Apparatus and method of retrieving a message from a digital audio tape
First Claim
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1. A method for searching a digital audio tape (DAT) for a message, the steps comprising:
- a) creating a bit map table that writes a "1" bit for audio and a "0" bit for the absence of audio on a digital audio tape,b) storing the bit map table in a memory,c) scanning the memory to find a predetermined number of 0 bits in sequence,d) scanning the portion of the memory adjacent to the predetermined number of 0 bits,e) determining if a predetermined number of 1 bits adjacent to the predetermined number of 0 bits, andf) identifying such combination of 0 bits and 1 bits as a message.
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Abstract
A scheme has been devised for retrieving audio from a digital audio tape (DAT) that has been used in a device such as a digital audio logger wherein audio is recorded on a intermittent basis. An audio bit map is created on the DAT that represents a record of activity with a "1" bit representing audio and a "0" bit representing absence of audio. The channels of the logger can be searched for a next message or previous message. A predetermined sequence of "1'"'"'s" and "0'"'"'s" are used in the search for identifying a message.
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Citations
20 Claims
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1. A method for searching a digital audio tape (DAT) for a message, the steps comprising:
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a) creating a bit map table that writes a "1" bit for audio and a "0" bit for the absence of audio on a digital audio tape, b) storing the bit map table in a memory, c) scanning the memory to find a predetermined number of 0 bits in sequence, d) scanning the portion of the memory adjacent to the predetermined number of 0 bits, e) determining if a predetermined number of 1 bits adjacent to the predetermined number of 0 bits, and f) identifying such combination of 0 bits and 1 bits as a message. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9)
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3. The method of claim wherein the tape is scanned in the reverse direction and a previous message is sought.
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10. A method for searching for a message on a digital audio tape (DAT) that has the capability of receiving audio from a plurality of channels when recording in a digital audio logger, the steps comprising:
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a) recording audio in a primary portion of the DAT, b) creating a bit map table in a secondary portion of the DAT that identifies the presence and absence of audio on a plurality of channels, c) scanning the bit map table to find the presence of a message in the primary portion, and d) playing the message. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. Apparatus for searching a digital audio tape (DAT) for a message, the steps comprising:
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a) means creating a bit map table that writes a "1" bit for audio and a "0" bit for the absence of audio in sequence, b) means for storing the bit map created by said creating means in a memory, c) means for scanning said memory to find a predetermined number of 0 bits in sequence, d) means for scanning the portion of said memory adjacent to a predetermined number of 0 bits, e) means for determining a predetermined number of 1 bits adjacent to the predetermined number of 0 bits, and f) means for identifying said combination of 0 bits and 1 bits as a message. - View Dependent Claims (18, 19)
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20. Apparatus for searching for a message on a digital audio tape (DAT) that has the capability of receiving audio from a plurality of channels and recording the received audio in a digital audio logger, the steps comprising:
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a) means for recording audio in a primary portion of the DAT, b) means for creating a bit map table in a secondary portion of the DAT that identifies the presence and absence of audio on a plurality of channels, c) means for scanning the bit map table to find the presence of the next message in the primary portion, and d) means for playing said message.
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Specification