Wireless Acoustic Profiling for Multichannel Audio Calibration
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Solution Overview
Problem
Existing multi-channel audio devices require a dedicated measurement microphone and additional processing capabilities to set acoustic profile information, increasing cost and complexity.
Innovation Solution
A wireless recording and reproducing device, such as a smart speaker or tablet PC, is used as a measurement microphone to record and reproduce test signals, generating acoustic profile information without the need for a dedicated microphone or additional processing in the multi-channel audio device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dedicated measurement microphone is attached to the multi-channel audio device, then acoustic profile information can be measured and set for each channel, but the device cost and complexity increase
Solution Approach 1:
The patent introduces a wireless recording and reproducing device as an intermediary between the multi-channel audio device and the acoustic profile measurement process. This external device performs the measurement function without being integrated into the audio device itself, allowing the audio device to remain simple while still achieving accurate acoustic profile measurement through the intermediary's microphone and processing capabilities
Solution Approach 2:
The measurement function is extracted from the multi-channel audio device and placed in a separate wireless recording and reproducing device. The audio device only sends test signals, while the wireless device captures acoustic profiles using its own microphone and processing unit, thereby reducing the complexity and cost of the original audio device while maintaining measurement capability
2Measurement precision
If the multi-channel audio device performs acoustic profile measurement and processing, then acoustic profile information can be generated, but the processing capability and cost of the audio device increase
Solution Approach 1:
The acoustic profile measurement and processing functions are extracted from the multi-channel audio device and transferred to the wireless recording and reproducing device. The audio device simply outputs test signals through its speakers, while the wireless device performs all measurements and generates acoustic profile information using its own processing capabilities, thereby reducing the processing burden and cost of the audio device
Solution Approach 2:
The wireless recording and reproducing device creates a copy of the acoustic measurement and processing function that replicates what would otherwise need to be built into the audio device. This copy performs the same measurements and calculations using the wireless device's microphone, processor, and memory, eliminating the need for the audio device to include these complex functions
3Measurement precision
If a dedicated measurement microphone is connected by cord, then acoustic measurements can be performed, but the operation becomes troublesome
Solution Approach 1:
The patent replaces the mechanical connection system (physical cord connection between microphone and audio device) with a wireless communication system. The wireless recording and reproducing device connects to the audio device via wireless signal transmission, eliminating the need for physical cables and complex connection procedures, thereby significantly improving ease of operation while maintaining full measurement functionality
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
Acoustic profile information is generated simply and cost-effectively without increasing the device's cost or complexity, using a wireless device for measurement and processing separately.
Implementation Method 1
a wireless recording and reproducing device... is placed as a measurement microphone at a listening point... records, as channel reproduction data, the test signal output from the multi-channel audio device through a speaker corresponding to this designated channel
Implementation Method 2
the wireless recording and reproducing device reproduces the source sound of the test signal and records this reproduced source sound as source sound reproduction data without externally outputting this reproduced source sound from the speaker
Implementation Method 3
the acoustic profile information generating device compares the channel reproduction data and the source sound reproduction data to each other to measure a delay time and an attenuation rate of the channel reproduction data with respect to the source sound reproduction data
Data Source
AI summary
[Problem] To generate acoustic profile information using a simple operation and without increasing the cost of a multichannel audio device. [Solution] A wireless recording playback terminal 5 is positioned at a listening point of a multichannel audio device 2 as a measuring microphone. The wireless recording playback terminal 5 records, as channel playback data in accordance with a test signal playback command received from the multichannel audio device 2, a test signal outputted from a speaker 3 that corresponds to the channel designated by the command. The wireless recording playback terminal 5 also plays back the sound source of the test signal and records the played-back sound source as sound source playback data without being outputted to the outside from the speaker. An acoustic profile information generation server 4 compares these playback data to measure the delay time and attenuation rate of the channel playback data with respect to the sound source playback data, generates the acoustic profile information of the designated channel on the basis of the result of this measurement, and sets the generated acoustic profile information to the multichannel audio device 2.