Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04M—TELEPHONIC COMMUNICATION
  • H04M1/00—Substation equipment, e.g. for use by subscribers
  • H04M1/02—Constructional features of telephone sets
  • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
  • H04M1/035—Improving the acoustic characteristics by means of constructional features of the housing, e.g. ribs, walls, resonating chambers or cavities

Definitions

• Wireless telephone handset having a high bandwidth electroacoustic string.
• the present invention relates to a wireless telephone handset comprising an electroacoustic string having a wide bandwidth.
• wireless handsets whether used in local area networks (residence) or in wide area networks (GSM), are generally small in size so that they can be stored in a user's pocket.
• the loudspeakers with which these handsets are increasingly equipped, including speakers for hands-free use, are themselves small. This results in limited performance of these speakers, especially with respect to their bandwidth.
• a telephone handset comprising a loudspeaker in front of which is formed a cavity forming a Helmholtz resonator for filtering a frequency band in the midrange.
• An object of the invention is to provide a wireless telephone handset having an improved bandwidth compared to existing handsets.
• a wireless telephone handset comprising a housing enclosing a processing unit
• acoustic device with a microphone and an electromagnetic loudspeaker the loudspeaker being mounted on a wall of an enclosure which extends at the rear of the loudspeaker and which has at least one vent having appropriate dimensions to form a Helmholtz resonator with the enclosure.
• the acoustic response of the speaker is improved in the low frequency range so that the bandwidth of the acoustic system is enlarged.
• said at least one vent opens into a receiving compartment of a handset power supply battery.
• FIG. 1 is a partially cutaway perspective view of a telephone handset according to a general principle of the invention
• FIG. 2 is a schematic representation of the acoustic string of the telephone handset according to
• the telephone handset comprises a housing 18 enclosing an acoustic processing unit 1, known per se, with which are associated a microphone 2, an earphone 3 connected to an amplification device 4, and an electromagnetic loudspeaker connected to an amplification member 6. Also in a manner known per se, the loudspeaker 5 is mounted on a wall of an enclosure 7 so that the enclosure 7 is the rear of the speaker 5.
• the handset further comprises a housing element 8 spaced from the enclosure 7 and defining an intermediate space 9. Opposite the speaker 5, the housing element 8 has openings 10 .
• the chamber 7 is equipped with a vent 11 having dimensions adapted to form with the chamber 7 a Helmholtz resonator tuned to the volume of the chamber 7.
• the vent 11 has an outlet orifice 12 which opens into the intermediate volume 9 and is offset relative to the openings 10 of the housing element. This arrangement makes it possible to prevent the entry of dust into the enclosure 7 via the vent 11.
• the electromagnetic speaker which opens on the back of the handset is as previously fixed to a wall of an enclosure 7 which is behind the speaker 5.
• the speaker 7 is here provided with two vents 11 having dimensions adapted to form with the enclosure 7 at the rear of the loudspeaker 5 a Helmholtz resonator tuned to the volume of the enclosure 7.
• the vents 11 here have a port of output 12 opening into a compartment 13 receiving the batteries 14 power supply of the handset.
• the compartment 13 is closed by a lid 15 provided with openings 16 which are 1 to the opening 12.
• a felt 17 (partially torn off in FIG. 3 to reveal the openings 16), allowing the air to pass, extends over the openings 16 in the compartment 13 to prevent the - Troduction of dirt in the compartment 13 without degrading the acoustic performance.
• the handset may comprise a single vent passing through the wall of the enclosure or several vents so that their dimensions are better adapted to the dimensions of the enclosure 7 and, possibly to the dimensions of the compartment 13 so that the resonator obtained remains granted on the internal volume of the enclosure 7.
• the vent opens near the openings facing the speaker, it can provide a fine felt allowing air to filter the impurities without degrading the acoustic performance of the speaker.
• the earphone 3 in front of the speaker 5 and connect the earphone 3 to the amplification member 6 from above. 5 by means of a high-pass filter.
• the performance of the speaker 1 according to the invention can also be provided to remove the earpiece, the individual listening is then on the speaker powered by a low level signal.

Landscapes

• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Telephone Set Structure (AREA)
• Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=40459257

Family Applications (1)

Country Status (6)

Families Citing this family (4)

Family Cites Families (10)

• 2008
  • 2008-08-04 FR FR0804423A patent/FR2934738B1/fr not_active Expired - Fee Related
• 2009
  • 2009-07-30 WO PCT/FR2009/000954 patent/WO2010015741A2/fr not_active Ceased
  • 2009-07-30 CN CN200980134935.6A patent/CN102138319B/zh not_active Expired - Fee Related
  • 2009-07-30 US US13/057,246 patent/US20110130175A1/en not_active Abandoned
  • 2009-07-30 EP EP09784322A patent/EP2311243A2/de not_active Ceased
  • 2009-07-30 BR BRPI0917244A patent/BRPI0917244A2/pt not_active Application Discontinuation

Non-Patent Citations (1)

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