensive use of plastic is provided. The magnet is substantially enclosed between a molded plastic basket and a first lock member. Deformable fins aid in centering the magnet and in maintaining an annular gap between elements of the magnet. The base of the cone of the loudspeaker is frictionally held between the basket and a second lock member. The electrical connection between the voice coil and the input terminals includes conductive strips formed of conductive ink upon a centering disc. The conductive strips are soldered to the leads of the voice coil and are joined to the input terminals by pressure contacts of a terminal module added at final assembly. A bridge subassembly for mounting within the basket of the loudspeaker is provided to permit snap-together assembly of multiple loadspeaker systems. The electrical connections between the loudspeakers of the multiple loudspeaker system are made at final assembly by the terminal module.