• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.401-404
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• 2009

In this paper, a new method to reduce the size of ROM in the direct digital frequency synthesizer(DDFS) is proposed. The new parallel ROM compression method can reduce the ROM size by using the two ROM. The quantized value of sine is stored by the quantized-ROM and the differential ROM. To reduce the ROM size, we use the differential quantization technique with this two ROM. So the total size of the ROM in the proposed DDFS is significantly reduced compared to the original ROM. The ROM compression ratio of 67.5% is achieved by this method. Also, the power consumption is affected mostly by this ROM reduction.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.3B
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• pp.584-591
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• 2000

In distributed arithmetic-based architecture for an inner product between two length-N vectors, the size of the ROM increases exponentially with N. Moreover, the ROMs are generally the bottleneck of speed, especially when their size is large. In this paper, a ROM size reduction technique for DA( distributed arithmetic ) is proposed. The proposed method is based on modified OBC( offset binary coding) and control circuit reduction technique. by simulations, it is shown that the use of the proposed technique can result in reduction in the number of gates up to 50%.

• Journal of the Institute of Convergence Signal Processing
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• v.8 no.3
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• pp.192-198
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• 2007

In this paper, a new method to reduce the size of ROM in the direct digital frequency synthesizer(DDFS) is proposed. The new ROM compression method can reduce the ROM size by using the two ROM. The quantized value of sine is stored by the quantized-ROM(Q-ROM) and the differential ROM(D-ROM). To reduce the ROM size, we use the differential quantization technique with this two ROM. First, we quantize the quarter sine wave with the $2^L$ address and store the quantized value at the Q-ROM. Second, after the $2^L$ address are equally divided into $2^M$ sampling intervals, the sampling value is quantized. And the D-ROM store only the difference between this quantized value and the Q-ROM. So the total size of the ROM in the proposed DDFS is significantly reduced compared to the original ROM. The ROM compression ratio of 67.5% is achieved by this method. Also, the power consumption is affected mostly by this ROM reduction.

• Proceedings of the IEEK Conference
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• 1999.06a
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• pp.821-824
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• 1999

In distributed arithmetic-based architecture for an inner product between two length-N vectors, the size of the ROM increases exponentially with N. Moreover, the ROMs are generally the bottleneck of speed, especially when their sire is large. In this paper, a ROM size reduction technique for DA (Distributed Arithmetic) is proposed. The proposed method is based on modified OBC (Offset Binary Coding) and control circuit reduction technique. By simulations, it is shown that the use of the proposed technique can result in reduction in the number of gates up to 50%.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.6 no.2
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• pp.126-137
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• 2007

In this paper, a new method to reduce the size of ROM in the direct digital frequency synthesizer(DDFS) is proposed. And we design the phase-to-sine converter using the phase accumulator of parallel type for generating the high frequency. The new ROM compression method can reduce the ROM size by using the two ROM. The quantized value of sine is saved by the quantized-ROM(Q-ROM) and the differential ROM(D-ROM). So the total size of the ROM in the proposed DDFS is significantly reduced compared to the original ROM. The ROM compression ratio of 67.5% is achieved by this method. Also, the power consumption is decreased according to the ROM size reduction.

• Journal of the Institute of Convergence Signal Processing
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• v.12 no.4
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• pp.291-297
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• 2011

In this paper, the differential quantized method and the parallel method to reduce the size of ROM in the direct digital frequency synthesizer(DDFS) is proposed And we design the DDFS by FPGA The new ROM compression method can reduce the ROM size by using the two ROM. The quantized value of sine is saved by the quantized-ROM(Q-ROM) and the differential ROM(D-ROM). Also we design the phase-to-sine converter using the phase accumulator of parallel type for generating the high frequency. So the total size of the ROM in the proposed DDFS is significantly reduced compared to the original ROM The ROM compression ratio of 67.5% is achieved by this method. Also, the power consumption is decreased according to the ROM size reduction and we can design the DDFS generating the high frequency.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.10
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• pp.1179-1182
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• 2016

In this paper, a new method to reduce the size of ROM in the direct digital frequency synthesizer (DDFS) is proposed. This method use the sine-linear phase difference method and differential PCM. The new ROM compression method can reduce the ROM size by using the two ROM. The quantized value of sine-linear phase difference is saved by the ROM1 of the $2^N$ sample period. The ROM2 save the difference between the original sine-linear phase difference value and the saved sample value of the ROM1. The ROM compression ratio of 37% is achieved by this method. Also, the power consumption is decreased according to the ROM size reduction.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.11
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• pp.2017-2022
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• 2007

In a memory, most power is dissipated in line of high capacitance such as decoder lines, word lines, and bit * lines. The decoder size as well as the parastic capacitances of the bit-line are going to reduce, if ROM core size reduces. This paper proposes to reduce a mathod of power dissipation for reducing ROM core size. Design result of ROM used in FFT[2], proposed method lead to up to 40.6%, 42.12%, 37.82% reduction in area, power consumption and number of Tr. respectively compared with previous method.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.40 no.6
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• pp.78-86
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• 2003

When we transformed from Monochrome-data to Color-data in text mode, we used hardware-method to design the circuit which is convertible in real time. We saved color information in every screens that can make screen in Color Palette ROM and it is also generated 8bit. lower 4bit assign foreground color and upper 4bit can design to have background color. We have Address Reduction ROM to remove repeated address and reduce volume of Color Palette ROM to 1/16. Besides, we have many D-FF to save address, data and page information temporarily after that, we have management process 8 times through counter in real time. Finally, we chose either foreground color or background color in multiplex and established color information was sended to the color video controller. Thus, you can use it as a good interface when yow transfer many control devices with Monochrome display (ex, LCD Monitor) into devices with Color display.

• Journal of the Korean Academy of Clinical Electrophysiology
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• v.9 no.1
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• pp.23-28
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• 2011

Purpose : The purpose of study was to better understand the effects of Interferential Current (IFC) and Ultrasound on the ROM and pain in patients with chronic back muscle pain. Methods : Twenty patients with chronic back pain were randomly assigned to IFC stimulation groups and Ultrasound stimulation groups. Both groups used the same method for 20 minutes each session, three times a week for 4 weeks at the same time point and with the same amount of treatment. Measurement items are visual analogue scale (VAS) and range of motion (ROM). Results : This study showed that the IFC stimulation group and the ultrasound stimulation group demonstrated significant improvement in ROM increase and pain reduction. Both groups showed a significant reduction in VAS; however, the ultrasound stimulation group decreased more than ultrasound stimulation group. And, both groups showed a significant increase in ROM. The ultrasound stimulation group increased significantly more than the IFC stimulation group in ROM of flexion and extension. The IFC stimulation group increased significantly more than the ultrasound stimulation group in ROM of lateral flexion. Conclusion : Pain relief was more effective in the ultrasound group. The ultrasound showed a more significant effect than IFC in ROM of flexion and extension. The IFC showed a more significant effect than ultrasound in ROM lateral flexion. The results of this study suggest that the treatment effects are different on patients with chronic back pain, according to treatment methods.