EP0916218A1 - Method and apparatus for applying a user selected frequency response pattern to audio signals provided to a cellular telephone speaker - Google Patents
Method and apparatus for applying a user selected frequency response pattern to audio signals provided to a cellular telephone speakerInfo
- Publication number
- EP0916218A1 EP0916218A1 EP97937094A EP97937094A EP0916218A1 EP 0916218 A1 EP0916218 A1 EP 0916218A1 EP 97937094 A EP97937094 A EP 97937094A EP 97937094 A EP97937094 A EP 97937094A EP 0916218 A1 EP0916218 A1 EP 0916218A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- frequency response
- user
- cellular telephone
- filter
- audio signals
- 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.)
- Withdrawn
Links
- 230000004044 response Effects 0.000 title claims abstract description 78
- 230000001413 cellular effect Effects 0.000 title claims abstract description 47
- 230000005236 sound signal Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims description 11
- 238000012545 processing Methods 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims description 16
- 230000004913 activation Effects 0.000 claims 2
- 230000006872 improvement Effects 0.000 abstract description 3
- 208000011755 Hearing abnormality Diseases 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6016—Substation equipment, e.g. for use by subscribers including speech amplifiers in the receiver circuit
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/02—Manually-operated control
- H03G5/025—Equalizers; Volume or gain control in limited frequency bands
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
Definitions
- the invention generally relates to cellular telephones and other mobile telephones and in particular to the audio output of a cellular telephone.
- a user may operate the cellular telephone is a noisy environment wherein the sound spectrum of the noise is skewed toward higher or lower frequencies. Examples include manufacturing environments wherein noise may be either primarily high pitched or primarily low pitched. A cellular telephone providing a fairly flat frequency response to output voice signals may not be ideal for such situations. In other situations, as a result of signal transmission problems, the received voice signal of the other party may be skewed in frequency. Indeed, the hearing range of the user may, itself, be skewed either toward higher or lower frequencies such that a flat cellular telephone output frequency response may not be ideal regardless of the presence of noise or transmission problems.
- a cellular telephone or other mobile telephone having an audio speaker or other audio transducer is provided with a means for receiving audio signals and a means for filtering the audio signals to alter a frequency response pattern thereof.
- the means for filtering operates in response to user control to allow the user to adjust the frequency response pattern as desired. In this manner, the user may adjust the frequency response to compensate for local noise or transmission problems or for hearing abnormalities to thereby allow the user to hear the other party to a telephone call more clearly. At minimum, the user may gain at least a perceived listening improvement.
- the means filtering the audio signals operates to filter the audio signals provided to the speaker in accordance with one of a predetermined set of frequency response patterns.
- the cellular telephone includes a means for storing selected sets of audio frequency filter parameters and the user selects one of the sets of filter parameters by pressing a corresponding button on a front control panel of the cellular telephone.
- the cellular telephone includes an equalizer scroll bar allowing a larger number of sets of filter parameters to be conveniently accessed.
- DSP digital signal processing
- FIG. 1 is a graph of a typical frequency response pattern for a cellular telephone configured in accordance with the prior art
- FIG. 2 is a block diagram of a cellular telephone configured, in accordance with a first exemplary embodiment of the invention, with a set of frequency response selection buttons allowing a user to select one of a set of predetermined frequency response patterns;
- FIGS. 3A - 3D are graphs illustrating exemplary frequency response patterns employed by the cellular telephone of FIG. 2;
- FIG. 4 is a block diagram of pertinent internal components of the cellular telephone of FIG. 2;
- FIG. 5 is a block diagram of a cellular telephone configured, in accordance with a second exemplary embodiment of the invention, with a single frequency response selection scroll bar allowing the user to scroll through a set of predetermined frequency response patterns.
- FIG. 2 illustrates the external components of a cellular telephone 10 having a front control panel 11 including a keypad 12, a PHONE button 14, a SEND button 16, a display 18 and a set of equalizer buttons generally denoted 20. In a preferred embodiment, a single button is used to scroll through the equalization options.
- Cellular telephone 10 also includes a microphone 22, a speaker 24, and an antenna 26.
- a user presses PHONE button 14 to activate cellular telephone 10, enters a telephone number to be dialed using keypad 12, then presses SEND button 16 to transmit the telephone number to a local cellular base station (not shown) to thereby initiate a telephone call to a remote user.
- the user speaks through microphone 22 and hears the voice of the other party to the telephone call through speaker 24.
