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The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [5] [6] [7] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...
In May 2017, it was reported that WhatsApp users spend over 340 million minutes on video calls each day on the app. This is the equivalent of roughly 646 years of video calls per day. [366] By February 2017, WhatsApp had over 1.2 billion users globally, [367] reaching 1.5 billion monthly active users by the end of 2017. [368]
WhatsApp announces Channels, a feature that allows one-to-many communication for updates, and no defined limit for number of followers. Channels are not end-to-end encrypted, unlike messages in groups or chats. [45] [46] 2023 August Product WhatsApp relaunches its app for Apple computers, adding audio and video group calling. [47] 2023 September
PDF417 is a stacked linear barcode format used in a variety of applications such as transport, identification cards, and inventory management. "PDF" stands for Portable Data File. The "417" signifies that each pattern in the code consists of 4 bars and spaces in a pattern that is 17 units (modules) long.
Telephone numbers in Qatar. National Significant Numbers (NSN): eight digits. A new numbering plan took effect in 2010. The minimum number length (excluding the country code) is 3 digits. The maximum number length (excluding the country code) is 8 digits.
Opus is widely used as the voice codec in WhatsApp, [12] [14] [13] which has over 1.5 billion users worldwide. [127] WhatsApp uses Opus at 8–16 kHz sampling rates, [12] [13] with the Real-time Transport Protocol (RTP). [14] The PlayStation 4 video game console also uses the CELT/Opus codec for its PlayStation Network system party chat. [15]
A common size for cells inside cordless tool battery packs. This size is also used in radio-controlled scale vehicle battery packs and some Soviet multimeters. 1 ⁄ 2-, 4 ⁄ 5 - and 5 ⁄ 4-sub-C sizes (differing in length) are also available. Soviet 332 type can be replaced with R10 (#4, 927, BF, U8) or 1.5 V elements from 3 V 2xLR10 packs.
Payload is a variable-length field. Its minimum size is governed by a requirement for a minimum frame transmission of 64 octets (bytes). [e] With header and FCS taken into account, the minimum payload is 42 octets when an 802.1Q tag is present [f] and 46 octets when absent. When the actual payload is less than the minimum, padding octets are ...