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1. CA2294542 - PROCEDE ET DISPOSITIF DE RADIOTRANSMISSION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]
CLAIMS:
1. An apparatus for radio transmission of digital user data, comprising: a memory for temporarily storing said user data to be transmitted by said radio transmission apparatus, said user data being arranged in data words of a defined length; a controller for controlling reads from, and writes to, said memory and for converting said user data into time-division multiplex frames, said time-division multiplex frames comprising active time slots in which said user data are transmitted and inactive time slots in which no user data are transmitted, said controller respectively and continuously writing n (where n=a whole number >= 1) data words of said user data into said memory during a storage time period enveloping a time period from a beginning of an active time slot to a beginning of a subsequent active time slot, and respectively reading from said memory the n data words immediately at the end of the storage time period.
2. An apparatus according to claim 1, wherein: said data word length is one byte, corresponding to eight bits of said user data.
3. An apparatus according to claim 2, wherein: said controller stores five bytes of said user data during said storage time period.
4. An apparatus according to claim 1, wherein: said controller writes said user data into said memory at a data rate of 32 kbit/s.
5. An apparatus according to claim 1, wherein:
said controller reads said user data out from said memory at a data rate of 576 kbit/s.
6. An apparatus according to claim 1, wherein: said controller converts said user data into time-division multiplex frames having an overall length of 10 ms.
7. An apparatus according to claim 6, wherein: each said time-division multiplex frame comprises four active time slots for data transmission from a fixed station to a mobile apparatus of a cordless telephone, four active time slots for data transmission from said mobile apparatus to said fixed apparatus of the cordless telephone system, and eight inactive time slots, each arranged respectively between any two said active time slots.
8. An apparatus according to claim 7, wherein: the time duration of said active time slots is twice as long as that of said inactive time slots.
9. An apparatus according to claim 8, wherein: said active time slots each have a duration of 833 µs, and 320 bits of said user data can be transmitted per time slot.
10. An apparatus according to claim 1, wherein: said radio transmission takes place at a carrier frequency of 2.4 GHz.
11. An apparatus according to claim 1 wherein said user data is speech data.
12. A method for radio transmission, comprising the steps of:
arranging digital user data into data words of a defined length in time-division multiplex frames; transmitting said user data within active time slots in which data are transmitted of said time-division multiplex frames; withholding transmitting said user data within inactive time slots in which no user data are transmitted of said timedivision multiplex frames; storing said user data temporarily into a memory at a first data rate during a time period from a beginning of an active time slot to a beginning of a subsequent active time slot, wherein during said time period n (where n is a whole number greater than or equal to one) data words of said user data are respectively and continuously stored; reading out said n data words from said memory immediately; and converting said n data words into said time-division multiplex frames at a second data rate which is greater than said first data rate.
13. A method according to claim 12, wherein: said data word length is one byte, corresponding to eight bits of said user data.
14. A method according to claim 13, wherein: five bytes of said user data are respectively stored during said time period.
15. A method according to claim 12, wherein: said first data rate is 32 kbit/s.
16. A method according to claim 12, wherein: said second data rate is 576 kbit/s.
17. A method according to claim 12, wherein: said time-division multiplex frame has a length of 10 ms.
18. A method according to claim 17, wherein: said time-division multiplex frame comprises four active time slots for data transmission in a defined direction, four active time slots for data transmission in an opposite direction of said defined direction, and eight inactive time slots, each arranged respectively between any two said active time slots.
19. A method according to claim 18, wherein: a time duration of said active time slots is twice as long as that of said inactive time slots.
20. A method according to claim 19, wherein: said active time slots each have a duration of 833 µs.
21. A method according to claim 12 wherein: said step of transmitting said user data further comprises the step of transmitting 320 bits of user data per time slot.
22. A method according to claim 12, further comprising the step of: using a carrier frequency of 2.4 GHz for said radio transmission.
23. A method according to claim 12, wherein said user data is speech data.