- Equalizer buttons 20 control internal components (to be described in greater detail below) for adjusting the frequency response of audio signals output through speaker 24, perhaps to allow the other party to be more easily heard.
- the four buttons provide frequency response patterns having, respectively, enhanced high and low frequencies, enhanced high frequencies only, enhanced low frequencies only, and reduced high and low frequencies.
- Graphs illustrating the four frequency response patterns (in arbitrary units) are provided in FIGS. 3A - 3D.
- more or fewer equalizer buttons 20 are provided, or alternative frequency response patterns are provided, or both.
- any desired frequency response pattern can be pre-programmed by the manufacturer.
- the front panel of the cellular telephone includes an equalizer scroll bar allowing the user to scroll through a greater number of frequency response patterns than can be accommodated with separate equalization buttons 20 each controlling only a single corresponding frequency response pattern.
- the frequency response pattern corresponding to the pressed button is applied to audio signals provided to speaker 24, i.e. the audio signals are filtered in accordance with the selected frequency response pattern. Thereafter, the voice of the other party to the call (and all other sounds to be output through the speaker) are adjusted in accordance with the selected frequency response.
- the user may select frequency response 27 of FIG. 3A which de-emphasizes center frequencies 28. If the user has trouble hearing higher frequencies, he or she may select frequency response 29 of FIG. 3B which enhances higher frequencies 30.
- the user may select frequency response pattern 31 of FIG. 3C to thereby increase low frequencies 32 to compensate for the noise.
- the user may select frequency response pattern 33 of FIG. 3D to de-emphasize both high frequencies 34 and low frequencies 35.
- buttons employed for selecting frequency response patterns serve other uses as well.
- a MODE button (not shown) is provided to allow selection of the operational mode of the buttons.
- the buttons operate to adjust the frequency response only while placed in the appropriate mode.
- indicia may be provided on cellular telephone front control panel 11 adjacent to buttons 20 identifying the frequency response pattern associated with each button.
- suitable identifying graphics or text may be presented on the display.
- the shape of the corresponding frequency response pattern may be displayed graphically within display 24. Such a graphical display is particularly desirable for embodiments wherein the buttons serve multiple purposes thereby allowing the currently selected functions of the buttons to be properly identified.
- FIG. 4 illustrates pertinent internal components of cellular telephone 10. More specifically, FIG. 4 illustrates that cellular telephone 10 includes a control unit 40, a DSP 42, a receiver /transmitter unit 44, a digital-to-analog (D/A) converter 46 and an analog-to-digital (A/D) converter 48.
- DSP 42 further includes a vocoder encoder 50, a vocoder decoder 52, an equalization filter 54 and a filter table 56.
- Front control panel 11, microphone 22, speaker 24 and antenna 26 are also shown symbolically in FIG. 4.
- Vocoder encoder 50 of DSP 42 converts the voice signals into vocoder packets.
- the packets are encoded, by units not separately shown, using a cellular transmission protocol such as Code Division Multiple Access (CDMA).
- CDMA Code Division Multiple Access
- the encoded signals are routed to receiver /transmitter 44 for transmission via antenna 26 to the local base station (not shown) and forwarded therefrom to a remote telephone (also not shown).
- Voice signals in the form of encoded vocoder data packets, are received by DSP 42 either directly from receive /transmitter unit 44 or from the additional CDMA processing units not separately shown.
- the vocoder packets are decoded by vocoder decoder 52 of DSP 42 into a digital speech signal.
- the digital speech signal is routed through equalization filter 54 which, if controlled to do so, filters the speech signal in accordance with a selected set of filtering parameters read from filter table 56.
- the digital filtered signal is converted to an analog signal by D/A converter 46 then provided to speaker 24. All of the forgoing operations are performed under the control of control unit 40.
- control unit 40 receives the user selection and controls DSP 42 to adjust the frequency response accordingly via equalization filter 54. More specifically, DSP 42 reads predetermined digital filter parameters corresponding to the selected frequency response pattern from filter table 42, then equalization filter 54 filters the signal using the selected filter parameters in accordance with otherwise conventional techniques.
- Filter table 42 may be a ROM, RAM or similar storage device having the filter coefficients stored therein for the four frequency response patterns of FIGS. 3A - 3D. If the user does not select a specific frequency response pattern, then equalization filter 54 either does not filter the digital signal or it employs a default set of filter parameters read from filter table 56.
- the resulting filtered digital speech signal is converted to an analog signal by D/A converter 46 for output to speaker 24.
- the user thereby hears the voice of the other party (or whatever other sounds are received by the telephone) subject to the selected frequency response pattern.
