JP2008236448A - Sound signal processing device, hands-free calling device, sound signal processing method, and control program - Google Patents

Sound signal processing device, hands-free calling device, sound signal processing method, and control program Download PDF

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JP2008236448A
JP2008236448A JP2007073939A JP2007073939A JP2008236448A JP 2008236448 A JP2008236448 A JP 2008236448A JP 2007073939 A JP2007073939 A JP 2007073939A JP 2007073939 A JP2007073939 A JP 2007073939A JP 2008236448 A JP2008236448 A JP 2008236448A
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Seiichi Suzuki
誠一 鈴木
Hiroshige Kogori
弘滋 古郡
Takashi Takayama
隆 高山
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Faurecia Clarion Electronics Co Ltd
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Clarion Co Ltd
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<P>PROBLEM TO BE SOLVED: To properly perform sound signal processing according to the kind of noise, combination of noise components, and quantity of noise. <P>SOLUTION: The sound signal processing device includes a sound signal input part 12 in which a sound signal is input; a signal processing part 15 for performing signal processing on the sound signal; and a state signal input part 16, in which a state signal indicating a state of a vehicle 100 is input, and the device further includes a control part 18 which determines present or absence of the noise contained in the sound signal, based on the state signal for each kind of the noise, refers to a parameter setting table with which a parameter used at the signal processing is associated for each kind of the noise so as to set a parameter corresponding to the kind or the combination of the noise included in the sound signal to be a parameter value that corresponds to the quantity of the noise and controls the signal processing part 15 to perform the sinal processing, based on the parameter value. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、車両内で収音された音声信号等に含まれるノイズを除去するための音声信号処理装置、ハンズフリー通話装置、音声信号処理方法および制御プログラムに関する。   The present invention relates to an audio signal processing device, a hands-free call device, an audio signal processing method, and a control program for removing noise contained in an audio signal or the like collected in a vehicle.

従来から、車載用のオーディオ装置の中には、車両の走行状態や、車両内の騒音レベルに基づいて、最適な音量ゲインを設定することにより乗員に対して最適な音量でオーディオ出力等を行う音量調整装置を備えるものが知られている（例えば、特許文献１参照）。
また、自動車等の車両内において、ユーザが携帯電話機を把持せずとも、携帯電話機を使用していわゆるハンズフリー通話を可能とするハンズフリー通話装置が知られている（例えば、特許文献２参照）。ハンズフリー通話装置を据置型のマイクロフォンや拡声装置を用いて構成する場合、通話時の音質は、走行時に生じる車両の走行音、エアコンの運転等に伴う空調音等のノイズによる影響を受けやすい。このため、この種のハンズフリー通話装置の中には、通話音質を向上するために、マイクロフォンにより取得された音声信号に対してノイズを除去すべく音声信号処理を行うようにしたものがある。
特開平１０−１７３４５８号公報 特開平１０−２７６２６１号公報 Conventionally, some in-vehicle audio devices perform audio output at an optimum volume for the occupant by setting an optimum volume gain based on the running state of the vehicle and the noise level in the vehicle. One having a volume control device is known (for example, see Patent Document 1).
There is also known a hands-free call device that enables a so-called hands-free call using a mobile phone without the user holding the mobile phone in a vehicle such as an automobile (see, for example, Patent Document 2). . When a hands-free call device is configured using a stationary microphone or a loudspeaker, the sound quality during a call is easily affected by noise such as the running sound of a vehicle generated during traveling and the air-conditioning sound associated with the operation of an air conditioner. For this reason, some hands-free call devices of this type perform voice signal processing to remove noise from a voice signal acquired by a microphone in order to improve call sound quality.
JP-A-10-173458 JP 10-276261 A

ところで、音声信号に含まれるノイズを除去するには、ノイズの量に加えて、ノイズの種類に応じた適切なパラメータ値を用いて音声信号処理を行う必要がある。しかしながら、上記従来の音量調整装置のように、車両内の騒音レベルをマイクロフォンを用いて判別し、判別された騒音レベルに基づいて音声信号処理を行う構成とすると、騒音レベルは判別することができるものの、ノイズの種類を特定することはできず、ノイズの種類に応じた適切なパラメータ値を設定することが困難であった。
すなわち、車両の走行音に起因するノイズと、空調音に起因するノイズとでは、ノイズの特性が異なり、単にノイズ量に基づいて音声信号処理を行ったのでは、所望の音質に調整することが困難であった。
本発明の課題は、ノイズの種類又はノイズ成分の組み合わせとノイズの量に応じて適切に音声信号処理を施すことのできる音声信号処理装置、ハンズフリー通話装置、音声信号処理方法および制御プログラムを提供することにある。 By the way, in order to remove noise contained in the audio signal, it is necessary to perform audio signal processing using an appropriate parameter value corresponding to the type of noise in addition to the amount of noise. However, the noise level can be determined if the configuration is such that the noise level in the vehicle is determined using a microphone and the audio signal processing is performed based on the determined noise level, as in the conventional volume control device. However, the noise type cannot be specified, and it is difficult to set an appropriate parameter value according to the noise type.
That is, the noise characteristics of the noise caused by the running sound of the vehicle and the noise caused by the air-conditioning sound are different, and if the audio signal processing is simply performed based on the noise amount, it can be adjusted to a desired sound quality. It was difficult.
An object of the present invention is to provide an audio signal processing device, a hands-free call device, an audio signal processing method, and a control program capable of appropriately performing audio signal processing according to the type of noise or a combination of noise components and the amount of noise. There is to do.

上記課題を解決するため、本発明の音声信号処理装置は、車両内で収音された音声に基づく音声信号が入力される音声信号入力部と、設定されたパラメータ値に基づいて、前記音声信号に含まれるノイズを除去すべく前記音声信号に対して信号処理を施す信号処理部と、外部から前記車両の状態を示す状態信号が入力される状態信号入力部と、前記状態信号に基づき、前記音声信号に含まれるノイズの有無をノイズの種類毎に判別するノイズ判別部と、各ノイズの種類毎に前記信号処理の際に用いるパラメータを対応付けたパラメータ設定テーブルを記憶する記憶部と、前記ノイズ判別部により判別されたノイズの種類又はノイズ成分の組み合わせに応じて、前記パラメータ設定テーブルを参照して、前記ノイズの種類又は組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定して、当該パラメータ値に基づいて、前記信号処理部に前記信号処理を施させるように制御する制御部と、を備えることを特徴とする。
上記構成によれば、車両内で収音された音声に基づく音声信号が音声信号入力部を介して入力される。信号処理部では、この音声信号に対して、設定されたパラメータ値に基づいて、前記音声信号に含まれるノイズを除去すべく信号処理を施す。ノイズ判別部は、状態信号入力部を介して入力された車両の状態を示す状態信号に基づき、前記音声信号に含まれるノイズの有無をノイズの種類毎に判別する。制御部は、記憶部に記憶されたパラメータ設定テーブルを参照して、ノイズの種類又はノイズ成分の組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定して、当該パラメータ値に基づいて、前記信号処理部に前記信号処理を施させるように制御する。従って、車両内で収音された音声信号に含まれるノイズの種類が車両の走行／停止等に伴って変動した場合であっても、ノイズの種類又はノイズ成分の組み合わせとノイズの量に応じて適切に音声信号処理を施すことができる。 In order to solve the above problems, an audio signal processing device according to the present invention includes an audio signal input unit that receives an audio signal based on audio collected in a vehicle, and the audio signal based on a set parameter value. Based on the state signal, a signal processing unit that performs signal processing on the audio signal to remove noise included in the sound signal, a state signal input unit that receives a state signal that indicates the state of the vehicle from the outside, A noise determination unit that determines the presence or absence of noise included in an audio signal for each type of noise, a storage unit that stores a parameter setting table that associates parameters used in the signal processing for each type of noise, and According to the type of noise or the combination of noise components determined by the noise determination unit, referring to the parameter setting table, according to the type or combination of noise By setting the parameter to the parameter value corresponding to the amount of noise, based on the parameter values, characterized in that it comprises a control unit for controlling such that subjected to the signal processing in the signal processing unit.
According to the above configuration, the audio signal based on the sound collected in the vehicle is input via the audio signal input unit. The signal processing unit performs signal processing on the audio signal based on the set parameter value so as to remove noise included in the audio signal. The noise discriminating unit discriminates the presence or absence of noise included in the audio signal for each type of noise based on the state signal indicating the state of the vehicle input via the state signal input unit. The control unit refers to the parameter setting table stored in the storage unit, sets a parameter according to the type of noise or a combination of noise components to a parameter value according to the amount of noise, and based on the parameter value, The signal processing unit is controlled to perform the signal processing. Therefore, even if the type of noise included in the audio signal collected in the vehicle fluctuates as the vehicle travels / stops, etc., depending on the type of noise or the combination of noise components and the amount of noise Audio signal processing can be performed appropriately.

