JP2006039447A - Voice input device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a voice input device, in which a filter is applied to suppress noise components included in an inputted voice signal, with load saving and cost saving. <P>SOLUTION: The voice input device comprises a sound input section 101, a sound environment monitor section 102 which monitors sound environment from the input sound inputted from the sound input section 101, a filter selecting means 1051 of deciding a standard filter matching the sound environment as the contents of a filter section 106 when the standard filter can be decided based upon information obtained from the sound environment monitor section 102, a temporary filter generating means 1052 which generates a temporarily filter as the contents of the filter section 106 when such a standard filter can not be determined, and a temporary storage section 104 which stores the temporary filter. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a voice input device.

  2. Description of the Related Art In recent years, automobiles have been provided with a voice recognition device so that operation inputs such as navigation devices, audio devices, and air conditioners can be performed by voice. In addition, in order to use the telephone while operating the vehicle in the passenger compartment, a telephone with a hands-free telephone device is also provided. Such a device includes a microphone that captures a voice signal, and is configured to input and process a user's voice.

  However, the microphones are not only sound signals but also noises such as operating sounds of vehicle engines and air conditioners, wind noises generated by running, road noises, air conditioner winds in vehicle interiors, and audio device sounds. Therefore, it is necessary to reduce the noise component from the voice input signal in order to improve the accuracy of voice recognition and the clarity of the call voice.

“Basics of blind sound source separation using array signal processing” Technica1 report of IEICE, EA2001-7. “Analysis of speech features in human speech-like noise”, Journal of the Acoustical Society of Japan, 1997, 53, 5, 337-345.

  Several filtering methods for reducing noise components included in input sound have been proposed.

  For example, a voice microphone installed at a position where the user's voice can be recorded and a noise microphone installed at a position where the same noise as the noise mixed in the voice can be observed. There is a technique for acquiring a signal and adaptively generating a filter that suppresses noise based on both signals. As a method (adaptive algorithm) for adaptively calculating and generating a filter, for example, there is an LMS (Least Mean Square) method. According to this method, a filter for suppressing noise components is adaptively generated, but there is a problem that sufficient noise suppression performance cannot be obtained. In addition, since a microphone for inputting only noise is required, there is a problem in terms of system cost and miniaturization.

  Also, a technique called BSS (Blind Source Separation) is known as a technique for identifying, separating and extracting a source signal using only an observed signal using a microphone array composed of a plurality of microphones. (See Non-Patent Document 1 above).

  However, this method has a problem that the amount of calculation is large, and the load is large when used in combination with a device that requires real-time processing, such as voice recognition processing and a hands-free telephone device.

  When considering the noise environment of the vehicle, there are many situations where the vehicle is traveling at a constant speed and the air conditioner is operating at the same air volume for a certain period of time. Under this situation, there is a noise component. It is thought that it is displaced within the range. Further, when considering the user voice, the number of users of a specific vehicle is often limited to about several people, and therefore the voice component is also considered to be displaced within a specific range. Therefore, it is configured to apply a pre-generated filter to the expected noise and voice, and the same performance is ensured by adaptively updating the filter only when necessary based on the judgment of various vehicle interior sound environments. I think it is possible.

  The present technique has been made in view of the above problems, and an object of the present invention is to reduce the load and cost of an audio input device that applies a filter so as to suppress a noise component included in an input audio signal. It is to be realized with.

  Based on the sound input unit, the sound environment monitoring unit that monitors the sound environment from the input sound input from the sound input unit, and the information obtained from the sound environment monitoring unit, a standard filter that matches the sound environment is determined. If possible, a filter selection unit that uses the standard filter as the content of the filter unit; if such a standard filter cannot be determined, a temporary filter generation unit that generates a temporary filter and sets the content of the filter unit; A voice input device having a temporary storage unit that stores the temporary filter as a component is configured.

  When the standard filter suitable for the sound environment can be determined by the implementation of the present invention, the standard filter is set as the content of the filter unit. When such a standard filter cannot be determined, a temporary filter is generated to generate the filter unit. Therefore, it is possible to realize a voice input device that applies a filter so as to suppress a noise component contained in an input voice signal with reduced load and cost.

  The best mode for carrying out the present invention will be described below by way of an embodiment.

[First Embodiment]
This embodiment is a basic embodiment of the present invention.

  FIG. 1 shows a basic configuration example. In FIG. 1, an arrow (a) indicates an input signal, and an arrow (b) indicates an output signal.

  As shown in FIG. 1, the present embodiment includes a sound input unit 101, a sound environment monitoring unit 102, a standard storage unit 103, a temporary storage unit 104, a filter control unit 105, and a filter unit 106.

  The sound input unit 101 has one or more sound input means for acquiring a sound signal, the filter unit 106 removes noise components from the input sound acquired from the sound input unit 101, and the sound environment monitoring unit 102 Voice section judging means 1021 for judging a voice section and a non-speech section from, noise component monitoring means 1022 for monitoring and acquiring noise component information, and target signal monitoring means 1023 for monitoring and acquiring target signal information. The standard storage unit 103 stores at least one standard sound environment and a standard filter corresponding to the standard sound environment, and the filter control unit 105 determines the sound environment based on the information obtained from the sound environment monitoring unit 102. Filter selection means 1051 that determines the standard sound environment stored in the standard storage unit 103, and selects the standard filter corresponding to the standard sound environment to be the content of the filter unit 106, and the sound environment Suitable standard sound environment can be determined When there is no temporary filter, the temporary storage unit 1042 includes a temporary filter generation unit 1052 that generates a temporary filter and sets the content of the filter unit 106. The temporary storage unit 104 stores the temporary filter.

  The information obtained from the sound environment monitoring unit 102 includes, for example, information obtained from the sound input to the sound input means, information about the vehicle speed, information about the operation of the air conditioner, information about opening and closing of the window, information about the position of the seat , Information on the occupant, information on the vehicle main body, sensors installed inside and outside the vehicle, information obtained by the camera, information on the tire, information on the operation target device installed in the vehicle interior, and the like.

  If necessary, the temporary storage unit 104 stores the sound signal as the target signal when the noise component in the sound signal acquired from the sound input unit 101 can be ignored with respect to the target signal, and performs filter control. The unit 105 generates a pseudo-observation signal generated using the target signal 0 stored at the time t0 before the time t1 and the noise component observed at the time t1, as necessary, with a temporary filter at the time t1. And the target signal 0.

  With the above configuration, a filter suitable for the observed current sound environment can be obtained, and an audio signal in which noise is appropriately suppressed can be obtained. In addition, even when the multi-purpose signal and the observation signal cannot be obtained simultaneously, the sound environment can be reproduced in a pseudo manner, and the pseudo signal suitable for the speaker to be used can be generated. And an audio signal with appropriately suppressed noise can be obtained.

<Basic functions and implementation methods>
The basic functions and specific implementation means of each part will be described with reference to FIG.

  The sound input unit 101 inputs a user's voice and noise generated in the vehicle (arrow (a) in FIG. 1). For example, a microphone (201 in FIG. 2) and an AD conversion unit (202 in FIG. 2). It is realized by combining. In this embodiment, the case where one or more microphones are provided will be described, but the realization means is not limited to this.

