ITMI980136A1 - CAR AUDIO SYSTEM FOR MOBILE PHONE - Google Patents

Description

Description of an invention patent entitled:

"CAR AUDIO SYSTEM FOR MOBILE PHONE"

DESCRIPTION

Preliminaries of the invention

Field of the invention

The present invention relates to an automobile audio system and more particularly to an automobile audio system for a cellular telephone for improving the practicality of the cellular telephone and simplifying its structure.

Description of the prior art

A traditional portable wireless cell phone (hereafter referred to as a cell phone) is widely used to enable people to conveniently perform office work in the car or on the road away from the office where they usually work.

However, many problems have emerged as side effects as the mobile phone has become more and more popular. For example, a driver makes a call and converses on a mobile phone with one hand while driving a car with the other hand, thus reducing the driver's concentration while driving and increasing the risk of traffic accidents.

Furthermore, a mobile phone user has a certain tendency to put the mobile phone very close to their ear while talking through the mobile phone, which generates harmful electromagnetic waves, so that the user is exposed to harmful electromagnetic waves which negatively affect the waves of the phone. brain while talking through the mobile phone. Therefore, the problem exists in conventional cell phones that the harmful thermal energy of the electromagnetic waves generated by the cell phone can cause health problems for the user.

A mobile phone that can be used hands-free (hereafter referred to as a mobile phone) has been developed to solve the above problems. A hands-free mobile phone equipment as shown in Figure 1 includes a hands-free unit (2) attached to a side of an automobile body (3) for attaching or detaching the mobile phone (1), an external microphone (4) and a loudspeaker arranged in correspondence with another side of the car body (3), since the microphone (4) and the speaker are electrically connected to the unit for use without hands (2).

The hands-free unit (2) is used to supply power generated by a car battery to the mobile phone (1), to transmit voice signals from the mobile phone (1) to the loudspeaker and to input the voice signals sent through the external microphone (4) to the mobile phone (1). Therefore the driver hears the voice signals with the loudspeaker (5) and chats on the external microphone (4) while driving thus using the mobile phone (1) without having to hold it in his hand.

However, there are problems in traditional hands-free mobile phone equipment due to the fact that the hands-free unit is fixed as a single unit to the car body, thus causing installation difficulty, damage to the car body. an unsightly appearance of the car body due to the hands free unit installed on the car body and inconvenience and inconvenience for the driver and passengers.

In addition, there are additional problems in the hands-free equipment of the cell phone in that an external microphone and speaker are additionally employed, thus making the structure of the cell phone system complicated, damaging the appearance of the vehicle body due to the wiring. electric and causing inconvenience to drivers and passengers.

Summary of the invention

The present invention has been proposed to solve the above problems and an object of the present invention is to provide an automobile audio system for a mobile phone that prevents damage to the car body or deterioration of the appearance of the car due to installation. of an equipment to be used without separate hands.

Another object of the present invention is to employ a loudspeaker already provided at the car audio system for a cellular telephone as well as for a radio or cassette tape and a display element of the cellular telephone to indicate a current operating status of the mobile phone or car audio system, thus simplifying its structure.

To achieve the purposes of the present invention, an automobile audio system for a cellular telephone has been provided having a low frequency amplifier for amplifying and emitting low frequency voice signals tuned and demodulated as a function of the electric waves induced by an antenna and voice signals of low frequency regenerated at the cassette tape and a speaker to output the changed voice signals from the low frequency voice signals into mechanical vibrations after being amplified in the low frequency amplifier, where the system comprises:

an automatic signal selector for selecting and outputting voice signals transmitted from the cellular telephone to the low-frequency amplifier if the cellular telephone is used or for outputting vocal signals transmitted by a demodulator to the low-frequency amplifier if the cellular telephone is not used;

a power supply unit for supplying power from the car battery to the car audio system;

a charging circuit for supplying power from the power supply unit to the mobile phone;

an amplifier for amplifying the vocal signals emitted by the external microphone for transmission to the cellular telephone;

a unit that accommodates the mobile phone arranged at a front side of the car audio system; And

a terminal unit formed at one side of the unit that accommodates the cell phone for electrically connecting the cell phone and the car audio system.

