Method and apparatus for CD format decision
AssigneeThomson Licensing
InventorsSai Fan Chan, Tak Wing Lam
Life of this patent
Estimating the term…
Abstract
A method for determining the format of an optical recording medium (1) comprising one or more data or audio tracks or both types of tracks is proposed, the method being robust against partially corrupted data on the recording medium. The method comprises the steps of: reading (101) the table of contents (TOC); storing information from the table of contents; checking (102, 103, 105) whether all tracks are indicated as audio tracks or as data tracks or whether both audio tracks and data tracks are present; if one or more data tracks are present, checking (104, 106, 107) whether the first indicated data track contains any audio information; and determining the format according to the results of the checking steps (102-107).
Claims14
A method for determining the format of an optical recording medium (1) comprising a table of contents (TOC) and one or more data or audio tracks or both types of tracks, the method comprising the steps of:
- reading (101) the table of contents (TOC);
- storing information from the table of contents;
- checking (102, 103, 105) whether all tracks are indicated as audio tracks or as data tracks or whether both audio tracks and data tracks are present;
- if one or more data tracks are present, checking (104, 106, 107) whether the first indicated data track contains any audio information;
- and
- determining the format according to the results of the checking steps (102-107).
A method for determining the format of a data storage medium comprising information about the stored data and one or more data units of at least a first and a second type, the method comprising the steps of:
- reading the information about the stored data;
- checking whether all data units are indicated as being the first type or as being the second type or whether both first type and second type data units are present;
- if one or more data units of the second type are present, checking whether the first indicated data unit of the second type contains any data of the first type;
- and
- determining the format according to the results of the checking steps.
A decision engine (3) for determining the format of an optical recording medium (1) comprising a table of contents (TOC) and one or more data or audio tracks or both types of tracks, the decision engine (3) comprising an input (7) for receiving information read from the recording medium (1), a first analyser (4) for storing and analysing the information stored in the table of contents (TOC) of the recording medium (1), a second analyser (6) for analysing the information stored in the tracks of the recording medium (1), a decision logic (5) for determining the format based on the output of the first and the second analyser (4, 6), a first output (8) for emitting a signal requesting further information to be read from the recoding medium (1), and a second output (9) for emitting a signal indicating the format.
10 A decision engine (3) according to claim 9, characterized in that the second analyser (6) performs a statistical sub-code analysis along the tracks.
Dependencies are inferred from the claim text.