- the user may change the frequency response pattern any number of times during a single telephone call as needed or desired.
- the filtering is applied only to the received signals. Hence, the voice of the user is not filtered for the other party, although such a feature could be provided in alternative embodiments.
- Additional conventional filters may be provided within the DSP, or in conjunction therewith, for performing conventional filtering operations such as noise reduction or smoothing.
- FIGS. 2 - 4 illustrate a first embodiment wherein separate buttons 20 are provided for each of a predetermined set of frequency response patterns.
- a single scroll bar 120 is provided for selecting the frequency response.
- the arrangement of FIG. 5 is similar to that of FIG. 2 and like components are identified with like reference numerals incremented by 100. Only pertinent differences will be described in detail.
- FIG. 5 illustrates a cellular telephone 110 having a front control panel 111 including a keypad 112, a PHONE button 114, a SEND button 116, a display 118 and single scroll bar 120.
- Cellular telephone 110 also includes a microphone 122, a speaker 124, and an antenna 126.
- Scroll bar 120 allows the user to scroll through a set of predetermined frequency response patterns.
- the patterns are pre-stored as filter parameters in a filter table accessible by an equalization filter (neither shown in FIG. 5).
- a graphic is presented within display 120 (under control of an internal control unit also not shown) illustrating the currently selected frequency response pattern.
- any number of different predetermined frequency response patterns may be provided.
- the user simply scrolls through the patterns until finding one that provides the greatest clarity or is otherwise most desirable. Deactivation of the frequency pattern adjustment is achieved by scrolling until reaching the end of the predetermined patterns, after which either no filtering or default filtering is again employed.
- any desired frequency response pattern may be provided by the manufacturer merely by pre-programming the filter table with appropriate values.
- the filter parameters may be set to yield frequency response patterns substantially as shown in FIGS. 3A - 3D.
- appropriate filter parameters may be determined empirically by testing actual users with a variety of frequency response patterns to determine which are most useful or desired.
- a wide range of possible techniques for determining the appropriate filter parameters for storage in the filter table may be employed consistent with the general principles of the invention.
- a filter table is not necessary. Rather, any suitable means for filtering may be employed.
- the audio signals subsequent to conversion to analog signals may be routed through electronic circuitry configured to directly vary the electrical characteristics of the audio signals.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Function (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US69071096A | 1996-07-31 | 1996-07-31 | |
US690710 | 1996-07-31 | ||
PCT/US1997/013593 WO1998005150A1 (en) | 1996-07-31 | 1997-07-31 | Method and apparatus for applying a user selected frequency response pattern to audio signals provided to a cellular telephone speaker |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0916218A1 true EP0916218A1 (en) | 1999-05-19 |
Family
ID=24773621
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97937094A Withdrawn EP0916218A1 (en) | 1996-07-31 | 1997-07-31 | Method and apparatus for applying a user selected frequency response pattern to audio signals provided to a cellular telephone speaker |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0916218A1 (en) |
JP (1) | JP2000516413A (en) |
KR (1) | KR20000029682A (en) |
CN (1) | CN1227024A (en) |
AU (1) | AU3969397A (en) |
BR (1) | BR9710632A (en) |
CA (1) | CA2261727A1 (en) |
HU (1) | HUP0000580A2 (en) |
IL (1) | IL128063A0 (en) |
WO (1) | WO1998005150A1 (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU5234299A (en) * | 1998-08-03 | 2000-02-28 | Ericsson Inc. | Radiotelephone with variable frequency response |
FR2790165B1 (en) * | 1999-02-19 | 2001-05-11 | France Telecom | TELEPHONE SET INCLUDING MEANS FOR HEARING CORRECTION |
US7181297B1 (en) | 1999-09-28 | 2007-02-20 | Sound Id | System and method for delivering customized audio data |
