Receiver Output Control Unit Logic Level Fixing
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Solution Overview
Problem
In digital broadcasting receivers, spurious emissions from the TS-output pin can cause erroneous synchronization and power wastage due to the high amplification factor and close pin distances in smaller LSI circuits, leading to unnecessary operation of subsequent circuits when no signal is received.
Innovation Solution
A receiving device with a synchronization detecting unit, demodulator-decoder unit, and output control unit that secures synchronization and fixes the logic level of the transport stream output if synchronization is not secured, preventing spurious emissions and power wastage by controlling the output based on synchronization status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the voltage of the TS-output pin is set at a higher voltage than the internal voltage to maintain interfaces with other LSI circuits, then the interface compatibility is improved, but the amplification factor becomes large causing spurious emissions
Solution Approach 1:
The patent introduces an output control unit as an intermediary between the demodulator-decoder unit and the external interface. This control unit buffers and conditions the transport stream output, allowing the internal low-voltage logic to interface with external high-voltage requirements without direct high-gain amplification, thereby reducing spurious emissions while maintaining interface compatibility
2Volume of moving object
If the chip size is made smaller to reduce cost and improve integration, then the manufacturing cost is reduced, but the distance between pins becomes narrower causing spurious emissions to be inputted into the tuner input pin
Solution Approach 1:
The patent extracts the harmful spurious emissions from the signal path by using the output control unit to filter and condition the transport stream output. This separation allows the compact chip design to maintain small size while preventing spurious coupling between the TS-output pin and tuner input pin through proper signal conditioning
3Reliability
If synchronous detection is performed on spurious-components mixed in through the tuner input pin, then synchronization is secured in the OFDM receiving demodulator unit, but the circuits operate erroneously causing wasteful power consumption
Solution Approach 1:
The patent applies preliminary action by using the output control unit to fix the logic level of the transport stream output when synchronization is not secured. This prevents spurious emissions from causing erroneous synchronization in the first place, avoiding the need for corrective actions and preventing wasteful power consumption from erroneous circuit operations
Data Source
AI summary
Provided is a receiver including a receiving unit, a demodulator-decoder unit, a synchronization detecting unit, and an output control unit. The receiving unit receives digital broadcasting. The demodulator-decoder unit obtains an output including a transport stream through a demodulating processing and a decoding processing performed on a reception signal received by the receiving unit. The synchronization detecting unit secures synchronization on the basis of the reception signal received by the receiving unit, and generates a timing signal to be used in the demodulating processing and in the decoding processing. The output control unit outputs the output including the transport stream from the demodulator-decoder unit if the synchronization is secured. The output control unit fixes a logic level of the output including the transport stream if the synchronization is not secured.