WO2002091603A1 - A wireless hand-free unit and the method of communication via the hand-free unit - Google Patents

A wireless hand-free unit and the method of communication via the hand-free unit Download PDF

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Publication number
WO2002091603A1
WO2002091603A1 PCT/KR2002/000741 KR0200741W WO02091603A1 WO 2002091603 A1 WO2002091603 A1 WO 2002091603A1 KR 0200741 W KR0200741 W KR 0200741W WO 02091603 A1 WO02091603 A1 WO 02091603A1
Authority
WO
WIPO (PCT)
Prior art keywords
hands
free device
cellular phone
transmission
speaker
Prior art date
Application number
PCT/KR2002/000741
Other languages
French (fr)
Inventor
Kye-Kwang Lee
Jeong-Seo Park
Original Assignee
Sung Jin Techwin Co., Ltd.
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
Priority claimed from KR1020020017615A external-priority patent/KR20020086224A/en
Application filed by Sung Jin Techwin Co., Ltd. filed Critical Sung Jin Techwin Co., Ltd.
Publication of WO2002091603A1 publication Critical patent/WO2002091603A1/en

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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
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • H04M1/6041—Portable telephones adapted for handsfree use
    • H04M1/6075—Portable telephones adapted for handsfree use adapted for handsfree use in a vehicle
    • H04M1/6083—Portable telephones adapted for handsfree use adapted for handsfree use in a vehicle by interfacing with the vehicle audio system
    • H04M1/6091—Portable telephones adapted for handsfree use adapted for handsfree use in a vehicle by interfacing with the vehicle audio system including a wireless interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
    • H04B1/3877—Arrangements for enabling portable transceivers to be used in a fixed position, e.g. cradles or boosters

