US5734678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels
Assignee: InterDigital Technology Corp
•
Filing: 1996-10-02
•
Granted: 1998-03-31
•
Expires: 2016-10-02
Abstract
Abstract A terrestrial Rf telephone system provides a plurality of voice signal channels on a plurality of forward direction carrier frequencies, each carrier frequency having an associated predetermined bandwidth which is designed to accommodate one analog voice signal, and each carrier frequency containing a plurality of slots. The system includes a base station having a plurality of circuit paths for receiving a plurality of forward direction digitized voice signals; a plurality of compressors for compressing the voice signals; a processor for assigning each of the compressed voice signals onto a dynamically assigned frequency/slot; a plurality of channel controllers, each for sequentially combining the compressed digitized voice signals into a single transmit channel bit stream, with each compressed voice signal occupying a respective repetitive sequential time slot in the transmit channel bit stream; and a plurality of modulators for modulating the carrier frequencies. A portion of the carrier frequency within a portion of each slot remains unmodulated by the transmit channel bit stream to provide a phase reference signal.
Inventors
- 👤 Eric Paneth
- 👤 Mark J. Handzel
- 👤 Steven Allan Morley
- 👤 Graham M. Avis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:49
CPC Classifications
H; H04; H04W; H04W84/00; H04W84/02; H04W84/10; H04W84/14; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0837; H04B7/0842; H04B7/0865; H04L; H04L1/00; H04L1/0001; H04L1/0002; H04L1/0003; H04L1/0006; H04L1/0007; H04L1/004; H04L1/0056; H04L1/0057; H04L1/0078; H04L1/0084; H04L1/02; H04L1/06; H04L1/12; H04L1/16; H04L1/1607; H04L1/1642; H04L1/18; H04L1/1867; H04L1/188; H04L1/1887; H04L5/00; H04L5/14; H04L5/143; H04W40/00; H04W40/02; H04W52/00; H04W52/04; H04W52/18; H04W52/20; H04W72/00; H04W72/04; H04W72/044; H04W72/0446; H04W88/00; H04W88/08; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0635; H04J3/0638; H04J3/0647; H04J3/0682; H04L1/0023; H04L1/0026; H04L1/0061; H04L1/08; H04W24/00; H04W28/00; H04W28/02; H04W28/06; H04W28/10; H04W28/14; H04W28/16; H04W28/24; H04W28/26; H04W36/00; H04W36/12; H04W4/00; H04W4/18; H04W52/02; H04W52/0209; H04W52/0212; H04W52/0216; H04W56/00; H04W72/02; H04W72/0453; H04W72/12; H04W72/20; H04W72/23; H04W74/00; H04W74/04; H04W76/00; H04W76/10; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
322 words
An apparatus for providing a plurality of voice signal channels on a plurality of forward direction carrier frequencies of a terrestrial RF telephone system, each of said forward direction carrier frequencies containing a plurality of slots, each of said forward direction carrier frequencies having an associated predetermined bandwidth which is designed to accommodate one analog voice signal channel therein, said apparatus comprising: a base station comprising: a plurality of circuit paths for receiving a plurality of forward direction digitized voice signals from a public switched telephone network; a plurality of compressors for respectively compressing each of said forward direction digitized voice signals by analyzing the speech content of said forward direction digitized voice signals and by using voice compression to form respective forward direction compressed digitized voice signals, each compressed digitized voice signal having a bit rate of less than 16 kb/s; a processor for assigning each of the compressed digitized voice signals a dynamically assigned frequency/slot; a plurality of channel controllers, each for sequentially combining said respective forward direction compressed digitized voice signals into a single transmit channel bit stream, with each of the respective forward direction compressed digitized voice signals occupying a respective repetitive sequential time slot in the transmit channel bit stream; a plurality of modulators for modulating each of said forward direction carrier frequencies with said transmit channel bit stream, each of said modulators using M-ary modulation to transmit at least 2 bits/symbol, wherein a carrier frequency within a portion of each said slot remains unmodulated by said transmit channel bit stream; and a transmitter for RF transmitting said forward direction modulated frequency carriers to at least one subscriber station, each of said transmitted modulated forward direction carrier frequencies residing within said predetermined bandwidth and capable of carrying in the forward direction at least two bidirectional simultaneous conversations; wherein at least part of said slot portion unmodulated with said transmit channel bit stream provides a phase reference signal.