Brief description of the drawings

For a better understanding of the nature and purposes of the invention, please refer to the following detailed description read in relation to the attached drawings in which:

Figure 1 is a schematic representation of a hands-free apparatus of a cellular telephone according to an embodiment of the prior art;

Figure 2 is a schematic representation of an automobile audio system for a mobile phone according to a first embodiment of the present invention;

Figure 3 is a block diagram of an automobile audio system for a mobile phone according to a first embodiment of the present invention;

Figure 4 is a schematic representation of an automobile audio system for a mobile phone according to a second embodiment of the present invention;

Figure 5 is a block diagram of an automobile audio system for a mobile phone according to a second embodiment of the present invention;

Figure 6 is a schematic representation of an automobile audio system for a mobile phone according to a third embodiment of the present invention;

Figure 7 is a block diagram of an automobile audio system for a mobile phone according to a third embodiment of the present invention;

Figure 8 is a perspective view for illustrating an automobile audio system for a cellular telephone according to a fourth embodiment of the present invention;

Figure 9 is a separate perspective view for illustrating an automobile audio system for a cell phone according to a fourth embodiment of the present invention;

Figure 10 is a perspective view of a cell phone shown in Figure 9;

Figure 11 is a block diagram of an automobile audio system for a mobile phone according to a fourth embodiment of the present invention; And

Figure 12 is a block diagram of a mobile phone shown in Figure 11.

Detailed description of the invention

The present invention is described in detail with reference to the attached drawings. Figure 2 is a schematic representation of an automobile audio system for a cell phone according to a first embodiment of the present invention. Figure 3 is a block diagram of an automobile audio system for a mobile phone according to a first embodiment of the present invention.

In the car audio system for a mobile phone according to a first embodiment of the present invention, a first connector (11) formed at the rear side of an automobile audio system (10) and a second connector (31) connected to a mobile phone (30) are electrically connected to the mobile phone and external microphones (41 and 42).

A first external microphone (41) is arranged on one side of a sun visor mounted at the top of the front of the car and a second external microphone (42) is attached to the front of the car's audio system (10).

the car audio system (10) comprises an antenna (12), a tuner (13), an intermediate frequency amplifier (14), a demodulator (15), an automatic signal selector (16), an amplifier with low frequency (17), a loudspeaker (18), a power supply unit (19), a charging circuit (21), a microphone selector (22) and an amplifier (23).

The tuner (13) chooses and transforms a reference frequency out of the electric waves introduced at the antenna (12) into the intermediate frequency to be sent to the intermediate frequency amplifier (14), which amplifies and subsequently transmits the signals of intermediate frequency to the demodulator (15). The demodulator (15) detects only the low frequency voice signals outside the intermediate frequency signals emitted by the amplifier (14) to be sent to the automatic signal selector (16).

The automatic signal selector (16) selects the voice signals emitted by the mobile phone (30) according to the command signal transmitted by the mobile phone (30) through the second connector (31) and the first connector (11) for sending thus to the low frequency amplifier (17) or chooses the low frequency voice signals emitted by the demodulator (15) to send them to the low frequency amplifier (17).

The automatic signal selector (16) chooses the voice signals emitted by the cell phone (30), if the cell phone (30) is used, to send them to the low frequency amplifier (17) and selects the low frequency voice signals emitted from the demodulator (15), if the cellular telephone (30) is not used to send them to the low frequency amplifier (17).

The low frequency amplifier (17) amplifies the signals, emitted them by the automatic signal selector (16) to send them to the loudspeaker (18) which transforms the signals emitted by the low frequency amplifier (17) into mechanical vibrations for thus emit vocal signals.

The power supply unit (19) supplies power from the car's battery (50) to operate the car's audio system (10) and recharge the charging circuit (21) which supplies power from the power supply unit (19) through the first connector (11) and the second connector (31) to the mobile phone (30).

The microphone selector (22) selectively sends the voice signals emitted by the first and second external microphone (41 and 42) depending on the operation of a microphone selection button (25) fixed at the front of the audio system ( 10) of the car. The amplifier (23) amplifies the voice signals emitted through the microphone selector (22) for transmission through the first and second connectors (11 and 31) to the cellular telephone (30).

Figure 4 is a schematic representation of an automobile audio system for a mobile phone according to a second embodiment of the present invention. Figure 5 is a block representation of a mobile phone car audio system according to a second form of the present invention. In Figures 4 and 5 like reference numerals and symbols are used to designate similar or equivalent parts in Figures 2 and 3 for simplicity of illustration and explanation and unnecessary references will be omitted.