WO2001030049A1 (en) | 1999-10-19 | 2001-04-26 | Fujitsu Limited | Received speech processing unit and received speech reproducing unit |
JP3769433B2 (en) * | 1999-11-01 | 2006-04-26 | 株式会社ケンウッド | Communication terminal |
GB2377353B (en) | 2001-07-03 | 2005-06-29 | Mitel Corp | Loudspeaker telephone equalization method and equalizer for loudspeaker telephone |
KR100426374B1 (en) * | 2001-08-17 | 2004-04-08 | 엘지전자 주식회사 | Audio signal control circuit in mobile phone |
US6639987B2 (en) * | 2001-12-11 | 2003-10-28 | Motorola, Inc. | Communication device with active equalization and method therefor |
US20040131206A1 (en) * | 2003-01-08 | 2004-07-08 | James Cao | User selectable sound enhancement feature |
KR100707339B1 (en) | 2004-12-23 | 2007-04-13 | 권대훈 | Equalization apparatus and method based on audiogram |
KR101136092B1 (en) * | 2007-03-28 | 2012-04-17 | 종 해 김 | System and method for security of credit card of mobilephone terminal. |
US8325931B2 (en) | 2008-05-02 | 2012-12-04 | Bose Corporation | Detecting a loudspeaker configuration |
US8063698B2 (en) | 2008-05-02 | 2011-11-22 | Bose Corporation | Bypassing amplification |
EP2120433B1 (en) | 2008-05-12 | 2019-06-19 | BlackBerry Limited | User-selectable equalizer for voice calls |
CN102447445B (en) * | 2010-09-30 | 2016-04-20 | 无锡中感微电子股份有限公司 | A kind of method of audio frequency parameter equilibrium and audio frequency parameter equalizer |
US8767996B1 (en) | 2014-01-06 | 2014-07-01 | Alpine Electronics of Silicon Valley, Inc. | Methods and devices for reproducing audio signals with a haptic apparatus on acoustic headphones |
US8977376B1 (en) | 2014-01-06 | 2015-03-10 | Alpine Electronics of Silicon Valley, Inc. | Reproducing audio signals with a haptic apparatus on acoustic headphones and their calibration and measurement |
US10986454B2 (en) | 2014-01-06 | 2021-04-20 | Alpine Electronics of Silicon Valley, Inc. | Sound normalization and frequency remapping using haptic feedback |
US9706302B2 (en) * | 2014-02-05 | 2017-07-11 | Sennheiser Communications A/S | Loudspeaker system comprising equalization dependent on volume control |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4761829A (en) * | 1985-11-27 | 1988-08-02 | Motorola Inc. | Adaptive signal strength and/or ambient noise driven audio shaping system |
JPH01123554A (en) * | 1987-11-09 | 1989-05-16 | Toshiba Corp | Telephone set |
FR2633125A1 (en) * | 1988-06-17 | 1989-12-22 | Sgs Thomson Microelectronics | Acoustic apparatus with voice filtering card |
US5027410A (en) * | 1988-11-10 | 1991-06-25 | Wisconsin Alumni Research Foundation | Adaptive, programmable signal processing and filtering for hearing aids |
JPH0630090A (en) * | 1992-07-08 | 1994-02-04 | Mitsubishi Electric Corp | Telephone set with sound volume control function |
CA2107316C (en) * | 1992-11-02 | 1996-12-17 | Roger David Benning | Electronic cancellation of ambient noise in telephone receivers |
JPH07273840A (en) * | 1994-03-25 | 1995-10-20 | Nec Corp | Mobile telephone set with voice band control function |
FI99062C (en) * | 1995-10-05 | 1997-09-25 | Nokia Mobile Phones Ltd | Voice signal equalization in a mobile phone |
-
1997
- 1997-07-31 AU AU39693/97A patent/AU3969397A/en not_active Abandoned
- 1997-07-31 EP EP97937094A patent/EP0916218A1/en not_active Withdrawn
- 1997-07-31 JP JP10509168A patent/JP2000516413A/en active Pending
- 1997-07-31 KR KR1019997000760A patent/KR20000029682A/en not_active Application Discontinuation
- 1997-07-31 BR BR9710632-1A patent/BR9710632A/en not_active Application Discontinuation
- 1997-07-31 CN CN97196879A patent/CN1227024A/en active Pending
- 1997-07-31 CA CA002261727A patent/CA2261727A1/en not_active Abandoned
- 1997-07-31 WO PCT/US1997/013593 patent/WO1998005150A1/en not_active Application Discontinuation
- 1997-07-31 IL IL12806397A patent/IL128063A0/en unknown
- 1997-07-31 HU HU0000580A patent/HUP0000580A2/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9805150A1 * |
Also Published As
Publication number | Publication date |
---|---|
HUP0000580A2 (en) | 2000-06-28 |
CA2261727A1 (en) | 1998-02-05 |
CN1227024A (en) | 1999-08-25 |
WO1998005150A1 (en) | 1998-02-05 |
KR20000029682A (en) | 2000-05-25 |
AU3969397A (en) | 1998-02-20 |
IL128063A0 (en) | 1999-11-30 |
JP2000516413A (en) | 2000-12-05 |
BR9710632A (en) | 2000-01-11 |
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