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| <title>3.5 毫米耳机插孔：设备规范</title> |
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| <p>为了实现与 <a href="plug-headset-spec.html">3.5 毫米插头耳机规范</a>的兼容性，配备 4 导体 3.5 毫米音频插孔的设备必须符合以下规范。有关 Android 兼容性要求，请参阅 <a href="/compatibility/android-cdd.html#7_8_audio">Android CDD</a> 的“模拟音频端口”部分。<em></em></p> |
| |
| <h2 id="headset_jack_functions">功能</h2> |
| |
| <table> |
| <tbody><tr> |
| <th>功能</th> |
| <th>设备支持</th> |
| </tr> |
| <tr> |
| <td>立体声音频输出</td> |
| <td>必需</td> |
| </tr> |
| <tr> |
| <td>音频输入（麦克风）</td> |
| <td>必需</td> |
| </tr> |
| <tr> |
| <td>接地</td> |
| <td>必需</td> |
| </tr> |
| </tbody></table> |
| |
| <h2 id="software_mapping">软件映射</h2> |
| |
| <table> |
| <tbody><tr> |
| <th style="width:33%">功能</th> |
| <th style="width:33%">设备支持</th> |
| <th style="width:33%">说明</th> |
| </tr> |
| <tr> |
| <td>功能 A 控件事件</td> |
| <td>必需</td> |
| <td>输入事件：<code>KEY_MEDIA</code> |
| <p>Android 按键：<code>KEYCODE_HEADSETHOOK<code></code></code></p></td> |
| </tr> |
| <tr> |
| <td>功能 D 控件事件</td> |
| <td>必需</td> |
| <td>输入事件：<code>KEY_VOICECOMMAND</code> |
| <p>Android 按键：<code>KEYCODE_VOICE_ASSIST</code></p></td> |
| </tr> |
| <tr> |
| <td>功能 B 控件事件</td> |
| <td>必需</td> |
| <td>输入事件：<code>KEY_VOLUMEUP</code> |
| <p>Android 按键：<code>VOLUME_UP</code></p></td> |
| </tr> |
| <tr> |
| <td>功能 C 控件事件</td> |
| <td>必需</td> |
| <td>输入事件：<code>KEY_VOLUMEDOWN</code> |
| <p>Android 按键：<code>VOLUME_DOWN</code></p></td> |
| </tr> |
| <tr> |
| <td>耳机插入检测</td> |
| <td>必需</td> |
| <td>输入事件：<code>SW_JACK_PHYSICAL_INSERT 7</code></td> |
| </tr> |
| <tr> |
| <td rowspan="2">耳机类型检测</td> |
| <td>麦克风</td> |
| <td>输入事件：<code>SW_MICROPHONE_INSERT 4</code></td> |
| </tr> |
| <tr> |
| <td>无麦克风</td> |
| <td>输入事件：<code>SW_HEADPHONE_INSERT 2</code></td> |
| </tr> |
| <tr> |
| <td rowspan="2">耳机扬声器阻抗</td> |
| <td>必需耳机（低）</td> |
| <td>故障模式用于指示耳机开启相关限制</td> |
| </tr> |
| <tr> |
| <td>必需线路输入（高）</td> |
| <td>输入事件：<code>SW_LINEOUT_INSERT 6</code></td> |
| </tr> |
| </tbody></table> |
| |
| <h2 id="mechanical11">机械</h2> |
| |
| <table> |
| <tbody><tr> |
| <th style="width:33%">功能</th> |
| <th style="width:33%">设备支持</th> |
| <th style="width:33%">说明</th> |
| </tr> |
| <tr> |
| <td>4 导体 3.5 毫米插孔</td> |
| <td>必需</td> |
| <td></td> |
| </tr> |
| <tr> |
| <td>CTIA 引脚顺序 (LRGM)</td> |