In the car audio system for a mobile phone according to a second embodiment of the present invention, a first connector (11) formed at a front side of an automobile audio system (10) and a second connector (31) connected to a mobile phone (30) are electrically connected.

The car audio system (10) comprises an antenna (12), a tuner (13), an intermediate frequency amplifier (14), a demodulator (15), an automatic signal selector * (16), a low frequency amplifier frequency (17), a loudspeaker (18), a power supply unit (19), a charging circuit (21), an amplifier (23) and a signal selection button (26).

The tuner (13) chooses and transforms a reference frequency outside the emission of electric waves at the antenna (12) into the intermediate frequency to be sent to the intermediate frequency amplifier (14), which amplifies and subsequently sends the signals of intermediate frequency to the demodulator (15). The demodulator (15) detects only the low frequency voice signals outside the intermediate frequency signals emitted by the amplifier (14) to be sent to the automatic signal selector (16).

The automatic signal selector (16) chooses the voice signals emitted by the mobile phone (30) according to the activation of the button (26) for selecting the signals to be sent to the low frequency amplifier (17), chooses the voice signals of low frequency emitted by the demodulator (15) to be sent to the low frequency amplifier (17) or simultaneously sends the voice signal of the caller and a low frequency voice signal emitted by the mobile phone (30) and by the demodulator (15) in the amplifier to low frequency (17).

The automatic signal selector (16) chooses the voice signals emitted by the mobile phone (30) by pressing the signal selection button (26), if the mobile phone (30) is in use, to be sent to the low frequency amplifier (17) and chooses the local low frequency signals emitted by the demodulator (15) by pressing the signal selection button (16) if the mobile phone (30) is not in use, to be sent to the low frequency amplifier (17 ). If the user operates the signal selection button (26) to select the caller's voice signal and the low-frequency voice signal from the mobile phone (30) and the demodulator (15) at the same time, the caller's voice signal and the signal low frequency vocals are simultaneously fed into the low frequency amplifier (17).

The low frequency amplifier (17) amplifies the signals emitted by the automatic signal selector (16) to be sent to the loudspeaker (18), which transforms the signals sent by the low frequency amplifier (17) into mechanical vibrations to emit signals vowels.

The power supply unit (19) supplies power from the car's battery (50) to operate the car's audio system (10) and recharge the charging circuit (21) which supplies power from the power supply unit (19) through the first connector (11) and the second connector (31) to the mobile phone (30).

The amplifier (23) amplifies the voice signals emitted by the external microphone (42) installed at the front of the car's audio system (10) in order to send them through the first and second connectors (11 and 31) to the telephone cell phone (30).

Figure 6 is a schematic representation of an automobile audio system for a mobile phone according to a third embodiment of the present invention. Figure 7 is a block diagram of an automobile audio system for a mobile phone according to a third embodiment of the present invention. In Figures 6 and 7 like reference numerals and symbols are used to indicate like or equivalent parts in Figures 2 and 3 for simplicity of illustration and explanation, and unnecessary references will be omitted.

In the car audio system for a mobile phone according to a third embodiment of the present invention, an automobile audio system (10), a hands-free unit (20) arranged at the outer side of the audio system (10) for automobile in its electrical connection and a mobile phone (30) and an external microphone (41) are electrically connected to the unit for use without hands (20). The external microphone (41) is installed at one side of the sun visor disposed near the top of the front side of the car to send the caller's voice signals to the hands-free unit (20).

The hands-free unit (20) transmits the voice signals and control signals from the mobile phone (30) to the car audio system (10). The first and second connectors (27 and 28) are mounted to supply power from the car audio system (10) to the mobile phone (30) by connecting the charging circuit (21), the amplifier (23) and the hands-free unit (20) for car audio system (10) and mobile phone (30).

The first connector (27) is arranged to electrically connect the unit (20) to be used without hands to the external microphone and to the car audio system (10), while the second connector (28) is arranged to electrically connect the unit to be used. use without hands (20) on the mobile phone (30).

The charging circuit (21) is made to feed the current supplied by the car audio system (10) through the first and second connectors (27 and 28) to the mobile phone (30). The amplifier (23) amplifies the vocal signals emitted by the external microphone (41) through the first connector (27) for sending through the second connector (28) to the cell phone (30).

