JPWO2020039678A1 - ヘッドアップディスプレイ装置 - Google Patents
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Abstract
Description
音声入力部41には、車両に設置した各マイク40a〜dからの音声信号が入力し、初段のバンドパスフィルタ(BPF1)411では、低周波帯域と高周波帯域をカットし、全ての警告音が含まれる中間周波数帯域(例えば、400〜1000Hz)を通過させる。AD変換器412では、アナログ音声信号をデジタル信号に変換し、音声解析部42へ出力する。
S101:車両に搭載した4個のマイク40a〜dから、音声入力部41を介して周囲音の信号を入力する。
(a)は道路上での車両走行状態を示し、自車両80が矢印方向に走行している。このとき、対向車線の前方から緊急車両81がサイレン音81aを鳴らして接近した場合、また、後続車両82からクラクション音82aを鳴らされた場合である。自車両80に搭載したHUD1はこれらの警告音を検知すると、警告音を受けたことを映像化してアイコンで表示する。
(b1)は、自車両を示すアイコン90に、緊急車両81から受けたサイレン音を示すアイコン91を追加して表示した場合である。このときアイコン91の表示位置は、自車両のアイコン90に対しサイレン音を検知した右側前方の位置に表示する。
(b2)は、自車両を示すアイコン90とともに、後続車両82から受けたクラクション音を示すアイコン92を表示した場合である。アイコン92の表示位置は、自車両のアイコン90に対しクラクション音を検出した後方の位置に表示する。なお、サイレン音を示すアイコン91とクラクション音を示すアイコン92には異なるマークを用いることで、警告音の種類を区別して運転者に知らせるようにしている。
(b3)は、緊急車両81からのサイレン音と後続車両82からのクラクション音を同時に受けたとき、2つのアイコンを同時に表示した場合である。自車両のアイコン90の前方にはサイレン音を示すアイコン91を、後方にはクラクション音を示すアイコン92を同時に表示している。
(a)は、自車両を示すアイコン90を削除し、警告音のアイコン91,92のみを表示した場合である。HUDの表示領域全体を利用して警告音のアイコン91,92を領域の隅に表示して音源の方向を伝えることができる。
(b)は、警告音のアイコン91,92の表示位置を固定し、音源方向を文字等で表示した場合である。音源方向は、例えばF(前)、Re(後)、Ri(右)、L(左)といった文字を組み合わせて表記する。この場合、表示位置が固定されるので、表示スペースを節約できる。
(c)は、自車両のアイコン90とともに警告音のアイコン91,92を表示するが、音源方向は前後方向の表示のみとした場合である。この場合も表示位置が限定されるので、表示スペースを節約できる。
(a)は表示対象の優先度の設定例である。つまり、検知した警告音が複数存在するとき、どの警告音を優先させて表示するかを示すものである。優先させる表示数は1つ、あるいは2つ以内に制限するのが実用的である。この優先度の設定は例えば不揮発性メモリ23に記憶させておき、ECU21はこれを参照して前記図7の優先度の判定(S105)を行う。
警告音の音量については、同一種類の警告音であれば当然ながら音量の大きい方(より近い方)を優先させる。なお、サイレン音については音量が小さくても聞こえたら早く表示して、緊急車両が接近したときの備えをするのが好ましい。そして、サイレン音表示中にクラクション音を検知したら、直ちにクラクション音表示に切替えるようにする。
自車両の走行状態の観点では、走行中は停止中よりも優先度を高くする。なぜなら、走行中は停止中と比べて他車両との相対速度が増大し、より高いリアルタイム性が求められるからである。
2:車両、
3:ウィンドシールド、
4:車両情報、
9:虚像、
10:車両情報取得部、
20:制御部、
21:電子制御ユニット(ECU)、
30:映像表示装置、
40:マイク、
41:音声入力部、
42:音声解析部、
90:自車両を示すアイコン、
91,92,93:警告音を示すアイコン、
421:バンドパスフィルタ(BPF2)、
424:入力信号比較部。
Claims (5)
- 車両に搭載し、映像を投射することで運転者に対して前記車両の前方に虚像を表示するヘッドアップディスプレイ装置において、
前記車両の周囲音を集音するために前記車両に設置されたマイクからの音声信号を入力し、特定の警告音が含まれているかどうかを判定する音声解析部と、
投射する映像を生成する映像表示装置と、
前記音声解析部と前記映像表示装置を制御する制御部と、を備え、
前記制御部は、前記音声解析部の判定により前記特定の警告音が検知されたとき、前記映像表示装置に対し、投射する映像に検知した前記特定の警告音を示すアイコンを追加して表示させることを特徴とするヘッドアップディスプレイ装置。 - 請求項1に記載のヘッドアップディスプレイ装置において、
前記特定の警告音には、緊急車両から発せられたサイレン音と一般車両から発せられたクラクション音を含み、
前記音声解析部は、入力した音声信号の周波数を解析することで前記特定の警告音であるか否かを判定することを特徴とするヘッドアップディスプレイ装置。 - 請求項2に記載のヘッドアップディスプレイ装置において、
前記制御部は前記映像表示装置に対し、検知した前記特定の警告音の種類に応じて異なるアイコンを表示させることを特徴とするヘッドアップディスプレイ装置。 - 請求項2に記載のヘッドアップディスプレイ装置において、
前記車両には、前記マイクを複数個所に設置しておき、
前記音声解析部は、複数の前記マイクから入力した複数の音声信号の入力タイミング、または振幅レベルを比較して、検知した前記特定の警告音の方向を判定し、
前記制御部は前記映像表示装置に対し、検知した前記特定の警告音の方向に応じてアイコンの表示方法を変えて表示させることを特徴とするヘッドアップディスプレイ装置。 - 請求項2に記載のヘッドアップディスプレイ装置において、
前記特定の警告音は、その種類や発生状況に応じて表示する優先度を設定しておき、
前記制御部は、前記音声解析部により複数の前記特定の警告音が検知されたとき、設定された前記優先度に応じて前記映像表示装置にて表示するアイコンの数を制限することを特徴とするヘッドアップディスプレイ装置。
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