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External USB Audio Device In
https://q-syshelp.qsc.com/q-sys_9.3/content/Schematic_Library/alsa_receiver_sound_card.htm
In the Properties window, set External USB Audio to 'Enabled'. From your Inventory list, drag the External USB Audio Device In and External Audio Device Out components into your schematic. To send monaural audio from your device microphone, connect the External USB Audio Device In mono output pin to the input pin of a downstream component.
USB Audio Bridge – Speakerphone / Sound Card In
https://q-syshelp.qsc.com/Content/Schematic_Library/usb_receiver.htm
In the Windows Sound dialog > Recording tab, " CoreName Sound Card" displays as Line In. You can select up to 8 output channels (in pairs) for each USB Sound Card Out component, with a maximum of 16 input channels (Core 110f) or 8 input channels (I/O-8 Flex) in a design. Speakerphone Mode.
USB sound card - Electronic Circuits and Diagrams ...
https://www.circuitstoday.com/usb-sound-card
The decoded audio signals will be available at the VOUTL and VOUTR pins of the IC. The 12MHz crystal is connected between the XT0 and XT1 pins of the IC. The VBUS (USB bus power) pin and DGND (digital ground) pins of the IC are connected to the +5V and ground pins of the USB respectively.
USB Wiring Diagram: A Complete Tutorial | EdrawMax
https://www.edrawsoft.com/article/usb-wiring-diagram.html
USB pinout Diagram. This USB pin-out diagram shows the USB cable often connected to phones to charge them or transfer data. Type A connector is linked to the charger or PC, and a microSD connector is plugged into the phone. You can add labels to the wires, pinouts, and connectors to make your diagram more informative.
Generic Maker
http://www.genericmaker.com/2012/04/simple-usb-audio-device.html
The PCM2707 is a standard USB 1.1 audio IC. As such, it can play audio without any custom drivers. My device closely follows the reference design shown in TI's datasheet. The PCM2707 can play 16 bit stereo audio at a maximum sampling rate of 48kHz. It has a built in 175mW headphone amplifier for analog output.
Fundamentals of USB Audio - EDN
https://www.edn.com/fundamentals-of-usb-audio/
Figure 1: Transfers between a host and a USB device: Isochronous IN and OUT for audio-data, Control for setting parameters, and Interrupt for status monitoring. The data requirements of a USB Audio system depends on the number of channels, the number of bits to represent each sample, and the sample rate. Typical channel counts are 2 (stereo), 6 (5.1) or …
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