Digital Broadcast Playback Using Stored Layer Switching Timing
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Solution Overview
Problem
Digital broadcast receivers with built-in HDDs face challenges in maintaining reception quality during mobile reception, leading to errors in recorded streams due to phasing, multi-path, or carrier-to-noise deterioration, making it impossible to switch between hierarchical layers effectively during recording and playback.
Innovation Solution
A digital broadcast receiving device with a reception means, analysis means, and record/reproduction means that analyzes signal quality and manages data streams to switch between hierarchical layers, allowing for accurate recording and playback of digital broadcasts, even in deteriorated reception conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital broadcast is received by a handheld terminal or mobile body using hierarchical transmission, then reception quality can be maintained through layer switching, but the timing for switching between hierarchical layers becomes unknown when recording to HDD, making successful playback impossible
Solution Approach 1:
The invention performs preliminary analysis of the received stream during recording to detect hierarchical layer switching points and stores this timing information together with the recorded content. When playback occurs, the stored switching timing information is retrieved and used to correctly switch between hierarchical layers, ensuring successful reproduction even though the original switching timing was unknown during recording.
Solution Approach 2:
The invention introduces an intermediary analysis process that examines the recorded stream to extract hierarchical layer switching timing information. This intermediary analysis acts as a bridge between the recording process and playback process, generating the necessary switching timing data that was lost during recording, thereby enabling successful playback.
2Quantity of substance
If recording is performed during mobile reception with deteriorated signal quality, then broadcast content can be stored, but errors occur in the received stream making error correction impossible
Solution Approach 1:
The invention performs preliminary analysis of the received stream during recording to detect errors and identify hierarchical layer switching points. By analyzing the stream structure in advance and storing both the content and associated metadata (including error locations and layer switching timing), the system prepares necessary information for accurate playback even when the original recording contained errors.
3Reliability
If hierarchical layer switching is performed during mobile reception, then reception quality improves, but the switching timing cannot be determined for recorded content playback
Solution Approach 1:
The invention enables the recorded content to essentially self-configure during playback by storing hierarchical layer switching timing information alongside the recorded stream. The playback system automatically retrieves this stored timing information and uses it to perform layer switching without requiring complex external control or manual intervention, thereby simplifying the switching control mechanism while maintaining high reception quality.
Data Source
AI summary
This invention relates to a digital broadcast receiver device capable of performing excellent reproduction equivalent to recording sessions in the case of receiving digital broadcast by handheld terminals or mobile/movable bodies, such as land vehicles, and then recording it in a storage device for reproduction. For example, when recording hierarchically transmitted digital broadcast on a recording medium, the reception quality is analyzed by a reception quality analyzer based on the information from a transmission path demodulator. A list generator generates a reception quality list from an analysis result from the reception quality analyzer and time information from a writing unit and then records it on the record medium. Upon playback from the record medium, the reception quality list is analyzed by a list analyzer. A selection instruction unit selects the optimum hierarchical service and then performs playback and display.