Applications can be “1-dimensional” or 3-dimensional, depending on the type of zone to protect. Periodic sounds, even complex ones, are easier to cancel than random sounds due to the repetition in the wave form.
Protection of a “1-dimension zone” is easier and requires only one or two microphones and speakers to be effective. Several commercial applications have been successful: noise-cancelling headphones, active mufflers, and the control of noise in air conditioning ducts. The term “1-dimension” refers to a simple pistonic relationship between the noise and the active speaker (mechanical noise reduction) or between the active speaker and the listener (headphones). Continue reading Noise cancellation
Consumer Electronics Control (CEC) is an HDMI feature designed to allow the user to command and control up-to 15 CEC-enabled devices, that are connected through HDMI
If you experience problem with your Raspbmc not detected by a TV set and in result your multimedia setup is quite crippled – you cannot control your Pi using the remote control, but you are forced to use e.g. Yatse on your mobile.
These things you have to check:
1. Does your TV support HDMI-CEC?
2. Does your HDMI cable supports CES? Yes of course it supports it since version 1.0, but who knows some cheap crap does not have it? Of course as of today you want the latest HDMI v1.4b
3. Is HDMI-CEC is enable on your TV set?
From Raspbmc point of view it should work without any additional configuration needed.
In my case everything was ticked but for some reason still TV does not detect the Pi device. Of course I do have the display, but no remote control capabilities.
In my case it is Samsung.
From what I have discovered you have to do a proper power cycle of the this TV set to detect CEC capable device – Raspbmc.
You have to completely disconnect it from power for a decent 20 seconds. Pi can stay on and connected via HDMI to the TV.
Once you turn it back on it should detect it. If not please try couple more times or consider other options.
I think from what I see on the Internet it is quite common issue with Samsung and probably you have to repeat this action periodically.
The worst in configuration. The web based interface looks awful and every time you edit something no one else can use the photocopier. Every time you change something to test it you have to log off!
You would think that USB pen drives pose a threat to computer security, but look at HID device as a tool of the insider_C_Siedlarz presentation where a USB keyboard can do it too.