EP1499157A1 - Circuit de commande pour haut parleur et terminal mobile - Google Patents

Circuit de commande pour haut parleur et terminal mobile Download PDF

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Publication number
EP1499157A1
EP1499157A1 EP03016331A EP03016331A EP1499157A1 EP 1499157 A1 EP1499157 A1 EP 1499157A1 EP 03016331 A EP03016331 A EP 03016331A EP 03016331 A EP03016331 A EP 03016331A EP 1499157 A1 EP1499157 A1 EP 1499157A1
Authority
EP
European Patent Office
Prior art keywords
pass filter
signal
driving circuit
loudspeaker
band
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Withdrawn
Application number
EP03016331A
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German (de)
English (en)
Inventor
Palle Rye
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BenQ Mobile GmbH and Co OHG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP03016331A priority Critical patent/EP1499157A1/fr
Publication of EP1499157A1 publication Critical patent/EP1499157A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response

Definitions

  • a perfect example of such a portable electronic device is a mobile terminal, such as a mobile phone which has during the past decade become smaller than ever.
  • a problem of using a simple high-pass filter is its adverse effect on the sound quality. It is an objective of the present invention to bring about a speaker driving circuit, by using which it is possible to output audio signals where the part of the signal spectrum including the resonance frequency of the loudspeaker are either attenuated or not. This can be achieved by using the speaker driving circuit as described in independent patent claim 1.
  • An advantage of such a speaker driving circuit is that some signal types can then be played back by using a higher volume without damaging the loudspeaker than would be possible without the speaker driving circuit.
  • Another objective of the present invention is to bring about a mobile terminal comprising such a speaker driving circuit.
  • An advantage of such a mobile terminal is that then in the mobile terminal it is possible to filter the signal to be feed to the loudspeaker in different manners, i.e. to reduce the signal component including frequencies at the resonance frequency of the loudspeaker of the mobile terminal.
  • An aspect of the present invention is to use a high-pass filter before outputting a signal representing a ringing tone by a loudspeaker.
  • the high-pass filter has a cut-off frequency at or above a resonance frequency of the loudspeaker.
  • a further objective of the present invention is to enable the using of some ringing tones without damaging the loudspeaker. This can be achieved by using a high-pass filter before outputting a signal representing a ringing tone by a loudspeaker as descibed in independent patent claim 7.
  • FIG. 1 shows a speaker driving circuit 10 according to the present invention.
  • the speaker driving circuit 10 includes a band-pass filter 109 and a high-pass filter 111.
  • the band-pass filter 109 has cut-off frequencies outside GSM voice band, i.e. at 300 Hz and at 3.4 kHz, and it is mostly used in order to attenuate out-of-band noise caused by the audio front end 103.
  • the audio front end 103 includes an amplifier 173 and three inputs (INPUT1, INPUT2, INPUT3). Further there are a first and a second control channel (CONTROL CHANNEL A, CONTROL CHANNEL B) which are used to give input to a central processing unit CPU 171 of the audio front end 103.
  • the CPU 171 operates then responsively to signal obtained through CONTROL CHANNEL A and B three switches SW1, SW2, SW3 used in selecting which INPUT1, INPUT2, and INPUT3 is used for amplifying.
  • the output of the amplifier 173 is then connected to a loudspeaker 101 for the reproduction of an audible sound.
  • speech information SPCH is received via a radio modem 151.
  • the modem 151 passes the speech information SPCH received to a processor unit 105.
  • the speech information SPCH is usually coded using some coding, mostly for bandwidth efficiency and error recovery purposes.
  • the speech information SPCH has then to be decoded in a codec 121 which corresponds to a soft- or hard-coded algorithm for obtaining a suitable sampling which can be used for speech reproduction.
  • This signal SIG1 which will be used for speech reproduction will be outputted from the codec 121 to a preamplifier 107.
  • the mobile network under which the mobile terminal is roaming starts paging the mobile terminal.
  • the mobile terminal then receives a paging signal RNG via the same radio modem 151.
  • This is handled in the processor 105 in a similar manner as the speech information SPCH but instead of passing the paging signal RNG to a codec 121 it activates a ringer 123.
  • the ringer 123 gives a signal SIG2 representing ringing tone which is then further passed to the preamplifier 107.
  • the signal SIG2 representing a ringing tone is preferably a signal having a substantially square waveform in the time-voltage space. This corresponds to connecting the output of a voltage source on and off for a short period in the manner usually done in a buzzer. Also other signal forms for the signal SIG2 representing a ringing tone can be used.
  • the preamplifier 107 gives from its output (PREAMP OUTPUT) a preamplified signal SIG.
  • a preamplified signal SIG typically, for a mobile terminal there will be generated no signal SIG2 representing a ringing tone when there is an ongoing call so that speech information SIG1 is fed to the preamplifier 107.
  • the preamplified signal SIG is passed to the band-pass filter 109 and to the high-pass filter 111.
  • the band-pass filter 109 is connected to a first input INPUT1 and the second high-pass filter is connected to a second input INPUT2 of the audio front end 103.
  • the signal SF1 received from the band-pass filter 109 is different from the signal SF2 received from the high-pass filter 111 in the sense that because now the cut-off frequency of the high-pass filter 111 is above the resonance frequency of the loudspeaker 101.
  • the main purpose of the high-pass filter 111 is to remove the lowest frequency part of the signal. This is particularly advantageous when the signal to be amplified in the amplifier 173 is such a signal as the signal SIG2 representing a ringing tone, especially when the ringing tone is created by a buzzer or has otherwise a substantially square waveform in time-voltage space.
  • the lowest frequency part carries most energy of the signal. Further, it causes the membrane of the loudspeaker 101 to vibrate too much therefore possibly damaging the loudspeaker especially when the ringer volume is high.
  • the tone can still be perceived as having the original pitch.
  • audio front end 103 comprises the switches SW1, SW2 and SW3 used to select the correct input.
  • switches SW1, SW2 and SW3 used to select the correct input.
  • a selection can be made earlier in the signal path. In other words, one can select between the filters 109 and 111.
  • the selection can be made based on the signal type or class. For example, all ringing tones or signals from a specific signal source, such as an FM radio, are all led to the high-pass filter 111 whereas all other signals are led to the band-pass filter 109. Also such a solution where a digital sound processing apparatus is used, based on the low-frequency content of the signal (such as SIG1) the selecting means (SW1, SW2) are operated to select the most suitable high-pass filter.
  • the selection can also be made responsively to the state of the portable electronic device. Examples of such states are "ongoing call”, and "paging".
  • Figure 2 illustrates the band-pass filter 109 and the high-pass filter 111. Both filters 109, 111 are connected to the preamplifier 107 output.
  • the band-pass filter 109 is made up by a high-pass filter and a low-pass filter and has resistors R 1 , R 5 and R 6 , and capacitances C 1 , C 2 , C 3 and C 4 for selecting the cut-off frequency.
  • the high-pass filter 111 has a higher cut-off frequency than the band-pass filter 109.
  • the cut-off frequency is higher than the resonance frequency of the loudspeaker.
  • the high-pass filter 111 comprises resistors R 2 , R 3 , and R 4 , and capacitances C 5 and C 6 .
  • Figure 3 shows the resulting frequency response of the speaker driving circuit 10 when the band-pass filter 109 is used; and Figure 4 shows the resulting frequency response of the speaker driving circuit 10 when the high-pass filter 111 is used.
  • Figure 3 shows the resulting frequency response of the speaker driving circuit 10 when the band-pass filter 109 is used; and Figure 4 shows the resulting frequency response of the speaker driving circuit 10 when the high-pass filter 111 is used.
  • the band-pass filter 109 and the high-pass filter 111 can be implemented as a digital filter as well. In this case the filtering will most conveniently be performed in the processor unit 105.
  • a GSM terminal a CDMA, WCDMA, GPRS, UMTS or any other suitable mobile terminal can be used.
  • the invention can be included in any other portable electronic device, such as a portable radio, CD- or MP3 player.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)
EP03016331A 2003-07-18 2003-07-18 Circuit de commande pour haut parleur et terminal mobile Withdrawn EP1499157A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03016331A EP1499157A1 (fr) 2003-07-18 2003-07-18 Circuit de commande pour haut parleur et terminal mobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03016331A EP1499157A1 (fr) 2003-07-18 2003-07-18 Circuit de commande pour haut parleur et terminal mobile