The first and second connectors (27 and 28) are electrically connected so as to send the voice signals and command signals emitted by the cellular telephone (30) to the car audio system (10).

The car audio system (10) comprises an antenna (12), a tuner (13), an intermediate frequency amplifier (14), a demodulator (15), an automatic signal selector (16), a low frequency amplifier (17), a loudspeaker (18) and a power supply unit (19).

The tuner (13) chooses and transforms a reference frequency outside the electric waves emitted at the antenna (12) into the intermediate frequency to be sent to the intermediate frequency amplifier (14), which amplifies and subsequently sends the signals of intermediate frequency to the demodulator (15). The demodulator (15) detects only the low frequency voice signals outside the intermediate frequency signals emitted by the amplifier (14), to be sent to the automatic signal selector (16).

The automatic signal selector (16) chooses the voice signals emitted by the mobile phone (30) according to the command signals emitted by the mobile phone (30) through the second and first collectors (27 and 28) for sending to the low frequency amplifier (17) or chooses the low frequency voice signals emitted by the demodulator (15) to be sent to the low frequency amplifier (17). The automatic signal selector (16) chooses the voice signals emitted by the mobile phone (30) if the mobile phone (30) is in use, for sending to the low frequency amplifier (17) and chooses the low voice signals frequency emitted by the demodulator (15) if the mobile phone (30) is not in use to be sent to the low frequency amplifier (17).

The low frequency amplifier (17) amplifies the signals emitted by the automatic signal selector (16) for sending to the loudspeaker (18), which transforms the signals emitted by the low frequency amplifier (17) into mechanical vibrations for thus emit vocal signals.

The power supply unit (19) supplies power from the car's battery (50) to operate the car's audio system (10) and through the first collector (27) to the charging circuit (21) of the unit to be used without hands (20).

Figure 8 is a perspective view for illustrating an automobile audio system for a cell phone according to a fourth embodiment of the present invention. Figure 9 is a separate perspective view for illustrating an automobile audio system for a cell phone according to a fourth embodiment of the present invention. Figure 10 is a perspective view of a cell phone shown in Figure 9.

In the car audio system for a mobile phone according to a fourth embodiment of the present invention, an car audio system (10) comprises a unit (62) receiving a mobile phone arranged at the front side of the audio system (10) for car for positioning the mobile phone (30) and a terminal unit (70) arranged at one side of the unit (62) that receives the mobile phone to electrically connect the audio system (10) for the car and the phone cellular telephone (30) when the cellular telephone (30) is placed on the unit (62) which receives the cellular telephone.

The antenna (33) of the cellular telephone (30) is hinged to rotate and a unit (35) which receives the antenna is included in correspondence with a part of the rear side of the cellular telephone (30) for positioning the antenna (33) of the mobile phone (30) when it is rotated.

Figure 11 is a block diagram of an automobile audio system for a mobile phone according to a fourth embodiment of the present invention and Figure 12 is a block diagram of a mobile phone shown in Figure 11. Figures 11 and 12 Like reference numerals and symbols are used to designate like or equivalent parts in Figures 2 and 3 for simplicity of illustration and explanation and superfluous references will be omitted.

The car audio system 10 comprises an antenna (12), a tuner (13), an intermediate frequency amplifier (14), a demodulator (15), an automatic signal selector (16), a low frequency amplifier (17 ), a loudspeaker (18), a power supply unit (19), a charging circuit (21), an amplifier (23) and a microcomputer (60).

The tuner (13) chooses and transforms a reference frequency out of electric waves emitted at the antenna (12) into the intermediate frequency to be sent to the intermediate frequency amplifier (14), which subsequently amplifies and sends the signals of intermediate frequency to the demodulator (15). The demodulator (15) detects only the low frequency voice signals outside the intermediate frequency signals emitted by the amplifier (14), to be sent to the automatic signal selector (16).

The microcomputer (60) controls the general operations of the car audio system (10) and of the automatic signal selector (16) according to the command signals emitted by the cellular telephone (30) positioned in correspondence with the receiving unit (62) formed near the front of the car audio system (10) through the terminal unit (70).

If the cellular telephone is used, the cellular telephone (30) sends a command signal to select the caller's voice signals sent from the cellular telephone (30) via the terminal unit (70) to the microprocessor (60). If the cellular telephone (30) is not used, the cellular telephone (30) sends a command signal to select the low frequency voice signals sent by the demodulator (15) through the terminal unit (70) to the microprocessor (60).

