CA2022958A1 - Portable handsets - Google Patents
Portable handsetsInfo
- Publication number
- CA2022958A1 CA2022958A1 CA 2022958 CA2022958A CA2022958A1 CA 2022958 A1 CA2022958 A1 CA 2022958A1 CA 2022958 CA2022958 CA 2022958 CA 2022958 A CA2022958 A CA 2022958A CA 2022958 A1 CA2022958 A1 CA 2022958A1
- Authority
- CA
- Canada
- Prior art keywords
- screening plate
- handset
- hearing aid
- portable
- antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/245—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephone Set Structure (AREA)
Abstract
Abstract Title: Portable Handsets A portable handset includes a burst mode radio transmitter/receiver unit having an antenna (14). The handset carries a screening plate (16) to screen a user's hearing aid (20) from the radio frequency power produced by the antenna (14) of the unit.
Description
- 2~229~ ~
,, .
Portable Handsets Field of the invention This invention relates to portable handsets for use in cordless telephone systems. ` -~
Background to the invention One particular class of cordless telephones, shortly to be launched in the UK and going under the code name of "CT2"
uses a system called "burst mode duplex". The same radio ~-channel is used for both transmission and reception, with the two radios at the ends of the communication link alternately transmitting a burst of information. CT2 products have two `sources of interference which affect ' , hearing aids. The first is magnetic interference which is tackled in our co-pending patent application number 8914888.6. The secona is electro-magnetic interference and lt is this second type of interference which the present invention attempts to suppress.
The handset transmits radio frequency power, in this case at 860~MHz or thereabouts. When the hand~set is placed c;lose to the ear, some of the transmitted radio frequency power enters the hearing aid. The radio frequency energy is rectified by various non-linear circuit elements in the hearing aid and because the power is being keyed on and off by the burst mode duplexing, the interference becomes audible in the hearing aid at the duplex rate, 500 Hz. -;~
- ~
202~3~
The present invention aims to suppress interference from this source, so that when used in conjunction with the magnetic interference suppression of a co-pending patent application number 8914888.6 hearing aid users can enjoy the use of cordless telephones without interference being a problem.
Summary of the invention According to the invention a portable handset includes a burst mode radio transmitter/receiver unit, the unit comprising an antenna and the handset including a screening plate located to screen a user's hearing aid from the radio frequency power produced by the unit, when the latter is placed near the hearing aid.
-:
The screening plate is preferably perforated so that the handset can be used by a person with normal hearing.
The screening plate is preferably detachably mounted on a -~
body of the handset, for example by a retaining clip.
The screening plate may be curved to present a concave surface to the hearing aid, when the handset is placed in ~ -an operative position adjacent the hearing aid. The screening plate may be of a compliant material.
The~invention will~ now be further described by way of example with reference to the accompanying drawing which shows a portable handset according to the invention in use adjacent the ear of a user who has a hearing aid. ;~ -~
Description of Preferred Embodiment :' ,. ' 2Q~2~ ~
Referring to the drawing, the handset 10 has an outer case 12 which encloses a burst mode radio transmitter/receiver unit, the antenna for which is shown at 14 (the casing being shown cut away to reveal the antenna 14). A
screening plate 16 is detachably mounted on the handset casing by means of a retaining clip 18. When in the operative position shown, the screening plate 16 is disposed between the antenna 14 and the users hearing aid illustrated at 20.
The screening plate 16 is made of a synthetic plastics material coated with an electrically conductive material which is reflective to the radio frequency power emanating from the antenna 14. The screening plate 16 is perforated so that the handset can be used by a person with normal hearing and it is positioned so as to block the direct path between the antenna 14 and the hearing aid 20. The screening plate 16 extends for the full width of the body ~: :
of the handset 10 and extends as far as the top of the :~
antenna 14.
Improved performance can be gained by making the screening plate of a curved shape so that it cups the hearing aid and ear, thus providing better screening. Generally ~ :
speaking, the bigger the screening plate and the smaller -~
the gap between the screening plate and the user's head behind the hearing aid, the more effective the :h interferenceisuppressiion.
