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AssigneeKoninklijke Philips Electronics N.V.
InventorsJacobus P. J. Heemskerk, Jakob G. Nijboer, Joost J.J. Bekkers
Estimating the term…
Method of registering a running time on an information carrier, the information carrier comprising main data and subcode data, the running time being indicated in a subcode channel by a subcode time expressed in accordance with a predetermined format. A pseudo-running time is described by incrementing the subcode time in accordance with a pseudo-tempo, which is different from an actual tempo, the actual tempo representing a tempo in accordance with the actual running time. The invention further relates to an information carrier and an apparatus.
A method of registering a running time on an information carrier, the information carrier comprising main data and subcode data, the running time being indicated in a subcode channel by a subcode time expressed in accordance with a predetermined format, characterized in that a pseudo-running time is described by incrementing the subcode time in accordance with a pseudo-tempo, which is different from an actual tempo, the actual tempo representing a tempo in accordance with the actual running time.
A method of registering a running time of an information carrier, the running time being described by a subcode time in a subcode channel, the subcode time being expressed in minutes, seconds and frames, a number of bits for expressing the number of minutes of the subcode time being available in the subcode channel, characterized in that the number of bits is increased by using bits which are present in fields of the subcode channel, the field having a predefined purpose which is different from that for expressing the minutes of the subcode time.
An information carrier comprising main data, subcode data and tracks in which information is stored, the information carrier further comprising information about a running time of the information carrier, the running time being indicated in a subcode channel by a subcode time expressed in accordance with a predetermined format, characterized in that a pseudo-running time is described by incrementing the subcode time in accordance with a pseudo-tempo, which is different from an actual tempo, the actual tempo representing a tempo in accordance with the actual running time.
Information carrier for recording and storing main data and subcode data in tracks, the information carrier further comprising a pre-groove in which information about a running time indicated by a subcode time and a pre-groove time is stored, both the subcode time and the pre-groove time being expressed in accordance with a predetermined format, characterized in that a pseudo-running time is described in the pre-groove by incrementing the subcode time in accordance with a pseudo-tempo, which is different from an actual tempo, the actual tempo representing a tempo in accordance with the actual running time.
An information carrier comprising main data, subcode data and tracks in which information is stored, the information carrier further comprising information about a running time of the information carrier, the running time being indicated in a subcode channel by a subcode time expressed in minutes, seconds and frames, a number of bits for expressing the number of minutes of the subcode time being available in the subcode channel, characterized in that the number of bits is increased by using bits which are present in fields of the subcode channel, the field having a predefined purpose which is different from that for expressing the minutes of the subcode time.
Information carrier comprising main data, subcode data and tracks in which information can be stored, the information carrier further comprising information about a running time indicated by a subcode time stored in a pre-groove, the subcode time being expressed in minutes, seconds and frames, a number of bits for expressing the number of minutes of the subcode time being available in the subcode channel, characterized in that the number of bits is increased by using bits which are present in fields of the subcode channel, the field having a predefined purpose which is different from that for expressing the minutes of the subcode time.
An apparatus for reading an information carrier, comprising a system for detecting and reading information stored on the information carrier, the system comprising detection means and read-out means for receiving detector signals, the read-out means being arranged to retrieve a subcode time, characterized in that the read-out means are further arranged to detect a control code indicating the presence of a subcode time which is incremented in accordance with a pseudo-tempo, which is different from an actual tempo, the actual tempo representing a tempo in accordance with the actual running time.
An apparatus for recording an information carrier, comprising write means for inducing a detectable change on a layer of the information carrier, the write means being arranged to write a subcode time on the information carrier, which subcode time is incremented in accordance with an actual tempo, the actual tempo representing a tempo in accordance with the actual running time, characterized in that the write means are further arranged to write a subcode time on the information carrier which subcode time is incremented in accordance with a pseudo-tempo which is different from an actual tempo.
Dependencies are inferred from the claim text.
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Used signal is digitally coded: time code signal
Used signal is digitally coded: subcodes
Information storage based on relative movement between record carrier and transducer
Term end not estimated
The invention relates to a method of registering a running time on an information carrier, the information carrier comprising main data and subcode data, the running time being indicated in a subcode channel by a subcode time expressed in accordance with a predetermined format.
The invention also relates to a method of registering a running time of an information carrier, the running time being described by a subcode time in a subcode channel, the subcode time being expressed in minutes, seconds and frames, a number of bits for expressing the number of minutes of the subcode time being available in the subcode channel.
The invention further relates to an information carrier comprising main data, subcode data and tracks in which information is stored, the information carrier further comprising information about a running time of the information carrier, the running time being indicated in a subcode channel by a subcode time expressed in accordance with a predetermined format.
The invention will be further described in the following Figure description in which
FIG. 1 shows the general data format of the channel Q,
FIG. 2 shows a first embodiment of the invention,
The data format of channel Q is given in FIG. 1. In order to explain this Figure, some background information about this channel is given first.
A substantial amount of information is added to the data before the compact disc is recorded. After applying the so-called CIRC encoding, well known to a person skilled in the art, control words are added to the data. One 8-bit control & display word is added to every 32-symbol block of data (a symbol is an 8-bit word). The standard format description of the Compact Disc defines eight additional channels of information or subcodes that can be added to the music information; these subcodes are called, P, Q, R, S, T, U, V, W. The invention as described is related to the Q-channel. More detailed information about the use of the other subcode channels can be found in International Standard IEC 908.
The Q-channel is used for control purposes of more sophisticated players. The decoding of this channel can be implemented with a μ-computer. Items like track number and time are encoded in channel Q. Each subcode word is 98 bits long, so that 98 frames must be read from the disc to read a complete subcode word. The data format of channel Q is given in FIG. 1.