Claim 2
Independent Claim
322 words
An apparatus for providing a plurality of voice signal channels on a plurality of forward direction carrier frequencies of a terrestrial RF telephone system, each of said forward direction carrier frequencies containing a plurality of slots, each of said forward direction carrier frequencies having an associated predetermined bandwidth which is designed to accommodate one analog voice signal channel therein, said apparatus comprising: a base station comprising: a plurality of circuit paths for receiving a plurality of forward direction digitized voice signals from a public switched telephone network; a plurality of compressors for respectively compressing each of said forward direction digitized voice signals by analyzing the speech content of said forward direction digitized voice signals and by using voice compression to form respective forward direction compressed digitized voice signals, each compressed digitized voice signal having a bit rate of less than 16 kb/s; a processor for assigning each of the compressed digitized voice signals a dynamically assigned frequency/slot; a plurality of channel controllers, each for sequentially combining said respective forward direction compressed digitized voice signals into a single transmit channel bit stream, with each of the respective forward direction compressed digitized voice signals occupying a respective repetitive sequential time slot in the transmit channel bit stream; a plurality of modulators for modulating each of said forward direction carrier frequencies with said transmit channel bit stream, each of said modulators using M-ary modulation to transmit at least 2 bits/symbol, wherein a carrier frequency within a portion of each said slot remains unmodulated by said transmit channel bit stream; and a transmitter for RF transmitting said forward direction modulated frequency carriers to at least one subscriber station, each of said transmitted modulated forward direction carrier frequencies residing within said predetermined bandwidth and capable of carrying in the forward direction at least two bidirectional simultaneous conversations; wherein at least part of said slot portion unmodulated with said transmit channel bit stream provides a phase reference signal.
Claim 3
Dependent Claim
42 words
An apparatus as in claim 1 wherein each said compressor produces a set of coefficients and an additional signal which are contained in each forward direction compressed voice signal, and which are used to reconstruct a respective forward direction digitized voice signal.
Claim 4
Dependent Claim
45 words
An apparatus as in claim 1 further comprising means responsive to call requests from said public switched telephone network associated with each of said plurality of digitized voice signals for establishing call paths for each of said plurality of digitized voice signals through said apparatus.
Claim 5
Dependent Claim
157 words
An apparatus as in claim 3 wherein said circuit paths comprise, an exchange for switching the digitized voice signals through respective compressors and to an assigned time slot; and said processor comprises means responsive to said call requests for providing a slot/frequency assignment signal indicating which slot and frequency a compressed digitized voice signal is to occupy, thereby assigning a compressed digitized voice signal to a time slot and frequency in said transmit channel bit stream, said means for providing a slot/frequency assignment signal including a memory which stores information concerning which slots/frequencies have been so assigned, said means for providing a slot/frequency assignment signal accessing said memory upon receipt of an incoming call request; wherein said means responsive to said slot/frequency assignment signal causes said exchange to complete the necessary connections so that an incoming digitized voice signal is routed through a respective compressor to said dynamically assigned time slot in said transmit channel bit stream.
Claim 6
Dependent Claim
251 words
An apparatus as in claim 1 wherein said apparatus also receives a plurality of voice signal channels on reverse direction carrier frequencies of said terrestrial RF telephone system, each of said reverse direction carrier frequencies having an associated predetermined reverse frequency channel bandwidth which is designed to accommodate one analog voice signal channel and together with said forward direction carrier frequency provides at least two simultaneous bidirectional conversations between said base station and two or more subscriber stations, said base station further comprising: a receiver for receiving a respective receive channel signal, said receive channel signal having a different carrier frequency than said forward direction carrier frequency and residing within said predetermined reverse frequency channel bandwidth, said receive channel signal having a receive channel bit stream M-ary modulated thereon; a plurality of demodulators each for demodulating one of said receive channel signals to provide said receive channel bit stream containing separate reverse direction compressed signals in different respective repetitive sequential slot positions, each of said reverse direction compressed signals being produced at a subscriber station by voice compression coding techniques applied to a respective subscriber generated digitized voice signal; a signal separator for separating said reverse direction separate compressed signals from said receive channel bit stream; a plurality of decompressors for respectively decompressing the reverse direction separate compressed signals using voice compression decoding techniques to produce separate reverse direction decompressed digitized voice signals; and circuit paths for applying said separate reverse direction digitized voice signals to said public switched telephone network.