The automatic signal selector (16) chooses the voice signals emitted by the mobile phone (30) if the mobile phone is in use, according to the microprocessor command (60) to be sent to the low frequency amplifier (17) or chooses the low frequency voice signals emitted by the demodulator (15) if the telephone is not in use, to be sent to the low frequency amplifier (17). The low frequency amplifier (17) amplifies a signal emitted by the automatic signal selector (16) to be sent to the loudspeaker (18) which transforms the signals sent by the low frequency amplifier (17) into mechanical vibrations to thus emit signals vowels.

The power supply unit (19) supplies power from the car battery (50) to operate the car's audio system (10) and recharge the charging circuit (21) which supplies power from the power supply unit (19) through a terminal unit (70) to the cell phone (30).

The amplifier (23) amplifies the voice signals emitted by the external microphone (41) installed at the front side of the sun visor to be sent through the terminal unit (70) to the cellular telephone (30).

The mobile phone (30) comprises a microcomputer (36), a display element (37) and a drive unit (38) of the display element. The microcomputer (36) electrically connects the mobile phone (30) and the car audio system (10) via the terminal unit (70) when the mobile phone (30) is positioned at the receiving unit (62) of the car. mobile phone.

The microcomputer (36) detects when the cell phone (30) is positioned at the cell phone receiving unit (62) to transmit a command signal for displaying cell phone data to the cell phone drive unit (38). display element and a mobile phone display data to indicate the current state of the mobile phone (30).

11 microcomputer (36) sends a command signal to display data from the car audio system to the drive unit (38) of the display element if the mobile phone (30) is disconnected from the car audio system (10) .

The drive unit (38) of the display element sends mobile phone display data outputted from the microprocessor (36) to the display element (37) if the control signal related thereto and the display data of the display element are sent. car audio system from the microprocessor (36) to the display element (37) if the control signal related thereto is output.

The display element (37) consists of a liquid crystal display element (LCD) for displaying the mobile phone display data or the car audio system display data output from the drive unit (38). display element.

The operating procedures and operating effects of the car audio system for a mobile phone are described in detail below. As described in a first embodiment of the present invention, the tuner (13) chooses and transforms a reference frequency out of electric waves input at the antenna (12) into the intermediate frequency to be sent to the intermediate frequency amplifier (14), which subsequently amplifies and sends the intermediate frequency signals to the demodulator (15). The demodulator (15) detects only the low frequency voice signals outside the intermediate frequency signals emitted by the amplifier (14) to be sent to the automatic signal selector (16).

The automatic signal selector (16) chooses the voice signals emitted by the mobile phone (30) according to the command signal transmitted by the mobile phone (30) through the second connector (31) and the first connector (11), to be sent to the 'low frequency amplifier (17) or chooses the low frequency voice signals emitted by the demodulator (15), to be sent to the low frequency amplifier (17).

If the mobile phone (30) is in use, the command signal to choose the caller's voice signals emitted by the mobile phone (30) is entered through the second and first connectors (31 and 11) in the automatic signal selector (16 ). Then the automatic signal selector (16) sends the voice signals of the caller emitted by the cellular telephone (30) to the low frequency amplifier (17) according to the command signal sent by the cellular telephone (30).

If the mobile phone (30) is not used, the command signal for selecting the low frequency voice signals emitted by the demodulator (15) is sent through the second and first connectors (31 and 11) to the automatic signal selector (16 ). Then the automatic signal selector (16) sends the low frequency voice signals emitted by the cell phone (30) to the low frequency amplifier (17) according to the command signal sent by the cell phone (30).

Furthermore, the low frequency amplifier (17) amplifies the vocal signals emitted by the automatic signal selector (16), to be sent to the loudspeaker (18), which transforms the vocal signals sent by the low frequency amplifier (17) into vibrations. mechanical to emit the vocal signals.

Therefore the voice signals of the caller emitted by the cellular telephone (30) are regenerated at the loudspeaker (18) if the cellular telephone is in use. On the other hand, the low frequency voice signals emitted by the demodulator (15) are regenerated at the loudspeaker (18) to be heard on a radio or cassette tape if the cell phone (30) is not in use.