Publications (1)

Publication Number Publication Date
EP1499157A1 true EP1499157A1 (fr) 2005-01-19

Family

ID=33462156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03016331A Withdrawn EP1499157A1 (fr) 2003-07-18 2003-07-18 Circuit de commande pour haut parleur et terminal mobile

Country Status (1)

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EP (1) EP1499157A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014021670A1 (fr) * 2012-08-03 2014-02-06 Samsung Electronics Co., Ltd. Appareil mobile et son procédé de commande

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3277374A (en) * 1962-09-24 1966-10-04 Masatoshi Shimada Combined transceiver and radio broadcast receiver
US5524061A (en) * 1994-08-29 1996-06-04 Motorola, Inc. Dual mode transducer for a portable receiver
DE19548149A1 (de) * 1995-12-22 1997-06-26 Opel Adam Ag Audio-Einrichtung in einem Kraftfahrzeug
DE4227601C1 (de) * 1992-08-20 1997-07-10 Siemens Ag Tonrufansteuerung für Lautsprecher
EP0888032A1 (fr) * 1997-06-24 1998-12-30 Matsushita Electric Industrial Co., Ltd. Arrangement à transducteur électromécanique acoustique
EP1135002A2 (fr) * 2000-03-13 2001-09-19 Sony Corporation Circuit de commande pour haut-parleur

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3277374A (en) * 1962-09-24 1966-10-04 Masatoshi Shimada Combined transceiver and radio broadcast receiver
DE4227601C1 (de) * 1992-08-20 1997-07-10 Siemens Ag Tonrufansteuerung für Lautsprecher
US5524061A (en) * 1994-08-29 1996-06-04 Motorola, Inc. Dual mode transducer for a portable receiver
DE19548149A1 (de) * 1995-12-22 1997-06-26 Opel Adam Ag Audio-Einrichtung in einem Kraftfahrzeug
EP0888032A1 (fr) * 1997-06-24 1998-12-30 Matsushita Electric Industrial Co., Ltd. Arrangement à transducteur électromécanique acoustique
EP1135002A2 (fr) * 2000-03-13 2001-09-19 Sony Corporation Circuit de commande pour haut-parleur

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014021670A1 (fr) * 2012-08-03 2014-02-06 Samsung Electronics Co., Ltd. Appareil mobile et son procédé de commande
US9241215B2 (en) 2012-08-03 2016-01-19 Samsung Electronics Co., Ltd Mobile apparatus and control method thereof
US9525942B2 (en) 2012-08-03 2016-12-20 Samsung Electronics Co., Ltd Mobile apparatus and control method thereof
US10051368B2 (en) 2012-08-03 2018-08-14 Samsung Electronics Co., Ltd Mobile apparatus and control method thereof

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