上記構成の音声信号処理装置において、前記状態信号入力部には、前記状態信号として、少なくとも前記車両の走行状態を示す状態信号と、前記車両内に設置された空気調和装置の空気調和運転状態を示す状態信号との入力を受け、前記ノイズの種類には、前記車両の走行に起因するノイズと、前記空気調和装置の空気調和運転に起因するノイズとを含むことが好ましい。
上記構成によれば、状態信号入力部は、車両の走行状態を示す状態信号と、車両内に設置された空気調和装置の空気調和運転状態を示す状態信号との入力を受け、ノイズの種類として、車両の走行に起因するノイズと、空気調和装置の空気調和運転に起因するノイズとに応じて、それぞれノイズの種類とノイズの量に応じて適切に音声信号処理を施すことができる。また、例えば、空調運転時に車両が走行状態から停止状態となった場合に、音声信号に含まれるノイズから空気調和装置に起因するノイズだけになった場合でも、ノイズの種類の変化（ノイズ成分の組み合わせの変化）に応じて、適切に音声信号処理を施すことができる。 In the audio signal processing device having the above-described configuration, the state signal input unit includes at least a state signal indicating a traveling state of the vehicle and an air-conditioning operation state of the air-conditioning apparatus installed in the vehicle as the state signal. Preferably, the type of noise includes noise caused by running of the vehicle and noise caused by air conditioning operation of the air conditioner.
According to the above configuration, the state signal input unit receives an input of a state signal indicating the running state of the vehicle and a state signal indicating the air-conditioning operation state of the air conditioner installed in the vehicle. According to the noise caused by the running of the vehicle and the noise caused by the air-conditioning operation of the air conditioner, the audio signal processing can be appropriately performed according to the type of noise and the amount of noise. In addition, for example, when the vehicle is stopped from the running state during the air-conditioning operation, even if only the noise caused by the air conditioner is changed from the noise included in the audio signal, the change in the noise type (the noise component) Audio signal processing can be appropriately performed according to the change in the combination.

また、上記構成の音声信号処理装置において、前記状態信号入力部には、前記状態信号として、窓の開閉量を示す信号の入力を受け、前記ノイズの種類には、風切り音に起因するノイズを含むことが好ましい。
当該構成によれば、窓の開閉量により変化する風切り音に起因するノイズについても、適切に音声信号処理を施すことができる。 In the audio signal processing device having the above configuration, the state signal input unit receives a signal indicating a window opening / closing amount as the state signal, and the noise type includes noise caused by wind noise. It is preferable to include.
According to this configuration, it is possible to appropriately perform audio signal processing on noise caused by wind noise that varies depending on the opening / closing amount of the window.

また、上記構成の音声信号処理装置において、前記状態信号入力部には、前記状態信号として、ワイパー速度を示す信号の入力を受け、前記ノイズの種類には、ワイパーの動作に起因するノイズ又は雨音に起因するノイズを含むことが好ましい。
当該構成によれば、ワイパー速度により変化するワイパーの動作に起因するノイズについても適切に音声信号処理を施すことができる。また、周囲の雨音の有無や雨音の大きさ等をワイパー速度により推定して、雨音の大きさに応じて、適切に音声信号処理を施すことができる。 In the audio signal processing apparatus having the above configuration, the state signal input unit receives a signal indicating a wiper speed as the state signal, and the noise type includes noise or rain caused by the operation of the wiper. It is preferable to include noise caused by sound.
According to this configuration, it is possible to appropriately perform audio signal processing on noise caused by the operation of the wiper that changes depending on the wiper speed. In addition, the presence or absence of the surrounding rain sound, the magnitude of the rain sound, and the like can be estimated from the wiper speed, and the sound signal processing can be appropriately performed according to the magnitude of the rain sound.

また、上記構成の音声信号処理装置において、前記制御部は、前記音声信号に含まれるノイズの種類又はノイズ成分の組み合わせが変化した場合、変化後のノイズの種類又はノイズ成分の組み合わせに応じたパラメータを変化後のノイズ量に応じて新たなパラメータ値に設定するまでの間は、変化前に設定されたパラメータ値に基づいて、前記信号処理部に前記信号処理を施させることが好ましい。
この構成によれば、制御部は、信号処理の際に用いるパラメータ値をノイズの種類やノイズの変化の種類に応じて切り換える際に、新たなパラメータ値を設定するまでの間は、変化前に設定されたパラメータ値に基づいて、信号処理部に信号処理を施させるので、ノイズの種類の変化やノイズ成分の組み合わせの変化に応じてリアルタイムにパラメータ値を変更する場合に比較して、異音が発生する等の不具合が生じるのを防ぐことができる。 Further, in the audio signal processing device having the above configuration, when the type of noise or the combination of noise components included in the audio signal changes, the control unit determines a parameter according to the type of noise or the combination of noise components after the change. It is preferable that the signal processing unit perform the signal processing based on the parameter value set before the change until the parameter value is set to a new parameter value according to the noise amount after the change.
According to this configuration, when the parameter value used for signal processing is switched according to the type of noise or the type of change in noise, the control unit does not change until a new parameter value is set. Since the signal processing unit performs signal processing based on the set parameter value, compared with the case where the parameter value is changed in real time according to the change in the type of noise or the change in the combination of noise components, It is possible to prevent the occurrence of problems such as

また、本発明の音声信号処理装置は、音源装置から車両内に拡声するための音響信号が入力される音響信号入力部と、設定されたパラメータ値に基づいて、前記音響信号に対して音質を調整すべく信号処理を施す信号処理部と、外部から前記車両の状態を示す状態信号が入力される状態信号入力部と、前記状態信号に基づき、車両内のノイズの有無をノイズの種類毎に判別するノイズ判別部と、各ノイズの種類毎に前記信号処理の際に用いるパラメータを対応付けたパラメータ設定テーブルを記憶する記憶部と、前記ノイズ判別部により判別されたノイズの種類又はノイズ成分の組み合わせに応じて、前記パラメータ設定テーブルを参照して、前記ノイズの種類又は組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定して、当該パラメータ値に基づいて、前記信号処理部に前記信号処理を施させるように制御する制御部と、を備えることを特徴とする。
この構成によれば、例えば、車載オーディオ装置等の様に、ＣＤ再生装置やラジオチューナ等の音源装置から入力される音響信号（音声信号）を車両内に設置された拡声装置を介して拡声する際に、車両内に拡声する音響信号の音質を車両内のノイズの種類又はノイズ成分の組み合わせとノイズの量に応じて適切に音響信号処理を施して、音質を調整することができる。 Further, the audio signal processing device of the present invention has an audio signal input unit to which an audio signal for amplifying the sound from the sound source device into the vehicle is input, and a sound quality for the audio signal based on a set parameter value. A signal processing unit that performs signal processing to adjust, a state signal input unit that receives a state signal indicating the state of the vehicle from the outside, and the presence or absence of noise in the vehicle based on the state signal for each type of noise A noise discriminating unit that discriminates, a storage unit that stores a parameter setting table in which a parameter used in the signal processing is associated with each noise type, and a noise type or a noise component discriminated by the noise discriminating unit Depending on the combination, referring to the parameter setting table, the parameter corresponding to the noise type or combination is set to a parameter value corresponding to the amount of noise. Based on the parameter values, characterized in that it comprises a control unit for controlling such that subjected to the signal processing in the signal processing unit.
According to this configuration, for example, a sound signal (audio signal) input from a sound source device such as a CD playback device or a radio tuner is amplified via a loudspeaker installed in the vehicle, such as an in-vehicle audio device. In this case, the sound quality of the sound signal that is amplified in the vehicle can be adjusted by appropriately performing sound signal processing according to the type of noise in the vehicle or the combination of noise components and the amount of noise.

また、本発明のハンズフリー通話装置は、音声を収音して音声信号に変換する収音部と、携帯電話端末と所定の通信プロトコルに従って、前記音声信号を送信するとともに前記携帯電話端末から音声信号を受信する通信部と、前記通信部において受信した音声信号を出力する出力部とを備え、前記携帯電話端末をハンズフリーで通話可能とするハンズフリー通話装置において、設定されたパラメータ値に基づいて、前記音声信号に対して音質を調整すべく信号処理を施す信号処理部と、外部から前記車両の状態を示す状態信号が入力される状態信号入力部と、前記状態信号に基づき、前記車両内のノイズの有無をノイズの種類毎に判別するノイズ判別部と、各ノイズの種類毎に前記信号処理の際に用いるパラメータを対応付けたパラメータ設定テーブルを記憶する記憶部と、前記ノイズ判別部により判別されたノイズの種類又はノイズ成分の組み合わせに応じて、前記パラメータ設定テーブルを参照して、前記ノイズの種類又は組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定して、当該パラメータ値に基づいて、前記信号処理部に前記信号処理を施させるように制御する制御部と、を備えることを特徴とする。   The hands-free call device according to the present invention also includes a sound collection unit that collects voice and converts it into a voice signal, and transmits the voice signal according to a predetermined communication protocol with the mobile phone terminal and transmits voice from the mobile phone terminal. In a hands-free call device that includes a communication unit that receives a signal and an output unit that outputs an audio signal received in the communication unit, and enables the mobile phone terminal to perform a hands-free call, based on a set parameter value A signal processing unit that performs signal processing on the audio signal to adjust sound quality, a state signal input unit that receives a state signal indicating the state of the vehicle from the outside, and the vehicle based on the state signal. A parameter setting in which a noise discrimination unit for discriminating the presence or absence of noise in each noise type and a parameter used in the signal processing for each noise type are associated with each other. A storage unit that stores a table and a parameter corresponding to the noise type or combination by referring to the parameter setting table according to a noise type or a combination of noise components determined by the noise determination unit. And a control unit that controls the signal processing unit to perform the signal processing based on the parameter value.

