EP1000501A1 - Freisprecheinrichtung - Google Patents
FreisprecheinrichtungInfo
- Publication number
- EP1000501A1 EP1000501A1 EP98931905A EP98931905A EP1000501A1 EP 1000501 A1 EP1000501 A1 EP 1000501A1 EP 98931905 A EP98931905 A EP 98931905A EP 98931905 A EP98931905 A EP 98931905A EP 1000501 A1 EP1000501 A1 EP 1000501A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stroke
- signal branch
- hands
- value
- free system
- 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.)
- Ceased
Links
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000008878 coupling Effects 0.000 claims abstract description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims description 13
- 238000013016 damping Methods 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000004891 communication Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 3
- 238000005457 optimization Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/085—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using digital techniques
Definitions
- the invention relates to a method according to the preamble of patent claim 1.
- a hands-free device known per se has a transmission signal branch via which the signals picked up by a microphone MK are sent via a microphone amplifier MV and a transmission attenuation stage SD to an electronic fork EG, for example.
- the electronic fork EG is preferably connected to an analog subscriber line, a so-called a / b line.
- the hands-free device also has a reception signal branch, via which the signals applied to the electronic fork EG are sent to a loudspeaker LP via an amplifier V, a reception attenuation stage ED and a playback amplifier WV.
- the transmission and reception damping stages are controlled by a stroke control HS.
- the stroke control HS is connected, for example, via a logarithmic amplifier LV 1 to the output-side connection of the transmission attenuation stage SD, and via a logarithmic amplifier LV2 to the input-side connection of the reception attenuation stage ED.
- the hands-free device is installed, for example, in a communication terminal.
- the transmission damping stage SD in the transmission signal branch or the reception damping stage ED in the reception signal branch is damped by the set stroke via the stroke control HS.
- the stroke control HS is connected on the input side via two or more logarithmic amplifiers LV1, LV2 to the transmit signal and receive signal branches. In the stroke control HS, a decision is made as to which of the speech directions, transmit signal or receive signal branches are damped or undamped around the stroke.
- this stroke is around 30 to 40 dB.
- the impression of a dead line can arise.
- the stroke must now be measured on an open line.
- the hands-free system must not show a whistle when the line is open, i.e. not closed.
- this state of the open line is not a state of conversation.
- the set stroke could be reduced by approx. 6 to 10 dB in order to significantly improve the intercom behavior.
- the known analog hands-free devices are tuned via setting resistors so that there is no whistling tendency when the line is open. This means that the hands-free speakers are not optimally adjusted and cannot be optimized during operation.
- the invention is based on the object of specifying a method for stroke control of a hands-free device which enables a reduced stroke in the conversation state. This object is achieved by the entitlement l specified in the patent applica ⁇ characteristics.
- the method according to the invention ultimately detects an open or a closed subscriber line.
- the hands-free control stroke is set accordingly.
- an optimization of the listening back in connection with a multi-stage adjustment of the control stroke is possible. This leads to a further improvement in the two-way communication.
- FIG. 2 shows a supplemented hands-free device which is suitable for carrying out the method according to the invention.
- the modules required for this are a microprocessor P, an output module AB and an analog-digital converter AD.
- the output module AB is connected to the processor P, for example, via a bus, which is not described in more detail.
- the processor P is also connected to the stroke control HS and via a serial bus SB to the analog digital converter AD.
- the processor P feeds signals into the transmission signal branch via the output module AB.
- the output module AB is connected, for example, to the output end of the transmission attenuation stage SD.
- the signals can contain one or more tones. These signals reach the receiver via the fork coupling GK. catch signal branch.
- the level of these signals fed into the transmission signal branch is measured in the reception signal branch.
- the analog digital converter AD is connected to the input-side connection of the reception attenuation stage ED.
- the value of the level is calculated in the processor P, and a stroke value for the control of the hands-free device is set in the stroke control HS in accordance with this value.
- the level value measured in the received signal branch can be used to determine whether the hands-free device is located on an open connecting line a / b or not. If the speakerphone or the communication terminal containing it is not on an open line, the hub is set to the preset hub values for hands-free operation.
- the signals or tones fed into the transmission signal branch should preferably be counted in such a way that there is no conflict with DTMF frequencies or interference is prevented as far as possible. It may also be necessary to differentiate between an outgoing and an incoming call in order to avoid calibration during an incoming call.
- the communication terminal can thus be set to strokes in the range of 20 to 34 dB, for example, which leads to a corresponding improvement in the intercom behavior. In addition, it would not whistle even if the line was not or poorly terminated. There would also be no whistling during calibration, since it is preferable to start with a high stroke.
- a connection-specific adaptation is also possible using the call number display (CLIP function) announced by DeutscheInstitut, in that the necessary parameters are automatically saved for each subscriber. When the corresponding subscriber calls, these parameters can be called up and the hands-free system set accordingly.
- CLIP function call number display
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Function (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19732440 | 1997-07-28 | ||
| DE19732440 | 1997-07-28 | ||
| PCT/DE1998/001041 WO1999007134A1 (de) | 1997-07-28 | 1998-04-09 | Freisprecheinrichtung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1000501A1 true EP1000501A1 (de) | 2000-05-17 |
Family
ID=7837133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98931905A Ceased EP1000501A1 (de) | 1997-07-28 | 1998-04-09 | Freisprecheinrichtung |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1000501A1 (de) |
| WO (1) | WO1999007134A1 (de) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5735457A (en) * | 1980-08-12 | 1982-02-26 | Oki Electric Ind Co Ltd | Loudspeaker telephone set system |
| JPS5797262A (en) * | 1980-12-09 | 1982-06-16 | Nippon Telegr & Teleph Corp <Ntt> | Loud speaker telephone set system |
| US5014294A (en) * | 1990-02-01 | 1991-05-07 | Motorola Inc. | Speakerphone for cellular telephones with howl prevention, detection, elimination and determination |
-
1998
- 1998-04-09 WO PCT/DE1998/001041 patent/WO1999007134A1/de not_active Ceased
- 1998-04-09 EP EP98931905A patent/EP1000501A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9907134A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1999007134A1 (de) | 1999-02-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20000121 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE ES FR GB IT NL |
|
| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
| RTI1 | Title (correction) |
Free format text: HANDS-FREE SYSTEM |
|
| RTI1 | Title (correction) |
Free format text: HANDS-FREE SYSTEM |
|
| 17Q | First examination report despatched |
Effective date: 20020307 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
| 18R | Application refused |
Effective date: 20020913 |