The sound environment monitoring unit 102 is a voice segment determination unit 1021 for detecting a voice segment in the input sound obtained from the sound input unit 101;
Noise component monitoring means 1022 for monitoring information on noise;
Objective signal monitoring means 1023 for monitoring information related to voice;
Consisting of
This is used to determine the current sound environment in the passenger compartment, and is realized by combining an arithmetic device (203 in FIG. 2) and a storage device (204 in FIG. 2).

  The standard storage unit 103 is a standard noise component information and standard target signal information that are information related to a noise component and a target signal that are assumed in advance in the vehicle interior, and a standard that is a filter that suppresses noise in a sound environment defined by the information. The filter is stored, and is realized by combining a storage device (204 in FIG. 2). In this way, the standard storage unit 103 performs standard noise component information including information regarding noise components, standard target signal information including information regarding target signals, and sound defined by the standard noise component information and standard target signal information. A voice input device that holds at least one set including at least one of standard filters that suppress noise under an environment can be configured.

  The temporary storage unit 104 stores the temporary filter generated by the temporary filter generation unit 1052 of the filter control unit 105, which will be described later, together with the temporary sound environment information at the time of generation of the temporary filter. 204). In this way, the temporary storage unit 104 stores at least one of the temporary filter created by the filter control unit 105 and the noise component information and target signal information that the filter control unit 105 referred to when creating the filter. An input device can be configured.

The filter control unit 105 determines the standard sound environment stored in the compatible standard storage unit 103 for the information obtained from the sound environment monitoring unit 102, and selects a standard filter corresponding to the standard sound environment Means 1051;
Temporary filter generating means for newly generating a filter suitable for the current sound environment as a temporary filter when the standard sound environment stored in the standard storage unit 103 does not match the information obtained from the sound environment monitoring unit 102 1052 and
It is realized by combining an arithmetic unit (203 in FIG. 2) and a storage unit (204 in FIG. 2).

  The filter unit 106 applies a filter selected or generated by the filter control unit 105 to perform noise suppression processing on the input speech when the speech segment determination unit 1021 of the sound environment monitoring unit 102 detects a speech segment. It is realized by combining an arithmetic device (203 in FIG. 2) and a storage device (204 in FIG. 2).

<More specific explanation of each part>
A more specific configuration of each configuration described above will be described.

(Sound Environment Monitoring Department)
The voice section determination unit 1021 of the sound environment monitoring unit 102 is used in the input sound by using, for example, a method of observing the power spectrum of the input sound or a method of matching time series data of pitch frequency and spectrum envelope information. A function of detecting that the voice of the speaker is included and extracting a section (speech section) including the voice is provided. Furthermore, a method for determining the voice start position by adding a PTT (Push to talk) switch means (not shown), and monitoring the movement of the passenger's mouth using the imaging means, the presence or absence of voice, the voice section, It is also possible to take a method for determining whether or not the speaker is a user.

The noise component monitoring means 1022 of the sound environment monitoring unit 102 monitors information regarding the noise of the speaker in the vehicle interior. Examples of the monitoring information include noise components obtained from the sound input unit 101, Sensing information of various sensors provided in the vehicle, switch operation information, occupant imaging information of a vehicle interior camera, vehicle periphery imaging information of an exterior camera, and the like.
-Noise environment judgment from noise components and other sensing information-
As specific monitoring information, for example,
・ Speaker voice other than the speaker used ・ Vehicle body information (engine type, body shape, vehicle interior capacity, tire type, etc.)
・ Vehicle speed ・ Air conditioner operation ・ Opening and closing of windows ・ Seat position ・ Crew (sitting position and movement, etc.)
・ Weather, road surface condition, road surface type, etc. can be considered. Here, with respect to the noise component, it is preferable to extract and monitor the input sound in the section in which the speech section determination unit 1021 determines that the voice of the speaker used is not detected as noise.

In this embodiment,
1. Vehicle speed classification, 2. 2. Air conditioner level; Information on window opening / closing is monitored and extracted as noise component information. However, this is based on the premise that the standard noise component 103, which will be described later, stores standard noise components as classifications of 1, 2, and 3 data sets.

  Further, the noise component monitoring unit 1022 acquires the actual data of the acquired noise component as the current noise component (necessary when generating the primary filter). However, in the second embodiment to be described later, it is assumed that the noise component monitoring unit 1022 extracts a noise component and the standard storage unit 103 is assumed to be stored as a classification of the noise component itself.

The target signal monitoring means 1023 of the sound environment monitoring unit 102 monitors information related to the voice of the device use speaker in the vehicle interior, and the information is provided, for example, in the user's audio signal or outside the vehicle interior. Extracted from a combination of sensing information of various sensors, switch operation information, and occupant imaging information of a vehicle interior camera. As specific contents of monitoring information, for example,
・ Information on the voice quality of the speaker voice based on the input voice ・ Information on the voice quality of the speaker voice based on the speaker identification can be considered. By the way, the former is to extract voice quality information based on the input speech itself, and the latter is to store the user voice quality and user identification information (video etc.) in correspondence with each other, and the voice quality information based on the user identification result Means to extract. As voice quality information, for example, cepstrum, delta cepstrum, voice power, fundamental frequency, intonation and the like can be analyzed and determined. However, it is preferable that the input sound in the section in which the speech section determination unit 1021 determines that the voice of the speaker in use is detected be processed. In this case, the previous monitoring result is continued for a period in which the voice of the speaker in use is not detected. In the present embodiment, it is assumed that information indicating whether the voice quality is close to men or the voice quality corresponding to women, that is, gender information, is extracted by the analysis process. However, this is based on the premise that a standard purpose signal is stored as a male / female classification in the standard storage unit 103 described later.

(Standard memory)
The standard storage unit 103 has information on noise components collected by the noise component monitoring unit 1022 of the sound environment monitoring unit 102. 1. Standard noise component information and information regarding the target signal collected by the target signal monitoring means 1023 2. A standard filter that can efficiently suppress noise under a sound environment defined by standard target signal information, the standard noise component information, and the standard target signal information. A standard filter is stored in advance. Each data is preferably stored in a plurality of sets according to the assumed sound environment, and the assumed sound environment is selected from those that occur frequently depending on the usage form of the vehicle.

  The derivation of each information of 1.2.3 is specifically described below.

1. Standard noise component information The standard signal information is stored beforehand in the noise component information extracted by the noise component monitoring means 1022, which is expected to have a high detection frequency. A large number are collected, cluster analysis is performed based on the components of the noise component, and the noise is classified into a predetermined number of groups, and a plurality of representative (center of gravity) noises are derived. At this time,
By classifying vehicle signals such as vehicle speed classification, air conditioner level, and window opening / closing information in association with each other, the classification of noise components can be replaced with the classification of the vehicle signals (the second embodiment if not replaced).
For example, the derived classification is as follows.

Noise classification Vehicle speed classification Air conditioner level Window opening / closing information
N1: Hourly speed = 0-10km Air conditioner level = OFF Window fully closed
N2: Hourly speed = 10-30km Air conditioner level = 1
Standard noise component information such as window full closure is determined as standard noise information corresponding to noise information that is expected to have a high detection frequency based on the obtained information and the capacity of the standard storage unit 103.

