Reproduction Process Device DSD Head Omission Control
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Solution Overview
Problem
USB-DAC devices experience 'head omission' when reproducing music data in the DSD format due to unstable output levels and muting operations, leading to noise and incomplete playback of music data.
Innovation Solution
A reproduction process device that acquires the sampling rate of content data, notifies the external reproducing device, outputs soundless data for a predetermined time to stabilize the output level, and then reproduces the content data, preventing muting issues and ensuring complete playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the USB-DAC performs muting operation to stabilize output level after reproduction stop, then noise is reduced, but head omission occurs at the beginning of reproduction
Solution Approach 1:
The storage device outputs soundless data (preliminary action) before outputting the actual music data. This preliminary soundless data fills the time period during which the USB-DAC performs its muting operation, ensuring that when the music data begins, the USB-DAC is already stable and ready to reproduce without head omission.
Solution Approach 2:
Soundless data acts as an intermediary element between the reproduction stop state and the actual music data. This intermediary fills the gap created by the USB-DAC's muting operation, allowing smooth transition without causing head omission or audible noise.
2Reliability
If the USB-DAC outputs sound immediately after reproduction stop, then complete playback is maintained, but noise is generated due to unstable output level
Solution Approach 1:
The storage device proactively outputs soundless data in advance to occupy the time period during which the USB-DAC stabilizes its output level. This prevents the USB-DAC from generating noise while maintaining continuous data flow for complete playback.
3Reliability
If soundless data is inserted at the beginning of music data, then head omission is prevented, but reproduction time is extended
Solution Approach 1:
The soundless data is extracted as a separate, distinct element from the actual music data. The storage device outputs this soundless data portion and then outputs the music data portion, allowing the USB-DAC to process them separately. This extraction approach minimizes the impact on overall reproduction time while still preventing head omission.
Data Source
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AI summary
There is provided a reproduction process device including an input unit which receives a reproduction instruction of content data, and a reproducing unit which outputs the content data to an external reproducing device based on the reproduction instruction received by the input unit. The reproducing unit includes an acquiring unit which acquires a sampling rate of the content data which is an object of the reproduction instruction, as a first sampling rate, a notifying unit which notifies the first sampling rate to the external reproducing device, and a data control unit which outputs reproduction start notification data to the external reproducing device after notifying the first sampling rate, then outputs soundless data corresponding to a predetermined length of time to the external reproducing device, and thereafter, outputs the content data to the external reproducing device.