If a larger or cupped screening plate is used it may be an advantage to make it from a:soft compliant material so the handset can~be easily pocketed. A further advantage of using a compliant material is that a deep cup can be used to enclose the hearing aid but the material earpiece can ~ :
: .:
~ ' ~,.~
~ ~ i2 ~
i still be pressed against the ear when used without a hearing aid.
The screening plate can be designed to give improved acoustic perforl,lance for users with normal hearing or for users with hearing aids which lack inductive pick-up. For ;.
instance, by having a deeper ear cup, a better acoustic seal may be obtained which would enhance performance when :
the handset is used in a noisy environment. -~: i' , - ~
: -: ,, ~ .
`: :`:
,, .
Portable Handsets Field of the invention This invention relates to portable handsets for use in cordless telephone systems. ` -~
Background to the invention One particular class of cordless telephones, shortly to be launched in the UK and going under the code name of "CT2"
uses a system called "burst mode duplex". The same radio ~-channel is used for both transmission and reception, with the two radios at the ends of the communication link alternately transmitting a burst of information. CT2 products have two `sources of interference which affect ' , hearing aids. The first is magnetic interference which is tackled in our co-pending patent application number 8914888.6. The secona is electro-magnetic interference and lt is this second type of interference which the present invention attempts to suppress.
The handset transmits radio frequency power, in this case at 860~MHz or thereabouts. When the hand~set is placed c;lose to the ear, some of the transmitted radio frequency power enters the hearing aid. The radio frequency energy is rectified by various non-linear circuit elements in the hearing aid and because the power is being keyed on and off by the burst mode duplexing, the interference becomes audible in the hearing aid at the duplex rate, 500 Hz. -;~
- ~
202~3~
The present invention aims to suppress interference from this source, so that when used in conjunction with the magnetic interference suppression of a co-pending patent application number 8914888.6 hearing aid users can enjoy the use of cordless telephones without interference being a problem.
Summary of the invention According to the invention a portable handset includes a burst mode radio transmitter/receiver unit, the unit comprising an antenna and the handset including a screening plate located to screen a user's hearing aid from the radio frequency power produced by the unit, when the latter is placed near the hearing aid.
-:
The screening plate is preferably perforated so that the handset can be used by a person with normal hearing.
The screening plate is preferably detachably mounted on a -~
body of the handset, for example by a retaining clip.
The screening plate may be curved to present a concave surface to the hearing aid, when the handset is placed in ~ -an operative position adjacent the hearing aid. The screening plate may be of a compliant material.
The~invention will~ now be further described by way of example with reference to the accompanying drawing which shows a portable handset according to the invention in use adjacent the ear of a user who has a hearing aid. ;~ -~
Description of Preferred Embodiment :' ,. ' 2Q~2~ ~
Referring to the drawing, the handset 10 has an outer case 12 which encloses a burst mode radio transmitter/receiver unit, the antenna for which is shown at 14 (the casing being shown cut away to reveal the antenna 14). A
screening plate 16 is detachably mounted on the handset casing by means of a retaining clip 18. When in the operative position shown, the screening plate 16 is disposed between the antenna 14 and the users hearing aid illustrated at 20.
The screening plate 16 is made of a synthetic plastics material coated with an electrically conductive material which is reflective to the radio frequency power emanating from the antenna 14. The screening plate 16 is perforated so that the handset can be used by a person with normal hearing and it is positioned so as to block the direct path between the antenna 14 and the hearing aid 20. The screening plate 16 extends for the full width of the body ~: :
of the handset 10 and extends as far as the top of the :~
antenna 14.
Improved performance can be gained by making the screening plate of a curved shape so that it cups the hearing aid and ear, thus providing better screening. Generally ~ :
speaking, the bigger the screening plate and the smaller -~
the gap between the screening plate and the user's head behind the hearing aid, the more effective the :h interferenceisuppressiion.
If a larger or cupped screening plate is used it may be an advantage to make it from a:soft compliant material so the handset can~be easily pocketed. A further advantage of using a compliant material is that a deep cup can be used to enclose the hearing aid but the material earpiece can ~ :
: .:
~ ' ~,.~
~ ~ i2 ~
i still be pressed against the ear when used without a hearing aid.