If a caller chooses a first external microphone (41) arranged in correspondence with the sun visor with activation of the microphone selection button (25) installed at the front of the audio system (10) for the car, the selector (22) of the microphone sends the vocal signals emitted by the first external microphone (41) to the amplifier (23). If a caller chooses a second external microphone (42) located at the front of the car audio system (10) by pressing the microphone selection button (25), the microphone selector (22) sends the voice signals output from the second external microphone (42) to the amplifier (23).

The amplifier (23) amplifies the voice signals emitted through the microphone selector (22) to transmit them through the first and second connectors (11 and 31) to the mobile phone (30), which sends the voice signals sent through the amplifier (23) of the car audio system (10) to a telephone base station, with which calls can be made.

The power supply unit (19) supplies power from the car battery (50) to operate the car audio system (10) and recharge the charging circuit (21) which supplies power from the power supply unit ( 19) through the first connector (11) and the second connector (31) to the mobile phone (30).

As described in the second embodiment of the present invention, the tuner (16) selects and transforms a reference frequency out of electric waves fed into the antenna (12) into the intermediate frequency to be sent to the intermediate frequency amplifier ( 14) which subsequently amplifies and sends the intermediate frequency signals to the demodulator (15). The demodulator (15) detects only the low frequency voice signals outside the intermediate frequency signals emitted by the amplifier (14) to be sent to the automatic signal selector (16).

the automatic signal selector (16) chooses the voice signals emitted by the mobile phone (30) according to the operation of the button (26) for selecting the signals to be sent to the low frequency amplifier (17), chooses the voice signals of low frequency emitted by the demodulator (15) to be sent to the low frequency amplifier (17) or simultaneously chooses the voice signal of the person calling and the low frequency voice signals coming from the mobile phone (30) and from the demodulator (15) to be sent to the 'low frequency amplifier (17).

In other words, if the caller operates the signal selection button (26) to send the command signal to choose the caller's voice signals emitted by the mobile phone (30) to the automatic signal selector (16), the automatic signal selector (16) selects the voice signals emitted by the cellular telephone (30) through the first and second connectors (31 and 11), to be sent to the low frequency amplifier (17).

If the caller activates the signal selection button (26) to send a command signal to simultaneously choose the calling person's voice signal and the voice signals emitted by the mobile phone (30) and the demodulator (15) to be sent to the selector automatic signal selector (16), the automatic signal selector (16) chooses the voice signal of the caller and the low frequency voice signals emitted by the mobile phone (30) and the demodulator (15), to be sent to the low frequency amplifier (17).

The low frequency amplifier (17) amplifies a signal emitted by the automatic signal selector (16) to be sent to the loudspeaker (18), which transforms the signal emitted by the low frequency amplifier (17) into mechanical vibrations to thus emit voice cues.

The caller's voice signals emitted by the mobile phone (30) are regenerated at the loudspeaker (18) if the mobile phone is in use. On the other hand, the low frequency voice signals emitted by the demodulator (15) are regenerated at the loudspeaker (18) for listening to a radio or cassette tape if the mobile phone (30) is not in use.

Then the caller's voice is sent through the external microphone (42) arranged at the front side of the car audio system (10) to the amplifier (23). The amplifier (23) amplifies the voice signals emitted through the signal selector (22) for transmission through the first and second connectors (11 and 31) to the mobile phone (30), which sends the voice signals entered through the amplifier (23) of the car audio system (10) to a telephone base station with which calls can be made.

The power supply unit (19) supplies power from the car's battery (50) to operate the car's audio system (10) and recharge the charging circuit (21) which supplies power from the power supply unit (19) through the first connector (11) and the second connector (31) to the mobile phone (30).

As described in the third embodiment of the present invention, the tuning (13) chooses and transforms a reference frequency out of the electric waves emitted at the antenna (12) into the intermediate frequency to be sent to the intermediate frequency amplifier (14), which subsequently amplifies and sends the intermediate frequency signals to the demodulator (15). The demodulator (15) detects only the low frequency voice signals outside the intermediate frequency signals emitted by the amplifier (14) to be sent to the automatic signal selector (16).

The automatic signal selector (16) chooses the voice signals of the calling person emitted by the mobile phone (30) according to the command signals emitted by the mobile phone (30) through the first and second connectors (28 and 27), to be sent to the low frequency amplifier (17) or choose the low frequency voice signals emitted by the demodulator (15) to be sent to the low frequency amplifier (17).

