1. A magneto-optical recording medium comprising a magneto-optical recording layer and an auxiliary magnetic layer, wherein a recorded magnetic domain of said magneto-optical recording layer is magnetically transferred to said auxiliary magnetic layer upon irradiation with a reproducing radiation, whereby a larger magnetic domain than said recording magnetic domain of said magneto-optical recording layer can be read back from said auxiliary magnetic layer at the time of reproduction by virtue of the magnetic characteristics of said auxiliary magnetic layer, and wherein said auxiliary magnetic layer comprises a stack including at least two sub-layers which are anti-ferromagnetically coupled through a non-magnetic metallic layer.
2. A recording medium according to claim 1, wherein said sub-layers both consist of a rare-earth transition-metal material.
3. A recording medium according to claim 1, wherein said sub-layers have substantially the same composition.
4. A recording medium according to claim 1, wherein said rare-earth transition-metal material comprises GdFeCo.
5. A recording medium according to claim 1, wherein said rare-earth transition-metal material comprises GdFe.
6. A recording medium according to claim 1, wherein said non-magnetic metallic layer is an Ru layer.
7. A recording medium according to claim 6, wherein said Ru layer has a thickness ranging from 0.5 nm to 1.5 nm.
8. A recording medium according to claim 6, wherein said Ru layer has a thickness of about 0.9 nm.
9. A recording medium according to any one of claim 1, wherein the Kerr rotation or ellipticity of the recording stack has a larger magnitude for the antiparallel than for the parallel orientation of the sublayer magnetizations.
10. A recording medium according to claim 1 wherein the storage layer and the auxiliary layer are coupled over a non-magnetic interlayer.
11. A recording medium according to claim 1 wherein the auxiliary layer and the intermediate layer are coupled at least in a temperature range below the readout temperature by exchange interaction.
12. A method of manufacturing a magneto-optical recording medium comprising a magneto-optical recording layer and an auxiliary magnetic layer, wherein a recorded magnetic domain of said magneto-optical recording layer is magnetically transferred to said auxiliary magnetic layer upon irradiation with a reproducing radiation, whereby a larger magnetic domain than said recording magnetic domain can be read back from said auxiliary magnetic layer at the time of reproduction by virtue of the magnetic characteristics of said auxiliary magnetic layer, said method comprising the step of forming said auxiliary magnetic layer by generating at least two sub-layers which are anti-ferromagnetically coupled through a non-magnetic metallic layer.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A play back apparatus in which, according to a play back command from an operation section, the PCM audio data is generated from compression data in which the audio information is coded, and an audio is played back according to the PCM audio data,
said play back apparatus comprising:
a control section for conducting the control of each section of said apparatus according to each kind of commands from an operation section;
a compression decoder for decode processing the compression data, generating the PCM audio data, and successively outputting thereof;
a first storage section for successively renewing the temporarily stored data successively generated according to the PCM audio data and temporality storing thereof, and appropriately repeatedly reading out the temporarily stored data which is temporarily stored, and successively outputting thereof; and
a switching section for selecting either one of the PCM audio data successively outputted from said compression decoder or the temporarily stored data stored in said first storage section, and outputting thereof, wherein
when a quick traverse playback command or quick returning play back command is given by said operation section, said control section controls said switching section and selectively outputs the temporarily stored data stored in said first storage section.
2. The play back apparatus according to claim 1, wherein
the temporarily stored data includes the PCM audio data to play back the special audio in which the quick traverse play-back audio of the audio information, or the quick returning play-back audio is converted into an imitation sound.
3. The play back apparatus according to claim 1, wherein
the temporarily stored data includes the data obtained by extracting the PCM audio data outputted from said compression decoder at a predetermined interval.
4. The play back apparatus according to claim 1, wherein
said first storage section includes a predetermined number of storage addresses, and successively reads in the temporarily stored data successively generated according to the PCM audio data successively outputted from said compression decoder, and successively stores in the address specified by said control section.
5. The play back apparatus according to claim 1, wherein
when the quick traverse play back command is given by said operation section, the temporarily stored data stored in said first storage section is repeatedly read out in the stored order and successively outputted as the output data.
6. The play back apparatus according to claim 1, wherein
when the quick returning play back command is given by said operation section, the storing temporarily stored data is repeatedly read out in the order reversed to the stored order, and successively outputted as the output data.
