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Acoustic Control On Computer System Disclosure Number: IPCOM000220107D
Publication Date: 2012-Jul-23
Document File: 7 page(s) / 173K

Publishing Venue

The Prior Art Database


The noise of blower from server may be harmful to administrator in the server room. Methods provided for controlling noise is needed. Based on the control of CPU temperature and blower fan speed, sound management and control can be organized by detecting and controlling CPU temperature and fan speed. And the most important, noise should be detected from the noizy environment.

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Page 01 of 7

Acoustic Control On Computer System

This idea intends to resolve the problem of acoustic control in the System X server. In modern DC, thousands of servers would be employed in one room. With the amount of servers growing dramatically, the environment of the server room become much more critical than ever before. More than one physical factor would be monitored by lotsof sensors in the server system, and lots of mechanism was designed to control the air flow, temperature, and etc. But for the noise made by the server, little of method was used to control it. In current IMM ( Integrated Management Module ) , there's an acoustic mode option. Once the blade is set to this mode, it would throttle the CPU rather than increase the fan speed when the temperature is higher than the threshold. The client can not get the information what's the noise level, and can not do more operation on that either.

A micphone is added to the rear of the server or chassis near to the fan, which is always the main noise maker. The output analog signal is connected to a ADC channel. IMM would harvest the data, and an algorithm would be used to calculate the noise level as sample data. IMM can compare the sample data and threshold set by the client, and do the decision whether to throttle the cpu or increase the fan speed, also the current noise level can be display in the IMM page.

To make sure the innovativeness of this new method , The set of keywords 'noise','control','computer','system' is searched in the Google Patent .

The most similar US patent is :
Pub. NO: US 2008/0112571 A1
This patent describes a method in which control sound level of a computer system within a selected zone. The sound level within an enclosed space is detected and an electronic signal representative of the sound level is generated in response . The airflow rate and processor load are both decreased in response to the detected presence when the sound level exceeds a predefined sound -level setpoint.

In contrast with this patent , our method is about the way of control the sound in a preset value and detect the local fan noise from environment noise generated by side .

System Overview


Page 02 of 7

Fig - 1

As showed in the Fig-1, a microphone would be placed near the fan and used to monitor the real time data, a ADC channel would be used to convert the analog singal to digital data, the IMM read the data periodically. The loudness data represents the noise generated by both the fan monitored and the fan in the server beside. So IMM will calculate the energy in a range of frequency through Fast Fourier Transfer (FFT), in which noise made by fan mainly distribute to decide. IMM get the value of fan speed and loudness from microphone. Fig-2 shows the wave chart of the

0.5 second record from server fan noise. Fig-3 shows the FFT of the data in the range of 2048. The average of the whole data, and the next is the 2048 points of FFT...