Ceiling Reflection Speaker Audio Timing for Better Localization
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Solution Overview
Problem
Listeners experience a loss of audio localization and connection with other channels when using ceiling reflection type speakers due to time lag caused by differing frequency bands in direct and reflected audio routes.
Innovation Solution
An audio processing device with a digital signal processor that performs low-pass filtering, high-pass filtering, and delay processing to compose delayed low-frequency and high-frequency components of digital audio signals, which are then converted to an analog signal for output to ceiling reflection type speakers, thereby addressing the time lag issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ceiling reflection type speaker is used to reduce cost, then manufacturing cost is reduced, but time lag between low and high frequency audio causes loss of sense of localization and connection
Solution Approach 1:
The audio signal is segmented into low frequency components and high frequency components using low-pass filter and high-pass filter respectively. This segmentation allows independent processing of each frequency component to compensate for the time lag caused by ceiling reflection, thereby maintaining sense of localization and connection while using cost-effective ceiling reflection type speakers.
Solution Approach 2:
Delay processing is applied preliminarily to the low frequency component before composition, anticipating the time lag that will occur during ceiling reflection. By pre-delaying the low frequency component to match the reflection time, the audio signal maintains proper temporal alignment between frequency components, preserving sense of localization and connection.
2Reliability
If low-pass filter and high-pass filter processing is applied to separate frequency components, then time lag can be compensated, but device complexity increases
Solution Approach 1:
The digital signal processor is designed to perform multiple functions including low-pass filter processing, high-pass filter processing, delay processing, and composition processing within a single integrated device. This multi-functionality enables comprehensive time lag compensation for ceiling reflection type speakers without requiring separate dedicated devices for each processing step, thereby managing device complexity effectively.
Data Source
AI summary
To resolve a problem that a listener feels that sense of localization and sense of connecting with the other channels are lost in case that the listener listens to an audio that is output from a ceiling reflection type speaker in an audio processing device that outputs an analog audio signal to speakers including the ceiling reflection type speaker that makes the audio reflect at a ceiling. A DSP 5 performs low-pass filter processing that extracts low frequency component from a digital audio signal, high-pass filter processing that extracts high frequency component from the digital audio signal, delay processing that delays the low frequency component of the digital audio signal that is extracted by the low-pass filter processing, and composition processing that composes the low frequency component of the digital audio signal that is delayed by the delay processing and the high frequency component of the digital audio signal that is extracted by the high-pass filter processing as audio signal processing.