线路立体声/2 声道录音 [英] Line stereo/2-channel recording

问题描述

是否有任何 Android 设备支持通过线路输入进行多声道(立体声)录音?

Are there any Android devices available that support multi-channel (stereo) recording via line-in?

使用我测试过的设备(Nexus 4、HTC Buzz、摩托罗拉 Xoom ..)，可以设置 AudioFormat.CHANNEL_IN_STEREO，但我只收到一个活动频道.

With the devices I tested (Nexus 4, HTC Buzz, Motorola Xoom ..), it is possible to set AudioFormat.CHANNEL_IN_STEREO, but I only receive one active channel.

这是由于许可问题导致的 Android 的一般限制还是取决于制造商/硬件，即只有一个 A/D 转换器用于输入或某些类似的?

Is this a gerneral limitation of Android due to licensing issues or is this depending on the manufacturer/hardware, i.e. there is only one A/D converter for input or some such?

对此主题有任何经验、想法或想法吗?

Any experiences, thoughts or ideas on this topic?

推荐答案

是否有任何 Android 设备支持通过线路输入进行多声道(立体声)录音?

Are there any Android devices available that support multi-channel (stereo) recording via line-in?

对于大多数出厂配备 Android 的智能手机和平板电脑，有一个令人不快的答案:否.

Concerning most smartphones and tablets factory-equipped with Android there is an unpleasant answer: No.

为什么不呢?因为这些设备(顺便说一句，还有所有 iPhone)使用 4 针 TRRS-3.5 毫米插头将耳机和/或麦克风连接到设备.四个引脚分别用于T)左扬声器，R1)右扬声器，R2)扬声器和麦克风的接地，最后是S)单声道麦克风.

Why not? Because these devices (and BTW also all iPhones) use the 4pin TRRS-3.5mm-plug to connect headphones and/or microphone to the device. The four pins are used for T) left speaker, R1) right speaker, R2) ground for speaker and microphone, and finally S) monophonic microphone.

更新: 当我在 2013 年 12 月补充说TRRRS(我建议称之为T3RS")插头的发明将解决问题"时，我不知道索尼是已经在努力，并于 2014 年 2 月推出了带有 T3RS 插头的STM-10"立体声麦克风.

UPDATE: When I added in Dec 2013 that "the invention of the TRRRS (I would suggest to call it "T3RS") plug would solve the problem" I couldn't know that Sony was already working on that and presented the "STM-10" stereo microphone with exactly that T3RS-plug in Feb 2014.

这是一个普遍的限制

是的，但仅仅是因为硬件音频插头，而不是因为许可.

Yes, but simply due to the hardware audio plug, not due to licensing.

2014 年很少有配备 T3RS 插头和外部立体声输入的 Android 智能手机:Xperia Z2、Z2 平板电脑、Z3

In 2014 there came very few Android smartphones that have the T3RS-plug with external stereo input: Xperia Z2, Z2 tablet, Z3

作为旁注，输入放大器的增益被调整为麦克风输出电平，而不是线路电平(例如 CD 播放器).

As a side note, the gain of the input amplifier is adjusted to microphone output level and not to line level (e.g. of a CD-player).

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