Multimedia audio system with audio digital interface

Abstract

The invention discloses a multimedia sound system provided with an audio digital interface and the system comprises at least one USB/IEEE1394 interface, one USB/ IEEE1394 external sound card, a group of D or T type audio power amplifier chips or a group of control circuits or microprocessor chips matched with the sound card and the amplifier, a PCB board and a pair of two-channel sound boxes. Each sound box is at least provided with a double-coil double-magnetic gap or multi-coil multi-magnetic gap all band loudhailer the caliber of which is less than 7 inches and which is only provided with one vibrating diaphragm and has a resistance load characteristic or a characteristic similar to the resistance load characteristic, thus forming a plurality of high fidelity or monitoring grade multimedia sound systems the working voltages of which are equal to or less than 5.25V and the input powers of which are more than or equal to 1W under the load of 3 to 4Omega.

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 Compared with the very complex filter, R / C DC blocking network and class AB power amplifier of the analog audio system, the encoder and class D amplifier or the class T amplifier based on the 1BitΔ-∑ digital-to-analog conversion technology of DPPTM patent technology is more effective in anti-corrosion 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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