また、本発明の音声信号処理方法は、車両内で収音された音声に基づく音声信号が入力される音声信号入力部と、設定されたパラメータ値に基づいて、前記音声信号に対して信号処理を施す信号処理部と、外部から前記車両の状態を示す状態信号が入力される状態信号入力部と、各ノイズの種類毎に前記信号処理の際に用いるパラメータを対応付けたパラメータ設定テーブルを記憶する記憶部と、を備えた音声信号処理装置を用いて前記音声信号に含まれるノイズを除去すべく前記音声信号に対して信号処理を施す音声信号処理方法であって、前記状態信号に基づき、前記音声信号に含まれるノイズの有無をノイズの種類毎に判別する過程と、前記ノイズ判別部により判別されたノイズの種類又はノイズ成分の組み合わせに応じて、前記パラメータ設定テーブルを参照して、前記ノイズの種類又は組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定する過程と、当該パラメータ値に基づいて、前記信号処理部に前記信号処理を施させる過程と、を備えることを特徴とする。   Also, the audio signal processing method of the present invention includes an audio signal input unit to which an audio signal based on audio collected in a vehicle is input, and signal processing for the audio signal based on a set parameter value. A signal processing unit for performing the processing, a state signal input unit for inputting a state signal indicating the state of the vehicle from the outside, and a parameter setting table in which parameters used for the signal processing are associated with each noise type An audio signal processing method for performing signal processing on the audio signal to remove noise included in the audio signal using an audio signal processing device including a storage unit, and based on the status signal, According to the process of determining the presence or absence of noise included in the audio signal for each type of noise, and the combination of noise type or noise component determined by the noise determination unit. A process for setting a parameter corresponding to the noise type or combination to a parameter value corresponding to the amount of noise with reference to a data setting table, and performing the signal processing on the signal processing unit based on the parameter value. And the process of making it comprise.

また、本発明の制御プログラムは、車両内で収音された音声に基づく音声信号が入力される音声信号入力部と、設定されたパラメータ値に基づいて、前記音声信号に含まれるノイズを除去すべく前記音声信号に対して信号処理を施す信号処理部と、外部から前記車両の状態を示す状態信号が入力される状態信号入力部と、各ノイズの種類毎に前記信号処理の際に用いるパラメータを対応付けたパラメータ設定テーブルを記憶する記憶部と、を備えた音声信号処理装置をコンピュータを用いて制御するための制御プログラムであって、前記状態信号に基づき、前記音声信号に含まれるノイズの有無をノイズの種類毎に判別させ、前記ノイズ判別部により判別されたノイズの種類又はノイズ成分の組み合わせに応じて、前記パラメータ設定テーブルを参照して、前記ノイズの種類又は組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定させ、当該パラメータ値に基づいて、前記信号処理部に前記信号処理を施させること、を特徴とする。   Further, the control program of the present invention removes noise included in the audio signal based on the audio signal input unit to which an audio signal based on the audio collected in the vehicle is input and the set parameter value. Therefore, a signal processing unit that performs signal processing on the audio signal, a state signal input unit that receives a state signal indicating the state of the vehicle from the outside, and a parameter that is used for the signal processing for each type of noise And a storage unit for storing a parameter setting table in association with each other, and a control program for controlling the audio signal processing device using a computer, based on the state signal, the noise of the audio signal Presence / absence is determined for each type of noise, and the parameter setting table is selected according to the type of noise or the combination of noise components determined by the noise determination unit. The parameter according to the noise type or combination is set to a parameter value according to the amount of noise, and the signal processing unit is configured to perform the signal processing based on the parameter value. To do.

本発明によれば、車両内のノイズが車両の走行／停止等に伴って変動した場合であっても、ノイズの種類又はノイズ成分の組み合わせとノイズの量に応じて適切に音声信号処理を施すことができる。   According to the present invention, even when the noise in the vehicle fluctuates with the running / stop of the vehicle, etc., the audio signal processing is appropriately performed according to the type of noise or the combination of noise components and the amount of noise. be able to.

以下、図面を参照して本発明の実施の形態について説明する。
図１に示すように、本実施の形態に係る音声信号処理装置、ハンズフリー通話装置は、自動車等の車両１００に搭載される車載機器１０として構成され、当該車両１００を運転する運転者や同乗者が所有する携帯電話機２０（携帯電話端末）２０と所定の通信プロトコルに従って通信を行い、これらの携帯電話機２０に対してハンズフリー通話を可能にする装置である。 Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the audio signal processing device and the hands-free call device according to the present embodiment are configured as an in-vehicle device 10 mounted on a vehicle 100 such as an automobile, and a driver or a rider who drives the vehicle 100. This is a device that communicates with a mobile phone 20 (mobile phone terminal) 20 owned by a person according to a predetermined communication protocol, and enables hands-free communication with these mobile phones 20.

車載機器１０と携帯電話機２０との間は、例えば、近距離無線通信の一つであるBluetooth（登録商標、以下同じ）を用いて、無線通信により音声信号の送受信を行うことができる。なお、近距離無線通信として無線ＬＡＮを用いる構成としても良く、また、無線通信に限らず、有線通信であっても良いが本実施の形態では無線通信を行うものとして以下説明する。   Audio signals can be transmitted and received between the in-vehicle device 10 and the mobile phone 20 by wireless communication using, for example, Bluetooth (registered trademark, the same applies hereinafter), which is one of short-range wireless communication. Note that a configuration using a wireless LAN as short-range wireless communication may be used, and not limited to wireless communication, but may be wired communication. In the present embodiment, the following description will be made assuming that wireless communication is performed.

図２は、上記車載機器１０の機能的構成を、携帯電話機２０と共に示すブロック図である。携帯電話機２０は、図示しない移動通信網を介して携帯端末キャリアを受信或いは送信して、他の携帯端末や固定電話と通話通信するものであり、内蔵拡声装置や内蔵マイク、電話通信のための通信部、音声通信やデータ通信のための通信端子といった一般的な携帯電話機２０が有する構成を備えると共に、車載機器１０と上述した所定のプロトコルに従って近距離無線通信するための近距離無線通信用の通信モジュール（例えば、Bluetoothモジュール）（図示略）を備えている。   FIG. 2 is a block diagram showing a functional configuration of the in-vehicle device 10 together with the mobile phone 20. The mobile phone 20 receives or transmits a mobile terminal carrier via a mobile communication network (not shown), and communicates with other mobile terminals and landline telephones. The mobile phone 20 has a configuration such as a communication unit, a communication terminal for voice communication and data communication, and is used for short-range wireless communication for short-range wireless communication with the in-vehicle device 10 according to the predetermined protocol described above. A communication module (for example, a Bluetooth module) (not shown) is provided.

一方、車載機器１０は、収音装置（収音部）３０、音源装置４０、拡声装置５０と接続され、図２に示すように、携帯電話機２０との間で音声信号の送受を行う近距離無線通信部１１と、収音装置３０において収音された音声信号の入力を受ける音声信号入力部１２と、音源装置４０から音響信号の入力を受ける音響信号入力部１３と、携帯電話機２０から受信した音声信号又は音源装置４０から入力された音響信号（音声信号）を拡声装置５０に出力する音声信号出力部１４と、これらの音声信号（音響信号を含む）に対して音質を調整すべく信号処理を施す信号処理部１５と、車両１００の各種状態を示す状態信号の入力を受ける状態信号入力部１６と、ノイズの種類又はノイズ成分の組み合わせ毎に信号処理部１５において用いられるパラメータを対応付けたパラメータ設定テーブルを記憶する記憶部１７と、制御部１８とを備えている。   On the other hand, the in-vehicle device 10 is connected to a sound collection device (sound collection unit) 30, a sound source device 40, and a loudspeaker device 50, and transmits and receives audio signals to and from the mobile phone 20, as shown in FIG. Radio communication unit 11, audio signal input unit 12 that receives an input of an audio signal collected by sound collection device 30, acoustic signal input unit 13 that receives an input of an acoustic signal from sound source device 40, and reception from mobile phone 20 The audio signal output unit 14 that outputs the audio signal or the audio signal (audio signal) input from the sound source device 40 to the loudspeaker 50 and a signal for adjusting the sound quality of these audio signals (including the audio signal) The signal processing unit 15 that performs processing, the state signal input unit 16 that receives input of state signals indicating various states of the vehicle 100, and the signal processing unit 15 for each type of noise or combination of noise components. A storage unit 17 for storing the parameter setting table correlating parameters, and a control unit 18.

近距離無線通信部１１は、制御部１８の制御の下、車両１００内の携帯電話機２０と所定の通信プロトコルに従って近距離無線通信を行うものであり、携帯電話機２０に着信があった場合に送信される着信トリガ信号を受信して、制御部１８に出力し、携帯電話機２０から送信された受話音声（音声信号）を受信して、信号処理部１５に出力するとともに、収音装置３０、音声信号入力部１２、信号処理部１５を介して送話音声（音声信号）の入力を受け、この送話音声を携帯電話機２０に送信するものである。例えば、所定の通信プロトコルとして上述したBluetoothプロトコルに従う場合、Bluetoothモジュールを用いて構成することができる。   The near field communication unit 11 performs near field communication with the mobile phone 20 in the vehicle 100 in accordance with a predetermined communication protocol under the control of the control unit 18 and is transmitted when the mobile phone 20 receives an incoming call. The incoming call trigger signal is received and output to the control unit 18, the received voice (audio signal) transmitted from the mobile phone 20 is received and output to the signal processing unit 15, and the sound collection device 30, the voice A voice signal (voice signal) is input via the signal input unit 12 and the signal processing unit 15, and the voice signal is transmitted to the mobile phone 20. For example, when following the above-described Bluetooth protocol as a predetermined communication protocol, it can be configured using a Bluetooth module.