  In the present embodiment, it is assumed that a plurality of cases of full closure are selected for the window opening / closing information, and that the noise when any of the windows is vacant is not selected because of its low frequency. Therefore, since a filter with a vacant window is not prepared, a temporary filter is used.

2. Standard Objective Signal Information The standard objective signal information is a plurality of objective signal information corresponding to the objective signal information extracted by the objective signal monitoring means 1023.
As in the derivation of noise component information, the derivation process collects a plurality of target signals, classifies them into a plurality based on the signal characteristics (= voice quality), and sets a representative target signal as a standard target signal. Here, it was decided to classify into two types, male voice and female voice.

  For example, the derived classification is as follows.

Target signal classification Gender
V0: Male Female (General)
V1: Male
V2: Female Of course, it is also possible to record a variety of voices, and perform cluster analysis based on cepstrum, delta cepstrum, voice power, fundamental frequency, intonation, etc., and further classify and store them.

  Note that V0 in the example is prepared as standard voice information used temporarily until the target signal monitoring unit 1023 determines whether the voice quality of the speaker used belongs to male or female. The filter selection means 1051, which will be described later, determines that the voice belongs to V0 before the speaker voice is detected or when the voice quality cannot be determined from the detected voice because the noise is large.

  In addition, the standard purpose signal information of the present embodiment is configured to simultaneously store the actual data of the audio signal for each of the above classifications. This is data necessary for generating a target signal and a pseudo-observation signal in a temporary filter generation unit to be described later. This is used when the target signal and the observation signal cannot be obtained simultaneously, such as in the case of a configuration using a one-channel microphone. Accordingly, the actual data is not essential in the case where the observation signal of the target signal can be acquired simultaneously.

  The actual audio data is preferably data having the characteristics of each classification (V0: male female, V1: male, V2 female) on average. Specifically, it may be possible to generate an audio signal obtained by averaging the sounds belonging to each category. This signal is also referred to as HSLN (Human Speech Like Noise), and its characteristics are detailed in Non-Patent Document 2.

  Hereinafter, the actual data of the audio signal is referred to as a standard target signal.

Based on the above, the standard purpose signal information is
Target signal classification Gender Standard target signal
V0: Male Female (General) Male Female Average Voice (HSLN) (V ₀ )
V1: Male Male average voice (V ₁ )
V2: Female Female average voice (V ₂ )
It becomes.

3. Standard filter The standard filter is a filter that suppresses a noise component and emphasizes a target signal in a sound environment in a vehicle cabin defined by a combination of the standard noise component information and the standard target signal information. Uses the actual noise component data of each category when standard noise information is selected and the standard target signal of the standard target signal information to simulate the vehicle interior sound environment and adapts the filter to suppress noise in that environment To generate.

  Therefore, the standard filter generates and stores a combination of the selected standard noise component information type and the standard target signal information type.

(Standard filter generation procedure example)
An example of the standard filter generation process will be described with reference to the block diagram 3. Note that this example is an example when the system is a one-channel microphone configuration system, but in the case of a plurality of channels, a standard filter suitable for the sound environment can be generated by the BSS method or the like (described later). (Refer to the third embodiment).

  First, as shown in FIG. 3, various voice signals assumed as standard voice information, that is, the above-mentioned standard target signal (a in FIG. 3) and noise actual data (here, standard) corresponding to the noise environment selected as standard noise information. (Noted as noise information) (b in FIG. 3) is prepared.

  The standard target signal (a) is input as the target signal d (k) (k: time), and the signal obtained by adding the standard target signal (a) and the standard noise component (b) by the adder 401 is a pseudo-observation signal. Generate and input as x (k). Adaptive processing is performed using these two signals. In the adaptive processing, an error signal e (k) is generated from the output signal y (k) obtained by filtering the input signal x (k) with the filter W (k) and the target signal d (x) (adder 403), The filter coefficient is automatically updated so that the error signal e (k) becomes small. As an adaptive processing algorithm, an LMS (least mean square) method, an RLS (recursive least square) method, or the like can be used. As a result, a noise suppression filter corresponding to various sound environments is generated.

(Storage example of the standard storage unit)
A storage example of the standard storage unit 103 is shown in FIG.

Standard noise information is Nx (x = 1,2,3, ...), standard target signal information is Vy (y = 0,1,2, ...), standard filter Fxy (x, y are standard noise information) And standard audio information). With this configuration, the filter control unit 105 described later can refer to the standard filter based on the monitoring results of the noise component monitoring unit 1022 and the target signal monitoring unit 1023. (Filter control unit)
The filter control unit 105 performs filter selection processing and temporary filter generation processing based on the current sound environment information obtained from the sound environment monitoring unit 102 and the standard sound environment information in the standard storage unit 103.

<Operation: Flowchart>
Specific configurations and processes of the filter control unit 105 and the temporary storage unit 104 will be described with reference to the flowchart of FIG.

  In step S1001, the current noise component information and target signal information are acquired from the sound environment monitoring unit 102.

For example, consider the case where the following two types of current sound environment monitoring results are obtained.
Example a)
Noise component information:
Noise component = Noise (Na), vehicle speed classification = 10-30km / h, air conditioner level = 1, window = fully closed purpose signal information: male example b)
Noise component information:
Noise component = Noise (Nb), Vehicle speed classification = 10-30km / h, Air conditioner level = 1, Window = Driver's seat window opening purpose signal information: Female Note that strictly speaking, when using a 1-channel microphone Since it is difficult to obtain the target signal and noise component at the same time, the information extracted in the section judged as the speech section by the previous speech section judgment means is the target signal information, and the information extracted in the section judged as the non-speech section Is the current noise component.

  In step S1002, the standard storage unit 103 is referenced to obtain standard noise component information and standard target signal information. For example, it is assumed that the standard storage unit 103 stores information on the contents shown in FIG.

In step S1003, current noise component information and standard noise component information are collated, and current target signal information and standard target signal information are collated. Depending on the collation result, a standard filter is selected or temporary filter generation processing is performed. To decide. For the example shown above,
In the case of example a), standard noise component information = N5 (vehicle speed classification: 10-30km / h, air conditioner level: 1, window: fully closed)
And standard purpose signal information = V1 (male)
Is suitable. Therefore, it is determined that there is a sound environment compatible with the standard storage unit 103, and the process proceeds to step S1004.

on the other hand,
In the case of example b), standard noise component information = not applicable (the filter for opening the driver's seat window is not prepared for the standard filter)
Standard purpose signal information = V2 (female)
Result is obtained. Therefore, it is determined that there is no sound environment suitable for the standard storage unit 103, and the process proceeds to step S1005.

In step S1004, a standard filter corresponding to the sound environment that matches as a result of the collation is referred from the standard storage unit 103, and this is applied as a filter corresponding to the current sound environment. That is, in the case of example a) above,
Since it is determined that the standard noise component information = N5 and the standard target signal information = V1, the standard filter = F51 corresponding to this is selected from the standard storage unit 103.

In step S1005, the current voice and the standard voice signal corresponding to the compatible standard voice information stored in the standard storage unit 103 are referred to, and a temporary filter is generated by adaptive processing. That is, in the case of the above example b), a temporary filter (in this case, F _t b2 is described) using the current noise component information (Nb) and the standard target signal information = female average speech (HSLN) held in V2. ) Is generated.

