CN203721183U - 一种语音唤醒装置 - Google Patents
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Abstract
一种语音唤醒装置，位于蓝牙通信设备的免提组件（HF）端，包括：主控单元、语音采集单元、A/D转换器和语音识别单元；用于采集用户语音的语音采集单元输出端一路直接与待唤醒装置的主控单元的一个输入端相连，另一路依次通过A/D转换器、语音识别单元与主控单元的另一个输入端相连；主控单元的输出端分别与语音识别单元、A/D转换器的输入端相连，AD转换器将输入端的模拟声音信号转换为数字信号，并通过语音识别单元输出到主控单元。本实用新型能够用语音唤醒蓝牙通信设备，比如当命令词是“蓝牙语点”时，只需要对着设备的HF端说“蓝牙语点”，就可以唤醒语音识别模块并开始蓝牙通信。
Description
技术领域
本实用新型涉及一种语音唤醒装置，属于蓝牙通信技术和语音识别技术领域。
背景技术
本实用新型是基于蓝牙通信技术中的免提应用框架协议HFP，此协议中让蓝牙设备可以控制电话，如接听、挂断、拒接、语音拨号等，它定义了音频网关（AG）和免提组件（HF）两个角色。AG为音频输入输出的网关设备。典型的音频网关主要有蓝牙手机；HF是指可以收发音频并遥控AG的设备，典型的免提组件主要有蓝牙耳机和蓝牙车载免提设备。目前的蓝牙技术和语音识别的结合大多数将语音识别模块放在AG上，用户对HF发出语音指令，HF进行录音并对录音进行压缩编码处理，编码后的音频通过蓝牙通信协议发送到AG端，在AG端对音频进行解码恢复，再将恢复后的语音送入语音识别模块进行识别。然而语音识别功能通常都需要唤醒才能开始，目前的唤醒方式有按键唤醒和语音唤醒两种。当语音识别模块在AG端的时候，只能使用按键唤醒的方式。在车载环境下，使用按键唤醒方式意味着在驾驶时要分散注意力，并用手操作，这种情况会有很多安全隐患，但是如果可以使用语音唤醒，就可以解决这样的问题。
本实用新型内容
本实用新型技术解决问题：克服现有技术的不足，提供一种语音唤醒装置，能够用语音唤醒蓝牙通信设备，比如当命令词是“蓝牙语点”时，只需要对着设备的HF端说“蓝牙语点”，就可以唤醒语音识别模块并开始蓝牙通信。
本实用新型技术解决方案：一种语音唤醒装置，位于蓝牙通信设备的HF端，包括：主控单元1、语音采集单元2、A/D转换器3和语音识别单元4；用于采集用户语音的语音采集单元2输出端一路直接与待唤醒装置的主控单元1的一个输入端相连，另一路依次通过A/D转换器3、语音识别单元4与主控单元1的另一个输入端相连；主控单元1的输出端分别与语音识别单元4、A/D转换器3的输入端相连，AD转换器3将输入端的模拟声音信号转换为数字信号，并通过语音识别单元4输出到主控单元1。
所述语音采集单元2由用于采集用户语音的麦克风、音频放大器和比较器组成；麦克风的输出端与音频放大器的输入端相连，音频放大器的输出端分别与比较器和A/D转换器3的输出端相连。
本实用新型与现有技术相比的优点在于：本实用新型将语音识别模块放在HF端，并使用语音唤醒识别功能，不需要用手操作，提高了蓝牙在车载环境中的安全性。
附图说明
图1为本实用新型的电路框图；
图2为蓝牙通信设备构成框图；
图3为本实用新型的语音识别单元工作流程。
具体实施方式
如图1、2所示，本实用新型的一种语音唤醒装置，位于蓝牙通信设备的HF端，包括用于采集用户语音的语音采集单元2，其输出端一路直接与待唤醒装置的主控单元1的输入端相连，另一路依次通过A/D转换器3、语音识别单元4与主控单元1的输入端相连，另一路依次通过A/D转换器3、语音识别单元4与主控单元1的输入端相连，主控单元1的输出端分别与语音识别单元4、A/D转换器3的输入端相连，如图1所示。AD转换器3将输入端的模拟声音信号转换为数字信号，并通过语音识别单元4输出到主控单元1。
如图1所示，所述的语音采集单元2由用于采集用户语音的麦克风、音频放大器和比较器组成，麦克风的输出端与音频放大器的输入端相连，音频放大器的输出端分别与比较器和A/D转换器3的输出端相连。音频放大器将麦克风输出的音频信号进行放大；比较器具有特定的阈值，这个阈值可以根据不同设备、不同环境进行调节，比如在安静环境下可设为20分贝，在嘈杂环境下可设为40分贝。当比较器的输入电压即麦克风转换的声音信号高于阈值时，则比较器的输出端输出唤醒信号，将主控单元1进行唤醒，唤醒以后可以进行用语音识别模块进行操作。
如图1所示，本实用新型工作过程如下：
（1）语音采集单元2由用于采集用户语音的麦克风、音频放大器和比较器组成，麦克风的输出端与音频放大器的输入端相连，音频放大器的输出端分别与比较器和A/D转换器3的输出端相连；
（2）音频放大器将麦克风输出的音频信号进行放大；
（3）比较器具有特定的阈值，这个阈值可以根据不同设备、不同环境进行调节，当比较器的输入电压即麦克风转换的声音信号高于阈值时，则比较器的输出端输出唤醒信号；
（4）同时语音识别单元会对接收到的音频信号进行语义识别，如果通过语义识别，则也输出唤醒信号；
（5）主控单元1同时接收比较器和语音识别单元的唤醒信号后被唤醒。唤醒以后可以进行用语音识别模块进行操作。
如图3所示，本实用新型语音识别单元工作流程：
（1）说话人对着语音采集单元说话，说话内容为预设的唤醒命令词，语音采集单元将语音信号发送给语音识别单元；
（2）语音识别单元对语音进行语义识别，得出所识别出的文本，并与预设的命令词文本进行比对；
（3）如果与命令词匹配，则通过语义识别，输出唤醒信号；
如果与命令词不匹配，则不输出唤醒信号。
Claims (2)
1.一种语音唤醒装置，位于蓝牙通信设备的免提组件（HF）端，其特征在于包括：主控单元（1）、语音采集单元（2）、A/D转换器（3）和语音识别单元（4）；用于采集用户语音的语音采集单元（2）输出端一路直接与待唤醒装置的主控单元（1）的一个输入端相连，另一路依次通过A/D转换器（3）、语音识别单元（4）与主控单元（1）的另一个输入端相连；主控单元（1）的输出端分别与语音识别单元（4）、A/D转换器（3）的输入端相连。
2.根据权利要求1所述的语音唤醒装置，其特征在于：所述语音采集单元（2）由用于采集用户语音的麦克风、音频放大器和比较器组成；麦克风的输出端与音频放大器的输入端相连，音频放大器的输出端分别与比较器和A/D转换器（3）的输出端相连。
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