KR20040006850A - Circuit for processing voice of audio system having handsfree function and method thereof - Google Patents

Abstract

The present invention relates to a voice processing circuit and a method of an in-vehicle audio system having a hands-free function. The present invention relates to a microcomputer for controlling operations of an audio device and a driver mobile communication terminal, a mobile communication terminal, an incoming / outgoing call signal, a voice signal of a driver and the other party. Bluetooth module for transmitting / receiving, a key input unit for outputting a "hook on" signal to the microcomputer by operating a key when an incoming / outgoing signal is generated to the mobile communication terminal, and a microphone for inputting a driver's voice signal when the mobile communication terminal is "hook on" If the radio is selected from among audio devices, the tuner tunes the broadcast tuner to receive the radio signal of the corresponding frequency and the analog signal received from the audio device while the mobile communication terminal is "hooked off". Audio signal from an audio device that has been digitally A conversion unit for converting an analog signal and converting the driver's voice signal into a digital signal while converting the driver's voice signal into a digital signal while muting the audio signal of the audio device when the mobile communication terminal is in the "hook on" state; A digital processing unit for equalizing a signal converted into a digital signal from a converter, a CD player signal, or an opponent's voice signal by software to output a driver's voice signal to the Bluetooth module and to output the remaining signals to the converter; It includes an amplifier for amplifying the analog signal and output to the speaker.

Description

Circuit for processing voice of audio system having handsfree function and method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speech processing circuit and a method of a car audio system having a hands-free function. More particularly, the present invention relates to a vehicle audio system having a hands-free function which can be used as a wireless hands-free while improving the reproducibility of speech by processing a voice signal in a digitalized state. The present invention relates to a speech processing circuit and a method.

In general, an audio system such as a radio, a cassette tape recorder, or a CD player (Compact Disk player) is installed in a vehicle to listen to various information or music transmitted from a broadcasting station for the convenience and comfortable driving conditions of the driver and passenger. . In a vehicle audio system, when a voice signal contains noise such as high frequency or various errors occur, sound quality output through a speaker is degraded. Therefore, the sound quality is improved by removing noise such as a high frequency or correcting and interpolating various errors in processing a voice signal.

According to the model, the vehicle has an internal structure, that is, a size of an internal space, an internal decoration made of an acoustic reflector and an absorber, as well as a location and number of speakers, which are different from each other. Therefore, after the audio system is mounted on the vehicle, the tuning is performed for each model and the sound quality is improved.

In addition, mobile communication terminals that can easily communicate with each other regardless of time and place using a wireless call signal of a predetermined band have become popular. If a mobile communication terminal is to be used while driving a vehicle, the driver is driving with one hand while holding the mobile communication terminal with one hand and talking, and thus the concentration of forward attention or surrounding situation is degraded, causing a traffic accident.

Therefore, the driver is prohibited from talking on the mobile communication terminal in his hand while driving the vehicle, whereby it is common to talk through hands-free mounted at a predetermined position inside the vehicle. In the above, the hands-free is mounted at a predetermined position in the vehicle, for example, a front panel, and is used while the hands-free is equipped with a mobile communication terminal.

However, when a separate hands-free is mounted on a vehicle as in the related art, costs are not only generated, but space utilization inside the vehicle is lowered, and there is a problem of injuring a driver when an accident occurs. In addition, since the driver has to take the mobile communication terminal hands-free when boarding the vehicle, there is a troublesome use and inconvenience.

Accordingly, it is an object of the present invention to provide a voice processing circuit of an in-vehicle audio system having a hands-free function in which a separate hands-free is not mounted on a vehicle to prevent the occurrence of costs.

Another object of the present invention is to provide a voice processing circuit of a vehicle audio system having a hands-free function that can improve the space utilization inside the vehicle by not mounting the hands-free to the vehicle and reduce the injury of the driver in the event of an accident.

Another object of the present invention is to provide a voice processing method of an in-vehicle audio system having a hands-free function which can be wirelessly transmitted to a mobile communication terminal.

