IOS recording and playing: A few amazing demands
In a recent project, you need to connect the iPhone with a microphone (Apple is called Headset, and without a microphone is called Headphone), and then synchronize the recording and play. After this function is implemented, you need to change the Input Source for recording and playing.
For Synchronous Recording and playback, you must use the underlying interface. AVAudioRecorder/AVAudioPlayer cannot be
Pin descriptionPin name type description1 dbvdd supply digital I/O buffer supply2 mclka Digital Input master clock a input3 mclkb/gpio6/(ADA/mask) digital in/out master clock B input/gpio6/(Ada output/mask input)4 dgnd1 supply digital ground (return path for both dcvdd and dbvdd)5 sdataout Digital Input Serial data output from Controller/input to wm9713l6 bitclk digital output serial interface clock output to Controller7 dgnd2 supply digital ground (return path for both dcvdd and dbvdd)8 sdatain
, which is why? This phenomenon is mainly caused by several reasons:1, HDMI video card does not have a built-in sound card, this is seen in the Nvidia chipset graphics card, with this video card, you need to spdif the motherboard sound card output and graphics card SPDIF input (General video card will provide this wire, there will be wiring diagram), otherwise, HDMI video card does not have audio input, The
1280x720 @60hz,1920x1080 @30hz staggered, 1920X1080 @60hz.
Second, why not the voice?
Many friends use the HDMI line to do the computer connected to the TV, there is no sound on the TV, but the HDMI line itself is to support sound audio transmission, this is why? This phenomenon is mainly caused by several reasons:
1, HDMI video card does not have built-in sound card, this is seen in Nvidia chipset graphics card, with this graphics card, you need to put the motherboard sound card
best. in general your own ears are the best answer to this question. there are several excellent Listening Tests here that will help you to choose your audio format.
8. When converting, is it better to downsample my DVD audio to 44.1 kHz or keep it at 48 khz?
Unless you have to meet a standard's specifications, such as 44.1 kHz for SVCD, there is usually no reason to downsample audio to 44.1 kHz. it is possible that downsampling will introduce rounding errors when finding new sample points,
Note: Airpods only supports the latest iOS 10, watchOS 3, MacOS, or Sierra system versions of the device.
According to a US Science and Technology blog website, Airpods does not use any magic wireless technology, but is the Bluetooth technology used in most wireless headphones, but the Apple has been enhanced, such as the built-in W1 chip, and then through specific software to achieve automatic connection with the phone.
Overall, the airpods operation is very simple, double-click can start Sir
is not the implementation requirement:
Glory: 4. 2.2Kernel 3.4.5
Audiomanager.setmode (Audiomanager.mode_in_call);
Nexus 5 5.0.1Kernel 2.4.0
Audiomanager.setmode (Audiomanager.mode_in_call); cannot take effect even though adding the line still broadcasts from the speaker
2: Application ScenarioAudio output channels are many, Speaker, headset
I am not a headset enthusiast, can only be considered to listen to music a bit of a person. Since the first purchase of Sen Hai MX500, no longer willing to use any inferior with the headset. For the low-end Baishi block of headphones, the cost of investment is not high, but can bring a larger increase in listening to the song experience. That's why I've been insisting on buying headphones. I currently have
First, verify the headset equipment is normal
: If there is a problem with the headset, then there will be no sound when the headset is plugged into the notebook.
Verification Method:method One:Look for sound when you plug the headset device into another computer or mobile device. If the
One of the most prominent advantages of the Siemens SX1 mobile phone is that it supports stereo MP3 and built-in FM. Although the original stereo PTT headset is of good quality, it can also be used as an antenna with built-in FM, however, one of the traditional methods of using a Siemens mobile phone is to use a headset adapter to enable the use of standard 5mm stereo headphones, such as senhaiser mx300/400
There are many audio output channels, such as Speaker, headset, and Bluetooth a2dp. The audio output channel may be switched during calls or playing music. For example, when a wired headset is inserted to play music, the sound is sent from the headset. When the headset is pulled out, the audio output channel switches.
from the experience of porting Z5S 4.4 kernel and the official 4.4 audio configuration file, we should not add any Nubia features (of course, the headset detection must have been added ), however, the Nubia mentioned here is nothing more than the Z5Sn es325 audio conditioning chip, which has no effect on z5s. in the previous official audio configuration file snd_soc_msm_Taiko 4.2, you can find es325 configurations. the z5s 4.4 kernel I transplanted e
stillIn non-mobile devices (such as PCs), the audio frequency is usually produced by a crystal oscillator, but in the design of smart phones, to avoid additional power consumption, board space, and frequency chip costs, the designer prefers to separate the frequency functions required by the HIFI audio from the existing frequency. Because the low power consumption and low noise lock loop (PLL) can be integrated into the hybrid signal chip at a relatively low cost, so today's chip manufacturers
Integrated smart phones must have PCM interfaces and independent I2S or ac'' 97 interfaces at the same time. In non-mobile devices (such as PCs), the audio frequency is usually produced by a crystal oscillator, but in the design of smart phones, to avoid additional power consumption, board space, and frequency chip costs, the designer prefers to separate the frequency functions required by the HIFI audio from the existing frequency. Because the low power consumption and low noise lock loop (PLL
Small series Recommended answers:
Have you ever fallen or plugged in a headset? I've tried it, and it should have been a problem with the receiver. The headset should be inserted after the headset unplugged, but the inside of the shrapnel does not eject, causing the phone mistakenly think that the headset access witho
ranges from 20Hz ~ 20 kHz, so the sampling frequency must be at least 20 k × 2 = 40 kHz to ensure that low frequency distortion is not produced. This is also the use of 44.1 kHz for CD sound quality (slightly higher than 40 kHz is to leave room).
Signal-to-Noise Ratio: the ratio of the maximum fidelity output to the inevitable electronic noise calculated by DB. The larger the value, the better. Below 75 dB, noise may be detected in silence. The signal-to-noise ratio of the awe64 gold sound
the best choice is to use the headset, that is, headset headphones, microphone combination. The headset is designed for voice communication, so the headset and microphone design is particularly suitable for voice communication, and the use of headset, both allows you to emp
Users of the Mac believe that many have encountered the internal failure of the speaker, do not know that there is no careful user will find a Mac with the horn failure and the headphone hole will light up the red light, as shown in the following picture, that Mac headset Kong Liang red light is what reason? The following small series for everyone to bring Mac headset Kong Liang red light, At the same time
When using a computer, people often use headphones to watch movies or play games, but there are often netizens asked how to do headphones, there are many netizens are not sound how to set the computer headset problems, computer problems caused by many aspects of the problem, today, the Shield security engineers to teach you how to solve the problem of headphones do not sound. Why the headphones don't sound?
Headphones have nothing to do, of course, f
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