US6320825B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for recording compressed variable bitrate audio information
Assignee: US Philips Corp
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Filing: 1998-11-23
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Granted: 2001-11-20
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Expires: 2018-11-23
Abstract
Abstract A method for recording audio information on a record carrier, typically a bitstream signal on an optical disc, is disclosed. In the method the audio information is encoded to compressed audio data having a variable bitrate, in particular using lossless compression. The compressed audio data is recorded at a transfer speed which is controlled in dependence on the variable bitrate. A transfer speed profile ( 53, 54, 55 ) is determined for items of audio information, e.g. for each track on a CD, in which profile the average transfer speed is higher than an average transfer speed minimally required to transfer the compressed audio data of said item. Stuffing data is added to the compressed audio data according to the transfer speed profile, and transfer speed profile information is recorded on the record carrier for enabling playback at a transfer speed as indicated by the transfer speed profile information. Also a recording device, a record carrier and a playback device are disclosed.
Inventors
- 👤 Alphons A.M.L. Bruekers
- 👤 Wiebe De Haan
- 👤 Johannus L. Bakx
- 👤 Leon M. Van De Kerkhof
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:23
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/00007; G11B20/10; G11B27/00; G11B27/02; G11B27/031; G11B27/034; G11B27/10; G11B27/102; G11B27/105; G11B27/19; G11B27/28; G11B27/32; G11B27/327; G11B27/329; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2537; G11B2220/2545; G11B7/00; G11B7/004; G11B7/0045; G11B7/005
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
123 words
A method for recording audio information on a record carrier, the method comprising the steps of: encoding the audio information into compressed audio data having a variable bitrate; recording the compressed audio data at a transfer speed; and controlling the transfer speed depending on the variable bitrate including: determining a transfer speed profile for an item of audio information in which profile the average transfer speed is higher than an average transfer speed minimally required to transfer the compressed audio data of the item; adding stuffing data to the compressed audio data according to the transfer speed profile; and recording transfer speed profile information on the record carrier for enabling playback at a transfer speed as indicated by the transfer speed profile information.
Claim 2
Independent Claim
123 words
A method for recording audio information on a record carrier, the method comprising the steps of: encoding the audio information into compressed audio data having a variable bitrate; recording the compressed audio data at a transfer speed; and controlling the transfer speed depending on the variable bitrate including: determining a transfer speed profile for an item of audio information in which profile the average transfer speed is higher than an average transfer speed minimally required to transfer the compressed audio data of the item; adding stuffing data to the compressed audio data according to the transfer speed profile; and recording transfer speed profile information on the record carrier for enabling playback at a transfer speed as indicated by the transfer speed profile information.
Claim 3
Dependent Claim
50 words
The method of claim 1 , in which the recording at the transfer speed includes: storing the compressed audio data of at least part of the item in an edit buffer; and, after the determining the transfer speed profile, recording the contents of the edit buffer on the record carrier.
Claim 4
Dependent Claim
30 words
The method of claim 2 , in which the recording of the contents of the edit buffer on the record carrier occurs at a speed higher than the transfer speed.
Claim 5
Dependent Claim
141 words
A recording device for recording audio information on a record carrier, the device comprising: compression means for encoding the audio information into compressed audio data having a variable bitrate; recording means for recording the compressed audio data at a transfer speed; and control means for controlling the transfer speed depending on the variable bitrate and for determining a transfer speed profile for an item of audio information in which profile the average transfer speed is higher than an average transfer speed minimally required to transfer the compressed audio data of the item; and data combination means for adding stuffing data to the compressed audio data according to the transfer speed profile; and in which the recording means records transfer speed profile information on the record carrier for enabling playback at a transfer speed as indicated by the transfer speed profile information.
Claim 6
Dependent Claim
141 words
A recording device for recording audio information on a record carrier, the device comprising: compression means for encoding the audio information into compressed audio data having a variable bitrate; recording means for recording the compressed audio data at a transfer speed; and control means for controlling the transfer speed depending on the variable bitrate and for determining a transfer speed profile for an item of audio information in which profile the average transfer speed is higher than an average transfer speed minimally required to transfer the compressed audio data of the item; and data combination means for adding stuffing data to the compressed audio data according to the transfer speed profile; and in which the recording means records transfer speed profile information on the record carrier for enabling playback at a transfer speed as indicated by the transfer speed profile information.
Claim 7
Dependent Claim
87 words
A record carrier comprising: audio information encoded as compressed audio data having a variable bitrate; transfer speed information for controlling a transfer speed at playback, the transfer speed information including transfer speed profile information indicating the transfer speed at playback for an item of audio information, in which profile the average transfer speed is higher than an average transfer speed minimally required to transfer the compressed audio data of the item; and stuffing data in addition to the compressed audio data, according to the transfer speed profile.
Claim 8
Dependent Claim
87 words
A record carrier comprising: audio information encoded as compressed audio data having a variable bitrate; transfer speed information for controlling a transfer speed at playback, the transfer speed information including transfer speed profile information indicating the transfer speed at playback for an item of audio information, in which profile the average transfer speed is higher than an average transfer speed minimally required to transfer the compressed audio data of the item; and stuffing data in addition to the compressed audio data, according to the transfer speed profile.
Claim 9
Dependent Claim
19 words
The record carrier of claim 5 , in which the transfer speed profile includes a fixed bitrate per item.
Claim 10
Dependent Claim
31 words
The record carrier of claim 5 , in which the transfer speed profile includes per item, at least one speed indicator of a bitrate at a specified time within the item.
Claim 11
Dependent Claim
22 words
The record carrier of claim 5 , in which the transfer speed profile includes per item, at least one speed change indicator.
Claim 12
Dependent Claim
35 words
The record carrier of claim 5 , in which: the record carrier has a disc shape; and the transfer speed profile includes a rotation rate of the record carrier as an indication of the bitrate.
Claim 13
Dependent Claim
32 words
The record carrier of claim 5 , in which the record carrier includes a separate area and only the transfer speed profile is recorded in the separate area of the record carrier.
Claim 14
Dependent Claim
75 words
A playback device for retrieving from a record carrier, the device comprising: reading means for retrieving compressed audio data at a transfer speed; control means for controlling the transfer speed; and data selection means for retrieving transfer speed profile information from the record carrier and for removing stuffing data from the data retrieved; and in which the control means sets the transfer speed for an item of audio information according to the transfer speed profile.
Claim 15
Dependent Claim
75 words
A playback device for retrieving from a record carrier, the device comprising: reading means for retrieving compressed audio data at a transfer speed; control means for controlling the transfer speed; and data selection means for retrieving transfer speed profile information from the record carrier and for removing stuffing data from the data retrieved; and in which the control means sets the transfer speed for an item of audio information according to the transfer speed profile.
Claim 16
Dependent Claim
25 words
The playback device of claim 11 , in which the device further comprises de-compression means for decoding the compressed audio data having the variable bitrate.
Claim 17
Dependent Claim
33 words
The playback device of claim 11 in which: the carrier is a disc-shaped record carrier; and the control means calculates a rotation rate for the record carrier depending on the transfer speed profile.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-11-19 | 2005-05-21 | 2005-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-11-19 | 2009-05-21 | 2009-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-11-19 | 2013-05-21 | 2013-11-20 | $7700.00 | Window Closed / Lapsed |