(Temporary filter generation procedure for 1-channel adaptive filter)
A configuration example and operation of the temporary filter generation means 1052 at this time will be described with reference to FIG.

  First, the standard audio signal (a) is acquired from the standard storage unit 103 and set as the target signal d (k).

  On the other hand, the current noise component (b) is acquired from the sound input unit 101, and the standard sound (a) added thereto is set as a pseudo-observation signal x (k). A temporary filter Ft (k) is obtained by adaptive processing using the target signal and the input signal. Details of the adaptation processing are as described above.

  In step S1006, the generated temporary filter is stored in the temporary storage unit 104 together with, for example, standard voice information and current noise information at the time of generation. The arrows (a), (c), and (d) in the block diagram of FIG. 5 correspond to the information flow stored. That is, in the case of example b), the generated temporary filter Ft and the noise component information Nb at the time of generation (vehicle speed division = 10-30 km / h, air conditioner level = 1, window = driver's seat window: open) and generation Standard purpose signal information V2 (gender = female, standard purpose signal female average speech (female HSLN)) is stored.

  An example of storage in the temporary storage unit 104 is shown in FIG.

  Here, since the temporary audio information is exactly the same data as the corresponding standard noise information in the standard storage unit 103, in addition to generating and storing a duplicate, the address value or the like of the data may be held.

(The initial value at the time of temporary filter generation is used from the most similar filter)
In the temporary filter generation in step S1005, it is preferable to select the filter having the most similar sound environment as the filter initial value for the adaptive processing.
That is, in the case of the above example b), the filter F51 in the case of standard noise = N5 and standard speech = V2 is determined as the most similar filter, and this filter is given as an initial value. As a result, the number of adaptive processes required for the update can be reduced, and the processing load can be reduced.

  In this way, the filter selection means 1051 is a standard close to the noise component information and the target signal information when there is no information in the standard storage unit 103 that matches the noise component information and the target signal information acquired by the sound environment monitoring unit 102. Determine noise component information and standard target signal information, refer to the standard filter corresponding to the standard noise component information and standard target signal information, and the temporary filter generation means 1052 supports the current sound environment with the standard filter as an initial value. A noise suppression filter to be generated can be generated and used as a temporary filter.

(Temporary filter also performs filter selection in addition to the subsequent verification processing)
In addition, when a temporary filter is once generated and stored by the above processing, it is preferable to perform filter selection while referring to both the standard storage unit 103 and the temporary storage unit 104 in the subsequent processing of the filter control unit 105. That is, when the noise component information and the target signal information obtained in the sound environment monitoring unit 102 match the temporary noise component information and the standard target signal information stored in the temporary storage unit 104, the temporary filter is selected. In addition to the standard filter, the temporary filter is also added to the selection candidate, so that the temporary filter is selected over a period in which the sound environment (noise and voice) corresponding to the temporary filter is continuously detected.

  The filter unit 106 performs a filtering process using the standard filter and the temporary filter selected or generated by the filter control unit 105 when the voice section determination unit of the sound environment monitoring unit 102 detects a voice. The voice signal filtered by the filter unit 106 is sent to, for example, a voice recognition device or a hands-free telephone (arrow (b) in FIG. 1).

(About processing timing)
For example, the following three processing timings of the sound environment monitoring unit 102 and the filter control unit 105 described above are conceivable.

  (1) Regardless of the presence or absence of voice detection, the sound environment is monitored constantly or at predetermined intervals, and a standard filter is selected and a temporary filter is generated.

  (2) Regardless of the presence or absence of voice detection, the sound environment is monitored constantly or at predetermined intervals, and the standard filter is selected. However, the temporary filter is generated only at the time of voice detection.

  (3) Sound environment monitoring, standard filter selection, and temporary filter generation are all performed only during voice detection.

  An example of processing timing in the case of (1) is shown in FIG.

Figure 7 shows an example of filter application over time, with the horizontal axis representing the time and the vertical axis
(A) Target signal information (To be precise, it shows the standard signal information (one of V0, V1, V2) that has been matched after the current target signal information and the standard target signal information are verified)
(B) Noise difference (curve) and threshold (dotted line)
(C) Noise component information (To be precise, when comparing current noise component information and standard noise component information, the standard noise component information (N1, N2,... (Indicates information (Na, Nb, etc.))
(D) Temporary filter generation / application interval
(E) Shows the final applied filter. The time at each timing is indicated as Tx (x = 0, 1, ...), the standard filter is indicated as F (x, y) (x: standard noise component information, y: standard target signal information), and a temporary filter Is expressed as Ft (z, y) (z: temporary noise component information, y: standard target signal information).
Incidentally, the noise component information of (C), when corresponding standard noise component information exists, at the standard noise component information system start time T0, from the target signal monitoring means 1023 to the standard target signal information V1, noise component monitoring means Standard noise component information N1 is obtained as a monitoring result from 1022, and the standard filter F (1,1) is selected.

  The utterance Va1 by the speaker A is detected in the section T1 to T2. At this time, a monitoring result is obtained that the standard target signal information corresponding to the speaker voice is V1 and the standard noise component information for the current noise is N1, but this is not changed from the section before the speech (T0 to T1). Therefore, the filtering process is performed using the already selected standard filter F (1,1).

  In the section T3 to T4, it is determined that there is no standard noise component information corresponding to the current noise, and based on the temporary noise Na and the standard target signal information V1, a temporary filter Ft (a, 1) is adaptively generated, Applied. However, since there is actually no utterance in this section, this temporary filter is not used.

  In the section from T4 to T7, the standard noise component information corresponding to the noise component is determined as N4, and the standard filter F (4, 1) is selected. The utterance Va2 by the speaker A is detected in T5 to T6 in this section. Since the standard filter corresponding to the sound environment has already been selected, the filtering process is performed using this standard filter.

  In the sections T7 to T8, the utterance Vb1 by the speaker B is detected, and the standard target signal information is determined to be V2 as the target signal monitoring result. On the other hand, the standard noise component information is continuously determined as N4 as the standard miscellaneous signal sound monitoring result. Therefore, the standard filter F (4, 2) corresponding to V2 and N4 is selected, and filtering processing is performed on the speech voice Vb1. This filter continues to be held until T9 when the sound environment changes.

  In sections T9 to T12, it is determined that the standard noise component information corresponding to the current noise component information does not exist, and based on the temporary noise Nb and the standard target signal information V2 at this time, the temporary filter Ft (b, 2) Generated and applied. The utterance Vb2 is detected in T10 to T11 in this section, but since the corresponding filter has already been generated as the temporary filter Ft (b, 2) (at the time of T9), the voice Vb2 is used using this filter. Filtering process is performed for.

  An example of processing timing in the case of (2) is shown in FIG.

  In this case, since the sound environment monitoring process and the filter selection process are always performed or at predetermined intervals as in (1), the filter is changed with a change in the noise environment. Noise Na that does not correspond to the standard filter is detected in the sections T3 to T4. However, since no voice is detected in this section, the generation of the temporary filter is not performed, and the selection of the standard filter F (1,1) that has been selected is continued. Similarly, noise Nb that does not correspond to the standard filter is detected at time T9, but since no voice is detected at this time, the standard filter F (4, 2) is continuously selected. Then, when the sound is detected at time T10, the temporary filter Ft (b, 2) is generated and applied.

