Center Point Stereo System Time Delay Alignment
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Solution Overview
Problem
Conventional center point stereo systems suffer from diminished stereophonic imaging due to lateral displacement of sideways-directed speaker cones from the longitudinal reference line, causing misalignment of sound wave fronts and a loss of the center point stereophonic image.
Innovation Solution
Incorporation of a digital transducer alignment sound processor unit with an audio time delay circuit to compensate for the lateral displacement of sideways-directed speakers, ensuring time alignment of sound waves emanating from the center point, utilizing a digital transducer alignment sound processor with an ADAU1701 SigmaDSP and generating a time delay to reposition the sound radiating in the time domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If sideways-directed speaker cones are laterally displaced from the longitudinal reference line, then the stereo system can achieve a compact cabinet design, but the sound wave fronts become misaligned and the center point stereophonic image is diminished
Solution Approach 1:
The patent applies preliminary action by introducing a time delay to the sideways-directed speakers before they emit sound. This pre-compensation for the lateral displacement ensures that sound waves from all speakers arrive at the listener's position simultaneously, maintaining accurate stereophonic imaging despite the compact cabinet design that requires lateral speaker placement
2Measurement precision
If sideways-directed speakers are co-located at the center point, then the stereophonic image is improved, but the sound source origin and wave fronts are no longer time aligned
Solution Approach 1:
The patent changes the time parameter of the audio signal by introducing a delay specifically to the sideways-directed speakers. This parameter adjustment compensates for the extra distance sound must travel from laterally displaced speakers, ensuring that all sound waves arrive at the listener simultaneously and maintaining accurate stereophonic imaging
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly enhances the center point stereophonic sound imaging effect by ensuring time alignment of sound waves, thereby improving the overall audio experience by maintaining the intended stereophonic image.
Implementation Method 1
a digital transducer alignment sound processor unit including an audio time delay circuit that compensates for the lateral displacement of the sideways-directed speakers from the longitudinal reference line and the resulting time it takes the sound source to travel from the center point of the forward-directed loudspeaker to the front face of the sideways-directed speaker cones
Data Source
AI summary
In an audio processing system a center point stereo sound processor in combination with a digital transducer alignment sound processor converts regular left and right stereo audio source signals to sum and difference signals, enabling a center stage spatialized stereo acoustic image to be created directly from a forward-directed loudspeaker unit and a sideways-directed dipole loud speaker unit. The forward-directed loudspeaker unit includes one vertically-mounted loudspeaker. The sideways-directed dipole loudspeaker unit is located directly below and to the sides of the forward-directed loudspeaker unit and includes two speaker cones connected in parallel and wired out of phase with each other. The center point stereo sound processor receives a left and right, stereo, audio signal source and converts the left and right signals into sum and difference signals. The sum, left plus right signal drives the forward-directed loudspeaker unit. The difference, left minus right signal is subsequently processed by the digital transducer alignment sound processor, which then drives the sideways-directed dipole loudspeaker unit. The digital transducer alignment sound processor applies an audio time delay to the difference signal equal to or longer than that of the delay in sound transmission delay in air from the vertically-mounted loudspeaker of the forward-directed loudspeaker unit to the two speaker cones of the sideways-directed dipole loudspeaker unit. This acoustically repositions the sideways-directed dipole loudspeaker unit so it radiates in the time domain as if the sideways-directed dipole loudspeaker unit was centrally located in reference to the forward-directed loudspeaker unit.