A voice processing circuit of a vehicle audio system having a hands-free function according to the present invention for achieving the above objects includes a radio device, a cassette tape recorder, and a CD player, a built-in audio device and a Bluetooth element, and a driver moving in wireless communication with a counterpart mobile communication terminal. A microcomputer for controlling the operation of the communication terminal, a Bluetooth module for digitally transmitting / receiving an incoming / outgoing signal to / from the mobile communication terminal, voice signals of the driver and the other party, and the operation of a key when the incoming / outgoing signal is generated to the mobile communication terminal. a key input unit for outputting a "hook on" signal to the microcomputer, a microphone to which the voice signal of the driver is input while the mobile communication terminal is hooked on, and broadcasted when the operation of the radio is selected. Tuning signal is input through the microcomputer to tune the broadcast A tuner for receiving a number of radio signals, and a radio signal or tape signal that is converted into a digital signal by converting a radio signal or a tape signal received from a tuner or a cassette tape recorder in a "hook off" state into a digital signal. Or converts a signal of a CD player into an analog signal, and converts the driver's voice signal into a digital signal and mutes the voice signal of the audio device when the mobile communication terminal is " hook on " Equalizing unit converts the signal into an analog signal, and software which is programmed for the optimum tuning conditions different from the signal converted to the digital signal from the converter, the signal of the CD player or the other party's audio signal according to the model of the vehicle The driver voice signal To output to the Bluetooth module group, and the digital processing unit and outputting the remaining signal to conversion, it amplifies the analog signal converted by the conversion unit includes amplification section for output to the speaker.

According to another aspect of the present invention, there is provided a voice processing method of an in-vehicle audio system having a hands-free function, comprising: a first step of determining whether a driver's mobile communication terminal is in a "hook on" state or feeding back an initial state; A second step in which the mobile communication terminal keeps the "on" state when one of the audio devices is "on" in the "hook on" state and mutes the voice while automatically "on" when the "off" state; A third step of determining whether the other party's voice signal is input to the Bluetooth module through a communication terminal; a fourth step of digitally equalizing the digital signal by the digital processing unit when the other party's voice signal is input; and converting the equalized party's voice signal into an analog signal. Converting and amplifying the signal into a voice and outputting the voice through the speaker; A fifth step of inputting a driver voice signal through a microphone if the room voice signal is not input, a sixth step of converting the driver voice signal into a digital signal and equalizing the software signal; and converting the driver voice signal into the Bluetooth module. A seventh step of wirelessly transmitting to the mobile communication terminal through.

1 is a voice processing circuit diagram of a vehicle audio system having a hands-free function according to the present invention.

2 is a flowchart illustrating a voice processing method of an in-vehicle audio system during hands-free operation according to the present invention.

Explanation of symbols on the main parts of the drawings

11: Audio device 13: Microcomputer

15: tuner section 17: conversion section

19: digital processing unit 21: amplifying unit

23 speaker 25 Bluetooth module

27: key input unit 29: mobile communication terminal

31: microphone

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a voice processing circuit diagram of an in-vehicle audio system having a hands-free function according to the present invention.

The audio processing circuit of a vehicle audio system having a hands-free function according to the present invention includes an audio device 11, a microcomputer 13, a tuner unit 15, a converter unit 17, a digital processor unit 19, and an amplifier unit 21. , A speaker 23, a Bluetooth module 25, a key input unit 27, and a microphone 31.

The audio device 11 is composed of a radio, a cassette tape recorder, a CD player, and the like, one of which is selected by operation of a key to be "on / off" and outputs a control signal to the microcomputer 13. do. In addition, when the radio is selected from the audio device 11 in the " on " state, the broadcast tuning signal is selected, and the signal controlling the operation mode when the cassette tape recorder or the CD player is selected " on " 13).

The tuner unit 15 receives a radio signal of a corresponding frequency by tuning the broadcast to be listened by the broadcast channel selection signal is input through the microcomputer 13, the digital processing unit 19 and the conversion unit 17.

The conversion unit 17 includes an A / D (Analog / Digital) converter and a D / A (Digital / Analog) converter. The conversion unit 17 converts a radio signal or a cassette tape signal received in an analog state into a digital signal, and converts a signal processed in the digital state into an analog signal. In addition, the conversion unit 17 converts the driver's voice signal input through the microphone 31 into a digital signal during hands-free operation, and converts the other party's voice signal input from the digital processing unit 19 into an analog signal.