Claim 7
Dependent Claim
45 words
An apparatus as in claim 5 wherein each said compressor produces a set of coefficients and an additional signal which are contained in each forward direction compressed voice signal and which represent and can be used to reconstruct a respective forward direction digitized voice signal.
Claim 8
Dependent Claim
25 words
An apparatus as in claim 5 wherein a portion of said reverse carrier frequency in each slot remain unmodulated with said received channel bit stream.
Claim 9
Dependent Claim
34 words
An apparatus as in claim 7 wherein at least a part of the slot portion unmodulated with said reverse channel bit stream is modulated with a predetermined bit pattern for use in symbol timing.
Claim 10
Dependent Claim
17 words
An apparatus as in claim 1 wherein said forward direction carrier frequencies are modulated with 16-ary modulation.
Claim 11
Dependent Claim
17 words
An apparatus as in claim 1 wherein said forward direction carrier frequencies are modulated with 32-ary modulation.
Claim 12
Dependent Claim
18 words
An apparatus as in claim 1 wherein said forward direction carrier frequencies are PSK modulated with 64-ary modulation.
Claim 13
Dependent Claim
61 words
An apparatus as in claim 1 wherein said plurality of modulators include means for M-ary modulating at least one of said respective forward direction carrier frequencies with a first M-ary modulation level and for M-ary modulating at least one of said respective forward direction carrier frequencies with a second M-ary modulation level, said first and second M-ary modulation levels being different.
Claim 14
Dependent Claim
34 words
An apparatus as in claim 1 wherein each slot contains a respective forward direction compressed digitized voice signal, at least one of said slots having a different time duration from others of said slots.
Claim 15
Dependent Claim
25 words
An apparatus as in claim 1 further comprising means for establishing the number of time slots which occur on each of said forward frequency channels.
Claim 16
Dependent Claim
33 words
An apparatus as in claim 1 wherein at least part of said slot portion unmodulated with said transmit channel bit stream is modulated by a predetermined bit pattern for use in symbol timing.
Claim 17
Independent Claim
273 words
An apparatus for providing at least one data information signal on one of a plurality of forward direction carrier frequencies of a terrestrial RF telephone system, each of said forward direction carrier frequencies containing a plurality of slots, each of said forward direction carrier frequencies having an associated predetermined bandwidth which is designed to accommodate one analog voice signal channel therein, said apparatus comprising: a base station comprising: a plurality of circuit paths, on one of said circuit paths said at least one data information signal from a public switched telephone network is carried, the information rate of said data information signal being less than 16 kb/s; a processor for assigning said data information signal a dynamically assigned frequency/slot; a plurality of channel controllers, one of said controllers including said data information signal into a single transmit channel bit stream, with the data information signal occupying a respective repetitive sequential time slot in the transmit channel bit stream; a plurality of modulators, one of which modulates the assigned forward direction carrier frequency with said transmit channel bit stream, said modulator using M-ary modulation to transmit at least 2 bits/symbol, wherein the carrier frequency within a portion of said slot remains unmodulated by said data information signal; and a transmitter for RF transmitting said forward direction modulated frequency carrier to at least one subscriber station, each of said transmitted modulated forward direction carrier frequencies residing within said predetermined bandwidth and capable of carrying in the forward direction at least two bidirectional simultaneous data information signals; wherein at least part of said slot portion unmodulated with said data information signal provides a phase reference signal.
