1. A data processing apparatus for processing data presented in the form of a vector representation, the apparatus being operable to represent direction of said vector as a sequence of successive accuracy increments using a set of vector codebooks of decreasing dimensions per accuracy increment.
2. Apparatus in accordance with claim 1 and including directional vector quantisation means operable to minimise chordal distance between said vector to be quantised and a vector of a codebook to be used at a particular accuracy increment.
3. Apparatus according to claim 2 and including error reduction means operable to reduce the dimension of an identified error vector by one, the identified error vector representing the direction of said chordal distance.
4. Apparatus according to claim 3 and including reconstruction coefficient calculating means operable to generate a reconstruction coefficient from which said vector can be reconstructed.
5. An encoder including data processing apparatus in accordance with claim 1.
6. A data processing apparatus for processing data presented in the form of vector reconstruction coefficients, the apparatus being operable to process said reconstruction coefficients such that successive coefficients reflect successive increments in accuracy from which a vector direction can be reconstructed.
7. A decoder including data processing apparatus in accordance with claim 6.
8. A wireless communications apparatus operable to emit a signal bearing data, said data being expressible in the form of one or more symbols from a predetermined symbol set, the apparatus comprising encoding means for encoding said symbols by means of spherical vector quantisation, said encoding means being operable to perform said encoding using a plurality of codebooks, each codebook being associated with a level of refinement of said encoding, and wherein successive levels of refinement are associated with a codebook of lower dimension than a preceding level of refinement.
9. A wireless communication apparatus operable to emit a signal bearing data, said data being expressible in the form of one or more symbols from a predetermined symbol set, the apparatus comprising encoding means for representing a vector as a linear combination of a basis set of orthogonal reference vectors, successively selected through vector quantisation from codebooks of decreasing dimensions, such that a truncated representation of the said vector by the first n components incurs a chordal distortion equal to the product of chordal distortions incurred by the first n vector quantisation operations.
10. A method of processing data presented in the form of a vector representation, comprising representing direction of said vector as a sequence of successive accuracy increments using a set of vector codebooks of decreasing dimensions per accuracy increment.
11. A method in accordance with claim 10 and including minimising chordal distance between said vector to be quantised and a vector of a codebook to be used at a particular accuracy increment.
12. A method in accordance with claim 11 and including reducing the dimension of an identified error vector by one, the identified error vector representing the direction of said chordal distance.
13. A method in accordance with claim 12 and including calculating a reconstruction coefficient from which said vector can be reconstructed.
14. A non-transitory computer readable storage medium carrying computer executable instructions operable to cause a computer to operate as an apparatus in accordance with claim 1.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A toner supplying apparatus, comprising:
a toner tank to hold toner, the toner tank having a toner supplying hole to discharge the toner;
a slide shutter disposed inside the toner tank so as to close the toner supplying hole, the slide shutter allowing the toner supplying hole to be opened when the toner tank is mounted in an image forming apparatus; and
a sealing member disposed on an outer circumference of the slide shutter to prevent the toner from leaking out through a gap between the slide shutter and the toner tank.
2. The apparatus as claimed in claim 1, further comprising:
a supplying part formed in a substantially cylindrical shape to guide movement of the slide shutter; and
an elastic member to elastically support the slide shutter.
3. The apparatus as claimed in claim 2, wherein the slide shutter comprises:
a body part formed in a substantially hollow cylindrical shape, the body part comprising a toner outlet; and
a front circular plate and a rear circular plate disposed at both ends of the body part, the front and rear circular plates having outer diameters corresponding to an inner diameter of the supplying part.
4. The apparatus as claimed in claim 3, wherein the slide shutter further comprises:
a guide part disposed on an outer circumference of the body part.
5. A toner supplying apparatus, comprising:
a toner tank to hold toner, the toner tank having a toner supplying hole to discharge the toner;
a supplying part formed inside the toner tank in a substantially hollow cylindrical shape to separate the toner supplying hole from the toner tank in which the toner is stored;
a slide shutter disposed inside the supplying part to close the toner supplying hole, the slide shutter allowing the toner supplying hole to be opened when the toner tank is mounted in an image forming apparatus;
an elastic member to elastically support the slide shutter so that the slide shutter returns to an original position to seal the toner supplying hole when the toner tank is separated from the image forming apparatus;
a toner conveying member extending from the inside of the toner tank to the inside of the slide shutter to convey the toner stored in the toner tank to the toner supplying hole; and
a sealing member disposed on an outer circumference of the slide shutter to prevent the toner from leaking out through a gap between the slide shutter and the supplying part.
6. A toner tank of a toner supplying apparatus detachably mounted in an image forming apparatus to supply toner, the toner tank comprising:
a supplying part to guide a slide shutter having a sealing member on an outer circumference thereof to slide along an inside surface of the supplying part; and
a toner supplying hole formed in the supplying part to discharge toner stored in the toner tank,
wherein the sealing member of the slide shutter seals the toner supplying hole when the toner supplying apparatus is separated from the image forming apparatus.
7. The toner tank as claimed in claim 6, wherein an elastic member to elastically support the slide shutter is disposed in the toner tank.
8. A slide shutter of a toner supplying apparatus detachably mounted in an image forming apparatus to supply toner, wherein:
the toner supplying apparatus comprises a supplying part in which a toner supplying hole to discharge toner is formed;
the slide shutter comprises a body part formed in a substantially hollow cylindrical shape, the body part having a toner outlet, and a front circular plate and a rear circular plate disposed at both ends of the body part, the front and rear circular plates having outer diameters corresponding to an inner diameter of the supplying part; and
the toner outlet faces the toner supplying hole of the supplying part when the toner supplying apparatus is mounted in the image forming apparatus.
9. The slide shutter as claimed in claim 8, wherein a sealing member is disposed on the body part to prevent the toner from leaking out through a gap between the slide shutter and the supplying part.
10. The slide shutter as claimed in claim 9, wherein an elastic member is disposed inside the supplying part to elastically support the slide shutter.
11. The slide shutter as claimed in claim 9, further comprising:
a guide part disposed on an outer circumference of the body part.
12. A sealing member of a toner supplying apparatus detachably mounted in an image forming apparatus to supply toner, wherein:
the toner supplying apparatus comprises a supplying part in which a toner supplying hole to discharge toner is formed, and
the sealing member, disposed on an outer circumference of a slide shutter to slide inside the supplying part, to allow the toner of the toner supplying apparatus to be discharged to the image forming apparatus when a toner outlet of the slide shutter faces the toner supplying hole, and to prevent the toner from leaking out through a gap between the supplying part and the slide shutter when the toner outlet of the slide shutter deviates from the toner supplying hole.
13. An elastic member of a toner supplying apparatus detachably mounted in an image forming apparatus to supply toner, wherein:
the toner supplying apparatus comprises a supplying part in which a toner supplying hole to discharge toner is formed, and
the elastic member, disposed inside the supplying part to elastically support a slide shutter, to enable a toner outlet of the slide shutter to face the toner supplying hole when the toner supplying apparatus is mounted in the image forming apparatus, and to enable a sealing member disposed on an outer circumference of the slide shutter to seal the toner supplying hole when the toner supplying apparatus is separated from the image forming apparatus.