The Bluetooth module 25 transmits / receives incoming / outgoing signals, voice signals of the driver and the counterpart with the mobile communication terminal 29 of a driver in which a separate Bluetooth device (not shown) is built. The Bluetooth module 25 digitally transmits / receives an incoming / outgoing signal, a voice signal of a driver and a counterpart with the mobile communication terminal 29.

If the audio device 11 is operating during the hands-free operation, the Bluetooth module 25 controls the operation of the converter 17 through the microcomputer 13 to suspend the function of the audio device 11 and the microphone 31. To convert the driver's voice signal input through) and the other party's voice signal input from the digital processing unit 19.

The key input unit 27 inputs a "hook on" or "hook off" signal to the microcomputer 13 by operating the key, and the microcomputer 25. By the control of the Bluetooth module 25 and the mobile communication terminal 29 to wirelessly connect or block. In the above, when the incoming signal is transmitted from the other party's mobile communication terminal (not shown) to the mobile communication terminal 29, or when the outgoing signal is transmitted from the mobile communication terminal 29 to the other party's mobile communication terminal, a key input unit. The mobile communication terminal 29 is "hooked on" by manipulation of the key (27).

The digital processing unit 19 adds and subtracts the digital signal or the digital signal output when the CD player is selected by the conversion unit 17 to reinforce the high and low sound, and to filter out the high frequency to remove noise to remove the noise. Equalize to be similar. In the above-described digital processing unit 19, tuning conditions are programmed to equalize to an optimal state so that echoes and echoes are not generated depending on the vehicle. In addition, the digital processing unit 19 "hooks" the mobile communication terminal 29 and hands-free operation when the driver voice signal converted into a digital signal by the conversion unit 17 through the Bluetooth module 25 Equalizes the other party's voice signal.

According to the model, the tuning conditions are different due to the size of the interior space, the interior decoration material consisting of the acoustic reflector and the sound absorber, the position and the number of speakers are different. Therefore, the digital processing unit 19 is programmed with different optimum tuning conditions depending on the type of vehicle. Therefore, the digital processing unit 19 completely improves the equalizing function by completely removing high frequency noise from the digital signal and reinforcing high and low sound by software, and programming the tuning conditions, thereby making it compatible with different types of vehicles. In addition, since the digital processing unit 19 processes the digital audio signal stored in the digital state without converting the digital voice signal into an analog signal, noise due to signal conversion is not generated, so that the sound quality can be prevented from being degraded.

The remaining signals other than the driver's voice signal equalized by the digital processor 19, that is, the radio signal, the cassette tape signal, the CD signal, and the other party's voice signal, are converted from the digital to the analog by the converter 17.

The amplifier 21 amplifies the analog signal converted by the converter 17, the speaker 23 outputs the amplified signal as a voice. The driver voice signal equalized by the digital processor 19 is transmitted to the counterpart mobile communication terminal through the Bluetooth module 25 and the user mobile communication terminal 29.

The hands-free function of the driver mobile communication terminal 25 in which the Bluetooth element is embedded is performed by the Bluetooth module 25 embedded in the audio system, without installing a separate hands-free inside the vehicle. In addition to preventing accidents, hands-free installation inside the vehicle can improve space utilization and reduce driver injuries due to collisions with hands-free in the event of an accident.

The operation of the audio processing circuit of the vehicle audio system having the above-described configuration will be described.

When any one of a radio, a cassette tape recorder and a CD player constituting the audio device 11 is selected by the operation of the key, the microcomputer 13 recognizes the signal to select and "on" the selected one.

When the radio of the audio device 11 is selected to operate, the microcomputer 13 selects the radio and turns it on. When the signal for tuning the broadcast to be listened to by the radio is output, the microcomputer 13 outputs the tuning signal to the digital processing unit 19. The tuning signal is input from the digital processing unit 19 to the tuner unit 15 through the conversion unit 17 to tune the broadcast, whereby the tuner unit 15 receives a radio signal of a corresponding frequency.

The tuner unit 15 outputs the received radio signal to the conversion unit 17, and the conversion unit 17 converts the input radio signal into a digital signal and outputs the digital signal to the digital processing unit 19. The digital processing unit 19 adds and subtracts from the transmitted signal to the digital signal, reinforces and filters the high and low tones, removes the noise, and equalizes the actual sound quality.