なお、当該車載機器１０と携帯電話機２０とを有線にて接続可能とする場合には、車載機器１０に通信ケーブルが接続される通信Ｉ／Ｆ（インターフェース）を設け、当該通信Ｉ／Ｆを介して携帯電話機２０と受話音声、送話音声及び各種制御コマンドを送受する構成とすれば良い。   When the in-vehicle device 10 and the mobile phone 20 can be connected by wire, a communication I / F (interface) to which a communication cable is connected is provided in the in-vehicle device 10, and the communication I / F is connected via the communication I / F. The mobile phone 20 may be configured to transmit and receive received voice, transmitted voice, and various control commands.

収音装置３０は、車両１００内に配置される据置型のマイクロフォンであり、無指向性の小型マイクを用いて構成される。収音装置３０では、話者（運転者や搭乗者等）が発話した音声をアナログの音声信号に変換して、上記音声信号入力部１２に音声信号を出力する。   The sound collection device 30 is a stationary microphone disposed in the vehicle 100, and is configured using a small omnidirectional microphone. The sound collection device 30 converts the voice uttered by a speaker (driver, passenger, etc.) into an analog voice signal and outputs the voice signal to the voice signal input unit 12.

音声信号入力部１２は、図示しない制御線を介して制御部１８と接続され、制御部１８の制御下で動作する。音声信号入力部１２は、図示しないゲイン調整回路等を備え、制御部１８により設定されるマイクゲイン値に従って、収音装置３０から出力される音声信号の増幅等を行うものである。音声信号入力部１２において増幅等が行われた音声信号は信号処理部１５に出力される。   The audio signal input unit 12 is connected to the control unit 18 via a control line (not shown) and operates under the control of the control unit 18. The audio signal input unit 12 includes a gain adjustment circuit (not shown) and the like, and amplifies an audio signal output from the sound collection device 30 in accordance with a microphone gain value set by the control unit 18. The audio signal that has been amplified by the audio signal input unit 12 is output to the signal processing unit 15.

音源装置４０は、例えば、ＣＤＤＡ（Compact Disc Digital Audio：音楽ＣＤ）を再生するＣＤ再生装置、ＤＶＤ（Digital Versatile Disk）を再生するＤＶＤ再生装置、ラジオ放送を受信するラジオ受信装置等を用いて構成することができる。音源装置４０は、図示しない制御線を介して、制御部１８との間で各種制御信号の送受を行い、制御部１８の制御の下、所定の音響信号を音響信号入力部１３に出力する。
音響信号入力部１３は、図示しない制御線を介して、制御部１８と接続され、制御部１８の制御の下、音源装置４０において再生された音響信号の入力を受ける。この音響信号入力部１３に入力された音響信号は信号処理部１５に出力される。 The sound source device 40 is configured using, for example, a CD playback device that plays a CDDA (Compact Disc Digital Audio: music CD), a DVD playback device that plays a DVD (Digital Versatile Disk), a radio reception device that receives a radio broadcast, and the like. can do. The sound source device 40 transmits and receives various control signals to and from the control unit 18 via a control line (not shown), and outputs a predetermined acoustic signal to the acoustic signal input unit 13 under the control of the control unit 18.
The acoustic signal input unit 13 is connected to the control unit 18 via a control line (not shown), and receives an input of an acoustic signal reproduced in the sound source device 40 under the control of the control unit 18. The acoustic signal input to the acoustic signal input unit 13 is output to the signal processing unit 15.

音声信号出力部１４は、図示しない制御線を介して、制御部１８と接続され、制御部１８の制御の下、信号処理部１５を介して近距離無線通信部１１又は音源装置４０から出力される音声信号（音響信号を含む）を、車両１００内に設置される一又は複数の拡声装置５０に対して出力するものである。
拡声装置５０は、音声信号を音波に変換するスピーカであり、音声信号出力部１４は信号処理部１５から出力されるデジタル信号としての音声信号をアナログ信号に変換するＤ／Ａコンバータ（図示略）や、アナログ信号に変換された音声信号を増幅するアンプ（図示略）等を備えている。 The audio signal output unit 14 is connected to the control unit 18 through a control line (not shown), and is output from the short-range wireless communication unit 11 or the sound source device 40 through the signal processing unit 15 under the control of the control unit 18. Audio signals (including acoustic signals) are output to one or a plurality of loudspeakers 50 installed in the vehicle 100.
The loudspeaker 50 is a speaker that converts an audio signal into a sound wave, and the audio signal output unit 14 is a D / A converter (not shown) that converts an audio signal as a digital signal output from the signal processing unit 15 into an analog signal. And an amplifier (not shown) for amplifying an audio signal converted into an analog signal.

信号処理部１５は、制御部１８の制御の下、収音装置３０から音声信号入力部１２を介して入力される音声信号または、携帯電話機２０または音源装置４０から、近距離無線通信部１１又は音響信号入力部１３を介して入力される音声信号（音響信号を含む）に対して、音質を所定の状態に調整するための信号処理を施すものである。
具体的には、信号処理部１５はいわゆるエコーキャンセラ装置やノイズリダクション装置を備え、音声信号出力部１４において拡声再生された音声が収音装置３０により収音されたり、車両１００の走行音（エンジンノイズ、ロードノイズ等）、空気調和装置の空調音、風切り音、雨天時等に生じるワイパーの動作音、あるいは雨音などが収音されたりすることにより音声信号に含まれるエコー成分やノイズ成分を除去あるいは低減するための信号処理を音声信号に対して施す。音声信号に対して信号処理を施す際に、信号処理部１５は制御部１８により設定されるパラメータ値に基づいて信号処理を施す。 Under the control of the control unit 18, the signal processing unit 15 receives an audio signal input from the sound collection device 30 via the audio signal input unit 12, or the short-range wireless communication unit 11 or the mobile phone 20 or the sound source device 40. Signal processing for adjusting the sound quality to a predetermined state is performed on an audio signal (including an acoustic signal) input via the acoustic signal input unit 13.
Specifically, the signal processing unit 15 includes a so-called echo canceller device or noise reduction device, and the sound reproduced and reproduced by the sound signal output unit 14 is collected by the sound collecting device 30 or the running sound (engine) of the vehicle 100 is collected. Noise, road noise, etc.), air-conditioning sound of air conditioner, wind noise, wiper operation sound generated in rainy weather, etc. Signal processing for removal or reduction is performed on the audio signal. When performing signal processing on the audio signal, the signal processing unit 15 performs signal processing based on the parameter value set by the control unit 18.

状態信号入力部１６は、制御部１８においてノイズの有無をノイズの種類毎に判別するために用いる車両１００の各種状態を示す状態信号の入力を受けるものである。
車両１００の各種状態を示す状態信号として、例えば、車両１００の走行状態を示す走行状態信号、車両１００内に設置された空気調和装置の空気調和運転状態を示す空調運転状態信号、ワイパー速度等を示すワイパー状態信号、窓の開閉量を示す窓開閉状態信号等がある。これらの車両１００の各種状態を示す状態信号は、車両１００の各種制御を行う制御装置等から入力を受ける構成とすることができる。 The state signal input unit 16 receives input of state signals indicating various states of the vehicle 100 used for the control unit 18 to determine the presence or absence of noise for each type of noise.
Examples of the state signal indicating various states of the vehicle 100 include a traveling state signal indicating the traveling state of the vehicle 100, an air conditioning operation state signal indicating the air conditioning operation state of the air conditioner installed in the vehicle 100, a wiper speed, and the like. A wiper state signal indicating the window opening / closing state signal indicating a window opening / closing amount. The state signals indicating the various states of the vehicle 100 can be configured to receive input from a control device or the like that performs various controls of the vehicle 100.

具体的には、走行状態信号として車速パルス、エンジンの回転数を示す信号、加速度を示す信号等を車両１００の各種制御を行う制御装置から入力を受ける構成とすることができる。また、車載機器１０がカーナビゲーション装置である場合、あるいはカーナビゲーション装置が車載機器１０とは別に車両１００に設置されている場合、カーナビゲーション装置から走行している道路が一般道路か高速道路かの別を示す信号等の入力を受ける構成とすることができる。これらの走行状態信号の入力に基づいて、制御部１８では、車両１００が走行中であるか停車中であるかを判別することができ、車両１００の走行に起因するノイズ（ロードノイズ、エンジンノイズ等）の有無や、車両１００の走行速度や走行している道路の種別等によって変化するノイズ量を判別（演算）することができる。   Specifically, a vehicle speed pulse, a signal indicating the number of revolutions of the engine, a signal indicating acceleration, and the like can be received from the control device that performs various controls of the vehicle 100 as the driving state signal. When the in-vehicle device 10 is a car navigation device, or when the car navigation device is installed in the vehicle 100 separately from the in-vehicle device 10, whether the road running from the car navigation device is a general road or a highway. It can be configured to receive an input of a signal indicating another. Based on the input of these running state signals, the control unit 18 can determine whether the vehicle 100 is running or stopped, and noise (road noise, engine noise) caused by the running of the vehicle 100. Etc.), the amount of noise that varies depending on the traveling speed of the vehicle 100, the type of road on which the vehicle is traveling, and the like can be determined (calculated).

また、空調運転状態信号として、例えば、車両１００に設置された空気調和装置を制御する制御装置から、空調運転の有無や空調時の風量の設定情報等の入力を受ける構成とすることができる。これらの空調運転状態信号の入力に基づいて、制御部１８では、空気調和装置が空調運転を行っているか否かに基づいて、空気調和装置の空調運転に起因するノイズの有無や、風量等によって変化するノイズ量を判別（演算）することができる。   Further, as the air conditioning operation state signal, for example, it is possible to receive input from the control device that controls the air conditioner installed in the vehicle 100, such as the presence / absence of the air conditioning operation and the setting information of the air volume during air conditioning. Based on the input of these air conditioning operation state signals, the control unit 18 determines whether there is noise caused by the air conditioning operation of the air conditioner, the amount of air flow, etc., based on whether the air conditioner is performing the air conditioning operation. The amount of noise that changes can be determined (calculated).

