Audio Multi-Standard Detection Chip for TV Broadcasting
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Solution Overview
Problem
Current TV signal receiving apparatuses require dedicated circuit designs for each audio broadcasting standard, limiting their functionality to specific regions and necessitating multiple chip designs, which complicates development and maintenance.
Innovation Solution
An audio multi-standard detection apparatus and method that pre-records carrier bands for various audio broadcasting formats, using a carrier calculation unit and switch controller to identify the appropriate format by comparing calculated carrier energies with pre-recorded values, allowing a single decoding chip to adapt to different systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated circuit designs are employed for each audio broadcasting signal format, then the decoding accuracy and reliability are improved, but the device complexity and manufacturing cost increase due to multiple chip designs
Solution Approach 1:
The patent implements a universal audio detection chip that can identify multiple audio broadcasting formats (A2, EIAJ, BTSC, NICAM) through a single integrated device. The chip uses a standardized detection process that scans for carrier frequencies and identifies the audio format regardless of the broadcasting standard, eliminating the need for multiple dedicated circuit designs while maintaining accurate decoding capability across all formats.
Solution Approach 2:
The patent changes the detection approach from format-specific circuit design to parameter-based identification. Instead of dedicated circuits for each format, the system scans for carrier frequency parameters (4.5MHz, 5.5MHz, 6MHz, 6.5MHz) and other signal characteristics to dynamically identify the audio format. This parameter-driven approach allows a single chip to adapt to different broadcasting standards by detecting and responding to specific frequency parameters.
2Reliability
If dedicated circuit designs are employed for each audio broadcasting signal format, then the decoding reliability is improved, but the adaptability to different regions and broadcasting systems deteriorates
Solution Approach 1:
The detection chip is designed with universal functionality to support audio broadcasting formats from multiple regions including Japan (EIAJ), United States (BTSC), Europe and China (NICAM and A2). The chip automatically detects the regional format through carrier frequency scanning and adapts its decoding process accordingly, providing both regional adaptability and decoding reliability through a single unified device.
Solution Approach 2:
The patent implements a dynamic detection and adaptation mechanism where the chip continuously scans for carrier frequencies and automatically adjusts its decoding parameters based on the detected audio format. This dynamic approach allows the system to adapt to different regional broadcasting standards in real-time without requiring pre-configuration or hardware modifications, maintaining both reliability and versatility.
3Measurement precision
If multiple chip designs are created for different TV audio standards, then the decoding precision for each standard is improved, but the manufacturing cost and development burden increase
Solution Approach 1:
The patent merges the functionality of multiple format-specific detection chips into a single integrated audio detection chip. The unified chip incorporates detection capabilities for all major audio broadcasting formats (A2 with its five standards, EIAJ, BTSC, and NICAM with its four standards) within one device, reducing manufacturing complexity and cost while maintaining precise detection capability through integrated carrier frequency scanning and format identification circuits.
4Measurement precision
If dedicated circuit designs are used for each audio format, then the decoding accuracy is improved, but the product maintenance difficulty increases
Solution Approach 1:
The universal detection chip consolidates all audio format detection and decoding functionality into a single standardized component. This eliminates the need for manufacturers to maintain multiple region-specific chip designs, simplifying the supply chain and maintenance procedures. The standardized interface and unified detection algorithm reduce technical complexity for service personnel while maintaining high decoding accuracy across all supported formats.
Data Source
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AI summary
An audio multi-standard detection apparatus is provided to pre-record a plurality of audio broadcasting format carrier bands. The detection apparatus includes: a carrier calculation unit and a switch controller. The carrier calculation unit is used for receiving an intermediate frequency signal and calculates the first carrier energy of the intermediate frequency signal in each of the frequency bands. From this first carrier energy, the switch controller determines which frequency bands are existed in the intermediate frequency signal, then analyzes the signal via at least one threshold value to determine the frequency band's primary carrier. The switch controller obtains an effective carrier. Further, the switch controller compares the effective carrier with the pre-recorded carrier bands for selectively outputting the appropriate audio broadcasting format. Hence, the present invention achieves the objective of determining the appropriate audio multi-standard and enables the support of broadcast systems in various countries with a single audio decoding chip.