In the above, the digital processing unit 19 is tuned and programmed to equalize to an optimal state according to the vehicle. That is, the digital processing unit 19 is programmed so that echo sound and echo are not generated regardless of the size of the vehicle interior space, the interior decoration material consisting of the sound reflector and the sound absorber, and the position and number of the speakers. Therefore, the digital processing unit 19 can completely remove the high frequency noise from the digital signal in software and reinforce the high and low sounds, thereby improving the equalizing function. In addition, since the digital processing unit 19 tunes in software, a separate circuit is not required and is compatible with vehicles of different models.

The digital processing unit 19 outputs the processed signal to the conversion unit 17, and the conversion unit 17 converts the input signal into an analog signal and outputs it to the amplifying unit 21. The amplifier 21 amplifies the input signal to output the voice of the radio through the speaker (23).

If the cassette tape recorder of the audio device 11 is selected to operate, the microcomputer 13 selects and plays the cassette tape recorder. Accordingly, the cassette tape recorder outputs the audio signal stored in the tape to the conversion unit 17, and the conversion unit 17 converts the input audio signal into a digital signal and outputs it to the digital processing unit 19. At this time, the microcomputer 13 controls the converter 17 through the digital processor 19 to prevent the received radio signal from being converted into a digital signal.

Therefore, the digital processing unit 19 equalizes the digital signal and outputs it to the conversion unit 17. The conversion unit 17 converts the input signal into an analog signal and transmits it to the amplifying unit 21. The amplifier 21 amplifies the transmitted signal and outputs the voice stored in the tape through the speaker 23.

In addition, when the CD player of the audio device 11 is selected to be operated, the microcomputer 13 selects and plays the CD player of the audio device 11. Accordingly, the CD player outputs the audio signal stored as the digital signal on the CD to the digital processing unit 19. At this time, the microcomputer 13 controls the converter 17 through the digital processor 19 to prevent the received radio signal from being converted into a digital signal.

Therefore, the digital processing unit 19 equalizes the digital signal of the input CD and outputs it to the conversion unit 17. The conversion unit 17 converts the input signal into an analog signal and transmits it to the amplifying unit 21. The amplifier 21 amplifies the transmitted signal and outputs the voice stored in the tape through the speaker 23.

2 is a flowchart illustrating a voice processing method of an in-vehicle audio system during hands-free operation according to the present invention.

A voice processing method of a vehicle audio system during hands-free operation according to the present invention will be described with reference to FIG. 1.

Referring to step 1 (S1), it is determined whether the driver's mobile communication terminal 29 is in the "hook on" state. In the above, the mobile communication terminal 29 outputs a signal from the key input unit 27 to the microcomputer 13 when the driver operates a key when an incoming or outgoing signal is generated between the mobile communication terminal and the other party. Accordingly, the microcomputer 13 determines that the mobile communication terminal 29 is in the "hook on" state. If it is determined that the mobile communication terminal 29 is not in the "hook on" state, it is fed back to the initial state.

Referring to step 2 (S2), if the mobile communication terminal 29 is determined to be in the "hook on" state, the audio device 11, that is, any one of the radio, the cassette tape recorder and the CD player is in operation, i.e. To determine if it is in the "on" state.

Referring to step 3 (S3), if it is determined that the audio device 11 is in operation, the function is suspended. That is, when it is determined whether one of the radio, the cassette tape recorder, and the CD player is in operation, the input audio signal is not converted from digital to analog or analog to digital while maintaining the operation state, that is, "on" state. To mute the voice.

Referring to step 4 (S4), if it is determined in step 2 (S2) that the audio device 11 is in the "off" state, the microcomputer 13 automatically turns on any one of the audio devices 11, for example, a radio. "On" mutes the voice.

Referring to step 5 (S5), it is determined whether the other party's voice signal is input. The audio device 11 determines, for example, whether the other party's voice signal is input to the Bluetooth module 25 through the mobile communication terminal 29 when the radio is muted and the voice remains on. do. At this time, the other party's voice signal is digitally input.

