British chord Chord MOJO spell Portable Decoding Headphone Amplifier DAC
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Core hardware and main functions
Core hardware: The appearance of MOJO is very small. It is not difficult to see from the comparison with iPhone6 ??Plus and HUGO in the picture that its size is smaller than the cigarette case. Before paying attention to its use function, first of all, let''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s take a look at the changes in its core hardware part.
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Chord chord MOJO portable external decoder [sound card]-Xillinx Atrix-7 XC7A15T FPGA chip
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Chord chord MOJO portable external decoder [sound card]-4E Pulse Array DAC external components-diodes and resistors
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Chord chord MOJO portable external decoder [sound card]-crystal oscillator
From our disassembly and official introduction, everyone should be clear that the main reason why MOJO can become so small is the update of the FPGA chip. In HUGO, the FPGA chip used is Xilinx''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s SPARTAN-6 LX series, which is produced by Samsung''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s 45nm process. In MOJO, the XC7A15T FPGA chip of the ARTIX-7 series updated by Xilinx is used. This chip comes from TSMC’s 28nm HPL process produced by TSMC. Its performance and resources have been improved, and its power consumption has been drastically reduced.
According to the official information given by Xilinx, the number of programmable units of the XC7A15T of the ARTIX-7 series has reached 16,640 [SPARTAN-6 LX9 is 9152], DSP Slice, XC7A15T is 45 [SPARTAN-6 LX9 is 16 A], 1.2Gb/s LVDS [Chord''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s digital signal channel is implemented with LVDS and FPGA], the static typical power consumption is reduced by 65%, and the dynamic power consumption is reduced by at least 50% on average. At the same time, XC7A15T has many more obvious advantages, but we don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t know what other improvements will help FPGA DAC.
Since Chord officially did not provide whether MOJO has improved the accuracy of WTA filters because of the use of ARTIX-7 series FPGA chips, or whether it has reduced the level because of the need to control power. But what is certain is that this FPGA chip is obviously better and smaller in size, and the greatly reduced power consumption is an important reason why MOJO can greatly reduce the volume.
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Chord chord HUGO external decoder-FPGA and peripheral work flow chart
Although there is no detailed official data on the accuracy of the internal working principle of MOJO FPGA, it is certain that there is no difference between the core working system of MOJO and HUGO, which is still Chord''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s 4E Pulse Array FPGA DAC architecture. But in terms of function, the sound field DSP arithmetic unit of the HUGO headphone output part must be removed. The digital volume, the phase-locked loop function of the digital signal, the WTA filter and the final output mode are unchanged.
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It can be seen from the disassembly that some chip resistors and diode components are still distributed next to the MOJO FPGA chip to finally realize the output of the voltage signal. The output of the analog part still seems to be a solution that uses a triode chip directly, but it seems that the model is different from that on HUGO. In terms of USB function and control function, it is still the same ATMEL SAM3U1C ARM core USB control chip as on HUGO.
Main function: MOJO has a small appearance, adopts an all-metal shell, and has a very fine frosted surface oxidation treatment on the surface. You can see from the picture that there are three translucent glass balls, one of which is the power switch button, and the other two are the volume adjustment buttons. They are designed to be able to rotate at will on the machine, but the rotation is only for the comfort of the hand? Fun? There is no actual function. The actual function still needs to be pressed down to start. Translucent design, in line with Chord has always liked to play“light&The style of rdquo; also, in the working state, the ball of the power button has different sampling rate specifications for playing sound, and there are different colors corresponding to it. The different colors of the volume keys represent the volume. The correspondence is basically the same as that of HUGO [The display of MOJO in the loudest segment seems to lack color, which is slightly different].
MOJO provides two sets of 3.5mm interface output, the two interfaces are connected in parallel. Generally speaking, connecting two earphones at the same time is not a problem because of its huge output power. Since its output part is similar to HUGO, Lineout can also directly use these two 3.5mm interfaces. In actual measurement, its maximum output voltage can reach about 8Vrms.
There are multiple interfaces on the other side of MOJO. Two Micro USB ports, one of which is dedicated to charging, and the other is to connect to a computer or iOS or Android devices. In addition, MOJO also provides a coaxial input with a 3.5mm interface and a standard optical input interface. For the random device, MOJO only provides a short MicroUSB cable, and the coaxial adapter cable needs to be customized by yourself.
MOJO is powered by a battery. It can be used for 10 hours after 4 hours of charging. The battery life is basically satisfactory. The actual test seems to be slightly shorter than 10 hours. For HUGO officials, it has been mentioned that it will always use battery power, that is, the machine connected to an external power supply also draws power from the battery, and the external power supply is used for charging. And MOJO seems to be the same principle. The interface responsible for USB data transmission will not have a battery charging relationship with the computer or mobile phone.
Compared with HUGO, MOJO only provides a USB interface to connect to a computer or mobile phone. This interface supports Core Audio for iOS and Mac. In theory, the Android operating system can also support [3rd party app required]. The Windows system needs to install a driver to support it. That is, this USB interface is the so-called high-definition audio interface on HUGO. And MOJO is indeed a step further than HUGO in terms of USB interface indicators. It can support DSD256 decoding and 32bit/768kHz PCM decoding under the DoP 1.0 specification.
(The above evaluation is reproduced from Digital Multi)