A video codec standard originally designed as a low-bitrate compressed format for videoconferencing. It has been widely adopted as the standard for video streaming over mobile networks.
Standard image sizes specified by H.263 include SQCIF (128 x 96 pixels), QCIF (176 x 144), and CIF (352 x 288) resolutions.
H.263 handles only the visual part of a video stream, the audio is encoded using audio encoders such as AMR.
- Half-QWERTY keyboard layout
A keyboard layout similar to QWERTY but having two letters per key. The basic arrangement is the same, however the keyboard is narrower which makes it suitable for use with one hand and it fits more easily in the lower part of a bar-shaped device.
- Handwriting recognition
The ability of a device or software program to analyze the shape of cursive or printed handwriting drawn on a touchscreen and then translate it into letters, words, numbers, and punctuation marks.
Most devices that have touchscreens have built-in handwriting recognition capability. Input is best done using a stylus.
It should be noted that only devices using resistive type of touchscreen readily allows for input with various objects. The capacitive touchscreen devices can accept only human finger input.
The kind of technology that provides physical feedback when the user interacts with virtual things. This could be “pressing” a button on a touch screen or “feeling” the rough edge of the road in a racing game.
The feedback is implemented as vibration.
- Hot Spot
An area where users can access Wi-Fi services to access the Internet if they have the appropriate device. Hot spots vary in area of coverage. They are usually public and many charge users by the day or month. However, some are free – for example privately owned in restaurants or cafes or public in universities and schools.
- Hot Swap
Inserting or removing an external peripheral device (such as flash memory or hard drive) from a host (a mobile phone or desktop computer) while the host is still operating.
- HSCSD (High-Speed Circuit Switched Data)
HSCSD is the “high-speed” variant of CSD (maximum speed of 9.6 kbps) that has better error-correction codes that give a boost in speed of about 50% and allows several call channels to be used as one – up to four channels – resulting in a maximum speed of 57.6 kbps.
HSCSD was never widely adopted outside Europe.
- HSDPA (High-Speed Downlink Packet Access)
An upgrade for UMTS networks that doubles network capacity and increases download data speeds by five times or more.
The service was initially deployed at 1.8 Mbps but upgrades to the networks and new user devices led to increased rates of 3.6 Mbps, followed by 7.2 Mbps and further down the road, 14.4Mbps and even 21Mbps.
HSDPA only handles the downlink while the uplink is handled by a related technology called HSUPA. The combination of both technologies is usually called HSPA.
- HSDPA+ (High-Speed Downlink Packet Access Plus)
Evolved High-Speed Packet Access, or HSPA+, is a technical standard for wireless, broadband telecommunication. HSPA+ enhances the widely used WCDMA (UMTS) based 3G networks with higher speeds for the end user that are comparable to the newer LTE networks.
- HSP (Headset Profile)
A Bluetooth profile that enables wireless connection between a phone and a Bluetooth headset. It supports simultaneous two-way audio but not stereo.
It is one of the most common profiles with only a small number of phones supporting only the similar Handsfree profile.
HSP is used by other devices as well, a Bluetooth-enabled PC with VoIP software such as Skype for example.
- HSUPA (High-Speed Uplink Packet Access)
An upgrade for UMTS/HSDPA networks that increases upload data speeds up to 5.76 Mbps. HSUPA together with HSDPA are sometimes referred to as HSPA.
The standard is backwards compatible with UMTS and HSDPA and will work with devices supporting only those standards.
HSUPA only handles the uplink while the downlink is handled by a related technology called HSDPA.
- HTML (Hypertext Markup Language)
A standard markup language used to create web pages.
It was designed with desktop computers in mind and web pages may have reduced usability when viewed on devices with smaller screens and limited input options (as is the case with most mobile phones).
There is a newer format called XHTML that is better suited for mobile devices.
- Hz (Hertz)
A unit of frequency measurement equal to one cycle per second.
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