Definitions

  • the present invention relates to a hands-free device, or more particularly to a wireless hands-free device allowing telephone conversation without wires between the hands-free device and a cellular phone, and the method of controlling audio transmission and reception of the wireless hands-free device by using the same.
  • cellular phones portable wireless terminals
  • problems of automobile accidents occurring while using cellular phones during driving are receiving due attention.
  • companies have developed many types of so-called hands-free devices, which allow a user to carry out telephone conversation without holding it by hand.
  • hands-free devices there are for example a hands-free device for automobile using a curl cable and an automobile cigar jack, an earphone-microphone hands-free device using an earphone jack, and a hands-free device using a transmission method of infrared rays or radio waves.
  • a hands-free device for automobile using a curl cable and a cigar jack there are difficulties in installing a base holder for placing a mobile device, an interface device with a built-in speaker, connected to said base holder by a" curl cable, and a microphone connected to said interface device, i addition, there is an inconvenience in its operation since these devices act as obstructive elements for a driver while operating a gear or other equipment. Such situations are accident-prone.
  • detaching the cellular phone from the base holder there is a further inconvenience of unplugging the curl cable from the cellular phone.
  • a device as shown in Fig. 1 which comprises a base holder with a built-in hands-free circuit, microphone and speaker.
  • Fig. 2 the telephone
  • the objective of the present invention lies in providing a wireless hands-free device, which allows telephone conversation without using a separate connection line to a cellular phone, and in providing a method of controlling audio transmission and reception by using the same.
  • a wireless hands-free device which allows telephone conversation while driving a car by way of securing a cellular phone in place, without a wire between a hands-free device and a cellular phone, comprises a reception part, which senses the magnetic fields generated from a speaker of the cellular phone secured in place upon initiation of a call, converts said magnetic fields to electric signals and then to audible sound recognizable by a user, and outputs said audible sound through a reception speaker of said hands-free device; and a transmission part, which receives the user's voice through a microphone, converts said voice to electric signals, outputs the same through a transmission speaker of the hands- free device, installed near the microphone of the cellular phone, and communicates the user's voice to the microphone of the cellular phone.
  • a wireless hands-free device further comprises a radio frequency (RF) wireless transmission and reception part, which comprises wirelessly receiving the user's voice signals, inputted through a microphone of a radio frequency (RF) hands-free module, which is hanged over the user's ear, and communicating said voice signals to the transmission speaker of the hands-free device; and receiving reception information, converted into electric signals by said reception part and outputted therefrom, which is outputted through a speaker of said radio frequency (RF) hands-free module.
  • RF radio frequency
  • the wireless hands-free device includes said transmission part, which comprises a magnetic-field sensing sensor for transmission, which senses the magnetic fields applied to the speaker of the cellular phone and converts the same into electric signals; an amplifier, which amplifies the signals provided through said magnetic-field sensing sensor for transmission; and a noise removal circuit for removing noise included in the electric voice signals amplified by said amplifier.
  • the wireless hands-free device includes said noise removal circuit, which comprises a circuit having a mode of noise removal by a serial connection of narrow-band notch filters of an analogue mode of different noise removal frequencies; or a circuit having a mode of noise removal by a multiple-band notch filter using a digital signal processing.
  • the wireless hands-free device includes said transmission magnetic-field sensor, which comprises an induction coil of magnetic material, coiled with a copper wire coated with enamel; or a hall-sensor of a semiconductor component, which converts magnetic signals to electric signals.
  • said transmission magnetic-field sensor which comprises an induction coil of magnetic material, coiled with a copper wire coated with enamel; or a hall-sensor of a semiconductor component, which converts magnetic signals to electric signals.
  • Fig. 1 is a drawing of an external appearance, which shows the construction of a hands-free device of prior art.
  • Fig. 2 is a drawing, which shows the connection of a hands-free device of prior art and a cellular phone.
  • Fig. 3 is a drawing, in which a cellular phone is secured into place onto a hands-free device according to the present invention.
  • Fig. 4 is a drawing, which outlines the construction of the inner circuit of a hands-free device according to the present invention.
  • Fig. 3 is a lateral view, which illustrates the connection of a cellular phone to a hands- free device according to the present invention.
  • the signals applied to the speaker 17 of the cellular phone 100 are recognized by way of magnetic field by a magnetic-field sensing sensor 11 on the hands-free device 200. Then, after the noise removal and signal amplification, the signals are outputted through a speaker (not illustrated) built into the hands-free device 200.
  • the user's voice inputted through a microphone (not illustrated) built into the hands-free device 200, is amplified, which is then provided to the microphone 18 of the cellular phone 100 by a transmission speaker (SP3).
  • SP3 transmission speaker
  • the user's voice is then converted into electric signals, which is transmitted to the base station.
  • Fig. 4 is a drawing, which outlines the interior construction of a wireless hands-free device according to a preferable example of the present invention.
