WO1996010878B1 - Very low power cordless headset system - Google Patents
Very low power cordless headset systemInfo
- Publication number
- WO1996010878B1 WO1996010878B1 PCT/US1995/012536 US9512536W WO9610878B1 WO 1996010878 B1 WO1996010878 B1 WO 1996010878B1 US 9512536 W US9512536 W US 9512536W WO 9610878 B1 WO9610878 B1 WO 9610878B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- time variant
- audio signal
- location
- receiver
- headset
- Prior art date
Links
- 230000000051 modifying Effects 0.000 claims abstract 22
- 230000005540 biological transmission Effects 0.000 claims abstract 16
- 230000001702 transmitter Effects 0.000 claims abstract 6
- 230000005236 sound signal Effects 0.000 claims 20
- 230000001360 synchronised Effects 0.000 claims 2
- 238000011084 recovery Methods 0.000 claims 1
Abstract
A cordless headset (400), requiring very low power using Time Variant Modulation (TVM) for reception of a magnetic signal and TVM of RF or infraded as the transmitter. The headset (400) area or zone of operations is defined by the magnetic field that the headset (400) operates within and uses a handshake protocol that takes advantage of the TVM fixed clock period. The headset (400) communicates with a base station (300) that includes a TVM transmitter (304) and loop for transmitting a TVM signal to the cordless headset (400), and an RF or infrared receiver (310) capable of receiving TVM signals from the headset (400). The base station (300) also contains the headset protocol logic for controlling the headset (400) transmission. The headset (400) and base station (300) receiver can both be fixed, mobile or portable and vary with respect to orientation and distance from each other. The receiver circuits (310, 404) in both base station (300) and headset (400) automatically adjust to the variance in signal strength.
Claims
1. A two-way wireless communication system for transmitting audio signals between a first location and a second location, the system comprising: first transmission means, disposed at said first location, for receiving a first audio signal, said first transmission means including a time variant modulation clock generator for generating a time variant modulation clock signal, modulation means, responsive to the time variant modulation clock signal for time variant modulating said first audio signal to produce a time variant modulated first audio signal, and a magnetic transmission element for transmitting said time variant modulated first audio signal; first receiver means, disposed at said second location and including a magnetic receiving element magnetically coupled to said magnetic transmission element, for receiving and demodulating said time variant modulated first audio signal; second transmission means, disposed at said second location, for receiving and transmitting a second audio signal, said transmission means including at least one of a RF transmitter and an infrared transmitter for transmitting said second audio signal; and second receiver means, disposed at said first location and including at least one of a RF receiver and an infrared receiver, for receiving said second audio signal, wherein at least one of said first and second locations comprises a portable communication device.
2. The two-way wireless communication system according to claim 1, wherein the first location comprises a base station and the second location comprises a cordless headset.
3. The two-way wireless communication system according to claim 4, wherein the first location comprises a base station and the second location comprises a cordless handset. 68
4. A two-way wireless communication system for transmitting audio signals between a first location and a second location, the system comprising: first transmission means, disposed at said first location, for receiving a first audio signal, said first transmission means including a time variant modulation clock generator for generating a first time variant modulation clock signal, modulation means, responsive to the first time variant modulation clock signal for time variant modulating said first audio signal to produce a time variant modulated first audio signal, and a magnetic transmission element for transmitting said time variant modulated first audio signal; first receiver means, disposed at said second location and including a magnetic receiving element magnetically coupled to said magnetic transmission element, for receiving and demodulating said time variant modulated first audio signal; second transmission means, disposed at said second location, for receiving a second audio signal and for time variant modulating said second audio signal, said transmission means including at least one of a RF transmitter and an infrared transmitter for transmitting said time variant modulated second audio signal; and second receiver means, disposed at said first location and including at least one of a RF receiver and an infrared receiver, for receiving and demodulating said time variant modulated second audio signal, wherein the first location comprises a base station and the second location comprises a portable cordless headset.
5. The two-way wireless communication system according to claim 4, wherein the first receiver means includes: time variant modulation clock recovery means, responsive to said received modulated first audio signal, for producing a second time variant clock signal, said second time variant clock signal being synchronous with said first time variant clock signal. 69
6. The two-way wireless communication system according to claim 5, wherein the first transmission means further includes a pilot tone generator for generating and transmitting a pilot tone to said first receiver means.
7. The two-way wireless communication system according to claim 6, wherein the first receiver means further includes a pilot tone detector for detecting said pilot tone transmitted by said transmission means.
8. The two-way wireless communication system according to claim 7, wherein said pilot tone detector includes means for comparing said detected pilot tone with said second time variant clock signal to determine if said detected pilot tone and said second time variant clock signal are synchronous.
9. The two-way wireless communication system according to claim 8, wherein said pilot tone detector includes means, responsive to at least one of said detected pilot tone, for disabling said second transmission means.
70
STATEMENT UNDER ARTICLE 19
The claims have been amended in order to conform the claims to the amendments made in the priority application in the United States. The amendments do not go beyond the disclosure of the international application as originally filed.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU37327/95A AU3732795A (en) | 1994-10-03 | 1995-10-02 | Very low power cordless headset system |
DE69534704T DE69534704T2 (en) | 1994-10-03 | 1995-10-02 | CORDLESS HEADPHONE OF VERY LOW POWER |
EP95935232A EP0809906B1 (en) | 1994-10-03 | 1995-10-02 | Very low power cordless headset system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/316,920 | 1994-10-03 | ||
US08/316,920 US5568516A (en) | 1993-07-02 | 1994-10-03 | Very low power cordless headset system |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1996010878A1 WO1996010878A1 (en) | 1996-04-11 |
WO1996010878B1 true WO1996010878B1 (en) | 1996-06-06 |
Family
ID=23231290
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1995/012536 WO1996010878A1 (en) | 1994-10-03 | 1995-10-02 | Very low power cordless headset system |
Country Status (5)
Country | Link |
---|---|
US (2) | US5568516A (en) |
EP (1) | EP0809906B1 (en) |
AU (1) | AU3732795A (en) |
DE (1) | DE69534704T2 (en) |
WO (1) | WO1996010878A1 (en) |
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- 1995-10-02 DE DE69534704T patent/DE69534704T2/en not_active Expired - Lifetime
- 1995-10-02 EP EP95935232A patent/EP0809906B1/en not_active Expired - Lifetime
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