If the mobile phone is not in use, the command signal for choosing the caller's voice signals emitted by the mobile phone (30) is sent through the first and second connectors (28 and 27) to the automatic selector (16) of signals, which chooses the voice signals of the person calling to be sent to the low frequency amplifier (17) according to the command signal emitted by the mobile phone (30).

If the mobile phone is not in use, the command signal for choosing the voice signals emitted by the demodulator (15) is sent through the first and second connectors (28 and 27) to the automatic signal selector (16), which selects the low frequency voice signals emitted by the demodulator (15) to be sent to the low frequency amplifier (17).

The low frequency amplifier (17) amplifies a signal emitted by the automatic signal selector (16) to be sent to the loudspeaker (18), which transforms the signals sent by the low frequency amplifier (17) into mechanical vibrations to emit signals vowels.

The caller's voice signals emitted by the mobile phone (30) are regenerated at the loudspeaker (18) if the mobile phone is in use. On the other hand, the low frequency voice signals emitted by the demodulator (15) are regenerated at the loudspeaker (18) for listening via radio or on cassette tape if the cellular telephone (30) is not in use.

Then the voice of the caller is fed through the external microphone (41) into the amplifier (23) of the unit to be used without hands (20). The amplifier (23) amplifies the voice signals emitted by the external microphone (41) to transmit them through the second connector (28) to the mobile phone (30) which sends the voice signals passed through the amplifier (23) of the unit to be used. hands-free (20) to a telephone base station for which calls can be made.

The power supply unit (19) supplies power from the car battery (50) to operate the car audio system (10) and recharge the charging circuit (21) of the hands-free unit (20) through the first connector (27). The recharging circuit (21) of the hands-free unit (20) sends the current supplied by the power supply unit (19) through the first connector (27) to the mobile phone (30) through the second connector (28).

As described in the fourth embodiment of the present invention, the tuner (13) chooses and transforms a reference frequency out of the electric waves emitted at the antenna (12) into the intermediate frequency to be sent to the intermediate frequency amplifier ( 14), which subsequently amplifies and sends the intermediate frequency signals to the demodulator (15). The demodulator (15) detects only the low frequency voice signals outside the intermediate frequency signals emitted by the amplifier (14) to be sent to the automatic signal selector (16).

If the cell phone (30) is not in use, the cell phone (30) sends a command signal to select the low frequency voice signals emitted by the demodulator (15) through the terminal unit (70) to the microcomputer (60) , which controls the automatic signal selector (16) according to the command signal emitted by the cellular telephone (30) to select and send the low frequency voice signals emitted by the demodulator (15).

If the cellular telephone (30) is in use, the cellular telephone (30) sends a command signal to select the caller's voice signals emitted by the cellular telephone (30) through the terminal unit (70) to the microcomputer (60 ) of the car audio system, which controls the automatic signal selector (16) according to the command signal emitted by the cellular telephone (30) to select and emit the voice signals emitted by the cellular telephone (30).

The automatic signal selector (16) chooses the voice signals of the caller emitted by the mobile phone (30) according to the control signal of the microcomputer (60) to be sent to the low frequency amplifier (17) or chooses the voice signals frequency emitted by the demodulator (15) to be sent to the low frequency amplifier (17).

The low frequency amplifier (17) amplifies a signal emitted by the automatic signal selector (16) to be sent to the loudspeaker (18), which transforms the signals sent by the low frequency amplifier (17) into mechanical vibrations to emit thus voice cues.

The caller's voice signals emitted by the mobile phone (30) are regenerated at the loudspeaker (18) if the mobile phone is in use. On the other hand, the low frequency voice signals emitted by the demodulator (15) are regenerated at the loudspeaker (18) for listening via radio or on cassette tape if the cellular telephone (30) is not in use.

Then the caller's voice emitted through the external microphone (41) is amplified for transmission through the terminal unit (70) to the mobile phone (30), which sends the voice signals emitted through the amplifier (23) of the system car audio (10) to a telephone base station, through which calls can be made.

The power supply unit (19) supplies power from the car battery (50) to operate the car audio system (10) and recharge the charging circuit (21) which supplies power from the unit (19) of the car. power supply via the terminal unit (70) to the mobile phone (30).

On the other hand, the microcomputer (36) of the cell phone (30) detects when the cell phone (30) is disconnected from the cell phone receiving unit (62), the cell phone (30) and the audio system (10) for car being electrically disconnected from the terminal unit (70) and sends a command signal to display the cell phone display data and a cell phone display data to indicate the current state of the cell phone (30) to the unit (38 ) for actuating the display element.