  An example of processing timing in the case of (3) is shown in FIG. For comparison with (1) and (2), real-time speech information and noise information are supplemented immediately below each.

  In this case, the matching process, the filter selection process, and the temporary filter generation process are all performed at the time of voice detection. That is, processing is performed at times T1, T5, T7, and T10. If the sound environment has not changed before that time (= if the standard filter corresponding to the current sound environment has already been selected), the selection is continued (eg, sections T1 to T5). On the other hand, if there is a change in the current sound environment, a new standard filter is selected (eg, sections T5 to T7, T7 to T10). Further, if it is determined that the standard sound environment information suitable for the current sound environment is not present in the standard storage unit 103, a temporary filter is generated and applied (eg, after section T10).

  Through the series of processes described above, the filter control unit can reduce the filter calculation process because an appropriate filter is selected when there is a filter that can cope with the observed noise. Furthermore, even when there is no corresponding filter, a filter suitable for the sound environment can be temporarily generated and applied, so that the noise suppression effect can be maintained.

[Second Embodiment]
This embodiment shares the same basic configuration as the first embodiment. In the first embodiment, the noise component monitoring means 1022 of the sound environment monitoring unit 102 extracts noise component information as information combining information other than the input sound (vehicle speed classification, air conditioner level, window opening / closing information), and the standard storage unit 103. However, in this embodiment, a case where noise component information is extracted using the input noise component itself will be described.

  Since the basic configuration is common, only the features of this embodiment will be described below.

(Sound Environment Monitoring Department)
The noise component monitoring unit 1022 of the sound environment monitoring unit 102 monitors information regarding the noise of the speaker in the vehicle interior. In this embodiment, the noise component monitoring unit 1022 monitors using the noise component itself.

Therefore, the information to be extracted is
-The noise component itself or its spectral information.
However, in this case, it is preferable to cooperate with the voice section determination unit 1021 and regard information other than the section that the voice section determination unit 1021 determines to be speech as noise.

-Standard storage section-
In the standard storage unit 103,
1. Standard noise component information and
2. Standard purpose signal information and
3. The standard filter is stored in advance.

1. Standard noise component information The standard noise information is information that is likely to be detected by a vehicle among information on noise components monitored by the noise component monitoring unit 1022. Here, the noise component data based on the assumed noise environment or the spectrum of the noise component is used. In the present embodiment, actual noise component data is stored, and hereinafter, the signal is described as a standard noise component.

(About creation of standard noise data)
In order to determine and acquire the noise components based on the assumed noise environment, for example, the noise components based on the various noise conditions assumed in the passenger compartment are actually recorded, and multiple groups based on the spectrum and feature vector of each signal Take a technique such as classifying. For example, cluster analysis is preferable. After classification, representative noise for each group is determined and used as standard noise component information. At this time, the representative noise is preferably a signal that holds an average spectrum of the classified noise. Also, the number of classifications at this time is determined based on the number of possible fills to be held, that is, the memory capacity.

  FIG. 11 schematically shows an example in which noise is classified into four types. Innumerable points in the figure are examples in which feature vectors of observed signals are plotted on a vector space. This data is classified into four types, and noise components as representative points are defined as standard noise components N1, N2, N3, and N4, which are used as standard noise component information.

2. Standard purpose signal information As in the first embodiment, information on voice quality and an average voice signal for each voice quality are stored.
Example) ID: Gender information Standard purpose signal
V0: Male female, male female average voice signal
V1: Average audio signal for males and males
V2: Female, average audio signal of female Standard filter The standard filter is given as an adaptively generated filter that suppresses noise and emphasizes speech in a sound environment in a vehicle cabin composed of a combination of the standard noise information and standard speech information.

  The generation method is the same as in the first embodiment.

  A storage example of the standard storage unit 103 that stores the above three types of standard data is shown in FIG. Standard noise information is Nx (x = 1,2,3, ...), standard audio information is Vy (y = 0,1,2, ...), and standard filter Fxy (x, y are standard) Noise information and standard audio information). With this configuration, it is possible to refer to the standard filter from the monitoring results of the noise component monitoring unit 1022 and the target signal monitoring unit 1023.

(Filter control unit)
The filter control unit 105 selects a standard filter from the standard storage unit 103 based on the current sound environment information obtained from the sound environment monitoring unit 102 and the standard sound environment information in the standard storage unit 103 (filter selection means 1051 And a process of generating a temporary filter (by the temporary filter generating means 1052) when there is no standard filter corresponding to the current sound environment.

  First, the filter selection means 1051 compares the difference between the current noise component information, that is, the noise component or its spectrum information, and the same information in the standard storage unit 103, and the one with the smallest difference is most similar to the current noise component. Select as signal.

  On the other hand, standard target signal information corresponding to the current target signal information is determined by the same method as in the first embodiment.

(Meaning of “difference” and calculation example)
The above-mentioned “difference” is an index for judging the similarity of signals. As a calculation example, a power spectrum coefficient that is an acoustic feature of a sound signal, a linear prediction coefficient, power for each frequency, etc. are vectorized. Using series data,
・ It can be calculated from the distance between vectors and the cosine value of the angle between vectors.

  Subsequently, whether or not a temporary filter is generated is determined by paying attention to the difference between the current noise component information and the standard noise component information.

  That is, if the difference does not exceed a predetermined “threshold” with respect to the standard noise obtained by the above-described method, the filter selection unit selects a standard filter based on the most similar sound environment. . On the other hand, if the threshold value is exceeded, it is determined that there is no standard filter corresponding to the filter selection unit, and the temporary filter generation unit 1052 generates a temporary filter.

(Threshold)
Here, the threshold is a value that determines how far the difference between the current noise and the reference noise is allowed, that is, how much similar noise is processed by the existing standard filter, and the existing filter has sufficient noise. It is desirable that the range for maintaining the suppression performance is obtained by experimentation and applied.

(Filter selection, temporary filter generation (supplement))
Determination of whether or not a temporary filter is generated will be specifically described with reference to FIGS.

  FIG. 13 shows a threshold given to the standard noise classification shown in FIG. A curve surrounding the periphery corresponds to the threshold value. In this example, the threshold is uniformly set as Th. Assume that noise is currently observed as Na in FIG. At this time, the standard noise that minimizes the difference from Na is N4, and the difference is Da.

Since the difference Da at this time is Th> Da and is within the threshold range, the standard filter F ₄₁ corresponding to the standard noise component information N4 and the standard target signal information (for example, V1) is obtained from the standard storage unit 103 by the filter selection means 1051. Selected and applied as a filter corresponding to the current sound environment.

  On the other hand, it is assumed that the current noise is observed at Nb as in the example of FIG. At this time, the difference is Db, and the standard noise that minimizes the difference is N4, but Db <Th. That is, since the difference exceeds the threshold, it is determined that there is no standard filter corresponding to the current noise.

  Therefore, the process proceeds to a temporary filter generation process by the temporary filter generation unit 1052. That is, the filter Ft is generated by adaptive processing using the standard target signal information (for example, V1) and the current noise component information Nb.

