Decoder USB Sound Card 5V USB PCM2704 Mini USB Sound Card DAC Decoder Board Analog DAC Decoder Mini PCM2704 USB sound card / DAC decoder board, size: 12. 49MM (with terminal) USB power supply, analog output directly plugged into the computer's USB port, eliminating the need for connection The main chip uses BB's HIFI grade PCM2704 USB decoder chip, its performance is better than the market's most commonly used low-end chip CM102S series, the power supply using USB power supply, the output can be directly connected headphones, but also do the pre-level. More advanced DAC decoders offer SPDIF digital signals for better sound quality. Due to the external sound card, it avoids serious electromagnetic interference in the chassis, and the signal-to-noise ratio and sound quality are improved. PCM2704 is a monolithic digital-to-analog converter chip. It has two digital-to-analog output channels and an integrated USB interface controller. The interface conforms to the USB 1.1 standard.
PCM2704 can receive 48KHz, 44KHz and 32KHz sampling rate of 16-bit stereo or mono audio data, the chip integrated software volume and mute function, you can synchronize the adjustment of the computer volume and mute. PCM2704 Parameters: Power supply voltage: 5 V (USB power), distortion: THD + N: 0.006% (RL 10 kΩ) Distortion: THD + N: 0.025% (RL = 32 Ω) SNR: 98 dB Dynamic range: 98 dB Headphone output power: 12 mW (RL = 32 Ω) USB support sampling rate: 16BIT / 32-48KHZ USB support system: WINXP / WIN7 / WIN8, Apple MAC OS 9 / OS X, Andrews 4.1 above system (need to support OTG models) Picture is for reference only, the terminal color to prevail in kind.
What is the USB sound card? USB sound card is an external sound card. Looks much like U disk. USB sound card at the top of a USB line, which is used to plug in the motherboard USB interface, and the other end of the sound card is used to connect the ordinary speaker The Unlike other external devices need a separate power supply, small USB device power is from the host, do not use an external power supply, USB sound card is no exception, it's USB cable has four shares are used, two of which are used to The host to obtain electricity, while the other two is the information data line. USB sound card is another rising independent sound card products, but it is with the onboard AC'97 sound card is inextricably linked. This is mainly due to AC'97 sound card will be the sound card digital circuit and analog circuit separated, and AC'97 sound card will be directly connected with the PCI bus audio controller integrated into the chipset, which makes AC'97 soft sound card digital The conversion circuit and the analog output circuit can operate independently of the PCI bus. That is to say using the AC'97 specification, making the sound card can be separated from the ISA bus and PCI bus shackles, which is USB such as the formation of external sound card necessary conditions.
Free download pocsag encoding with soundcard Files at Software Informer. I rewrote large parts of the POCSAG decoder after reading the patent text as well.
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In support of AC'97 soft sound card operating system support, when it is inserted into the USB interface, the system will automatically recognize it is an AC'97 CODEC, and then automatically set to a USB AC'97 controller, which is formed USB sound card a general principle. USB sound card is the biggest advantage is that as long as the machine provides a USB interface can enjoy the sound card anytime, anywhere, and the advantages of using the USB interface for the sound card is to reduce the sound of the digital-analog conversion process, from the motherboard circuit noise and voltage interference, Which in theory get a more pure sound signal, and the use of USB interface in the mobility is also more flexible and convenient, this is now the USB sound card in the market to get the majority of consumers recognized the main reason. USB interface is now based on the sound card products in the market more and more, prices, quality are uneven, while consumers will be different in applicability.