KR19980083217A - Noise filtering device and method for hands-free system for automobile - Google Patents

Abstract

The present invention provides a user's transmission in a hands-free system for a car that maintains a free call without the driver attaching the mobile communication terminal in using the mobile communication terminal while driving to an arbitrary destination in the automotive voice recognition system. The noise signal mixed with the voice signal is stably filtered to provide a good call service to the receiver. The voice signal of the driver mixed with the noise applied from the first voice input means in the hands-free mode of a mobile phone. And detecting only the pure noise signal applied from the second voice input means, detecting a frequency level from the pure noise signal detected in the process, and mixing the noise with a frequency level of the detected noise signal. Pure filtering by performing filtering through voice signal It provides a high-quality call service characterized in that it comprises the step of extracting only the sex signal.

Description

Noise filtering device and method for hands-free system for automobile

The present invention relates to a voice recognition system for a vehicle, and more particularly, in the use of a mobile communication terminal for a vehicle while driving to an arbitrary destination, the driver is free without installing the mobile communication terminal (hereinafter referred to as a cellular phone). Noise filtering in the automotive hands-free system that provides a good call service to the receiver by stably filtering out the noise applied to the user's transmitted voice signal in the automobile hands-free system that maintains the call. An apparatus and a method thereof are provided.

In general, due to the development of technology, the development of communication networks, and the development of field services, mobile phones capable of conducting high-quality calls in ships, automobiles, and aircraft moving through wireless channels are widely used.

In this way, when the driver performs a call while the driver is driving in a car by using a mobile phone that talks with the other party in a state of need, the attention of the road ahead is insufficient, and the body part of the driver is restrained. This prevents safe driving according to the speed of the road and the road conditions, thereby providing an incentive for accidents that result in loss of life and property.

Therefore, an automobile hands-free system connected with a mobile phone is widely used and used to make a call with an arbitrary state room in a state where there is no driver's body restraint in an automobile.

As described above, the conventional automobile hands-free system for maintaining a free communication with any state room without restraining the driver's body, as shown in FIG. The microphone 1 is provided at a position of the microphone 1 for inputting a driver's transmission voice signal and converting the signal into an electrical signal when the call is executed without any body restraint with the other party having the communication path formed therein. The voice recognition module 2 recognizes an electrical voice signal and processes the signal in a predetermined state and outputs the signal, and the base station receives the relay service after processing the signal applied from the voice recognition module 2 in a predetermined state. It transmits to the other party through which the call path is formed through any wireless channel, which is received through the relay of the base station from the other party. Comprises a handset (4), a control section 3 for controlling the overall operations executed for the processing of the transmission voice signal of the speech recognition module (2) for transmission via a not shown audio output unit for audio.

The operation of executing a call without restraining the driver's body using the conventional automobile hands-free system as described above is as follows.

When the driver connects the mobile phone to the hands-free system provided in the vehicle, and the communication path is formed with the other party through the allocated wireless channel from any base station that provides the relay service, the driver is in a state of no body restraint. The driver's transmission voice is input through the microphone 1 provided around the driver's mouth.

At this time, the microphone 1 converts an input driver's transmission voice into an electrical signal and then applies a signal to the voice recognition module 2 to control the voice recognition module 2. Converts an electric transmission voice signal applied according to the predetermined state into a predetermined state, and then transmits it to the state room to which the call path is connected through the mobile phone 4.

As described above, in the conventional automotive hands-free system, when the driver's transmission voice is input through the microphone, since the performance of the microphone has a high sensitivity or higher, ambient noise is mixed and applied together with the transmission voice and thus the transmission voice and Since filtering frequency band cannot be set for filtering the mixed noise component, reliable filtering cannot be performed and the driver's transmission voice signal recognition rate is lowered. There was a problem that caused discomfort.

An object of the present invention for solving the above problems is to detect the second microphone having a second microphone for inputting only the noise for the indoor communication environment in addition to the microphone for inputting the driver's transmission voice in the vehicle hands-free system It is possible to stably filter out the noise mixed in the transmission voice by filtering the transmission voice by the noise level, and to provide a high quality call service to the other party with the reliability and communication path in the transmission of the driver's transmission voice. A noise filtering device and a method thereof are provided.