Claim 18
Independent Claim
273 words
An apparatus for providing at least one data information signal on one of a plurality of forward direction carrier frequencies of a terrestrial RF telephone system, each of said forward direction carrier frequencies containing a plurality of slots, each of said forward direction carrier frequencies having an associated predetermined bandwidth which is designed to accommodate one analog voice signal channel therein, said apparatus comprising: a base station comprising: a plurality of circuit paths, on one of said circuit paths said at least one data information signal from a public switched telephone network is carried, the information rate of said data information signal being less than 16 kb/s; a processor for assigning said data information signal a dynamically assigned frequency/slot; a plurality of channel controllers, one of said controllers including said data information signal into a single transmit channel bit stream, with the data information signal occupying a respective repetitive sequential time slot in the transmit channel bit stream; a plurality of modulators, one of which modulates the assigned forward direction carrier frequency with said transmit channel bit stream, said modulator using M-ary modulation to transmit at least 2 bits/symbol, wherein the carrier frequency within a portion of said slot remains unmodulated by said data information signal; and a transmitter for RF transmitting said forward direction modulated frequency carrier to at least one subscriber station, each of said transmitted modulated forward direction carrier frequencies residing within said predetermined bandwidth and capable of carrying in the forward direction at least two bidirectional simultaneous data information signals; wherein at least part of said slot portion unmodulated with said data information signal provides a phase reference signal.
Claim 19
Dependent Claim
33 words
An apparatus as in claim 16 wherein said at least part of said slot portion unmodulated with said data information signal is modulated by a predetermined bit pattern for use in symbol timing.
Claim 20
Independent Claim
328 words
An apparatus for providing a plurality of voice signal channels on a plurality of forward direction carrier frequencies of a terrestrial RF telephone system, each of said forward direction carrier frequencies containing a plurality of slots, each of said forward direction carrier frequencies having an associated predetermined bandwidth which is designed to accommodate one analog voice signal channel therein, said apparatus comprising: a base station comprising: a plurality of circuit paths for receiving a plurality of forward direction digitized voice signals from a public switched telephone network; a plurality of compressors for respectively compressing each of said forward direction digitized voice signals by analyzing the speech content of said forward direction digitized voice signals and by using voice compression to form respective forward direction compressed digitized voice signals, each compressed digitized voice signal having a bit rate of less than 16 kb/s; a processor for assigning each of the compressed digitized voice signals a dynamically assigned frequency/slot; a plurality of channel controllers, each for sequentially combining said respective forward direction compressed digitized voice signals into a single transmit channel bit stream, with each of the respective forward direction compressed voice signals occupying a respective repetitive sequential time slot in the transmit channel bit stream; a plurality of modulators for modulating each of said forward direction carrier frequencies with said transmit channel bit stream, each of said modulators using M-ary modulation to transmit at least 2 bits/symbol, wherein a carrier frequency within a portion of each said slot remains unmodulated by said transmit channel bit stream; and a transmitter for RF transmitting said forward direction modulated frequency carriers to at least one subscriber station, each of said transmitted modulated forward direction carrier frequencies residing within said predetermined bandwidth and capable of carrying in the forward direction at least two bidirectional simultaneous conversations; wherein at least part of said slot portion unmodulated with said transmit channel bit stream is modulated by a predetermined bit pattern for use in symbol timing.
