US 4,503,553 A · Loudspeaker system

Abstract

The disclosure relates to an audio signal reproduction system having one or more of the following features: (1) a loudspeaker having (a) a flat frequency response and (b) a predetermined power response; (2) two loudspeakers adapted to be positioned relative to one another so that they reproduce a stereophonic image substantially independent of the listener's position along a listening line spaced from the loudspeakers and nonintersecting a line extending between the two speakers; (3) an improved cross-over network having a substantially constant input impedance as a function of frequency; (4) a power sensor for sensing the power applied to a transducer so that audio signals are transmitted over a first signal path through the system when the sensed power is above a predetermined minimum level, and over a second path when the sensed power falls below the minimum level; (5) a power monitoring circuit to prevent a loudspeaker driver from being overdriven; and (6) a circuit for substantially balancing the signal energy levels between two audio channels over a long period of time.

Claims29

Dependent claims

A loudspeaker system comprising:

a plurality of loudspeaker drivers for producing sonic signals in response to electrical driving signals, at least two of said loudspeaker drivers each producing sonic signals substantially within the same frequency range;
means for mounting said loudspeaker drivers in a predetermined spatial array so that at least two of said drivers producing sonic signals substantially within the same frequency range are angularly spaced with respect to one another about a central axis;
and
means for modifying the frequency and phase responses of at least two of said loudspeaker drivers producing sonic signals substantially within the same frequency range relative to one another so that said array of loudspeaker drivers produces a combined predetermined radiation dispersion pattern around said central axis in response to said electrical driving signals.

1 more element

A loudspeaker system for reproducing a stereophonic image within a predefined space, said loudspeaker system comprising:

at least two loudspeakers, each of said loudspeakers including (1) a plurality of loudspeaker drivers for producing sonic signals in response to electrical driving signals, at least two of said loudspeaker drivers each producing sonic signals substantially within the same frequency range, (2) means for mounting said loudspeaker drivers in a predetermined spatial array so that at least two of said loudspeaker drivers producing sonic signals substantially within the same frequency range are angularly spaced with respect to one another about a central axis, and (3) means for modifying the frequency and phase responses of at least two of said loudspeaker drivers producing sonic signals substantially within the same frequency range relative to one another so that said array of loudspeaker drivers produces a combined predetermined radiation pattern around said central axis in response to said electrical driving signals;
wherein the radiation dispersion pattern of said two loudspeakers complement one another so that when said loudspeakers are positioned within said predefined space in a preselected orientation, said loudspeakers reproduce said stereophonic image within said predefined space in response to said driving signals substantially independent of the listener's position within said predefined space along a listening line spaced from the loudspeakers and nonintersecting a line extending between said loudspeakers.

Dependencies are inferred from the claim text.

Loudspeaker system

Life of this patent

Loudspeaker system

Life of this patent

Abstract

Claims29