また、ワイパー速度等を示すワイパー状態信号は、ワイパーの動作を制御する制御装置から入力を受ける構成とすることができる。ワイパー状態信号の入力に基づいて、制御部１８は、ワイパーの動作に起因するノイズの有無や、ワイパー速度によって変化するノイズ量を判別（演算）することができる。また、ワイパーが動作している間は雨天のときである可能性が高く、ワイパー速度が速いほど、雨が強く雨音が激しい場合が多い。そこで、制御部１８では、ワイパー状態信号の入力に基づいて、雨音に起因するノイズの有無および、雨の強度によって変化するノイズ量を判別（演算）することができるように構成されている。   Further, the wiper state signal indicating the wiper speed or the like can be configured to receive an input from a control device that controls the operation of the wiper. Based on the input of the wiper state signal, the control unit 18 can determine (calculate) the presence or absence of noise due to the operation of the wiper and the amount of noise that varies depending on the wiper speed. Further, there is a high possibility that it is raining while the wiper is in operation, and the faster the wiper speed, the stronger the rain and the stronger the rain sound. Therefore, the control unit 18 is configured to be able to determine (calculate) the presence / absence of noise caused by rain sound and the amount of noise that changes depending on the intensity of rain based on the input of the wiper state signal.

また、窓の開閉量を示す窓開閉状態信号は、窓の開閉を制御するパワーウインド装置等から窓の開閉量等を示す信号の入力を受ける構成とすることができる。車両１００の走行に伴って風切り音が発生するが、窓の開閉の有無や窓の開き具合によって、車両１００の内部における風切り音の大きさは異なる。また、窓が開いている場合、車両１００内の音響空間が変化する。そこで、制御部１８は、窓開閉状態信号の入力を受けて、車両１００内の風切り音に起因するノイズ量を判別（演算）したり、音響空間に対する影響を演算したりすることができる。   The window opening / closing state signal indicating the opening / closing amount of the window may be configured to receive a signal indicating the opening / closing amount of the window from a power window device that controls the opening / closing of the window. Wind noise is generated as the vehicle 100 travels, but the magnitude of wind noise in the vehicle 100 varies depending on whether the window is opened or closed and how the window is opened. When the window is open, the acoustic space in the vehicle 100 changes. Therefore, the control unit 18 can receive (input) the window open / closed state signal, determine (calculate) the amount of noise caused by wind noise in the vehicle 100, and calculate the influence on the acoustic space.

記憶部１７は、制御部１８によって実行される制御プログラムや各種データを記憶するものであり、ＲＯＭやＲＡＭ等のメモリ素子を備え、制御部１８によりアクセス可能に構成されたものである。また、記憶部１７は、上記パラメータ値を設定するために、予め各ノイズの種類毎に前記信号処理の際に用いるパラメータ情報（パラメータ）を対応付けたパラメータ設定テーブルを格納するパラメータ設定テーブル格納領域１７ａを有する（図３参照）。   The storage unit 17 stores a control program executed by the control unit 18 and various data. The storage unit 17 includes a memory element such as a ROM or a RAM and is configured to be accessible by the control unit 18. The storage unit 17 is a parameter setting table storage area for storing a parameter setting table in which parameter information (parameters) used in the signal processing is associated with each noise type in advance in order to set the parameter value. 17a (see FIG. 3).

パラメータ設定テーブルは、制御部１８が信号処理部１５に対して音声信号に信号処理を施させる際に用いるパラメータ値を設定するために参照されるもので、ノイズの各種類毎に上記パラメータ情報が対応付けられている他、音声信号に含まれるノイズが複数のノイズ成分を含む場合に参照するためのパラメータ情報として、ノイズ成分の組み合わせ毎に対応付けたパラメータ情報を有している。   The parameter setting table is referred to for setting parameter values used when the control unit 18 causes the signal processing unit 15 to perform signal processing on the audio signal. The parameter information is stored for each type of noise. In addition to the correspondence, parameter information associated with each combination of noise components is included as parameter information for reference when the noise included in the audio signal includes a plurality of noise components.

図示例においては、例えば、パラメータ設定テーブルにおいてノイズの種類毎にパラメータ情報を対応付けた例として、車両１００の走行に起因するノイズ（走行音）Ａに対してパラメータ情報ＰAが対応付けられており、空気調和装置の空調運転に起因するノイズ（空調音）Ｂに対してパラメータ情報ＰBが対応付けられており、ノイズＣに対してパラメータ情報ＰCが対応付けられている。また、パラメータ設定テーブルでは、ノイズ成分の組み合わせとして、ノイズＡとノイズＢがノイズとして音声信号に含まれる場合に参照されるパラメータ情報として、パラメータ情報ＰA+Bが対応付けられている。また、ノイズＡとノイズＣがノイズとして音声信号に含まれる場合に参照されるパラメータ情報として、パラメータ情報ＰA+Cが対応付けられている。 In the illustrated example, for example, as an example that associates parameter information for each type of noise in the parameter setting table, noise caused by the traveling of the vehicle 100 (running noise) and parameter information P A is associated to the A The parameter information P B is associated with the noise (air-conditioning sound) B resulting from the air-conditioning operation of the air conditioner, and the parameter information P C is associated with the noise C. In the parameter setting table, parameter information P A + B is associated as parameter information that is referred to when noise A and noise B are included as noise in the audio signal as a combination of noise components. Also, parameter information P A + C is associated as parameter information that is referred to when noise A and noise C are included in the audio signal as noise.

パラメータ情報は、例えば、信号処理部１５において音声信号からノイズ成分等を除去するために用いる適応フィルタのフィルタ係数あるいはマイクゲイン値などの各パラメータ値に関する情報を含む。これらのパラメータ値は、ノイズ（エコーを含む）の種類や音声信号に含まれるノイズ成分の種類の組み合わせに応じて、通話品質が最適となるようなパラメータ情報が予め対応付けられていることが好ましい。また、通信接続される携帯電話機２０の機種毎に、車載機器１０が設置される車両１００の車種において、通話品質が最適となるようなパラメータ情報が対応付けられているとより好ましい。   The parameter information includes, for example, information on each parameter value such as a filter coefficient or a microphone gain value of an adaptive filter used for removing a noise component or the like from the audio signal in the signal processing unit 15. These parameter values are preferably associated in advance with parameter information that optimizes the call quality according to the combination of the type of noise (including echo) and the type of noise component included in the audio signal. . In addition, it is more preferable that parameter information that optimizes the call quality is associated with the model of the vehicle 100 in which the in-vehicle device 10 is installed for each model of the mobile phone 20 that is connected for communication.

制御部１８は、ＣＰＵ等を用いて構成され、記憶部１７に記憶された各種制御プログラム等に従って、携帯電話機２０をハンズフリーで通話可能となるように上記各部を制御するものである。制御部１８は、近距離無線通信部１１を介して携帯電話機２０から着信トリガ信号を受け取ると、携帯電話機２０をハンズフリー通話状態とすべく、各種制御コマンドを近距離無線通信部１１を介して携帯電話機２０に送信し、当該携帯電話機２０に対して、内蔵拡声装置からの音声出力及び内蔵マイクからの音声入力を禁止させると共に、受話音声を内蔵の近距離無線通信部１１を介して送信させて、当該携帯電話機２０の動作モードをハンズフリー通話モードに移行させる。   The control unit 18 is configured using a CPU or the like, and controls each of the above units so that the mobile phone 20 can make a hands-free call according to various control programs stored in the storage unit 17. When receiving the incoming trigger signal from the mobile phone 20 via the short-range wireless communication unit 11, the control unit 18 sends various control commands via the short-range wireless communication unit 11 to place the mobile phone 20 in a hands-free call state. Transmitting to the mobile phone 20, prohibiting voice output from the built-in loudspeaker and voice input from the built-in microphone to the mobile phone 20 and transmitting the received voice via the built-in short-range wireless communication unit 11. Thus, the operation mode of the mobile phone 20 is shifted to the hands-free call mode.

また、制御部１８は、携帯電話機２０の動作モードをハンズフリー通話モードから単独使用可能な通常動作モードに移行させる際には、近距離無線通信部１１を介して当該携帯電話機２０に対して各種制御コマンドを送信し、内蔵拡声装置の音声出力及び内蔵マイクからの音声入力を許可する。   Further, when the control unit 18 shifts the operation mode of the mobile phone 20 from the hands-free call mode to the normal operation mode that can be used independently, the control unit 18 performs various operations on the mobile phone 20 via the short-range wireless communication unit 11. A control command is transmitted, and the voice output of the built-in loudspeaker and the voice input from the built-in microphone are permitted.

また、制御部１８は、携帯電話機２０の動作モードを上述の様にハンズフリー通話モードに移行させた場合、信号処理部１５により、携帯電話機２０に対して近距離無線通信部１１を介して送信する音声信号に対して信号処理を施す際に用いるパラメータ値を次のようにして設定する。   Further, when the operation mode of the mobile phone 20 is shifted to the hands-free call mode as described above, the control unit 18 transmits the signal to the mobile phone 20 via the short-range wireless communication unit 11 by the signal processing unit 15. The parameter value used when performing signal processing on the audio signal to be set is set as follows.