(The initial value at the time of temporary filter generation is used from the most similar filter)
When generating a temporary filter, it is preferable to select a filter having the most similar sound environment as a filter initial value for adaptive processing.

That is, in the case of the above example, the standard filter F41 corresponding to standard noise component information = N ₄ and standard target signal information = V ₁ is determined as the most similar filter, and this filter is given as an initial value. As a result, the number of adaptive processes required for the update can be reduced, and the processing load can be reduced.

  The movement of changing the filter according to the noise difference is shown in FIG.

Fig. 15 shows an example of filter application over time, with the horizontal axis representing time and the vertical axis.
(A) Target signal information (To be precise, the current target signal information is matched with the standard target signal information and the standard target signal information (V0, V1, or V2) that has been matched is shown)
(B) Noise difference (curve) and threshold (dotted line)
(C) Noise component information (To be precise, when comparing current noise component information and standard noise component information, the standard noise component information (N1, N2,... (Indicates information (Na, Nb, etc.))
(D) Temporary filter generation / application interval
(E) Shows the final filter application result.

  The time at each timing is indicated as Tx (x = 0, 1, ...), the standard filter is indicated as F (x, y) (x: standard noise component information, y: standard target signal information), and a temporary filter Is expressed as Ft (z, y) (z: temporary noise component information, y: standard target signal information).

  The curve representing the difference (B) in FIG. 15 shows the difference between the most similar standard noise component selected by the noise component monitoring means 1022 and the current noise component. According to the figure, this difference exceeds the threshold from time T1 to T2 and T4 to T5, and noise component information at that time is detected as Nb and Nc, respectively. Therefore, temporary filters Ft (b, 1) and Ft (c, 2) are generated based on the respective noise component information (Nb, Nc) and the standard target signal information (V1 and V2) that match in the section. The In other sections, a standard filter based on the most similar standard target signal information and standard noise component information is selected. That is, in the interval T0 to T1, the standard filter F (1,1) is based on the standard target signal information = V1 and the standard noise component information = N1, and similarly, the F (1,4) in T2 to T4 is the interval T3 to T3. F (2,4) is selected at T4, and F (2,1) is selected at T5 to T6.

  The temporary storage unit 104 stores the generated temporary filter Ft, noise component information at the time of generation (Nb, Nc, etc.), and standard target signal information at the time of generation (V1, V2, etc.).

(Temporary filter also performs filter selection in addition to the subsequent verification processing)
The processing of the filter control unit 105 after the temporary filter is generated and stored in the temporary storage unit 104 is preferably performed with reference to both the standard storage unit 103 and the temporary storage unit 104. That is, the noise component monitoring means 1022 is configured to select the most similar noise for the temporary noise in addition to the standard noise, and when the most similar noise is the temporary noise, the temporary noise is set as a threshold value. By comparing, it is determined whether to generate a new temporary filter or apply an existing temporary filter. The threshold value at this time may be the same as the threshold value applied to the standard noise, or another value may be given.

  FIG. 16 shows a situation in which, when Nb is observed in the example of FIG. 14 described above and the temporary filter Ft is generated, the noise Nb at this time is set as temporary noise, a threshold Th is given, and used for collation. That is, in addition to the standard noises N1 to N4, the temporary noise Nb is also subject to difference calculation with the current noise, so that a period of time during which noise similar to Nb is continuously detected (= Nb within the threshold range) If there is no change in the target signal information (such as the same speaker), the temporary filters (Ft (b, 1), Ft (c, 2)) are continuously selected.

  Through the series of processes described above, the filter control unit can reduce the filter calculation process because an appropriate filter is selected when there is a filter that can cope with the observed noise. Furthermore, when it is determined that the standard filter cannot obtain sufficient noise suppression performance, a filter suitable for the sound environment can be provisionally generated and applied, so that the noise suppression effect can be maintained.

[Third Embodiment]
In the present embodiment, a case will be described in which a microphone array is configured using two or more channels of microphones.

  The basic configuration of this embodiment is the same as that of the first embodiment, and includes a sound input unit 101, a sound environment monitoring unit 102, a standard storage unit 103, a temporary storage unit 104, a filter control unit 105, and a filter unit 106. .

  Each function has the same basic part. Below, the characteristic part of this embodiment is demonstrated.

  The noise component monitoring means 1022 of the sound environment monitoring unit 102 monitors information related to the direction of noise arrival in the vehicle interior. For example, sensing information of various sensors provided inside and outside the vehicle interior, switch operation information, It may be occupant imaging information of an indoor camera. By combining these pieces of information, it is determined from which direction the current noise comes. Alternatively, a method of estimating the direction of arrival of the noise component from the input sound may be taken.

For example,
・ Using the window opening / closing information, let the direction of the open window be the noise component arrival direction.
・ If the airflow level of the air conditioner is greater than or equal to the predetermined level, the direction of the air conditioner outlet will be the noise component arrival direction.
When the wiper is operating, the wiper direction is the noise component arrival direction.
・ When two or more people are on board, a speech collision is detected from the imaging means, and the voice other than a specific person's voice is regarded as noise, and that direction is the noise component arrival direction.
Can be determined.

  For speech collisions, the target speech is determined by always giving priority to the driver's car, giving priority to the speaker who started the speech first, giving priority to the speaker with specific keywords or with specific physical movements. Or, the user may determine the priority speaker in advance.

  The target signal monitoring unit 1023 of the sound environment monitoring unit 102 monitors information related to the direction of arrival of the target speaker voice, which is a target signal in the vehicle interior. Examples of the monitoring information include various types of information provided inside and outside the vehicle interior. Sensor sensing information, switch operation information, vehicle occupant imaging information, and the like. By combining these pieces of information, it is determined from which direction the current input voice comes. Alternatively, a method of estimating the direction of arrival of the target signal from the input sound may be taken.

  For example, from detection of mouth movements by the imaging means, it is determined which of the driver's seat and passenger's seat passenger is inputting voice, and the mouth position is determined as the target signal arrival direction.

  The standard storage unit 103 assumes information obtained as a monitoring result by the target signal monitoring unit 1023 of the sound environment monitoring unit 102. 1. Assume standard audio information and information obtained as a monitoring result by the noise component monitoring means 1022. 2. A sound source separation filter in which the target voice arrival direction is the sound collection direction and the noise arrival direction noise is the suppression direction in the vehicle interior sound environment composed of standard noise information and a combination of the voice environment and the noise environment. A standard filter is stored in advance.

  It is preferable that a plurality of each of the data 1, 2, and 3 is retained.

  It should be noted that the sound source separation filter as a standard filter is the sound signal data obtained by actually reproducing the simulated sound environment as described above, that is, the environment where the target signal and the noise component come from different directions or simulating them on a computer. It is preferable to generate a filter that separates the target signal from the noise component by using a BSS (blind sound source separation) method or the like. Since this filter is generated and stored in advance, it is not necessary to consider generation time. Therefore, a standard filter can be generated as a more precise sound source separation filter.

FIG. 17 shows an example of storage in the standard storage unit 103. According to this example
As standard noise component information, that is, the direction of noise arrival,
N1: Passenger's seat direction, N2: Driver's seat direction, N3: Driver's seat window direction, etc. are assumed. Also,
As standard voice information, that is, the direction of voice arrival,
V1: Driver seat exit direction, V2: Passenger seat exit direction, etc. are assumed.