Claim 21
Independent Claim
328 words
An apparatus for providing a plurality of voice signal channels on a plurality of forward direction carrier frequencies of a terrestrial RF telephone system, each of said forward direction carrier frequencies containing a plurality of slots, each of said forward direction carrier frequencies having an associated predetermined bandwidth which is designed to accommodate one analog voice signal channel therein, said apparatus comprising: a base station comprising: a plurality of circuit paths for receiving a plurality of forward direction digitized voice signals from a public switched telephone network; a plurality of compressors for respectively compressing each of said forward direction digitized voice signals by analyzing the speech content of said forward direction digitized voice signals and by using voice compression to form respective forward direction compressed digitized voice signals, each compressed digitized voice signal having a bit rate of less than 16 kb/s; a processor for assigning each of the compressed digitized voice signals a dynamically assigned frequency/slot; a plurality of channel controllers, each for sequentially combining said respective forward direction compressed digitized voice signals into a single transmit channel bit stream, with each of the respective forward direction compressed voice signals occupying a respective repetitive sequential time slot in the transmit channel bit stream; a plurality of modulators for modulating each of said forward direction carrier frequencies with said transmit channel bit stream, each of said modulators using M-ary modulation to transmit at least 2 bits/symbol, wherein a carrier frequency within a portion of each said slot remains unmodulated by said transmit channel bit stream; and a transmitter for RF transmitting said forward direction modulated frequency carriers to at least one subscriber station, each of said transmitted modulated forward direction carrier frequencies residing within said predetermined bandwidth and capable of carrying in the forward direction at least two bidirectional simultaneous conversations; wherein at least part of said slot portion unmodulated with said transmit channel bit stream is modulated by a predetermined bit pattern for use in symbol timing.
Claim 22
Independent Claim
280 words
An apparatus for providing at least one data information signal on one of a plurality of forward direction carrier frequencies of a terrestrial RF telephone system, each of said forward direction carrier frequencies containing a plurality of slots, each of said forward direction carrier frequencies having an associated predetermined bandwidth which is designed to accommodate one analog voice signal channel therein, said apparatus comprising: a base station comprising: a plurality of circuit paths, on one of said circuit paths said at least one data information signal from a public switched telephone network is carried; the information rate of said data information signal being less than 16 kb/s; a processor for assigning said data information signal a dynamically assigned frequency/slot; a plurality of channel controllers, one of said controllers including said data information signal into a single transmit channel bit stream, with the data information signal occupying a respective repetitive sequential time slot in the transmit channel bit stream; a plurality of modulators, one of which modulates the assigned forward direction carrier frequency with said transmit channel bit stream, said modulator using M-ary modulation to transmit at least 2 bits/symbol, wherein the carrier frequency within a portion of said slot remains unmodulated by said data information signal; and a transmitter for RF transmitting said forward direction modulated frequency carrier to at least one subscriber station, each of said transmitted modulated forward direction carrier frequencies residing within said predetermined bandwidth and capable of carrying in the forward direction at least two bidirectional simultaneous data information signals; wherein at least part of said slot portion unmodulated with said data information signal is modulated by a predetermined bit pattern for use in symbol timing.
Claim 23
Independent Claim
280 words
An apparatus for providing at least one data information signal on one of a plurality of forward direction carrier frequencies of a terrestrial RF telephone system, each of said forward direction carrier frequencies containing a plurality of slots, each of said forward direction carrier frequencies having an associated predetermined bandwidth which is designed to accommodate one analog voice signal channel therein, said apparatus comprising: a base station comprising: a plurality of circuit paths, on one of said circuit paths said at least one data information signal from a public switched telephone network is carried; the information rate of said data information signal being less than 16 kb/s; a processor for assigning said data information signal a dynamically assigned frequency/slot; a plurality of channel controllers, one of said controllers including said data information signal into a single transmit channel bit stream, with the data information signal occupying a respective repetitive sequential time slot in the transmit channel bit stream; a plurality of modulators, one of which modulates the assigned forward direction carrier frequency with said transmit channel bit stream, said modulator using M-ary modulation to transmit at least 2 bits/symbol, wherein the carrier frequency within a portion of said slot remains unmodulated by said data information signal; and a transmitter for RF transmitting said forward direction modulated frequency carrier to at least one subscriber station, each of said transmitted modulated forward direction carrier frequencies residing within said predetermined bandwidth and capable of carrying in the forward direction at least two bidirectional simultaneous data information signals; wherein at least part of said slot portion unmodulated with said data information signal is modulated by a predetermined bit pattern for use in symbol timing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-30 | 2001-09-29 | 2002-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-30 | 2005-09-29 | 2006-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-30 | 2009-09-29 | 2010-03-31 | $7700.00 | Window Closed / Lapsed |