If the mobile phone (30) is placed at the mobile phone receiving unit (62) of the car audio system (10) so that the mobile phone (30) and the car audio system (10) electrically connected by the terminal unit (70), the microprocessor (36) sends a command signal for displaying the display data of the car audio system to the display element drive unit (38).

The display element drive unit (38) sends a mobile phone display data output from the microprocessor (36) to the display element (37) if the command signal related thereto and a display data are output of the car audio system from the microprocessor (36) to the display element (37) if the control signal related thereto is output.

The cell phone antenna (33) (30) is pivoted to rotate and an antenna receiving unit (35) is included at the rear of the cell phone (30) to accommodate the antenna (33 ) of the mobile phone (30) when it is rotated. Therefore it is possible to rotate and pull out the antenna (33), if necessary, or arrange the antenna (33) in correspondence with the receiving unit (35).

As will be understood from the foregoing description, there are advantages in the car audio system for cellular phones in that an apparatus for use without hands is not installed separately, thus preventing damage to the vehicle bodywork or deterioration of the appearance of the bodywork.

Furthermore, there are further advantages in the car audio system for mobile phone in that a loudspeaker already provided in the car audio system is used with the dual function for radio or cassette tape and for a mobile phone and the telephone display element cell phone is commonly used to simplify the structure of the cell phone system.

Claims (8)

CLAIMS 1. Car audio system for a cellular telephone having a low frequency amplifier for amplifying and outputting tuned and demodulated low frequency voice signals as a function of antenna induced electrical waves and regenerated low frequency voice signals at the cassette tape and a loudspeaker for sending the voice signals changed from low frequency voice signals into mechanical vibrations after they have been amplified at the low frequency amplifier, a system comprising: an automatic signal selector to choose and send voice signals transmitted from the mobile phone to the low frequency amplifier if the mobile phone is in use or to output voice signals transmitted from a demodulator to the low frequency amplifier if the mobile phone is not in use use; a power supply unit for supplying power from the car battery to the car audio system; a charging circuit for supplying power from the power supply unit to the mobile phone; And an amplifier to amplify the voice signals emitted by the external microphone to be sent to the mobile phone. System according to claim 1, wherein the external microphone comprises: a first microphone arranged at one side of a sun visor; a second microphone attached to a front face of an automobile audio system; a microphone select button mounted at the front of an automobile audio system; And a microphone selector which selectively transmits the vocal signals emitted by the first and second external microphones to the amplifier according to the activation of the microphone selection button. System according to claim 1, wherein the automatic signal selector selects the caller's voice signals or the low frequency voice signals emitted by the mobile phone for sending to the low frequency amplifier when a selection button is operated signals fixed to a front of the car audio system or selects the caller's voice signals and low frequency voice signals to be transmitted simultaneously to the low frequency amplifier. The system according to claim 1, wherein the mobile phone is electrically connected to the car audio system via a connector disposed at a front side of the car audio system. The system according to claim 1, wherein the amplifier and the charging circuit are incorporated at the hands-free unit on an external part of the car audio system and the hands-free unit electrically connects the mobile phone and the car audio system. The system according to claim 1, wherein a cellular telephone receiving unit is arranged at a front side of the car audio system and a terminal unit is formed at one side of the cellular telephone receiving unit for connecting electrically the cellular phone and the car audio system if the cellular phone is placed at the cell phone's receiving unit. A system according to claim 6, wherein a cellular telephone antenna is rotated and an antenna receiving unit is disposed where the antenna is rotated and positioned. System according to claim 6 or 7, wherein the mobile phone comprises: a microprocessor for controlling the general operations of the mobile phone and for sending a display data of the mobile phone to demonstrate a current state of the mobile phone and for sending a command signal after determining whether the mobile phone and, the audio system for cars are electrically connected when the mobile phone is placed at the mobile phone reception unit; a display element for showing a mobile phone display data or an automobile audio system display data output from the automobile audio system; And a display element drive unit for operating the display element to show the display data of the car audio system if the control signal showing the electrical connection between the mobile phone and the car audio system is output from the microprocessor or to show the cell phone display data if the command signal showing the electrical disconnection between the cell phone and the car audio system is output from the microprocessor.