7. The play back apparatus according to claim 1, wherein
said control section controls in such a manner that, before the each kind of command is given from said operation section, said control section judges whether the temporarily stored data is already stored in said first storage section, and
when it is judged that the temporarily stored data is not yet stored in said first storage section, said control section makes the decode processing of the compression data by said compression decoder start, and generates the PCM audio data, and makes the PCM audio data successively output from said compression decoder, and makes the temporarily stored data generated according to the PCM audio data, temporarily stored in said first storage section.
8. The play back apparatus according to claim 1, further comprising:
a second storage section for storing the default data including the PCM audio data having a predetermined data amount, wherein
said control section controls in such a manner that, before each kind of command is given from said operation section, said control section judges whether the temporarily stored data is already stored in said first storage section, and
when it is judged that the temporarily stored data is not yet stored in said first storage section, the temporarily stored data according to the default data stored in said second storage section is read in said first storage section, and temporarily stored.
9. The play back apparatus according to claim 8, wherein
the default data includes the PCM audio data to play back the special audio in which the quick traverse play back audio, or the quick returning play back audio of the audio information is converted into an imitation sound.
10. A play back apparatus in which, according to a play back command from an operation section, the PCM audio data is generated from compression data in which the audio information is coded, and an audio is played back according to the PCM audio data,
said play back apparatus comprising:
a control section for conducting the control of each section of said apparatus according to each kind of commands from an operation section;
a compression decoder for decode processing the compression data, generating the PCM audio data, and successively outputting thereof;
a first storage means for successively renewing the temporarily stored data successively generated according to the PCM audio data and temporality storing thereof, and appropriately repeatedly reading out the temporarily stored data which is temporarily stored, and successively outputting thereof; and
a switching means for selecting either one of the PCM audio data successively outputted from said compression decoder or the temporarily stored data stored in said first storage means, and outputting thereof, wherein
when a quick traverse play back command or quick returning play back command is given by said operation section, said control section controls said switching means and selectively outputs the temporarily stored data stored in said first storage means.
11. The play back apparatus according to claim 10, wherein
the temporarily stored data includes the PCM audio data to play back the special audio in which the quick traverse play-back audio of the audio information, or the quick returning play-back audio is converted into an imitation sound.
12. The play back apparatus according to claim 10, wherein
the temporarily stored data includes the data obtained by extracting the PCM audio data outputted from said compression decoder at a predetermined interval.
13. The play back apparatus according to claim 10, wherein
said first storage means includes a predetermined number of storage addresses, and successively reads in the temporarily stored data successively generated according to the PCM audio data successively outputted from said compression decoder, and successively stores in the address specified by said control section.
14. The play back apparatus according to claim 10, wherein
when the quick traverse play back command is given by said operation section, the temporarily stored data stored in said first storage means is repeatedly read out in the stored order and successively outputted as the output data.
15. The play back apparatus according to claim 10, wherein
when the quick returning play back command is given by said operation section, the storing temporarily stored data is repeatedly read out in the order reversed to the stored order, and successively outputted as the output data.
16. The play back apparatus according to claim 10, wherein
said control section controls in such a manner that, before the each kind of command is given from said operation section, said control section judges whether the temporarily stored data is already stored in said first storage means, and
when it is judged that the temporarily stored data is not yet stored in said first storage means, said control section makes the decode processing of the compression data by said compression decoder start, and generates the PCM audio data, and makes the PCM audio data successively output from said compression decoder, and makes the temporarily stored data generated according to the PCM audio data, temporarily stored in said first storage means.
17. The play back apparatus according to claim 10, further comprising:
a second storage means for storing the default data including the PCM audio data having a predetermined data amount, wherein
said control section controls in such a manner that, before each kind of command is given from said operation section, said control section judges whether the temporarily stored data is already stored in said first storage means, and
when it is judged that the temporarily stored data is not yet stored in said first storage means, the temporarily stored data according to the default data stored in said second storage means is read in said first storage means, and temporarily stored.
18. The play back apparatus according to claim 17, wherein
the default data includes the PCM audio data to play back the special audio in which the quick traverse play back audio, or the quick returning play back audio of the audio information is converted into an imitation sound.