  • the wireless hands- free device comprises a reception part 10, which senses the magnetic fields generated from a speaker of the cellular phone secured in place upon initiation of a call, converts said magnetic fields to electric signals and then to audible sound recognizable by a user, and outputs said audible sound through a reception speaker (SP1) of said hands-free device; a transmission part 20, which receives the user's voice through a microphone (M2) of the hands-free device, converts said voice to electric signals, outputs the same through a transmission speaker (SP3) of the hands-free device, installed near the microphone of the cellular phone, and communicates the user's voice to the microphone of the cellular phone; and a radio frequency (RF) wireless transmission and reception part (30A), which comprises wirelessly receiving the user's voice signals, inputted through a microphone (Ml) of a radio frequency (RF) hands-free module (30B
  • the transmission part 10 comprises a magnetic-field sensing sensor 11 for transmission, which senses the magnetic fields applied to the speaker of the cellular phone and converts the same into electric signals; an amplifier 12, which amplifies the signals provided through said magnetic-field sensing sensor 11 for transmission; a noise removal circuit 13 for removing noise included in the electric voice signals amplified by said amplifier 12; a buffer amplifier 14; and another amplifier (AMPl; 15) for sounding the transmission speaker (SP1) of the hands-free device.
  • a magnetic-field sensing sensor 11 for transmission, which senses the magnetic fields applied to the speaker of the cellular phone and converts the same into electric signals
  • an amplifier 12 which amplifies the signals provided through said magnetic-field sensing sensor 11 for transmission
  • a noise removal circuit 13 for removing noise included in the electric voice signals amplified by said amplifier 12
  • a buffer amplifier 14 for buffer amplifier for sounding the transmission speaker (SP1) of the hands-free device.
  • AMPl; 15 another amplifier
  • the present invention uses an induction coil of magnetic material, coiled with a copper wire coated with enamel; or a hall-sensor of a semiconductor component, which converts magnetic signals to electric signals.
  • the present invention uses a method of noise removal by means of a serial connection of narrow-band notch filters of an analogue method of different noise removal frequencies; or a method of noise removal by a multiple band using a digital signal processing (DSP).
  • DSP digital signal processing
  • the transmission part 20 comprises an amplifier (AMP6; 21), which amplifies the sound provided through a microphone (M2) installed on of the hands-free device; another amplifier (AMP5; 22) for sounding the hands-free transmission speaker (SP3) installed near the microphone of the cellular phone.
  • AMP6 amplifier
  • M2 microphone
  • AMP5 amplifier
  • SP3 hands-free transmission speaker
  • the radio frequency (RF) wireless transmission and reception part (30A) is built into the hands-free device for wireless transmission and reception through the radio frequency (RF) wireless hands-free module (30B), which is hanged over the user's ear.
  • the radio frequency (RF) wireless hands-free module (30B) comprises a wireless transmission and reception part 31 for exchanging wireless signals with the wireless transmission and reception part (30A) built into said hands-free device; an amplifier
  • Amp3; 32 for amplifying the signals transmitted to the speaker (SP2); and an amplifier (Amp4; 33) for amplifying the voice signals inputted through the microphone (Ml).
  • a cellular phone emits magnetic-field signals containing voice signal information while simultaneously emitting audio sound.
  • the hands- free device converts the audio reception to electric signals by using a magnetic-field sensing sensor 11 for transmission near the speaker of the cellular phone. Then, it amplifies the signals. In the electric voice signals originating from the other caller, so amplified, include various noise. Some of the cellular phones tend to include excessive noise when combining audio reception by a magnetic means.
  • the hands-free device according to the present invention has a built-in noise removal circuit 13 for removing problematic continuous noise, addition, there is a function for removing other continuous noise generated by products in general, which can be adjusted externally by the user.
  • the voice signals with the noise removed are applied to the speaker (SP1) through an amplifier (Ampl; 15) for sounding the speaker (SP1) of the hands-free device.
  • the modulation signals of the radio frequency (RF) wireless transmission and reception part (30 A) are applied to the input terminal.
  • the radio frequency (RF) wireless hands-free module (30B) which hangs over the user's ear, demodulates the reception signals by using a RF FM MODEM 31, and reproduces and amplifies the caller's voice. Then, the caller's voice is communicated to the user's ear through the speaker (SP2).
  • the voice of the user of the hands-free device can be applied directly to the built-in microphone of the cellular phone.
  • the user's voice which is inputted through the microphone (M2) built into the hands-free device, is converted to electric signals.
  • the input voice signals are amplified by using an amplifier (Amp6; 21) and are outputted through a transmission speaker (SP3) installed near the built-in microphone of the cellular phone.
  • Amp6 amplifier
  • SP3 transmission speaker
  • the voice signals inputted through the microphone (Ml) of the wireless hands-free device hanging over the user's ear, are converted into electric signals and then amplified. Thereafter, the signals are applied to the modulation-signal input terminal of the wireless transmission and reception part 31, followed by frequency modulation, and demodulated by the radio frequency (RF) wireless transmission and reception part (30A). Then, the signals are once again sufficiently amplified by using an amplifier (Amp5; 22), and the user's voice is communicated to the caller at the other end through a transmission speaker (SP3) installed near the built-in microphone of the cellular phone.
  • SP3 transmission speaker
  • the wireless hands-free device according to the present invention as described above has the effect of enabling telephone conversation without directly connecting it to the cellular phone by way of a separate device, such as a curl cable or an earphone.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Telephone Function (AREA)