1 is a configuration block diagram of a hands-free system applied to a conventional vehicle,

2 is a block diagram of a noise filler device for an automobile hands-free system according to the present invention;

3 is a flowchart illustrating an operation of a signal processor in the present invention illustrated in FIG. 2.

Explanation of symbols on the main parts of the drawings

10: first microphone 20: second microphone

30: signal processing unit 40: voice recognition module

50: control unit 60: mobile phone

A feature of the present invention for achieving the above object is, the first voice input means for converting the driver's transmission voice signal into an electrical signal in the state of the hands-free call mode, and the noise signal of the vehicle interior in the state of the hands-free call mode Processing a voice signal and a noise signal applied from the first voice input means and the second voice input means to a predetermined state and filtering the second voice input means for converting the bay into an electrical signal, and filtering only the pure voice signal A voice signal processing means, a voice recognition module for recognizing the extracted voice signal and processing it in a predetermined state, and then applying it to a mobile station on which a base station providing a relay service and a communication channel of a wireless channel are formed, and a set operating program The control means for controlling the overall operation of the voice signal processing means and the voice recognition module according to Compared are used.

An additional feature of the present invention for achieving the above object is that the first voice input means is installed close to the driver's mouth at a predetermined position around the driver's seat side, and the second voice input means is predetermined on the floor of the vehicle interior. It is installed at the location to input only the noise of the room.

An additional feature of the present invention for achieving the above object is that the voice signal processing means includes a level detector for detecting a frequency level of a noise signal applied from the second voice input means, and applied from the first voice input means. It is composed of a mixer that extracts only a pure voice signal by calculating a signal mixed with voice and noise and a signal applied from the level detector.

Another feature of the present invention for achieving the above object is, in the hands-free mode of a mobile phone for a vehicle noise signal of the driver mixed with the noise applied from the first voice input means and the pure noise signal applied from the second voice input means Pure voice by performing a step of detecting only, a step of detecting a frequency level from a signal of pure noise detected in the step, and filtering a voice signal mixed with the noise at a frequency level of the detected noise signal It involves extracting only signals.

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

As can be seen in Figure 2, the noise filtering device of the hands-free system for automobiles according to the present invention is installed in a predetermined position around the driver's seat near the driver's mouth and provides any radio assigned from the base station providing the relay service. A first microphone 10 for converting a transmission voice signal input by a user, that is, a driver, and an ambient noise signal into an electrical signal for transmission to any counterpart having a communication path through a channel; A second microphone 20 which is installed in a position close to the engine and inputs a noise signal generated in an interior of a vehicle and converts the noise signal into an electrical signal, and a voice signal mixed with noise applied from the first microphone 10; After processing the noise signal applied from the second microphone 20 in a predetermined state, the first microphone 10 according to the set algorithm The voice signal processor 30 extracts only the pure voice signal by filtering only components of the noise signal applied from the second microphone 20 from the mixed voice signal with the applied noise, and the signal extracted and applied only with the pure voice signal. Recognizes and processes it in a predetermined state and then applies it to the mobile phone 60 on which the base station providing the relay service and the communication channel of the wireless channel are formed, and the voice signal processing unit according to the set operating program ( 30) and a controller 50 for controlling the overall operation of the voice recognition module 40.

In the present invention having the function as described above, the filtering operation of the noise component mixed and applied to the transmission voice during hands-free communication will be described with reference to FIG. 3.

If a driver establishes a call path with any other party through a wireless channel allocated from any base station providing a relay service while the driver is connected to a hands-free system according to the present invention provided with a mobile phone, the driver may In order to conduct a call without restraint, the user enters the hands-free call mode and inputs the driver's transmission voice through the first microphone 10 installed near the driver's mouth.

In this case, as the first microphone 10 to which the driver's transmission voice signal is input, as shown in FIG. 3, the first microphone is mixed with the driver's voice and noise generated inside the vehicle is input. 10 converts the driver's transmitted voice and noise signals into electrical signals and then applies the signals to the voice recognition module 30.

At the same time, when the mobile phone 60 enters the hands-free communication mode, various noises such as the engine noise generated in the interior of the vehicle are installed in the second microphone 20 installed near the engine at a predetermined position on the floor of the interior of the vehicle. Only a signal is input, converted into an electrical signal, and then applied to the voice signal processor 30.

As shown in FIG. 3, the voice signal processor 30 may include a signal to which the voice and noise applied from the first microphone 10 are mixed and applied according to a predetermined control signal applied from the controller 50. The level detector 31 receives the noise-only signal applied from the second microphone 20 to process a noise-only signal applied through the second microphone 20 to perform a filtering operation for extracting only a pure voice signal. After extracting the frequency band through the voice and noise is applied from the first microphone 10 is applied to the mixer 32 is applied to the signal applied to one side.

The mixer 32 calculates a signal in which the voice and noise applied by the first microphone 10 are mixed and a signal in which the frequency band of the noise signal is extracted and applied through the level detector 31. 1 Only the components of the noise are removed from the voice and noise signal applied from the microphone 10 to extract the pure voice signal, and then apply it to the voice recognition module 40.

The voice recognition module 40 recognizes the frequency of the voice band from the signal extracted and applied to only the pure voice signal by the voice signal processor 30 and then executes a predetermined process according to the control signal applied from the controller 50. Is applied to any base station that provides a relay service through a wireless channel to a mobile phone 60 having a communication path, and stably transmits the driver's transmission voice to any other party having a communication path, thereby allowing the other party to Improve the dignity.

By continuously analyzing the state of the audio signal output after the filtering operation, the detected signal is fed back to the adaptive algorithm 31 to adjust the filtering level of the adaptive algorithm 31 so as to vary according to road conditions or driving conditions. Active filtering is performed on the noise to be provided to provide stability and reliability to the signal output to the voice recognition module 40 side.

As described above, the automotive hands-free system according to the present invention is a noise mixed with an input voice signal for transmission through the level of noise generated in the interior of a vehicle in the hands-free communication mode without the driver's body restraint. By filtering the components of, only pure voice signals are extracted to provide high quality call sensitivity for calls over wireless channels. In addition, the voice recognition module also provides a reliable recognition of the voice signal interfaced to the mobile phone because the recognition of the voice signal for transmission is made stable.

Claims (5)

In the car hands free system, First voice input means for converting a driver's transmit voice signal into an electric signal in a hands free communication mode; Second voice input means for converting only a noise signal in a vehicle interior into an electrical signal in the hands-free communication mode; Voice signal processing means for processing the voice signal and the noise signal applied from the first voice input means and the second voice input means in a predetermined state and filtering the extracted voice signal; A voice recognition module which recognizes the extracted and applied voice signal, processes it in a predetermined state, and then applies it to a base station that provides a relay service and a mobile phone on which a communication channel of a wireless channel is formed; And a control means for controlling the overall operation of the voice signal processing means and the voice recognition module according to a set operation program. The method of claim 1, wherein the first voice input means is installed near a driver's mouth at a predetermined position around the driver's seat side, and the second voice input means is installed at a predetermined position on the floor of the vehicle interior to provide only noise in the room. Noise filtering device of an automobile hands-free system, characterized in that the input. 2. The apparatus of claim 1, wherein the voice signal processing means comprises: a level detector for detecting a frequency level of a noise signal applied from the second voice input means; Noise filtering device for a hands-free system for a vehicle, characterized in that the mixer is configured to extract a signal of pure voice by calculating a signal mixed with a voice and noise applied from the first voice input unit and a signal applied from the level detector. . In the voice processing method of an automobile hands-free system, in the hands-free mode of an automobile cellular phone, only the driver's voice signal mixed with the noise applied from the first voice input means and the pure noise signal applied from the second voice input means are provided. Detecting; Detecting a frequency level in the pure noise signal detected in the above process; And extracting only the pure voice signal by performing filtering through the operation on the voice signal mixed with the noise at the frequency level of the detected noise signal. The noise filtering method of an automobile hands-free system according to claim 4, wherein, in the process, feedback of a pure voice signal is extracted and the frequency level for filtering is reset.