以下、音声信号送信時におけるパラメータ値の設定および信号処理に係る動作について図４を参照して説明する。車載機器１０と携帯電話機２０との間で無線通信接続が確立され、ハンズフリー通話が開始されると、制御部１８は、まず、音声信号入力部１２を介して収音装置３０により収音された車両１００内の音声に基づく音声信号の入力の有無を判別する（ステップＳ１）。ここで、音声信号入力部１２を介して収音装置３０から音声信号が入力されていると判別されると（ステップＳ１：Ｙ）、制御部１８は、次に、状態信号入力部１６を介して入力される車両１００の各種状態を示す状態信号に基づいて、携帯電話機２０に対して送信すべき音声信号にノイズが含まれているか否かを判別する（ステップＳ２）。ステップＳ２において、音声信号にノイズが含まれていると判別されると（ステップＳ２：Ｙ）、制御部１８は、状態信号入力部１６を介して入力される各種状態信号に基づいて、ノイズの種類を判別する（ステップＳ３）。ここで、音声信号に含まれるノイズが複数のノイズ成分を含む場合は、ノイズに含まれる各ノイズ成分の種類を判別する。   Hereinafter, operations related to setting of parameter values and signal processing at the time of audio signal transmission will be described with reference to FIG. When a wireless communication connection is established between the in-vehicle device 10 and the mobile phone 20 and a hands-free call is started, the control unit 18 first collects sound by the sound collection device 30 via the audio signal input unit 12. It is determined whether or not an audio signal based on the audio in the vehicle 100 is input (step S1). Here, if it is determined that an audio signal is input from the sound collection device 30 via the audio signal input unit 12 (step S1: Y), the control unit 18 then passes through the status signal input unit 16. Whether or not noise is included in the audio signal to be transmitted to the mobile phone 20 is determined based on the state signals indicating the various states of the vehicle 100 input in step S2. When it is determined in step S2 that the audio signal includes noise (step S2: Y), the control unit 18 determines whether noise has been generated based on various state signals input via the state signal input unit 16. The type is determined (step S3). Here, when the noise included in the audio signal includes a plurality of noise components, the type of each noise component included in the noise is determined.

次に、制御部１８は、ノイズの種類又はノイズ成分の組み合わせに変化があったか否かを判別する（ステップＳ４）。ここで、音声信号が初めて入力された場合は、ノイズ種類の変化があった（ステップＳ４：Ｙ）ものとして次のステップに進む。
ステップＳ４において、ノイズの種類又はノイズ成分の組み合わせに変化があったと判別された場合（ステップＳ４：Ｙ）、次に、制御部１８は、パラメータ設定テーブルを参照して、ノイズの種類又はノイズ成分の組み合わせに応じたパラメータ情報を読み出して信号処理部１５において用いるパラメータ値をノイズ量に基づいて設定する（ステップＳ５）。但し、ノイズ量は、制御部１８において、状態信号に基づいて演算により求めることができる。 Next, the control unit 18 determines whether or not there is a change in the type of noise or the combination of noise components (step S4). Here, when an audio signal is input for the first time, it is assumed that there has been a change in noise type (step S4: Y), and the process proceeds to the next step.
If it is determined in step S4 that there has been a change in the type of noise or the combination of noise components (step S4: Y), the control unit 18 then refers to the parameter setting table and refers to the type of noise or noise component. The parameter information corresponding to the combination is read and the parameter value used in the signal processing unit 15 is set based on the amount of noise (step S5). However, the amount of noise can be obtained by calculation based on the state signal in the control unit 18.

パラメータ値の設定が終了すると（ステップＳ６：Ｙ）、制御部１８は、設定されたパラメータ値に基づいて、信号処理部１５により音声信号に対して信号処理が施されるように制御する（ステップＳ７）。そして、音声信号の入力が終了（ステップＳ８：Ｙ）するまでの間、上記処理を繰り返し行う。この際、ステップＳ４において、音声信号に含まれるノイズの種類又はノイズ成分の組み合わせが変化したと判別された場合（ステップＳ４：Ｙ）には、変化後のノイズの種類又はノイズ成分の組み合わせに応じたパラメータを変化後のノイズ量に応じて新たなパラメータ値に設定するまでの間は、変化前に設定されたパラメータ値に基づいて、信号処理部１５に音声信号に対して信号処理を行わせる。また、ステップＳ４において、ノイズの種類又はノイズ成分の組み合わせに変化がないと判別された場合（ステップＳ４：Ｎ）、既に設定されているパラメータ値に基づいて、信号処理部１５に音声信号に対して信号処理を行わせる。
但し、信号処理部１５により信号処理が施された音声信号は、近距離無線通信部１１を介して所定の通信プロトコルに従って携帯電話機２０に対して送信される。 When the parameter value setting is completed (step S6: Y), the control unit 18 controls the signal processing unit 15 to perform signal processing on the audio signal based on the set parameter value (step S6). S7). The above process is repeated until the input of the audio signal is completed (step S8: Y). At this time, if it is determined in step S4 that the type of noise or the combination of noise components included in the audio signal has changed (step S4: Y), depending on the type of noise or the combination of noise components after the change. Until the parameter is set to a new parameter value according to the noise amount after the change, the signal processing unit 15 is caused to perform signal processing on the audio signal based on the parameter value set before the change. . If it is determined in step S4 that there is no change in the type of noise or the combination of the noise components (step S4: N), the signal processing unit 15 applies an audio signal to the audio signal based on the already set parameter value. Signal processing.
However, the audio signal subjected to the signal processing by the signal processing unit 15 is transmitted to the mobile phone 20 through the short-range wireless communication unit 11 according to a predetermined communication protocol.

また、携帯電話機２０から近距離無線通信部１１を介して入力された音声信号に対して信号処理を施す際には、上記と同様に、状態信号入力部１６を介して入力される車両１００の各種状態を示す状態信号に基づいて、制御部１８は、車両１００内のノイズの有無をノイズの種類毎に判別し、記憶部１７に記憶されたパラメータ設定テーブルを参照して、車両１００内のノイズの種類又はノイズ成分の組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定して、当該パラメータ値に基づいて、信号処理部１５に信号処理を施させ、信号処理後の音声信号を音声信号出力部１４を介して拡声装置５０から車両１００内に拡声させるように制御する。   When performing signal processing on the audio signal input from the mobile phone 20 via the short-range wireless communication unit 11, the vehicle 100 input via the status signal input unit 16 is the same as described above. Based on the state signals indicating various states, the control unit 18 determines the presence / absence of noise in the vehicle 100 for each type of noise, and refers to the parameter setting table stored in the storage unit 17 to determine whether there is noise in the vehicle 100. A parameter corresponding to the type of noise or a combination of noise components is set to a parameter value corresponding to the amount of noise, and based on the parameter value, the signal processing unit 15 performs signal processing, and the audio signal after signal processing is processed. Control is performed so that the sound is amplified from the loudspeaker 50 into the vehicle 100 via the audio signal output unit 14.

同様に、音源装置４０から音響信号入力部１３を介して入力された音響信号についても、拡声装置５０から車両１００内に拡声させる際に、状態信号入力部１６を介して入力される車両１００の各種状態を示す状態信号に基づいて、制御部１８は、車両１００内のノイズの有無をノイズの種類毎に判別し、記憶部１７に記憶されたパラメータ設定テーブルを参照して、車両１００内のノイズの種類又はノイズ成分の組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定して、当該パラメータ値に基づいて、信号処理部１５に信号処理を施させ、信号処理後の音響信号を音声信号出力部１４を介して拡声装置５０から車両１００内に拡声させるように制御する。   Similarly, the sound signal input from the sound source device 40 via the sound signal input unit 13 is also input to the vehicle 100 input via the state signal input unit 16 when the sound signal is amplified from the sound expansion device 50 into the vehicle 100. Based on the state signals indicating various states, the control unit 18 determines the presence / absence of noise in the vehicle 100 for each type of noise, and refers to the parameter setting table stored in the storage unit 17 to determine whether there is noise in the vehicle 100. A parameter corresponding to the type of noise or a combination of noise components is set to a parameter value corresponding to the amount of noise, and based on the parameter value, the signal processing unit 15 performs signal processing, and the acoustic signal after signal processing is Control is performed so that the sound is amplified from the loudspeaker 50 into the vehicle 100 via the audio signal output unit 14.

以上説明した本実施の形態によれば、車両１００内で収音装置３０により収音された音声に基づく音声信号が音声信号入力部１２を介して音声信号処理装置としての車載機器１０に入力される。信号処理部１５では、この音声信号に対して、制御部１８により、設定されたパラメータ値に基づいて、音声信号に含まれるノイズを除去すべく信号処理を施す。この際、制御部１８は、パラメータ値の設定に際して、状態信号入力部１６を介して入力された車両１００の状態を示す各種状態信号に基づき、音声信号に含まれるノイズの有無をノイズの種類毎に判別する。また、制御部１８は、記憶部１７に記憶されたパラメータ設定テーブルを参照して、ノイズの種類又はノイズ成分の組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定して、当該パラメータ値に基づいて、信号処理部１５に信号処理を施させるように制御する。従って、車両１００内で収音された音声信号に含まれるノイズの種類が車両１００の走行／停止等に伴って変動した場合であっても、ノイズの種類又はノイズ成分の組み合わせとノイズの量に応じて適切に音声信号処理を施すことができる。すなわち、車両１００の走行音に起因するノイズと、空調音に起因するノイズとでは、ノイズの特性が異なるため、本実施の形態では、それぞれノイズの特性に応じたパラメータを用いて、ノイズ量に応じたパラメータ値を設定することにより、所望の音質に調整することができる。   According to the present embodiment described above, an audio signal based on the sound collected by the sound collection device 30 in the vehicle 100 is input to the in-vehicle device 10 as the audio signal processing device via the audio signal input unit 12. The In the signal processing unit 15, the control unit 18 performs signal processing to remove noise included in the audio signal based on the set parameter value by the control unit 18. At this time, when setting the parameter value, the control unit 18 determines the presence or absence of noise included in the audio signal based on various state signals indicating the state of the vehicle 100 input via the state signal input unit 16 for each type of noise. To determine. Further, the control unit 18 refers to the parameter setting table stored in the storage unit 17, sets a parameter according to the noise type or the combination of noise components to a parameter value according to the noise amount, and sets the parameter value Based on the above, control is performed so that the signal processing unit 15 performs signal processing. Therefore, even if the type of noise included in the audio signal collected in the vehicle 100 varies as the vehicle 100 travels / stops, the noise type or combination of noise components and the amount of noise Accordingly, the audio signal processing can be appropriately performed. That is, since noise characteristics are different between noise caused by running sound of vehicle 100 and noise caused by air-conditioning sound, in the present embodiment, the noise amount is set using parameters corresponding to the noise characteristics. By setting a corresponding parameter value, it is possible to adjust to a desired sound quality.