Abstract

The present invention relates to a wireless hand-free unit and the method of communication via the hand-free unit. The wireless hand-free unit comprises a receiving apparatus transforming a magnetic field into an electrical signal after detecting the magnetic field generated from the speaker of a cellular phone with a telephone call, converting the electrical signal into an audible sounds, and then outputting the audible sounds wich users can recognize through a receiving speaker of a wireless hand-free; and an transmitting apparatus converting user's voice inputted through the microphone into an electrical signal, and then delivering user's voice to a microphone of the cellular phone after outputting user's voice through the receiving speaker on the hand-free set up around the microphone of the cellular phone._It is characteristic that the present invention makes it possible to communicate without connecting the hand-free unit with the cellular phone by wire.

Description

A WIRELESS HAND-FREE UNIT AND THE METHOD OF COMMUNICATION
VIA THE HAND-FREE UNIT
Field of the Invention
The present invention relates to a hands-free device, or more particularly to a wireless hands-free device allowing telephone conversation without wires between the hands-free device and a cellular phone, and the method of controlling audio transmission and reception of the wireless hands-free device by using the same.
Background of the Invention
Currently, portable wireless terminals (hereinafter cellular phones) are in wide distribution. Meanwhile, the problems of automobile accidents occurring while using cellular phones during driving are receiving due attention. In response, companies have developed many types of so-called hands-free devices, which allow a user to carry out telephone conversation without holding it by hand.
As for widely known hands-free devices, there are for example a hands-free device for automobile using a curl cable and an automobile cigar jack, an earphone-microphone hands-free device using an earphone jack, and a hands-free device using a transmission method of infrared rays or radio waves.
As for a hands-free device for automobile using a curl cable and a cigar jack, there are difficulties in installing a base holder for placing a mobile device, an interface device with a built-in speaker, connected to said base holder by a" curl cable, and a microphone connected to said interface device, i addition, there is an inconvenience in its operation since these devices act as obstructive elements for a driver while operating a gear or other equipment. Such situations are accident-prone. Moreover, in detaching the cellular phone from the base holder, there is a further inconvenience of unplugging the curl cable from the cellular phone.
h order to resolve these types of disadvantages, a device as shown in Fig. 1 was proposed, which comprises a base holder with a built-in hands-free circuit, microphone and speaker. However, in using this type of device, as shown in Fig. 2, the telephone
■ conversation is possible only if the cellular phone is connected to the hands-free device through the earphone terminal of the cellular phone. This type of device involves plugging the earphone connection line of the hands-free device to the earphone jack of the cellular phone whenever using the hands-free device. This is very inconvenient and is potentially a cause of earphone jack failures by frequent usage. Moreover, this type of device is still plagued the aforementioned inconvenience since it involves separating the earphone jack when detaching the device from the car.
Summary of the Invention
The objective of the present invention lies in providing a wireless hands-free device, which allows telephone conversation without using a separate connection line to a cellular phone, and in providing a method of controlling audio transmission and reception by using the same.
In order to achieve said objectives, a wireless hands-free device according to Example 1 of the present invention, which allows telephone conversation while driving a car by way of securing a cellular phone in place, without a wire between a hands-free device and a cellular phone, comprises a reception part, which senses the magnetic fields generated from a speaker of the cellular phone secured in place upon initiation of a call, converts said magnetic fields to electric signals and then to audible sound recognizable by a user, and outputs said audible sound through a reception speaker of said hands-free device; and a transmission part, which receives the user's voice through a microphone, converts said voice to electric signals, outputs the same through a transmission speaker of the hands- free device, installed near the microphone of the cellular phone, and communicates the user's voice to the microphone of the cellular phone. A wireless hands-free device according to another example of the present invention further comprises a radio frequency (RF) wireless transmission and reception part, which comprises wirelessly receiving the user's voice signals, inputted through a microphone of a radio frequency (RF) hands-free module, which is hanged over the user's ear, and communicating said voice signals to the transmission speaker of the hands-free device; and receiving reception information, converted into electric signals by said reception part and outputted therefrom, which is outputted through a speaker of said radio frequency (RF) hands-free module.
The wireless hands-free device according to the present invention includes said transmission part, which comprises a magnetic-field sensing sensor for transmission, which senses the magnetic fields applied to the speaker of the cellular phone and converts the same into electric signals; an amplifier, which amplifies the signals provided through said magnetic-field sensing sensor for transmission; and a noise removal circuit for removing noise included in the electric voice signals amplified by said amplifier.