  Then, the sound source separation filter corresponding to the sound environment based on the standard noise information and the standard sound information is held as F11, F22, F13,.

  In the filter control unit 105, first, in the filter selection unit 1051, noise component information obtained from the noise component monitoring unit 1022 and the target signal monitoring unit 1023, target signal information, and standard noise component information stored in the standard storage unit 103 Then, it is compared with the standard objective signal information and checked to determine whether there is a sound environment having a matching direction of arrival.

  If there is a suitable sound environment, a standard filter corresponding to the sound environment is selected. If there is no sound environment, the process moves to a temporary filter generation process by the temporary filter generation means 1052, and the current noise component information and target signal information are displayed. The sound source separation filter that suppresses the noise component arrival direction and directs the directivity toward the target signal arrival direction is generated.

  As a temporary filter generation method at this time, in addition to the above-described BSS method or the like, beam forming using a delay sum type or adaptive array may be used. Even if an algorithm that can automatically predict and adapt the direction of arrival without giving the direction of arrival of the target signal and noise component, such as BSS, the information on the direction of arrival obtained as the noise component information and the target signal information is used. It is preferable to teach as an initial value a filter to be a beam former. As a result, a filter having directivity or blind spot in the direction of arrival can be generated with stable and less processing.

  The temporary storage unit 104 stores the temporary filter obtained by the temporary filter generation process together with the target signal information and noise component information at the time of generation. As in the first embodiment, once the temporary filter is generated, the temporary filter can be added to the selection candidates, so that the temporary filter can be continuously applied when the same environment continues.

  A specific operation example of the filter control unit 105 will be described with reference to FIGS. The figure shows a situation in which the passenger compartment is viewed from the top of the vehicle, and an elliptical area surrounding the speaker is a sound collection area of the microphone. In this example, the case of using a blind spot control type filter is shown. It is assumed that the standard storage unit 103 stores the standard filter of FIG.

  FIG. 18A shows a case where the utterances of the driver and the passenger seat speaker collide. The target signal monitoring unit 1023 of the sound environment monitoring unit 102 determines that the driver's mouth direction is the target signal arrival direction, and uses this as target signal information. On the other hand, the noise component monitoring means 1022 determines that the direction of the passenger's mouth is the noise component arrival direction, and uses this as noise component information. The target signal information and noise component information are compared with the standard target signal information and standard noise component information in the standard storage unit 103 to determine whether there is a suitable sound environment. In this example, N1 (passenger's seat direction) of the standard noise component information in the standard storage unit 103 and standard objective signal information: V1 (direction of the driver's seat) are adapted to the current sound environment, and as a result, a corresponding standard filter F11 is selected.

  FIG. 18B shows a situation where the driver's seat window is open when the driver speaks. In this case as well, the sound environment monitoring unit 102 determines that the target voice arrival direction is the driver's mouth direction and the noise arrival direction is the driver window direction, and F31 is met as a result of collating the standard filter under the sound environment. Selected. As a result, it is possible to acquire the input sound in which the noise of the passenger on the passenger seat is suppressed.

  On the other hand, FIG. 19 shows a situation in which a speaker generating noise in the passenger seat side rear seat is detected when the driver speaks. The sound environment monitoring unit 102 determines that the target voice arrival direction is the driver mouth direction and the noise arrival direction is the rear center seat occupant mouth direction. However, the temporary storage unit 104 does not have a standard filter corresponding to this sound environment. Therefore, the process moves to the temporary filter generation process in the temporary filter generation means 1052, and the temporary filter Fa1 corresponding to the sound environment is generated and applied. As a result, it is possible to obtain an input sound in which noise from the direction of the speaker in the passenger seat side rear seat is suppressed.

  Through the series of processes described above, the filter control means can select the corresponding filter based on the observed arrival direction of the target voice and the arrival direction of the noise, and therefore can reduce the calculation process of the filter. Furthermore, even when there is no corresponding filter, a filter suitable for the sound environment can be provisionally generated and applied, so that the noise suppression effect can be maintained.

[Fourth Embodiment]
The basic configuration of this embodiment is the same as that of the first embodiment, and includes a sound input unit 101, a sound environment monitoring unit 102, a standard storage unit 103, a temporary storage unit 104, a filter control unit 105, and a filter unit 106. The

  Each component has the same basic portion as that of the first embodiment. Below, the characteristic part of this embodiment is demonstrated.

  The target signal monitoring unit 1023 of the sound environment monitoring unit 102 monitors information related to the voice of the speaker in the vehicle interior. Examples of the monitoring information include a voice signal of the speaker and various types of information provided outside and inside the vehicle interior. Sensor sensing information, switch operation information, vehicle occupant imaging information, and the like. Based on the voice monitoring information, the frequency characteristics of the voice are determined. Further, the target signal monitoring unit 1023 cooperates with the voice segment determination unit 1021 and, when the S / N is determined to be sufficiently large in the segment in which the voice is detected, the target signal monitoring unit 1023 temporarily stores the voice as the temporary target signal Vt. The function of storing in 104 is also provided.

  The temporary objective signal has a high S / N with a standard objective signal (male HSLN, female HSLN, etc.) included in standard objective signal information (V1, V2, etc. in FIG. 4) to which the user's voice belongs as an initial value. It is good also as a structure which adds a user's audio | voice to this standard audio | voice whenever an audio | voice is observed. As a result, as a high S / N user voice is observed, a temporary target signal optimized for the voice feature component of the user is formed.

  Or it is good also as a structure which adds the voice of all the users to the standard purpose signal (V0: man and woman HSLN) etc. which matched man and woman. As a result, a temporary objective signal optimized for a plurality of passengers who perform voice input on the vehicle is formed.

  The filter control unit 105 selects a standard filter from the standard storage unit 103 based on the current sound environment information obtained from the sound environment monitoring unit 102 and the standard sound environment information in the standard storage unit 103 (filter selection means 1051 And a process of generating a temporary filter (by the temporary filter generating means 1052) when there is no standard filter corresponding to the current sound environment.

  The filter control procedure will be described below using the flowchart of FIG.

  In step S2001, the current sound signal detected by the sound input unit 101 is acquired and sent to the sound environment monitoring unit 102.

  In step S2002, the sound environment monitoring unit 102 acquires current target signal information and noise component information.

  In step S2003, the standard noise component information and the standard target signal information are referred to from the standard storage unit 103.

  In step S2004, the current noise component information and the standard noise component information are collated, and the current target signal information and the standard target signal information are collated. That is, standard noise component information and standard target signal information that match or most similar to current noise / voice information are determined.

  In step S2005, branch processing according to the collation result in step S2004 is performed. That is, in step S2004, paying attention to the comparison result of current noise component information and standard noise information, if there is standard noise information that matches or is similar within a predetermined range, the process proceeds to the filter selection process in step S2006. On the other hand, if there is no standard noise component information that does not match or is similar within a predetermined range, the process proceeds to a temporary filter generation process in step S1007.

  In step S2006, a standard filter corresponding to the combination of the standard target signal information and the standard noise information is selected from the standard filters and applied as a filter corresponding to the current sound environment.

