Reflections, and the Boats of Acceptance A year ago I wrote Amsterdam Internationalabout 6 months after I had left the airport myself. I was writing with enough emotional distance from my darkest point a period of daily-tears-during-naptime, and racing-mind-while-lying-in-bed-at-night to speak somewhat clearly about that rough transitional time, but while the memories were still fresh and jagged enough to hopefully do them some justice. I hoped that it would spread, and reach others who were going through their own dark times. And then I watched, amazed, as it did.
The Farrell Law Firm, P. What is claimed is: The method of claim 1, wherein the restoring step comprises: Field of the Invention The present invention relates generally to a method and apparatus for restoring an audio stream, and in particular, to a method and apparatus for storing an Advanced Audio Coding AAC stream from an asynchronous audio Packetized Elementary Stream PES stream.
The PES stream is in turn segmented to a predetermined size and a header is attached to each segment streamthus creating TS Transport Stream packets. The TS packets form a TS stream Referring back to the PES streamt0 through t5 inserted at the start of the PCM frames in the PCM frame are time information values indicating when the audio information is to be represented in a decoder.
The time information is included in part of PES header data as time stamps. As noted from FIG. This method is called an asynchronous PES scheme, which offers the benefit of transmitting as much audio data as possible in TS packets.
But when the TS steam contains errors such as those included in packets andthe restored PES stream includes the corrupted PES data and The corrupted data and may include data field corresponding to an ADTS header. Discard of the corrupted PES data to prevent errors, causes a loss of the time information.
Further, the present invention provides an audio stream processing method and apparatus for optimally restoring an Advanced Audio Coding AAC frame from a PES packet corrupted by errors in an asynchronous audio PES stream. In addition, the present invention provides an audio stream processing method and apparatus for storing restored audio data in a syntaxically perfect structure so that stability can be ensured even when an audio stream is stored in an external device.
The above objects are achieved by providing a method and apparatus for processing an asynchronous audio stream. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
The audio stream processor includes an AAC stream restorera system audio stream generator and a ring buffer The PES stream may have corrupted data e. If a current PES includes a prefix frame the prefix frame e.
In stepit is determined whether the current PES packet has a residual frame. The prefix frame is more clearly illustrated with reference to FIG. Referring back to FIG. As illustrated with reference to FIG.
In the absence of a residual frame in stepit is determined whether the current PES packet is the first one in step The replacement can be performed in many ways. If a number of the at least one lost ADTS frame is greater than a predetermined value, the at least one lost ADTS frame is replaced with a predetermined one of the mute audio data and the white noise audio data and, if the number of the at least one lost ADTS frame is less than or equal to the predetermined value, the at least one lost ADTS frame is replaced with the normal audio data.
The header H includes time information. The system audio stream generator can include the original time information t0 through t5 illustrated in FIG.
As the system audio stream is stored in the ring bufferthe frames of the system audio stream are cyclically stored and read. The system audio stream stored in the ring buffer can be reproduced in an audio CODEC or recorded in a recorder Furthermore, when broadcasting is recorded in an error environment, it can be stored in files free of syntax errors.
Therefore, stability is provided to the system when the recorded audio data is reproduced.The Freedom Switch is a wireless switch that uses radio frequency to communicate with the host devic..
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