The wireless hands-free device according to the present invention includes said noise removal circuit, which comprises a circuit having a mode of noise removal by a serial connection of narrow-band notch filters of an analogue mode of different noise removal frequencies; or a circuit having a mode of noise removal by a multiple-band notch filter using a digital signal processing.
The wireless hands-free device according to the present invention includes said transmission magnetic-field sensor, which comprises an induction coil of magnetic material, coiled with a copper wire coated with enamel; or a hall-sensor of a semiconductor component, which converts magnetic signals to electric signals.
Brief Description of Drawings
Fig. 1 is a drawing of an external appearance, which shows the construction of a hands-free device of prior art.
Fig. 2 is a drawing, which shows the connection of a hands-free device of prior art and a cellular phone.
Fig. 3 is a drawing, in which a cellular phone is secured into place onto a hands-free device according to the present invention.
Fig. 4 is a drawing, which outlines the construction of the inner circuit of a hands-free device according to the present invention.
Description of the Preferred Embodiments
Below, the construction and the operation of the wireless hands-free device according to the present invention, and the method of controlling audio transmission and reception using said device are described in detail with references to the attached drawings.
Fig. 3 is a lateral view, which illustrates the connection of a cellular phone to a hands- free device according to the present invention. In contrast to the hands-free devices of the prior art, there is no separate connection line between the cellular phone 100 and the hands-free device 200. The signals applied to the speaker 17 of the cellular phone 100 are recognized by way of magnetic field by a magnetic-field sensing sensor 11 on the hands-free device 200. Then, after the noise removal and signal amplification, the signals are outputted through a speaker (not illustrated) built into the hands-free device 200. The user's voice, inputted through a microphone (not illustrated) built into the hands-free device 200, is amplified, which is then provided to the microphone 18 of the cellular phone 100 by a transmission speaker (SP3). The user's voice is then converted into electric signals, which is transmitted to the base station.
Fig. 4 is a drawing, which outlines the interior construction of a wireless hands-free device according to a preferable example of the present invention. The wireless hands- free device comprises a reception part 10, which senses the magnetic fields generated from a speaker of the cellular phone secured in place upon initiation of a call, converts said magnetic fields to electric signals and then to audible sound recognizable by a user, and outputs said audible sound through a reception speaker (SP1) of said hands-free device; a transmission part 20, which receives the user's voice through a microphone (M2) of the hands-free device, converts said voice to electric signals, outputs the same through a transmission speaker (SP3) of the hands-free device, installed near the microphone of the cellular phone, and communicates the user's voice to the microphone of the cellular phone; and a radio frequency (RF) wireless transmission and reception part (30A), which comprises wirelessly receiving the user's voice signals, inputted through a microphone (Ml) of a radio frequency (RF) hands-free module (30B), which is hanged over the user's ear, and communicating said voice signals to the transmission speaker (SP3) of the hands-free device, and receiving reception information, converted into electric signals by said reception part 10 and outputted therefrom, which is outputted through a speaker (SP2) of said radio frequency (RF) hands-free module (30B).
The transmission part 10 comprises a magnetic-field sensing sensor 11 for transmission, which senses the magnetic fields applied to the speaker of the cellular phone and converts the same into electric signals; an amplifier 12, which amplifies the signals provided through said magnetic-field sensing sensor 11 for transmission; a noise removal circuit 13 for removing noise included in the electric voice signals amplified by said amplifier 12; a buffer amplifier 14; and another amplifier (AMPl; 15) for sounding the transmission speaker (SP1) of the hands-free device.
As for the magnetic-field sensing sensor for transmission, the present invention uses an induction coil of magnetic material, coiled with a copper wire coated with enamel; or a hall-sensor of a semiconductor component, which converts magnetic signals to electric signals.
Moreover, as for the method of using the noise removal circuit for removing continuous noise included in the transmission signals sensed at said transmission magnetic-field sensing sensor, the present invention uses a method of noise removal by means of a serial connection of narrow-band notch filters of an analogue method of different noise removal frequencies; or a method of noise removal by a multiple band using a digital signal processing (DSP).
The transmission part 20 comprises an amplifier (AMP6; 21), which amplifies the sound provided through a microphone (M2) installed on of the hands-free device; another amplifier (AMP5; 22) for sounding the hands-free transmission speaker (SP3) installed near the microphone of the cellular phone.