| <td>必需</td> |
| <td>兼容 3 脚插头和单声道插头</td> |
| </tr> |
| <tr> |
| <td>OMTP 引脚顺序 (LRMG)</td> |
| <td>可选，但强烈建议支持</td> |
| <td></td> |
| </tr> |
| <tr> |
| <td>耳机检测序列</td> |
| <td>必需</td> |
| <td>仅当插头上的所有触点接触其相关部分之后才触发插头插入通知（这样可防止因插入缓慢而导致耳机检测不可靠）。</td> |
| </tr> |
| </tbody></table> |
| |
| <h2 id="electrical12">电气</h2> |
| |
| <h3 id="general">概述</h3> |
| |
| <table> |
| <tbody><tr> |
| <th style="width:33%">功能</th> |
| <th style="width:33%">设备支持</th> |
| <th style="width:33%">备注</th> |
| </tr> |
| <tr> |
| <td>最大输出电压驱动</td> |
| <td>150 毫伏</td> |
| <td>>= 150 毫伏（电阻为 32 欧姆）<p>测试条件：EN50332-2</p></td> |
| </tr> |
| <tr> |
| <td>麦克风偏置电阻</td> |
| <td>必需</td> |
| <td>可以灵活选择所使用的检测方法和麦克风偏置电阻器。需要检测以下指定的所有按钮电阻值范围，并将其与各自的功能相关联</td> |
| </tr> |
| <tr> |
| <td>麦克风偏置电压</td> |
| <td>1.8 伏 - 2.9 伏</td> |
| <td>可保证与通用麦克风咪头的兼容性。</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="function_impedance_and_threshold_detection">功能阻抗和阈值检测</h3> |
| |
| <p>设备必须检测配件上的以下电阻梯形。按照上一部分展示的标准电路图（参考耳机测试电路）对配件进行测试，当通过 2.2 千欧电阻器对按钮施加 2.2 伏麦克风偏置电压时，将测量从 MIC 终端到 GND 的总阻抗。这是与按钮检测电路（具有与按钮电阻器并联的麦克风）相同的有效电阻。</p> |
| |
| <table> |
| <tbody><tr> |
| <th style="width:40%">按钮阻抗级别</th> |
| <th style="width:20%">设备支持</th> |
| <th style="width:40%">备注</th> |
| </tr> |
| <tr> |
| <td>不超过 70 欧姆</td> |
| <td>必需</td> |
| <td>[功能 A]</td> |
| </tr> |
| <tr> |
| <td>110 - 180 欧姆</td> |
| <td>必需</td> |
| <td>[功能 D]</td> |
| </tr> |
| <tr> |
| <td>210 - 290 欧姆</td> |
| <td>必需</td> |
| <td>[功能 B]</td> |
| </tr> |
| <tr> |
| <td>360 - 680 欧姆</td> |
| <td>必需</td> |
| <td>[功能 C]</td> |
| </tr> |
| </tbody></table> |
| |
| <table> |
| <tbody><tr> |
| <th style="width:40%">耳机扬声器阻抗级别</th> |
| <th style="width:20%">设备支持</th> |
| <th style="width:40%">备注</th> |
| </tr> |
| <tr> |
| <td>低阈值检测</td> |
| <td>必需</td> |
| <td>耳机（低）< 1 千欧</td> |
| </tr> |
| <tr> |
| <td>高阈值检测</td> |
| <td>必需</td> |
| <td>线路输入（高）> 5 千欧</td> |
| </tr> |
| </tbody></table> |
| |
| <table> |
| <tbody><tr> |
| <th style="width:40%">4 段插头检测电阻（第 3 段与第 4 段之间）</th> |
| <th style="width:20%">设备支持</th> |
| <th style="width:40%">备注</th> |
| </tr> |
| <tr> |
| <td>4 段插头阈值</td> |
| <td>必需</td> |
| <td>电阻 >= 100 欧姆</td> |
| </tr> |
| <tr> |
| <td>3 段插头阈值</td> |
| <td>必需</td> |
| <td>电阻 < 100 欧姆</td> |
| </tr> |
| </tbody></table> |
| |
| </body></html> |