また、本実施の形態では、状態信号入力部１６に、走行状態信号、空調運転状態信号、ワイパー状態信号、窓開閉状態信号等の車両１００の各種状態を示す状態信号の入力を受ける構成としており、これらの状態信号に基づいて、制御部１８は、ノイズの有無、ノイズの種類あるいは複数のノイズ成分が含まれる場合にはその組み合わせなどを判別することができ、ノイズ量を演算して求めることができる。したがって、車両１００の走行に起因するノイズと、空気調和装置の空気調和運転に起因するノイズ、風切り音に起因するノイズ、ワイパーの動作に起因するノイズ又は雨音に起因するノイズなどを判別して、それぞれのノイズ量に応じて適切なパラメータ値を設定することができる。   In the present embodiment, the state signal input unit 16 is configured to receive input of state signals indicating various states of the vehicle 100 such as a traveling state signal, an air conditioning operation state signal, a wiper state signal, and a window opening / closing state signal. Based on these state signals, the control unit 18 can determine the presence / absence of noise, the type of noise, or a combination of a plurality of noise components, and the like, and calculate and obtain the amount of noise. Can do. Therefore, it is possible to discriminate between noise caused by running of the vehicle 100, noise caused by air conditioning operation of the air conditioner, noise caused by wind noise, noise caused by wiper operation, noise caused by rain sound, and the like. Therefore, an appropriate parameter value can be set according to each noise amount.

また、制御部１８は、信号処理の際に信号処理部１５において用いるパラメータ値をノイズの種類やノイズの変化の種類に応じて切り換える際に、新たなパラメータ値を設定するまでの間は、変化前に設定されたパラメータ値に基づいて、信号処理部１５に信号処理を施させるので、ノイズの種類の変化やノイズ成分の組み合わせの変化に応じてリアルタイムにパラメータ値を変更する場合に比較して、異音が発生する等の不具合が生じるのを防ぐことができる。すなわち、ノイズの種類の変化やノイズ成分の組み合わせの変化に応じて、直ちに、パラメータ値の設定を変更すると、通話品質が安定するまで一定時間を要する。また、ノイズ量を計算する際に収束時間を要し、異音が発生する場合がある。しかしながら、本実施の形態では、上述のように、パラメータ値を新たに設定する際に、新たなパラメータ値が設定（演算）されるまでの間は、ノイズ種類等が変化する前に設定されたパラメータ値を用いる構成としているので、上記異音の発生等の不具合が生じるのを防止することができる。   The control unit 18 changes the parameter value used in the signal processing unit 15 during signal processing according to the type of noise or the type of change in noise until a new parameter value is set. Since the signal processing unit 15 performs signal processing based on the previously set parameter value, compared with the case where the parameter value is changed in real time according to the change in the type of noise or the change in the combination of noise components. It is possible to prevent the occurrence of problems such as abnormal noise. That is, if the parameter value setting is changed immediately in response to a change in the type of noise or a change in the combination of noise components, a certain time is required until the call quality is stabilized. In addition, when calculating the amount of noise, a convergence time is required, and abnormal noise may occur. However, in the present embodiment, as described above, when a new parameter value is set, until the new parameter value is set (calculated), it is set before the noise type or the like changes. Since the parameter value is used, it is possible to prevent problems such as the occurrence of abnormal noise.

更に、音声信号に含まれるノイズを周波数特性と分析して、ノイズ成分を判定し、ノイズ成分を除去するように信号処理を施す場合と比較して、状態信号入力部１６を介して入力される状態信号に基づいて、予め、音声信号に含まれ得るノイズ成分の周波数特性やノイズ量等を判定することができるので、信号処理時に要する演算を簡易にすることができ、迅速にノイズを除去することができる。   Furthermore, the noise contained in the audio signal is analyzed with the frequency characteristic, the noise component is determined, and compared with the case where signal processing is performed so as to remove the noise component, the noise signal is input via the state signal input unit 16. Based on the status signal, it is possible to determine in advance the frequency characteristics of noise components that can be included in the audio signal, the amount of noise, etc., so that calculations required during signal processing can be simplified and noise can be quickly removed. be able to.

以上、説明した実施の形態は本発明の一態様であり、本発明の趣旨を逸脱しない範囲において適宜変更可能であるのは勿論である。例えば、上記実施の形態の車載機器１０では収音装置３０や拡声装置５０が接続される構成としたが、車載機器１０が備えていてもよいのは勿論である。また、車載機器１０が近距離無線通信部１１、音声信号入力部１２、音響信号入力部１３、音声信号出力部１４を備える構成としたが、音声信号処理装置としては、これらを外部構成としてもよいのは勿論である。   The embodiment described above is one aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention. For example, although the sound collecting device 30 and the loudspeaker 50 are connected in the in-vehicle device 10 of the above embodiment, the in-vehicle device 10 may be provided. Moreover, although the in-vehicle device 10 is configured to include the short-range wireless communication unit 11, the audio signal input unit 12, the acoustic signal input unit 13, and the audio signal output unit 14, the audio signal processing device may be configured as an external configuration. Of course it is good.

本発明の実施の形態に係る車載機器（音声信号処理装置、ハンズフリー通話装置）の使用の態様を示す図である。It is a figure which shows the aspect of use of the vehicle equipment (audio | voice signal processing apparatus, hands-free call apparatus) which concerns on embodiment of this invention. 車載機器の機能的構成を示すブロック図である。It is a block diagram which shows the functional structure of vehicle equipment. パラメータ設定テーブルの構成を示す図である。It is a figure which shows the structure of a parameter setting table. 車載機器の動作を示すフローチャートである。It is a flowchart which shows operation | movement of vehicle equipment.

符号の説明Explanation of symbols

１０ 車載機器
１１ 近距離無線通信部
１２ 音声信号入力部
１３ 音響信号入力部
１４ 音声信号出力部
１５ 信号処理部
１６ 状態信号入力部
１７ 記憶部
１７ａ パラメータ設定テーブル格納領域
１８ 制御部
２０ 携帯電話機（携帯電話端末）
３０ 収音装置
４０ 音源装置
５０ 拡声装置
１００ 車両 DESCRIPTION OF SYMBOLS 10 In-vehicle apparatus 11 Near field communication part 12 Audio | voice signal input part 13 Acoustic signal input part 14 Audio | voice signal output part 15 Signal processing part 16 State signal input part 17 Memory | storage part 17a Parameter setting table storage area 18 Control part 20 Cellular phone (portable) Phone terminal)
DESCRIPTION OF SYMBOLS 30 Sound collecting device 40 Sound source device 50 Loudspeaker 100 Vehicle

Claims (9)