Meanwhile, for private conversation, the radio frequency (RF) wireless transmission and reception part (30A) is built into the hands-free device for wireless transmission and reception through the radio frequency (RF) wireless hands-free module (30B), which is hanged over the user's ear.
The radio frequency (RF) wireless hands-free module (30B) comprises a wireless transmission and reception part 31 for exchanging wireless signals with the wireless transmission and reception part (30A) built into said hands-free device; an amplifier
(Amp3; 32) for amplifying the signals transmitted to the speaker (SP2); and an amplifier (Amp4; 33) for amplifying the voice signals inputted through the microphone (Ml).
Below described is the method of telephone conversation by a wireless hands-free device according to the present invention having the aforementioned construction (i.e., the wireless method of controlling audio transmission and reception). First, the voice reception process using the wireless hands-free device according to the present invention is described as follows:
A cellular phone emits magnetic-field signals containing voice signal information while simultaneously emitting audio sound. For processing audio reception, the hands- free device according to the present invention converts the audio reception to electric signals by using a magnetic-field sensing sensor 11 for transmission near the speaker of the cellular phone. Then, it amplifies the signals. In the electric voice signals originating from the other caller, so amplified, include various noise. Some of the cellular phones tend to include excessive noise when combining audio reception by a magnetic means. For such contingencies, the hands-free device according to the present invention has a built-in noise removal circuit 13 for removing problematic continuous noise, addition, there is a function for removing other continuous noise generated by products in general, which can be adjusted externally by the user. After volume control, the voice signals with the noise removed are applied to the speaker (SP1) through an amplifier (Ampl; 15) for sounding the speaker (SP1) of the hands-free device. Alternatively, for the hands-free device using the radio frequency (RF) signals, the modulation signals of the radio frequency (RF) wireless transmission and reception part (30 A) are applied to the input terminal. The radio frequency (RF) wireless hands-free module (30B), which hangs over the user's ear, demodulates the reception signals by using a RF FM MODEM 31, and reproduces and amplifies the caller's voice. Then, the caller's voice is communicated to the user's ear through the speaker (SP2).
With respect to the wireless hands-free device according to the present invention, as a method of not using an earphone connection, the voice of the user of the hands-free device can be applied directly to the built-in microphone of the cellular phone. The user's voice, which is inputted through the microphone (M2) built into the hands-free device, is converted to electric signals. The input voice signals are amplified by using an amplifier (Amp6; 21) and are outputted through a transmission speaker (SP3) installed near the built-in microphone of the cellular phone. This method brings about the effect as if a user of the hands-free device were talking near the microphone of the cellular phone. Moreover, while using the RF wireless hands-free module (30B) in FM mode, the voice signals, inputted through the microphone (Ml) of the wireless hands-free device hanging over the user's ear, are converted into electric signals and then amplified. Thereafter, the signals are applied to the modulation-signal input terminal of the wireless transmission and reception part 31, followed by frequency modulation, and demodulated by the radio frequency (RF) wireless transmission and reception part (30A). Then, the signals are once again sufficiently amplified by using an amplifier (Amp5; 22), and the user's voice is communicated to the caller at the other end through a transmission speaker (SP3) installed near the built-in microphone of the cellular phone.
With respect to the telephone conversation by way of using a wireless hands-free device according to the present invention as described above, the voice transmission and reception processes are summarized as follows:
(A) In case of not using the FM hands-free module
(1) Voice reception: Speaker 17 of cellular phone → Magnetic-field sensing sensor 11 → Amplifier 12 → Noise removal circuit 13 — Buffer amplifier 14 → Amplifier 15 → Transmission speaker (SP1) built into the hands-free device;
(2) Voice transmission: Microphone (M2) built into the hands-free device →
Amplifier 21 -→ Amplifier 22 → Reception speaker (SP3) built into the hands- free device → Microphone 18 built into the cellular phone;
(B) In case of using the FM hands-free module
(1) Voice reception: Speaker 17 of cellular phone → Magnetic-field sensing sensor 11 → Amplifier 12 → Noise removal circuit 13 → Buffer amplifier 14 → Amplifier 16 → RF wireless transmission and reception part (30 A) → RF FM MODEM 31 → Amplifier 32 → Transmission speaker (SP2) for wireless hands-free module;
(2) Voice transmission: Microphone (Ml) for wireless hands-free module → Amplifier 14 → RF FM MODEM 31 → RF wireless transmission and reception part (30A) → Amplifier 22 → Speaker (SP3) built into the hands- free device -→ Microphone 18 of cellular phone The wireless hands-free device according to the present invention as such uses a wireless method without using an earphone connection line for voice transmission and reception between the cellular phone and the hands-free device.
Industrial Applicability
The wireless hands-free device according to the present invention as described above has the effect of enabling telephone conversation without directly connecting it to the cellular phone by way of a separate device, such as a curl cable or an earphone.