Referring to step 6 (S6), if the other party's voice signal is input, the digital processing unit 19 equalizes the other party's voice signal. Since the other party's voice signal is equalized by software, high frequency noise is completely eliminated, and the voice signal is added and subtracted to reinforce the high and low sounds.

Referring to step 7 (S7), the equalized counterpart voice signal is converted by the converter 17 into an analog signal.

Referring to step 8 (S8), the amplified part 21 is amplified by the counterpart voice signal converted into analog and output as voice through the speaker 23. Thus, the driver can hear the other party's voice through the speaker 23 of the audio system.

Referring to step 9 (S9), if the other party's voice signal is not input in step 5 (S5), the driver's voice signal is input through the microphone 31. The driver's voice signal input through the microphone 31 is an analog signal.

Referring to step 10 (S10), the driver's voice signal input is converted into a digital signal by the converter 17.

Referring to step 11 (S11), the digital processing unit 19 equalizes the driver's voice signal converted into the digital signal. Software equalization of the driver's voice signal completely eliminates high frequency noise, and also adds and subtracts the voice signal to reinforce the high and low sounds.

Referring to step 12 (S12), the equalized driver voice signal is wirelessly transmitted to the mobile communication terminal 29 through the Bluetooth module 25, and the mobile communication terminal 29 is transmitted to the counterpart mobile communication terminal.

As described above, the present invention performs the hands-free function of the driver mobile communication terminal in which the Bluetooth device is embedded by incorporating a Bluetooth module in the audio system without installing a separate hands-free inside the vehicle.

Therefore, since the present invention does not install a separate hands-free inside the vehicle, it is possible not only to prevent the occurrence of additional costs, but also to improve the space utilization inside the vehicle, and to reduce the driver's injury in the event of an accident. . In addition, since the wireless device performs a hands-free function, the driver can conveniently use the mobile communication terminal simply by carrying it without mounting it in the vehicle.

Claims (2)

An audio device composed of a radio, a cassette tape recorder and a CD player and a Bluetooth device, and a microcomputer controlling the operation of a driver mobile communication terminal wirelessly communicating with the other mobile communication terminal; A Bluetooth module for digitally transmitting and receiving the mobile communication terminal and the incoming / outgoing signal, the voice signal of the driver and the counterpart digitally; A key input unit which outputs a "hook on" signal to the micom by manipulating a key when an incoming / outgoing signal is generated to the mobile communication terminal; A microphone to which the voice signal of the driver is input while the mobile communication terminal is hooked on; A tuner configured to receive a radio signal of a corresponding frequency by tuning a broadcast by inputting a broadcast tuning signal through the microcomputer when an operation of the radio is selected; The mobile communication terminal converts a radio signal or a tape signal received from a tuner or a cassette tape recorder in a "hook off" state into a digital signal, and converts an equalized radio signal, a tape signal, or a signal from a CD player into an analog signal. And a converting unit converting the driver's voice signal into a digital signal and converting the voice signal of the other party equalized in the digital state into an analog signal while muting the voice signal of the audio device when the mobile communication terminal is in the "hook on" state. , The driver converts the digital signal, the CD player signal, or the voice signal of the other party to the Bluetooth module by equalizing the optimum tuning condition according to the type of the vehicle and outputs the driver voice signal to the Bluetooth module. And a digital processing unit for outputting the remaining signal to the conversion unit, And an amplifier for amplifying the analog signal converted by the converter and outputting the amplified analog signal to a speaker. A first step of determining whether the driver's mobile communication terminal is in a "hook on" state or feeding back to an initial state; A second step of muting the voice while the mobile communication terminal is in the " hook on " state, if any one of the audio devices is in the " on " state and automatically " on " Determining whether a voice signal of the other party is input to the Bluetooth module through the mobile communication terminal; A fourth step of digitally equalizing in the digital processing unit when the counterpart voice signal is input; A fifth step of converting and amplifying the equalized counterpart voice signal into an analog signal and outputting the voice through a speaker; A fifth step of inputting a driver voice signal through a microphone if the other party's voice signal is not input in the third step; A sixth step of converting the driver voice signal into a digital signal and equalizing in software; And a seventh step of wirelessly transmitting the driver's voice signal to the mobile communication terminal through the Bluetooth module.