Multimedia audio system with audio digital interface

Abstract

The invention relates to a multimedia sound system with a musical audio digital interface. The multimedia sound system comprises at least a USB / IEEE1394 interface, a USB / IEEE1394 external sound card, a group of D-typed or T-typed audio power amplifier chips or a group of control circuits or microprocessor chips that are matched with the sound card and the power amplifier, a PCB plate and at least a pair of dual channel sound boxes. Each sound box is at least provided with a full range speaker with double coils and double magnetic gaps or with a plurality of coils and a plurality of magnetic gaps with resistance loading property and approximate resistance loading property, wherein, the aperture is less than 7 inches, and only one conical single vibrating diaphragm is configured in the full range speaker; therefore, various high-fidelity or monitoring multimedia sound systems is formed, wherein, the working voltage is equal to or less than 5.25V and the output power is equal to or more than 2*1W under 3-4 ohm of loading.

Description

technical field [0001] The invention relates to a multimedia audio system with an audio digital interface, in particular to a multimedia audio system with a USB external sound card or an IEEE1394 external sound card and directly powered by a computer or a CD game machine, belonging to the electrical audio field. Background technique [0002] A multimedia sound system with an audio digital interface, including a multimedia sound system with a USB external sound card or an IEEE1394 external sound card, is a prior art product. [0003] For example, Microsoft just released the DDS80 type USB audio system powered by an external power supply as early as the end of last century. [0004] The DGX320 audio system launched by PHILIPS in 2006 has a 1-inch tweeter, a 2-inch full-range speaker and a passive bass radiator in each speaker, and the power is provided by the USB interface of the PC. The output power is 2×1W, the frequency response range is 100Hz~20KHz. [0005] In March 200...

AI Technical Summary

Problems solved by technology

[0018] Third, small coaxial speakers and full-range speakers with "tweeter cup" diaphragms also need to add energy-consuming crossover networks and active power amplifiers to work normally, and their electroacoustic reproduction quality is difficult to meet people's expectations. expected level

[0019] Fourth, in fact, USB audio often has many recognized advantages: 1) Due to the use of an external USB sound card, it can completely get rid of interference sources such as strong electromagnetic waves in the computer case; 2) Decoding based on PCM / PWM audio digital technology Encoder and Class D amplifier or Class T amplifier based on 1BitΔ-∑ digital-to-analog conversion technology based on DPPTM patent technology, compared with the very complex filter, R / C DC blocking network and Class AB power amplifier of the analog audio system, it is more effective in resisting Interference performance, signal-to-noise ratio, amplifier efficiency, dynamic operating voltage range, etc. are much better than the latter; 3) So far, almost all computer PCI mainstream sound cards only have 16Bit digital-to-analog and analog-to-digital conversion accuracy, while The DCA of the USB soft sound card in many "USB garbage speakers" often has a conversion accuracy of 20Bit

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