The screening plate can be designed to give improved acoustic perforl,lance for users with normal hearing or for users with hearing aids which lack inductive pick-up. For ;.
instance, by having a deeper ear cup, a better acoustic seal may be obtained which would enhance performance when :
the handset is used in a noisy environment. -~: i' , - ~
: -: ,, ~ .
`: :`:
Claims (6)
1. A portable handset including a burst mode radio transmitter/receiver unit the unit comprising an antenna and the handset including a screening plate located to screen a user's hearing aid from the radio frequency power produced by the unit, when the latter is placed near the hearing aid.
2. A portable handset according to claim 1, wherein the screening plate is perforated so that the handset can be used by a person with normal hearing.
3. A portable handset according to claim 1, wherein the screening plate is detachably mounted on a body of the handset.
4. A portable handset according to claim 1, wherein the screening plate is detachably mounted on the body by a retaining clip.
5. A portable handset according to claim 1, wherein the screening plate is curved to present a concave surface to the hearing aid, when the handset is placed in an operative position adjacent the hearing aid.
6. A portable handset according to claim 1, wherein the screening plate is made of a compliant material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2022958 CA2022958A1 (en) | 1990-08-09 | 1990-08-09 | Portable handsets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2022958 CA2022958A1 (en) | 1990-08-09 | 1990-08-09 | Portable handsets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2022958A1 true CA2022958A1 (en) | 1992-02-10 |
Family
ID=4145685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2022958 Abandoned CA2022958A1 (en) | 1990-08-09 | 1990-08-09 | Portable handsets |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2022958A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994021054A1 (en) * | 1993-03-11 | 1994-09-15 | Leslie Ronald Wilson | Accessory for a mobile communication device |
| EP0652645A1 (en) * | 1993-10-09 | 1995-05-10 | Philips Patentverwaltung GmbH | Portable radio device with means for protecting its user from electromagnetic radiation |
| EP0663734A1 (en) * | 1994-01-13 | 1995-07-19 | Siemens Aktiengesellschaft | Handheld transceiver |
| EP0669060A1 (en) * | 1993-02-01 | 1995-08-30 | DANIELS, John J. | Radiation shielding apparatus for a radio transmitting device |
| US5787340A (en) * | 1993-02-15 | 1998-07-28 | Nokia Mobile Phones | Radiation shielding apparatus for communication device |
| EP0954050A1 (en) * | 1993-05-27 | 1999-11-03 | Griffith University | Antennas for use in portable communications devices |
| US6259896B1 (en) | 1994-02-15 | 2001-07-10 | Nokia Mobile Phones Limited | Device for radio communication |
-
1990
- 1990-08-09 CA CA 2022958 patent/CA2022958A1/en not_active Abandoned
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0669060A1 (en) * | 1993-02-01 | 1995-08-30 | DANIELS, John J. | Radiation shielding apparatus for a radio transmitting device |
| EP0669060A4 (en) * | 1993-02-01 | 1996-06-05 | John J Daniels | Radiation shielding apparatus for a radio transmitting device. |
| US5787340A (en) * | 1993-02-15 | 1998-07-28 | Nokia Mobile Phones | Radiation shielding apparatus for communication device |
| US6088579A (en) * | 1993-02-15 | 2000-07-11 | Nokia Mobile Phones Limited | Device for radio communication |
| WO1994021054A1 (en) * | 1993-03-11 | 1994-09-15 | Leslie Ronald Wilson | Accessory for a mobile communication device |
| EP0954050A1 (en) * | 1993-05-27 | 1999-11-03 | Griffith University | Antennas for use in portable communications devices |
| EP0652645A1 (en) * | 1993-10-09 | 1995-05-10 | Philips Patentverwaltung GmbH | Portable radio device with means for protecting its user from electromagnetic radiation |
| EP0663734A1 (en) * | 1994-01-13 | 1995-07-19 | Siemens Aktiengesellschaft | Handheld transceiver |
| US6259896B1 (en) | 1994-02-15 | 2001-07-10 | Nokia Mobile Phones Limited | Device for radio communication |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |