JPH0944183A - Level display device, voice recognition device and navigation device - Google Patents

Abstract

It is an object of the present invention to provide a level display device, a voice recognition device, and a navigation device, which have an object of displaying an appropriate generated sound volume capable of distinguishing noise from voice. SOLUTION: This voice recognition device 9 turns on or off a microphone 1 for converting voice and ambient noise into an electric signal, an amplifier 2, an A / D converter 3, and a voice input and a noise input. The talk switch 8 to be switched, the memory 5 for storing the noise level, the noise level when the talk switch 8 is off are stored in the memory 5, and the noise level and the voice level are compared when the talk switch 8 is on. It has a microprocessor 4 for detecting whether or not the sound level is appropriate, an output port 6, and a level indicator 7 for displaying the sound level by an LED.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a level display device, a voice recognition device and a navigation device suitable for use in a navigation device for displaying a road map or the like corresponding to voice input.

[0002]

2. Description of the Related Art Conventionally, various navigation devices to be mounted on automobiles have been developed. This navigation device is, for example, a CD-R in which road map data is stored.
It is composed of a large-capacity data storage means such as an OM, a current position detection means, and a display device for displaying a road map in the vicinity of the detected current position based on the data read from the data storage means.

In this case, as means for detecting the current position,
GPS (Global Positioning Sy)
A system that uses a positioning system that uses satellites for positioning called "system", or that uses autonomous navigation that tracks changes in the current position from the departure point based on information such as the traveling direction and traveling speed of the vehicle. There is.

The map displayed on the display device can be displayed not only in the vicinity of the current position but also in the desired position as long as there is map data, by performing a key operation or the like. I am doing it.

In the case of such a navigation device, for example, in the case of an automobile, a display device is installed in the vicinity of the driver's seat, and a map near the current position is provided while the driver is traveling or temporarily stopped, such as a signal stop. It is common to be able to see.

[0006]

By the way, it is necessary to operate such a navigation device so that it does not interfere with driving of a car. For example, complicated operation is prohibited during running. is there. That is, when such a navigation device is installed in a vehicle, it is connected to some running state detection unit (for example, a parking brake switch of an automobile), and the state of the detection unit detects that the vehicle is stopped. It is set so that all operations can be performed only when the vehicle is turned on, and complicated key operations are prohibited when it is not stopped (that is, while the vehicle is running).

[0007] However, it is inconvenient that the operation such as switching the displayed map cannot be performed while the vehicle is running, and even if the vehicle is running, it is possible to perform advanced operation so as not to disturb the driving. Was requested.

Therefore, the applicant of the present invention performs voice processing for recognizing only a specific voice from a voice signal input from a microphone or the like, converts the recognized specific data into absolute coordinate position data, and outputs the absolute coordinate position data. Performs voice processing that recognizes only specific voice from the voice signal input from the voice recognition device that has been set up and a microphone, and displays the map near the absolute coordinate position for the recognized specific data. The application (Japanese Patent Application No. 7-110987) relating to such a navigation device was previously submitted.

However, in such a voice recognition device and a navigation device, although the microphone for inputting voice is attached at a position where the target voice can be input most efficiently, the voice to be input in a general use environment is desired. At the same time, noise around the microphone is also input.

Therefore, in order to distinguish the voice from the noise, when performing the voice recognition, the voice around the microphone that inputs the voice for the voice recognition is talked at a volume higher than a certain level. The person had to utter, and there was a request to improve this point.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a level display device, a voice recognition device, and a navigation device for displaying an appropriate generated sound volume capable of distinguishing noise from voice.

[0012]

The level display device of the present invention compares the input noise level with the input audio signal level, and the ratio of the audio signal level to the noise level is a predetermined value or more. A control means for detecting whether or not it is provided, and a predetermined display is performed when it is detected that the ratio of the audio signal level is equal to or more than a predetermined value.

Further, the voice recognition device of the present invention includes voice signal input means, storage means for storing the noise level input by the voice signal input means, the noise level and the voice stored in the storage means. A control unit that compares the audio signal level input by the signal input unit and detects whether the ratio of the audio signal level to the noise level is a predetermined value or more; And a display unit for performing a predetermined display when it is detected that the ratio is equal to or higher than a predetermined value.

Further, the navigation device of the present invention comprises:
Audio signal input means, storage means for storing the noise level input by the audio signal input means, and comparison of the noise level stored by the storage means with the audio signal level input by the audio signal input means And a control means for detecting whether or not the ratio of the audio signal level to the noise level is equal to or higher than a predetermined value, and the control means detects that the ratio of the audio signal level is equal to or higher than a predetermined value. , A voice recognition unit having a display unit for performing a predetermined display, a conversion unit for converting data of a specific voice recognized by the voice recognition unit into coordinate position data, a map data storage unit, and a conversion unit. Map data reading means for reading map data at a position indicated by the coordinate position data thus created from the map data storage means and creating a map display video signal. It is those with a.

The level display device of the present invention has the following functions. This level display device operates so as to secure S / N above a certain level in order to secure a voice recognition rate above a certain level. The control means compares the noise level and the voice level. Then, the control means determines whether or not the S / N is a certain level or higher at which the voice level is recognized with respect to the noise level at this time. S / above a certain level with control means
If it is determined to be N, a predetermined display is displayed. The speaker speaks while looking at this display. Then, the volume of the voice when uttering is adjusted. By doing so, the S / N required for the level display device, which is equal to or higher than a certain fixed value, can be clearly indicated to the speaker.

Further, according to the voice recognition device of the present invention, the following operations are performed. This voice recognition device operates so as to secure an S / N of a certain level or higher in order to secure a voice recognition rate of a certain level or higher. When the control means determines by the input instructing means that it is not the voice input section, the voice signal input means converts ambient noise into an electric signal. This electric signal is amplified to a signal level capable of signal processing, then converted into a digital signal and supplied to the control means. The control means supplies a digital signal representing the noise level to the storage means for storage. This allows
The noise level of the input is captured and written.

Here, the control means samples the noise level and performs statistical processing so as to obtain an average value so as not to capture a sudden large noise different from the noise of the use environment as the noise level. Further, the noise level is processed by the control means so that the latest value is taken in and rewritten at every certain period. When the control means determines by the input instructing means that it is the voice input section, the control means converts the voice uttered by the speaker into an electric signal. The converted electric signal is amplified to a signal level capable of signal processing, then converted to a digital signal and supplied to the control means. As a result, the audio level of the input is captured.

Next, the control means reads the noise level stored in the storage means and compares the noise level with the voice level. Then, the control means determines whether or not the S / N is a certain level or higher at which the voice level is recognized with respect to the noise level at this time. When the control means determines that the S / N is above a certain level, the display means displays that the S / N is above the certain level. The comparison between the voice level and the noise level here is sequentially performed in a predetermined cycle. The display of the comparison result is
Try to repeat in a short cycle. The speaker speaks while looking at this display. Then, the volume of the voice when uttering is adjusted.
By doing so, it is possible to clearly indicate to the speaker the S / N that is necessary for the voice recognition device and is above a certain fixed value.

Further, according to the navigation device of the present invention, the following operations are performed. When the voice recognition unit determines that the control means has an S / N above a certain level, the display means displays that the S / N is above a certain level. When the display of the display unit is performed and the S / N of a certain value or more required for the voice recognition unit is obtained, the control unit supplies the voice data to the conversion unit. The conversion unit converts the specific voice data recognized by the voice recognition unit into coordinate position data. The map data reading means reads the map data at the position indicated by the coordinate position data converted by the conversion unit from the map data storage means and creates a map display video signal. This makes it possible to obtain a map display video signal required for navigation.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The present embodiment will be described below. First, the configuration of this embodiment will be described. FIG. 1 is a block diagram showing the configuration of the speech recognition apparatus of this embodiment. The voice recognition device 9 includes a microphone 1 for converting voice and ambient noise into an electric signal, an amplifier 2 for amplifying the electric signal with a predetermined amplification factor, and an A / D conversion for converting the amplified electric signal into a digital signal. Device 3, a talk switch 8 for switching between voice input and noise input by turning on or off, a memory 5 for storing the noise level, and a noise level in the memory 5 when the talk switch 8 is off. A microprocessor 4 that compares the noise level with the voice level to detect whether the voice level is appropriate when 8 is on; and an output port 6 that outputs the voice level detected by the microprocessor 4. It has a level indicator 7 for displaying the audio level output to the output port 6 with an LED. Here, the microphone 1 constitutes audio signal input means, the memory 5 constitutes storage means, the macro processor 4 constitutes control means, and the level indicator 7 constitutes display means.

The operation of the speech recognition apparatus thus configured will be described below. Here, in an ideal environment for voice recognition, there is no external noise, only the voice to be recognized is picked up by the microphone 1, amplified by the amplifier 2, and converted into a digital signal by the A / D converter 3. The converted data is supplied to the microprocessor 4. On the other hand, in a general usage environment, ambient noise is present in most cases, and the noise is supplied to the microprocessor 4 in a state where unnecessary noise is superimposed on the audio signal. In this case, the voice signal / noise level ratio (S / N) directly affects the voice recognition rate of the voice recognition device. That is, in order to secure the recognition rate above a certain level, the S above a certain level is required.
/ N must be secured. The operation for this will be described below.

FIG. 2 is a flow chart showing the operation of the speech recognition apparatus of this embodiment. In FIG. 2, when starting, the microprocessor 4 determines whether or not the talk switch 8 is on in step S1. When the talk switch 8 is off, the talk switch 8 supplies the microprocessor 4 with a signal indicating that it is not in the voice input section. When the microprocessor 4 determines in step S1 that the talk switch 8 is off,
The microphone 1 converts ambient noise into an electric signal.
This electric signal is supplied to the amplifier 2. The amplifier 2 amplifies the electric signal to a signal level capable of signal processing. The amplified electric signal is supplied to the A / D converter 3. A / D
The converter 3 converts the supplied analog electric signal into a digital signal. The digital signal is supplied to the microprocessor 4. In step S2, the microprocessor 4
Supplies a digital signal representing the noise level to the memory 5 for storage. As a result, the noise level of the microphone input is captured and written. Then, the process returns to step S1.

Here, the microprocessor 4 samples the noise level and removes the maximum value and the minimum value of the noise level so as not to capture a sudden large noise different from the noise of the use environment as the noise level. Statistical processing is performed so as to take the average value. Further, the noise level is processed by the microprocessor 4 so that the latest value is taken in and rewritten every certain period.

When the talk switch 8 is on, the talk switch 8 supplies a signal to the microprocessor 4 to indicate that it is a voice input section. When the microprocessor 4 determines in step S1 that the talk switch 8 is on, the microphone 1 converts the voice uttered by the speaker into an electric signal. The converted electric signal is supplied to the amplifier 2. The amplifier 2 amplifies the electric signal to a signal level capable of signal processing. The amplified electric signal is supplied to the A / D converter 3. The A / D converter 3 converts the supplied analog electric signal into a digital signal. The converted digital signal is sent to the microprocessor 4
Is supplied to. In step S3, the microprocessor 4 temporarily stores the digital signal representing the audio level in the internal RAM. As a result, the audio level of the microphone input is captured.

Next, in step S4, the microprocessor 4 reads out the noise level stored in the memory 5 and the voice level temporarily stored in the internal RAM to obtain the noise level and the voice level. Make a comparison. Then, in step S4, the microprocessor 4
Determines whether the S / N is a certain level or higher with which the voice level is recognized with respect to the noise level at this time. When it is determined in step S4 that the microprocessor 4 does not have an S / N above a certain level, the process returns to step S1. When the microprocessor 4 determines in step S4 that the S / N is above a certain level, the microprocessor 4 causes the level indicator 8 to display that the S / N is above the certain level in step S6. . Then, the process returns to step S1. The display on the level indicator 8 is performed, for example, by turning on an LED.

The comparison between the voice level of the microphone input and the noise level is performed sequentially in a predetermined cycle. The lighting display of the level indicator 8 as a result of the comparison is repeated in a short cycle. The speaker speaks while watching the lighting display of the level display 8. Then, the volume of the voice at the time of utterance is adjusted so that the lighting display of the level indicator 8 is repeated in a short cycle. By doing so, the S / N required for the voice recognition device, which is equal to or higher than a certain value, can be immediately specified to the speaker.

In the above example, the microphone 1 and the amplifier 2
, A / D converter 3, talk switch 8, and memory 5
Although the voice recognition device having the microprocessor 4, the output port 6 and the level indicator 7 has been described, the microphone 1, the amplifier 2, the A / D converter 3, the talk switch 8 and the memory 5 are described. And a microprocessor 4
The output port 6 and the output port 6 may be integrated with the level indicator 7. At this time, for example, a talk switch 8 corresponding to a recording key in the recording device,
The memory 5 and the microprocessor 4 to which the digital voice signal or the digital noise signal is supplied may be provided integrally with the level indicator 7. Also,
Also at this time, when the talk switch 8 is off, it is indicated that it is not in the voice input section for the microprocessor 4, and when the talk switch 8 is on, it is in the voice input section for the microprocessor 4. As shown. Further, the noise level at this time is also rewritten by taking in the latest value at every certain period.

Next, a navigation device using such a voice recognition device will be described. FIG. 3 is a block diagram showing the configuration of a navigation device according to another embodiment. First, the configuration of this navigation device will be described.
It should be noted that description of portions common to the voice recognition device 9 shown in FIG. 1 will be omitted. The navigation device of this example includes a voice recognition device 9, a navigation device 20, and a display device 40. A voice recognition data storage ROM 12 and a latitude / longitude conversion circuit 10 are connected to the microprocessor 4 in the voice recognition device 9, and a longitude / latitude conversion data storage ROM 11 is connected to the longitude / latitude conversion circuit 10.
The voice recognition device 9 constitutes a voice recognition unit. The navigation device 20 includes a GPS antenna 21, a current position detection circuit 22, an arithmetic circuit 23, and a CD-ROM driver 2
4, RAM 25, vehicle speed sensor 26, operation keys 27
And a video signal generation circuit 28, a voice synthesis circuit 31, and a speaker 32. The conversion circuit 10 is a conversion unit, CD-
ROM is map data storage means, CD-ROM driver 2
Reference numeral 4 constitutes a map data reading means.

The operation of the navigation device thus configured will be described below. It should be noted that description of portions common to the voice recognition device 9 shown in FIG. 1 will be omitted. When the lighting display of the level indicator 7 is repeated in a short cycle and the S / N required for the voice recognition device is equal to or higher than a certain value, the microprocessor 4 performs the voice recognition process. That is, the microprocessor 4 uses a predetermined voice recognition algorithm (for example, HMM: Hidden Markov Model) for the voice recognition data stored in the voice recognition data storage ROM 12 and the voice vector data of the microphone input.
When a match is detected based on a predetermined condition, the character data stored corresponding to the voice vector data is read out.

The voice recognition data storage ROM 12 stores data for recognizing only the place name and the words instructing the operation of the navigation device. When the character code corresponding to the voice vector data whose match with the voice vector data is detected is the character code of the place name, the microprocessor 4 reads this character code from the voice recognition data storage ROM 12. The read character code is supplied to the latitude / longitude conversion circuit 10. The latitude / longitude conversion circuit 10 stores the longitude / latitude data corresponding to this character code and its associated data in the ROM 11 for storing the longitude / latitude conversion data.
Read from In the latitude / longitude conversion data storage ROM 11, a storage area is set for each character code that is the same as the character code of the place name stored in the voice recognition data storage ROM 12, and for each character code, the latitude of the place name indicated by that character is set. And longitude data, and display scale data as associated data are stored.

Then, the ROM 1 for storing the latitude / longitude conversion data
The latitude and longitude data read from the data 1 and its associated data are supplied to the arithmetic circuit 23 of the navigation device 20. In addition, the data of the character code whose match is detected by the microprocessor 4 is also supplied to the arithmetic circuit 23 of the navigation device 20. In the navigation device 20, the current position detection circuit 22 receives and processes the positioning signal from the GPS satellite received by the antenna 21, and analyzes the received data to detect the current position. The data of the detected current position is data of latitude and longitude, which are absolute positions at that time.

The detected latitude and longitude data are supplied to the arithmetic circuit 23. The arithmetic circuit 23 is a circuit that functions as a system controller that controls the operation of the navigation device 20. When the latitude and longitude coordinate data are obtained, the arithmetic circuit 23 uses the CD-ROM driver 24.
CD-ROM that stores road map data
Control is performed so that road map data near the coordinate position is read from the (optical disk). The arithmetic circuit 23 is a CD-ROM
The road map data read by the driver 24 is stored in the RAM 25
The display data for displaying the road map is created using the stored road map data. At this time, the display data is such that the map is displayed at the display scale (scale) set by operating the operation keys 27 or the like.

The display data created by the arithmetic circuit 23 is supplied to the video signal generating circuit 28. Video signal generation circuit 2
Reference numeral 8 generates a video signal in a predetermined format based on the display data. The video signal is supplied to the display device 40. The display device 40 performs an image receiving process based on a video signal and displays a road map or the like on its display panel. In addition to displaying a road map near the current position, a road map at a position designated by operating the operation key 27 or the like is also displayed under the control of the arithmetic circuit 23. Further, when the vehicle speed sensor 26 detects traveling of the vehicle, the arithmetic circuit 23 does not accept any operation other than a relatively simple operation of the operation keys 27.
When the arithmetic circuit 23 needs to give a voice instruction, the voice synthesizing circuit 31 executes the voice synthesizing process and outputs the voice from the speaker 32. In the above example, when the talk switch 8 is off, the voice recognition device 9 indicates to the microprocessor 4 that it is not in the voice input section, and when the talk switch 8 is on, the voice recognition is performed to the microprocessor 4. It indicates that it is an input section. Further, the noise level at this time is also rewritten by taking in the latest value at every certain period. By doing this, even if the noise level of the engine sound etc. due to the difference in the speed of the car is different, the latest noise level is fetched at regular intervals and this noise level is compared with the voice level for voice recognition. It is possible to display a case where an appropriate S / N is obtained to enable the above.

FIG. 4 is a diagram showing the level of voice recognition in the navigation device. In FIG. 4, the vertical axis represents the number of words uttered by the unspecified speaker and the specific speaker on a logarithmic scale, and the horizontal axis represents S / N [dB]. In FIG. 4, in the case of place name recognition, when the number of words spoken by an unspecified speaker is about 2000 and the number of words spoken by a specified speaker is about 20000, the S / N is about +15 [dB] to about +4. It is [dB]. In the case of a command or the like, when the number of words spoken by the unspecified speaker is about 300 and the number of words spoken by the specified speaker is about 3000, S
/ N is about +13 [dB], and when the number of words spoken by the unspecified speaker is about 70 and the number of words spoken by the specified speaker is about 700, the S / N is about +3 [dB].
That is, in the case of a command or the like, a predetermined recognition rate can be obtained even with a low S / N by reducing the number of words, and the required S / N increases as the number of words increases. For example, if one speech recognition device recognizes a place name with 2000 words for an unspecified speaker and a command with 300 words for an unspecified speaker, the maximum value required for recognizing a place name is about +1.
If the S / N is 5 [dB] or more, it is possible to obtain a recognition rate above a predetermined level for all words.

[0035]

According to the level display device of the present invention, the input noise level is compared with the input audio signal level, and it is determined whether the ratio of the audio signal level to the noise level is a predetermined value or more. When the ratio of the audio signal level is detected to be equal to or more than a predetermined value, a predetermined display is performed. Therefore, based on the input audio signal and noise, Even if the background noise is relatively large and it is a stationary noise, the volume of the utterance necessary for recognizing the voice in that environment is not the absolute voice input level display but the noise. The level can be clearly indicated by the relative level display between the level and the input voice level, and the quality of the level display can be improved.

Further, according to the level display device of the present invention, in the above description, the audio signal input means, the storage means for storing the noise level input by the audio signal input means, and the audio signal of the audio signal input means. Is provided to enable or disable the input operation of the input instruction means, and when the instruction of the input instruction means invalidates the input operation of the audio signal, the noise level is stored in the storage means, and the instruction of the input instruction means is stored. Since the noise level stored in the storage means and the voice signal level are compared by the control means when the input operation of the voice signal is enabled, the voice signal and the noise are switched and input. do it,
Based on this, the volume of utterance required for voice recognition can be specified by the relative level display between the noise level and the input voice level, rather than the absolute voice input level display. Can be improved.

Further, according to the level display device of the present invention, in the above, the comparison operation for comparing the input noise level with the input audio signal level and the ratio of the audio signal level to the noise level are predetermined. Since the detection operation of detecting whether or not the value is equal to or more than the value is repeated every predetermined period, even when the background noise in the usage environment changes, the latest noise level is used.
The volume of utterance required for voice recognition can be specified by the relative level display between the noise level and the input voice level, rather than the absolute voice input level display, and the quality of the level display can be improved. it can.

According to the voice recognition device of the present invention,
Audio signal input means, storage means for storing the noise level input by the audio signal input means, and comparison of the noise level stored by the storage means with the audio signal level input by the audio signal input means And a control means for detecting whether or not the ratio of the audio signal level to the noise level is equal to or higher than a predetermined value, and the control means detects that the ratio of the audio signal level is equal to or higher than a predetermined value. Since the background noise in the environment of use is relatively large and the noise is stationary, the volume of the utterance necessary for recognizing the voice in the environment is provided since the background noise in the environment of use is relatively large. Can be clearly indicated by the lighting display by the display means instead of the abstract display such as "large" or "small", thereby improving the voice recognition rate. Door can be.

According to the voice recognition device of the present invention,
In the above description, the input instruction means for validating or invalidating the voice signal input operation of the voice signal input means is provided, and the noise level is stored when the instruction of the input instruction means invalidates the voice signal input operation. When the instruction of the input instructing means validates the input operation of the audio signal, the noise level and the audio signal level stored in the storage means are compared. Switching between noise and input, and based on this, the volume of utterance required for voice recognition is set to "large" or "small".
Instead of such an abstract display, it can be clearly indicated by a lighting display by the display means, and the voice recognition rate can be improved.

According to the voice recognition device of the present invention,
In the above description, since the storage means for storing the noise level is configured to rewrite and store the noise level for each predetermined period, even if the background noise in the usage environment changes, the latest noise level is used and the voice The volume of utterance required for recognition is set to "large" or "small".
Instead of such an abstract display, it can be clearly indicated by a lighting display by the display means, and the voice recognition rate can be improved.

According to the navigation device of the present invention, the audio signal input means, the storage means for storing the noise level input by the audio signal input means, the noise level stored in the storage means, and the noise level Compare the audio signal level input by the audio signal input means,
Control means for detecting whether or not the ratio of the audio signal level to the noise level is equal to or higher than a predetermined value, and a predetermined value when the control means detects that the ratio of the audio signal level is equal to or higher than a predetermined value. A voice recognition section having display means for displaying, a conversion section for converting data of a specific voice recognized by the voice recognition section into coordinate position data, a map data storage means, and a conversion section converted by the conversion section. Since the map data at the position indicated by the coordinate position data is read from the map data storage means and the map data reading means for creating the map display video signal is provided, the background noise in the use environment is relatively large, and If it is a stationary noise, the volume of the utterance necessary for recognizing the voice in that environment is represented by an abstract table such as "large" or "small". Rather, can be evidenced by the lighting display by the display unit, it is possible to improve the speech recognition rate, thereby performing an operation appropriate navigation.

Further, according to the navigation apparatus of the present invention, in the above description, the voice recognition section is provided with input instruction means for enabling or disabling the input operation of the voice signal of the voice signal input means, and the input instruction means is provided. The noise level is stored in the storage means when the input operation of the audio signal is invalidated, and the noise level is stored in the storage means when the input operation of the audio signal is enabled. Since the noise level and the voice signal level are compared with each other, the voice signal and the noise are switched and input, and based on this, the volume of utterance required for voice recognition,
Instead of the "large" or "small" abstract display, it can be clearly indicated by the lighting display by the display unit, and the voice recognition rate can be improved, whereby an appropriate navigation operation can be performed.

Further, according to the navigation apparatus of the present invention, in the above description, the storage means for storing the noise level of the voice recognition unit rewrites and stores the noise level every predetermined period, so that the environment of use Even if the background noise in the changes, the latest noise level is used to determine the volume of utterance required for voice recognition.
Instead of the "large" or "small" abstract display, it can be clearly indicated by the lighting display by the display unit, and the voice recognition rate can be improved, whereby an appropriate navigation operation can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a voice recognition device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the voice recognition device in one embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a navigation device according to another embodiment of the present invention.

FIG. 4 is a diagram showing levels of voice recognition in a navigation device according to another embodiment of the present invention.

[Explanation of symbols]

1 Microphone (voice signal input means) 2 Amplifier 3 A / D converter 4 Microprocessor (control means) 5 Memory (storage means) 6 Output port 7 Level indicator (display means) 8 Talk switch (input instruction means) 9 Voice Recognition device 10 Conversion circuit (conversion part) 11 ROM for latitude and longitude conversion data storage 12 ROM for voice recognition data storage 20 Navigation device 21 GPS antenna 22 Current position detection circuit 23 Arithmetic circuit 24 CD-ROM driver (map data reading means) 25 RAM 26 Vehicle Speed Sensor 27 Operation Keys 28 Video Signal Generation Circuit 31 Voice Synthesis Circuit 32 Speaker 40 Display Device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location // G08G 1/0962 9289-5L G06F 15/40 370E

Claims (9)

[Claims] 1. A control means for comparing the input noise level with the input audio signal level to detect whether the ratio of the audio signal level to the noise level is equal to or more than a predetermined value. A level display device which performs a predetermined display when it is detected that the ratio of the audio signal levels is equal to or higher than a predetermined value. 2. The level display device according to claim 1, wherein the audio signal input means, the storage means for storing the noise level input by the audio signal input means, and the audio signal of the audio signal input means. An input instruction means for validating or invalidating the input operation is provided, and when the instruction of the input instruction means invalidates the input operation of the audio signal, the noise level is stored in the storage means, and the instruction of the input instruction means is A level display device characterized in that, when an input operation of an audio signal is made effective, the noise level stored in the storage means and the audio signal level are compared by the control means. 3. The level display device according to claim 1, wherein a comparison operation for comparing the input noise level with the input audio signal level and a ratio of the audio signal level to the noise level are predetermined values. A level display device characterized in that a detection operation for detecting whether or not the above is performed is repeatedly performed every predetermined period. 4. A voice signal input means, a storage means for storing a noise level input by the voice signal input means, a noise level stored in the storage means, and a voice input by the voice signal input means. Control means for comparing with the signal level to detect whether the ratio of the audio signal level to the noise level is a predetermined value or more; and the control means, the ratio of the audio signal level is a predetermined value or more. A voice recognition device, comprising: a display unit that performs a predetermined display when the detection is performed. 5. The voice recognition device according to claim 4, further comprising input instruction means for validating or invalidating the input operation of the voice signal of said voice signal input means, and the instruction of said input instruction means is a voice signal. When invalidating the input operation, the noise level is stored in the storage means, and when the instruction of the input instructing means enables the input operation of the audio signal, the noise level and the noise level stored in the storage means are stored. A voice recognition device characterized by being compared with a voice signal level. 6. The voice recognition device according to claim 4, wherein the storage unit for storing the noise level is configured to rewrite and store the noise level every predetermined period. 7. A voice signal input means, a storage means for storing the noise level input by the voice signal input means, a noise level stored in the storage means, and a voice input by the voice signal input means. Control means for comparing the signal level with the noise level to detect whether or not the ratio of the audio signal level to the noise level is a predetermined value or more; and the control means, the ratio of the audio signal level is a predetermined value or more. When detecting, a voice recognition unit having a display unit for performing a predetermined display, a conversion unit for converting the data of the specific voice recognized by the voice recognition unit into coordinate position data, a map data storage unit, The map data for reading the map data at the position indicated by the coordinate position data converted by the conversion unit from the map data storage means to create a map display video signal. Navigation apparatus characterized by comprising a data reading means. 8. The navigation device according to claim 7, wherein the voice recognition unit is provided with input instruction means for enabling or disabling an input operation of the voice signal of the voice signal input means, The noise level is stored in the storage means when the instruction invalidates the input operation of the voice signal, and the noise level is stored in the storage means when the instruction of the input instruction means validates the input operation of the voice signal. A navigation device, characterized in that the noise level and the audio signal level are compared. 9. The navigation device according to claim 7, wherein the storage unit for storing the noise level of the voice recognition unit rewrites and stores the noise level every predetermined period. Navigation device.