Claims

ClaimsWhat is claimed is:
1. A wireless hands-free device, which allows telephone conversation while driving a car by way of securing a cellular phone in place, without a wire between a hands-free device and a cellular phone, wherein said device comprises a reception part, which senses the magnetic fields generated from a speaker of the cellular phone secured in place upon initiation of a call, converts said magnetic fields to electric signals and then to audible sound recognizable by a user, and outputs said audible sound through a reception speaker of said hands-free device; and a transmission part, which receives the user's voice through a microphone, converts said voice to electric signals, outputs the same through a transmission speaker of the hands-free device, installed near the microphone of the cellular phone, and communicates the user's voice to the microphone of the cellular phone.
2. The wireless hands-free device according to Claim 1, comprising a radio frequency wireless transmission and reception part, which comprises wirelessly receiving the user's voice signals, inputted through a microphone of a radio frequency hands-free module, which is hanged over the user's ear, and communicating said voice signals to the transmission speaker of the hands-free device; and receiving reception information, converted into electric signals by said reception part and outputted therefrom, and outputting the same through a speaker of said radio frequency hands- free module.
3. The wireless hands-free device according to Claim 1 or 2, wherein said reception part comprises a magnetic-field sensing sensor for transmission, which senses the magnetic fields applied to the speaker of the cellular phone and converts the same into electric signals; an amplifier, which amplifies the signals provided through said magnetic-field sensing sensor for transmission; and a noise removal circuit for removing noise included in the electric voice signals amplified by said amplifier.
4. The wireless hands-free device according to Claim 3, wherein said noise removal circuit comprises a circuit having a mode of noise removal by a serial connection of narrow-band notch filters of an analogue mode of different noise removal frequencies.
5. The wireless hands-free device according to Claim 3, wherein said noise removal circuit comprises a circuit having a mode of noise removal by a multiple-band notch filter using a digital signal processing.
6. The wireless hands-free device according to Claim 3, wherein said magnetic-field sensing sensor for transmission comprises an induction coil of magnetic material, coiled with a copper wire coated with enamel.
7. The wireless hands-free device according to Claim 3, wherein said magnetic-field sensing sensor for transmission comprises a hall-sensor of a semiconductor component, which converts magnetic signals to electric signals.
8. A method of controlling audio transmission and reception of a wireless hands-free device, for carrying out telephone conversation without a wire between a hands-free device and a cellular phone secured in place, wherein said method comprises (A) a reception process comprising (A-l) a process of sensing the magnetic fields induced at a speaker of the cellular phone using an induction coil and converting the same to electric signals, and (A-2) a process of amplifying the converted electric voice signals and outputting the same by way of a fransmission speaker of the hands-free device; and (B) a transmission process comprising (B-l) a process of amplifying the user's voice, inputted through a microphone built into the hands-free device, and converting the same to electric signals, and (B-2) a process of outputting the amplified electric signals in the form of audible sound through a transmission speaker of the hands-free device, installed near a microphone of the cellular phone, and communicating the user's voice to the microphone of the cellular phone.
PCT/KR2002/000741 2001-05-10 2002-04-22 A wireless hand-free unit and the method of communication via the hand-free unit WO2002091603A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020010025386 2001-05-10
KR2001/25386 2001-05-10
KR1020020017615A KR20020086224A (en) 2001-05-10 2002-03-30 A wireless handsfree unit and the method of communication via the handsfree unit
KR2002/17615 2002-03-30

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CN113345438A (en) * 2021-05-28 2021-09-03 深圳大学 Monitoring method and system based on loudspeaker magnetic field

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KR200218550Y1 (en) * 2000-11-06 2001-04-02 정종섭 A Hands Free Device For Cellular Phone

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113345438A (en) * 2021-05-28 2021-09-03 深圳大学 Monitoring method and system based on loudspeaker magnetic field

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