  In step S2007, the temporary storage unit 104 is referred to, and whether or not the temporary target signal (that is, the signal obtained by adding the target signal acquired at high S / N to the standard target signal) is stored in the target voice information. judge. If there is temporary audio, the process proceeds to step S2008. On the other hand, if there is no temporary target signal, the process proceeds to step S2009.

  In step S2008, a temporary target signal in the temporary storage unit 104 is set as a target signal, a signal obtained by adding the current noise component and the temporary audio signal is set as a pseudo observation signal, and a temporary filter is generated by adaptive processing.

  In step S2009, the standard noise signal (such as male HSLN and female HSLN in FIG. 4) included in the standard objective signal information that matches the current objective signal information determined in step S2004 is used as the target signal, and the current noise component and the standard A signal obtained by adding the audio signal is used as a pseudo observation signal, and a temporary filter is generated by adaptive processing.

  In step S2010, the generated temporary filter is stored in the temporary storage unit 104 together with noise information and voice information at the time of generation, and applied as a filter corresponding to the current sound environment.

  In addition to obtaining the same effect as in the first embodiment by the above-described series of configurations and processing means, the audio signal as the target signal is gradually optimized to the user's audio, so when generating the temporary filter, It is possible to generate a filter more suitable for the user voice.

It is the block diagram which showed the basic composition of 1st Embodiment. It is the block diagram which showed the specific implementation means of 1st Embodiment. It is the block diagram which showed the standard filter production | generation process of 1st Embodiment. It is a figure which shows the memory example of the standard memory | storage part of 1st Embodiment. It is a figure which shows the adaptive process of the temporary filter production | generation means of 1st Embodiment. It is a figure which shows the memory example of the temporary memory part of 1st Embodiment. It is a figure which shows the monitoring of 1st Embodiment and the standard filter selection timing (always monitoring & always filter selection & temporary filter generation). FIG. 4 is a diagram showing monitoring and standard filter selection timings of the first embodiment (monitoring / selection is always performed, but temporary filter generation is performed only during utterance). It is a figure which shows the monitoring (standard process only at the time of speech) which shows the monitoring of 1st Embodiment, and a standard filter. It is a figure which shows the filter selection process of 1st Embodiment. It is a figure which shows the classification | category of the noise of 2nd Embodiment. It is a figure which shows a standard memory | storage part (2nd Embodiment). It is a figure which shows 2nd Embodiment (selection of the most similar noise by a noise component monitoring means (within a threshold value)). It is a figure which shows the noise monitoring result example (selection of the most similar noise by a noise component monitoring means (within a threshold value)) of 2nd Embodiment. It is a figure which shows the difference determination and filter selection of 2nd Embodiment. It is a figure which shows 2nd Embodiment (selection of the most similar noise by a noise component monitoring means (a temporary filter is also added to collation object)). It is a figure which shows a standard memory | storage part (3rd Embodiment). It is a figure which shows 3rd Embodiment (when corresponding by a standard filter). It is a figure which shows 3rd Embodiment (When there is nothing corresponding to a standard filter (temporary filter)). It is a figure which shows the specific operation example of 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 ... Sound input part, 102 ... Sound environment monitoring part, 103 ... Standard storage part, 104 ... Temporary storage part, 105 ... Filter control part, 106 ... Filter part, 201 ... Microphone, 202 ... AD conversion part, 203 ... Calculation Device 204: storage device 301 ... adder 302 ... filter 303 ... adder 401 ... adder 402 ... filter 402: adder 1021 ... voice section determination means 1022 ... noise component monitoring means 1023 ... target signal monitoring means, 1051 ... filter selection means, 1052 ... temporary filter generation means.

Claims (7)

In a voice input device having a sound input unit having one or more sound input means for acquiring a sound signal, and a filter unit for removing a noise component from the input sound acquired from the sound input unit,
Consists of speech segment determination means for determining speech segments and non-speech segments from input sound, noise component monitoring means for monitoring and acquiring noise component information, and target signal monitoring means for monitoring and acquiring target signal information A sound environment monitoring unit;
A standard storage unit for storing at least one standard sound environment and a standard filter corresponding to the standard sound environment;
Based on the information obtained from the sound environment monitoring unit, the standard sound environment stored in the standard storage unit that matches the sound environment is determined, the standard filter corresponding to the standard sound environment is selected, and the standard sound environment is selected. Filter control comprising filter selection means as contents of the filter section and temporary filter generation means as contents of the filter section when a standard sound environment suitable for the sound environment cannot be determined And
A temporary storage unit for storing the temporary filter;
A voice input device comprising:   The standard storage unit includes standard noise component information including information regarding noise components, standard target signal information including information regarding target signals, and noise in a sound environment defined by the standard noise component information and standard target signal information. 2. The voice input device according to claim 1, wherein at least one set including at least one of standard filters to be suppressed is held.   The temporary storage unit stores at least one of a temporary filter created by the filter control unit and noise component information and target signal information referenced by the filter control unit when creating the filter. Item 3. The voice input device according to Item 1 or 2. In a voice input device having a sound input unit having two or more sound input means for acquiring a sound signal, and a filter unit for removing a noise component from the input sound acquired from the sound input unit,
A voice section judging means for judging a voice section and a non-speech section from an input sound, a target signal monitoring means for monitoring and acquiring target signal information including information on a direction of arrival of a target signal, and information on a direction of arrival of a noise component. A sound environment monitoring unit comprising noise component monitoring means for monitoring and acquiring noise component information including,
A standard storage unit for storing at least one standard sound environment and a standard filter corresponding to the standard sound environment;
Based on the information obtained from the sound environment monitoring unit, the standard sound environment stored in the standard storage unit that matches the sound environment is determined, the standard filter corresponding to the standard sound environment is selected, and the standard sound environment is selected. Filter control comprising filter selection means as contents of the filter section and temporary filter generation means as contents of the filter section when a standard sound environment suitable for the sound environment cannot be determined And
A temporary storage unit for storing the temporary filter;
A voice input device comprising: The filter selection means, when there is no information in the standard storage unit that matches the noise component information and the target signal information acquired by the sound environment monitoring unit, the standard noise component information and the standard close to the noise component information and the target signal information Determine the target signal information, refer to the standard noise component information and the standard filter corresponding to the standard target signal information,
5. The voice input according to claim 1, wherein the temporary filter generation unit generates a noise suppression filter corresponding to a current sound environment by using the standard filter as an initial value, and uses the noise suppression filter as a temporary filter. apparatus.   The information obtained from the sound environment monitoring unit includes information obtained from the sound input to the sound input means, information related to vehicle speed, information related to the operation of the air conditioner, information related to opening and closing of windows, and the position of the seat. Information relating to passengers, information relating to the vehicle body, information obtained from sensors and cameras installed inside and outside the vehicle, information relating to tires, and information relating to operation target devices installed in the passenger compartment. The voice input device according to claim 1, comprising at least one or more. The temporary storage unit stores the sound signal as the target signal 0 when the noise component in the sound signal at time t0 obtained from the sound input unit can be ignored with respect to the target signal,
The filter control unit uses a pseudo-observation signal generated using a target signal 0 stored at time t0 and a noise component observed at time t1 and a target signal 0 as a temporary filter at time t1. The voice input device according to claim 1, wherein the voice input device is generated.

Images