1. Receiver for simultaneously receiving first radio frequency signals according to a first standard and second radio frequency signals according to a second standard different from the first standard, the first frequency signals including first information and the second radio frequency signals including second information, the receiver comprising:
a first frequency translating stage for converting the first and second radio frequency signals into first intermediate frequency signals;
a second frequency translating stage for converting the first intermediate frequency signals into second intermediate frequency signals; and
a processing stage for retrieving the first information from the first intermediate frequency signals and the second information from the second intermediate frequency signals.
2. Receiver according to claim 1, the first frequency translating stage comprising a first oscillator and a first mixer coupled to the first oscillator.
3. Receiver according to claim 2, the first frequency translating stage further comprising a further first mixer coupled to the first oscillator.
4. Receiver according to claim 1, the second frequency translating stage comprising a second oscillator and a second mixer coupled to the second oscillator.
5. Receiver according to claim 4, the second frequency translating stage further comprising a further second mixer coupled to the second oscillator.
6. Receiver according to claim 5, the second frequency translating stage further comprising a third mixer and a further third mixer coupled to the second oscillator and further comprising a first adder and a second adder, inputs of the first adder being coupled to outputs of the second and third mixers and inputs of the second adder being coupled to outputs of the further second and further third mixer.
7. Receiver according to claim 1, the processing stage comprising a filter for filtering the first intermediate frequency signals for removing the second information.
8. Receiver according to claim 7, the processing stage further comprising a further filter for filtering the second intermediate frequency signals for removing the first information.
9. Receiver according to claim 8, the processing stage further comprising a third adder and a fourth adder, inputs of the third adder being coupled to outputs of the filter and the further filter and inputs of the fourth adder being coupled to further outputs of the filter and the further filter, and outputs of the third adder and the fourth adder being coupled to inputs of an analog-to-digital converter.
10. Receiver according to claim 1, the first standard being a Wireless Local Area Network standard and the second standard being a Bluetooth standard.
11. Frequency translating circuit for use in a receiver as defined in claim 1, the frequency translating circuit comprising:
the first frequency translating stage for converting the first and second radio frequency signals into the first intermediate frequency signals; and
the second frequency translating stage for converting the first intermediate frequency signals into the second intermediate frequency signals.
12. Method for simultaneously receiving first radio frequency signals according to a first standard and second radio frequency signals according to a second standard different from the first standard, the first frequency signals including first information and the second radio frequency signals including second information, the method comprising:
converting the first and second radio frequency signals into first intermediate frequency signals;
converting the first intermediate frequency signals into second intermediate frequency signals; and
retrieving the first information from the first intermediate frequency signals and the second information from the second intermediate signals.
13. A computer readable medium having a computer program embedded thereon when executed by a processor, for simultaneously receiving first radio frequency signals according to a first standard and second radio frequency signals according to a second standard different from the first standard, the first frequency signals including first information and the second radio frequency signals including second information, the program comprising the functions of:
converting the first and second radio frequency signals into first intermediate frequency signals;
converting the first intermediate frequency signals into second intermediate frequency signals; and
retrieving the first information from the first intermediate frequency signals and the second information from the second intermediate signals.
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. An aromatic polycarbonate that is obtained by transesterification between a high-purity diphenyl carbonate and an aromatic dihydroxy compound;
wherein the high-purity diphenyl carbonate is unsubstituted or substituted with a lower hydrocarbon, and has a halogen content of not more than 0.1 ppm, a content of an intermediate boiling point material of not more than 100 ppm, and a content of by-products having a higher boiling point than that of said diphenyl carbonate of not more than 100 ppm; and
wherein the high-purity diphenyl carbonate is prepared by a process that comprises taking as a starting material a reaction mixture containing an alkyl aryl carbonate that has been obtained through a transesterification reaction between a dialkyl carbonate and an aromatic monohydroxy compound, continuously feeding the starting material into a reactive distillation column comprising a continuous multi-stage distillation column in which a homogeneous catalyst is present, carrying out a transesterification reaction and distillation simultaneously in said column, continuously withdrawing a low boiling point reaction mixture containing a produced dialkyl carbonate from an upper portion of the column in a gaseous form, and continuously withdrawing a high boiling point reaction mixture containing a diaryl carbonate from a lower portion of the column in a liquid form, wherein:
(a) said high boiling point reaction mixture is continuously introduced into a high boiling point material separating column A, and continuously subjected to separation by distillation into a column top component AT containing the diaryl carbonate and a column bottom component AB containing the catalyst and a high boiling point material,
(b) said column top component AT is continuously introduced into a diaryl carbonate purifying column B having a side cut outlet, and continuously subjected to separation by distillation into a column top component BT, a side cut component BS and a column bottom component BB, the high-purity diaryl carbonate being continuously withdrawn as the side cut component BS, and
(c) said column top component BT is continuously introduced into an intermediate boiling point material separating column C having a side cut outlet, and continuously subjected to separation by distillation into a column top component CT having said alkyl aryl carbonate as a main component thereof, a side cut component CS having as a main component thereof said intermediate boiling point material having a boiling point between that of said alkyl aryl carbonate and that of said diaryl carbonate, and a column bottom component CB having said diaryl carbonate as a main component thereof.
2. The aromatic polycarbonate according to claim 1, wherein said diphenyl carbonate is unsubstituted diphenyl carbonate, and the halogen content is not more than 10 ppb, the content of said intermediate boiling point material is not more than 30 ppm, and the content of each of phenyl salicylate, xanthone, phenyl methoxybenzoate, and 1-phenoxycarbonyl-2-phenoxycarboxy-phenylene, which are by-products having a higher boiling point than that of said diphenyl carbonate, is not more than 30 ppm.
3. The aromatic polycarbonate according to claim 2, wherein the content of said intermediate boiling point material is not more than 10 ppm, and the content of the by-products having a higher boiling point than that of said diphenyl carbonate is not more than 50 ppm.
4. The aromatic polycarbonate according to claim 3, wherein the halogen content is not more than 1 ppb, and the content of the by-products having a higher boiling point than that of said diphenyl carbonate is not more than 10 ppm.