車両内で収音された音声に基づく音声信号が入力される音声信号入力部と、
設定されたパラメータ値に基づいて、前記音声信号に含まれるノイズを除去すべく前記音声信号に対して信号処理を施す信号処理部と、
外部から前記車両の状態を示す状態信号が入力される状態信号入力部と、
前記状態信号に基づき、前記音声信号に含まれるノイズの有無をノイズの種類毎に判別するノイズ判別部と、
各ノイズの種類毎に前記信号処理の際に用いるパラメータを対応付けたパラメータ設定テーブルを記憶する記憶部と、
前記ノイズ判別部により判別されたノイズの種類又はノイズ成分の組み合わせに応じて、前記パラメータ設定テーブルを参照して、前記ノイズの種類又は組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定して、当該パラメータ値に基づいて、前記信号処理部に前記信号処理を施させるように制御する制御部と、
を備えることを特徴とする音声信号処理装置。 An audio signal input unit to which an audio signal based on audio collected in the vehicle is input;
A signal processing unit that performs signal processing on the audio signal to remove noise included in the audio signal based on the set parameter value;
A state signal input unit to which a state signal indicating the state of the vehicle is input from the outside;
Based on the state signal, a noise determination unit that determines the presence or absence of noise included in the audio signal for each type of noise;
A storage unit for storing a parameter setting table in which parameters used in the signal processing are associated with each noise type;
Refer to the parameter setting table according to the type of noise or the combination of noise components determined by the noise determination unit, and set the parameter according to the type or combination of noise to a parameter value according to the amount of noise. A control unit that controls the signal processing unit to perform the signal processing based on the parameter value;
An audio signal processing device comprising: 請求項１記載の音声信号処理装置において、
前記状態信号入力部には、前記状態信号として、少なくとも前記車両の走行状態を示す状態信号と、前記車両内に設置された空気調和装置の空気調和運転状態を示す状態信号との入力を受け、
前記ノイズの種類には、前記車両の走行に起因するノイズと、前記空気調和装置の空気調和運転に起因するノイズとを含むこと、
を特徴とする音声信号処理装置。 The audio signal processing device according to claim 1,
The state signal input unit receives, as the state signal, at least a state signal indicating a traveling state of the vehicle and a state signal indicating an air conditioning operation state of an air conditioner installed in the vehicle,
The types of noise include noise caused by running of the vehicle and noise caused by air conditioning operation of the air conditioner,
An audio signal processing device. 請求項１又は２記載の音声信号処理装置において、
前記状態信号入力部には、前記状態信号として、窓の開閉量を示す信号の入力を受け、
前記ノイズの種類には、風切り音に起因するノイズを含むこと、
を特徴とする音声信号処理装置。 The audio signal processing device according to claim 1 or 2,
The state signal input unit receives a signal indicating the opening / closing amount of the window as the state signal,
The noise type includes noise caused by wind noise,
An audio signal processing device. 請求項１〜３のいずれか一項に記載の音声信号処理装置において、
前記状態信号入力部には、前記状態信号として、ワイパー速度を示す信号の入力を受け、
前記ノイズの種類には、ワイパーの動作に起因するノイズ又は雨音に起因するノイズを含むこと、
を特徴とする音声信号処理装置。 In the audio signal processing device according to any one of claims 1 to 3,
The state signal input unit receives a signal indicating a wiper speed as the state signal,
The type of noise includes noise caused by wiper operation or noise caused by rain sound,
An audio signal processing device. 請求項１〜４のいずれか一項に記載の音声信号処理装置において、
前記制御部は、前記音声信号に含まれるノイズの種類又はノイズ成分の組み合わせが変化した場合、変化後のノイズの種類又はノイズ成分の組み合わせに応じたパラメータを変化後のノイズ量に応じて新たなパラメータ値に設定するまでの間は、変化前に設定されたパラメータ値に基づいて、前記信号処理部に前記信号処理を施させること、
を特徴とする音声信号処理装置。 In the audio signal processing device according to any one of claims 1 to 4,
When the noise type or the combination of noise components included in the audio signal is changed, the control unit sets a new parameter according to the changed noise type or the noise component combination according to the changed noise amount. Until the parameter value is set, based on the parameter value set before the change, the signal processing unit is subjected to the signal processing,
An audio signal processing device. 音源装置から車両内に拡声するための音響信号が入力される音響信号入力部と、
設定されたパラメータ値に基づいて、前記音響信号に対して音質を調整すべく信号処理を施す信号処理部と、
外部から前記車両の状態を示す状態信号が入力される状態信号入力部と、
前記状態信号に基づき、車両内のノイズの有無をノイズの種類毎に判別するノイズ判別部と、
各ノイズの種類毎に前記信号処理の際に用いるパラメータを対応付けたパラメータ設定テーブルを記憶する記憶部と、
前記ノイズ判別部により判別されたノイズの種類又はノイズ成分の組み合わせに応じて、前記パラメータ設定テーブルを参照して、前記ノイズの種類又は組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定して、当該パラメータ値に基づいて、前記信号処理部に前記信号処理を施させるように制御する制御部と、
を備えることを特徴とする音声信号処理装置。 An acoustic signal input unit for inputting an acoustic signal for sounding into the vehicle from the sound source device;
A signal processing unit for performing signal processing to adjust the sound quality of the acoustic signal based on the set parameter value;
A state signal input unit to which a state signal indicating the state of the vehicle is input from the outside;
Based on the state signal, a noise determination unit that determines the presence or absence of noise in the vehicle for each type of noise,
A storage unit for storing a parameter setting table in which parameters used in the signal processing are associated with each noise type;
Refer to the parameter setting table according to the type of noise or the combination of noise components determined by the noise determination unit, and set the parameter according to the type or combination of noise to a parameter value according to the amount of noise. A control unit that controls the signal processing unit to perform the signal processing based on the parameter value;
An audio signal processing device comprising: 音声を収音して音声信号に変換する収音部と、携帯電話端末と所定の通信プロトコルに従って、前記音声信号を送信するとともに前記携帯電話端末から音声信号を受信する通信部と、前記通信部において受信した音声信号を出力する出力部とを備え、前記携帯電話端末をハンズフリーで通話可能とするハンズフリー通話装置において、
設定されたパラメータ値に基づいて、前記音声信号に対して音質を調整すべく信号処理を施す信号処理部と、
外部から前記車両の状態を示す状態信号が入力される状態信号入力部と、
前記状態信号に基づき、前記車両内のノイズの有無をノイズの種類毎に判別するノイズ判別部と、
各ノイズの種類毎に前記信号処理の際に用いるパラメータを対応付けたパラメータ設定テーブルを記憶する記憶部と、
前記ノイズ判別部により判別されたノイズの種類又はノイズ成分の組み合わせに応じて、前記パラメータ設定テーブルを参照して、前記ノイズの種類又は組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定して、当該パラメータ値に基づいて、前記信号処理部に前記信号処理を施させるように制御する制御部と、
を備えることを特徴とするハンズフリー通話装置。 A sound collection unit that collects sound and converts it into an audio signal; a communication unit that transmits the audio signal and receives the audio signal from the mobile phone terminal according to a predetermined communication protocol with the mobile phone terminal; and the communication unit In the hands-free call device that includes the output unit that outputs the audio signal received in the above, and enables the hands-free call on the mobile phone terminal,
A signal processing unit that performs signal processing to adjust sound quality based on the set parameter value;
A state signal input unit to which a state signal indicating the state of the vehicle is input from the outside;
Based on the state signal, a noise determination unit that determines the presence or absence of noise in the vehicle for each type of noise;
A storage unit for storing a parameter setting table in which parameters used in the signal processing are associated with each noise type;
Refer to the parameter setting table according to the type of noise or the combination of noise components determined by the noise determination unit, and set the parameter according to the type or combination of noise to a parameter value according to the amount of noise. A control unit that controls the signal processing unit to perform the signal processing based on the parameter value;
A hands-free communication device comprising: 車両内で収音された音声に基づく音声信号が入力される音声信号入力部と、設定されたパラメータ値に基づいて、前記音声信号に対して信号処理を施す信号処理部と、外部から前記車両の状態を示す状態信号が入力される状態信号入力部と、各ノイズの種類毎に前記信号処理の際に用いるパラメータを対応付けたパラメータ設定テーブルを記憶する記憶部と、を備えた音声信号処理装置を用いて前記音声信号に含まれるノイズを除去すべく前記音声信号に対して信号処理を施す音声信号処理方法であって、
前記状態信号に基づき、前記音声信号に含まれるノイズの有無をノイズの種類毎に判別する過程と、
前記ノイズ判別部により判別されたノイズの種類又はノイズ成分の組み合わせに応じて、前記パラメータ設定テーブルを参照して、前記ノイズの種類又は組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定する過程と、
当該パラメータ値に基づいて、前記信号処理部に前記信号処理を施させる過程と、
を備えることを特徴とする音声信号処理方法。 An audio signal input unit that receives an audio signal based on audio collected in the vehicle, a signal processing unit that performs signal processing on the audio signal based on a set parameter value, and the vehicle from the outside Audio signal processing comprising: a state signal input unit to which a state signal indicating the state of the signal is input; and a storage unit that stores a parameter setting table in which parameters used in the signal processing are associated with each noise type An audio signal processing method for performing signal processing on the audio signal to remove noise included in the audio signal using an apparatus,
Based on the status signal, a process of determining the presence or absence of noise included in the audio signal for each type of noise;
According to the type of noise or the combination of noise components determined by the noise determination unit, the parameter setting table is referred to and a parameter corresponding to the type or combination of noise is set to a parameter value corresponding to the amount of noise. Process,
A process of causing the signal processing unit to perform the signal processing based on the parameter value;
An audio signal processing method comprising: 車両内で収音された音声に基づく音声信号が入力される音声信号入力部と、設定されたパラメータ値に基づいて、前記音声信号に含まれるノイズを除去すべく前記音声信号に対して信号処理を施す信号処理部と、外部から前記車両の状態を示す状態信号が入力される状態信号入力部と、各ノイズの種類毎に前記信号処理の際に用いるパラメータを対応付けたパラメータ設定テーブルを記憶する記憶部と、を備えた音声信号処理装置をコンピュータを用いて制御するための制御プログラムであって、
前記状態信号に基づき、前記音声信号に含まれるノイズの有無をノイズの種類毎に判別させ、
前記ノイズ判別部により判別されたノイズの種類又はノイズ成分の組み合わせに応じて、前記パラメータ設定テーブルを参照して、前記ノイズの種類又は組み合わせに応じたパラメータをノイズ量に応じたパラメータ値に設定させ、
当該パラメータ値に基づいて、前記信号処理部に前記信号処理を施させること、
を特徴とする制御プログラム。 An audio signal input unit to which an audio signal based on the audio collected in the vehicle is input, and signal processing on the audio signal to remove noise included in the audio signal based on a set parameter value A signal processing unit for performing the processing, a state signal input unit for inputting a state signal indicating the state of the vehicle from the outside, and a parameter setting table in which parameters used for the signal processing are associated with each noise type A control program for controlling an audio signal processing device including a storage unit using a computer,
Based on the state signal, the presence or absence of noise included in the audio signal is determined for each type of noise,
According to the type of noise or the combination of noise components determined by the noise determination unit, the parameter setting table is referred to and a parameter corresponding to the noise type or combination is set to a parameter value corresponding to the amount of noise. ,
Causing the signal processing unit to perform the signal processing based on the parameter value;
A control program characterized by
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