midSTER
Newbie
1 mesaje
|
bluetooth
scris pe 5 oct 2008 14:30 de midSTER
vreau sa-mi iau un bluetooth ca m-au prins gaborii cand vorbeam la telefon si am doua puncte. ce nu stiu io, merge orice casca la orice telefon sau daca e nokia trbuie nokia, daca e motorola motorola etc.
|
 sus |
|
BBrulez
Newbie
15 mesaje
|
Re: bluetooth
scris pe 5 oct 2008 17:16 de BBrulez
De principiu, bluetooth este o tehnologie standardizata si functioneaza independent de producator. Sunt totusi mai multe generatii si pot ocazional aparea probleme. Daca ai un telefon mai vechi poti sa te uiti ce generatie de Bluethooth are. In caz ca devii un pasionat, uite mai jos ceva de citit 
Specifications and features
The Bluetooth specification was developed in 1994 by Jaap Haartsen and Sven Mattisson, who were working for Ericsson Mobile Platforms in Lund, Sweden.[7] The specification is based on frequency-hopping spread spectrum technology.
The specifications were formalized by the Bluetooth Special Interest Group (SIG). The SIG was formally announced on May 20, 1998. Today it has a membership of over 11,000 companies worldwide. It was established by Ericsson, IBM, Intel, Toshiba, and Nokia, and later joined by many other companies.
[edit] Bluetooth 1.0 and 1.0B
Versions 1.0 and 1.0B had many problems, and manufacturers had difficulty making their products interoperable. Versions 1.0 and 1.0B also included mandatory Bluetooth hardware device address (BD_ADDR) transmission in the Connecting process (rendering anonymity impossible at the protocol level), which was a major setback for certain services planned for use in Bluetooth environments.
[edit] Bluetooth 1.1
* Ratified as IEEE Standard 802.15.1-2002.
* Many errors found in the 1.0B specifications were fixed.
* Added support for non-encrypted channels.
* Received Signal Strength Indicator (RSSI).
[edit] Bluetooth 1.2
This version is backward-compatible with 1.1 and the major enhancements include the following:
* Faster Connection and Discovery
* Adaptive frequency-hopping spread spectrum (AFH), which improves resistance to radio frequency interference by avoiding the use of crowded frequencies in the hopping sequence.
* Higher transmission speeds in practice, up to 721 kbit/s, than in 1.1.
* Extended Synchronous Connections (eSCO), which improve voice quality of audio links by allowing retransmissions of corrupted packets, and may optionally increase audio latency to provide better support for concurrent data transfer.
* Host Controller Interface (HCI) support for three-wire UART.
* Ratified as IEEE Standard 802.15.1-2005.
[edit] Bluetooth 2.0
This version of the Bluetooth specification was released on November 10, 2004. It is backward-compatible with the previous version 1.1. The main difference is the introduction of an Enhanced Data Rate (EDR) for faster data transfer. The nominal rate of EDR is about 3 megabits per second, although the practical data transfer rate is 2.1 megabits per second.[8] The additional throughput is obtained by using a different radio technology for transmission of the data. Standard, or Basic Rate, transmission uses Gaussian Frequency Shift Keying (GFSK) modulation of the radio signal; EDR uses a combination of GFSK and Phase Shift Keying (PSK) modulation.[9]
According to the 2.0 specification, EDR provides the following benefits:
* Three times faster transmission speed — up to 10 times (2.1 Mbit/s) in some cases.
* Reduced complexity of multiple simultaneous connections due to additional bandwidth.
* Lower power consumption through a reduced duty cycle.
The Bluetooth Special Interest Group (SIG) published the specification as "Bluetooth 2.0 + EDR" which implies that EDR is an optional feature. Aside from EDR, there are other minor improvements to the 2.0 specification, and products may claim compliance to "Bluetooth 2.0" without supporting the higher data rate. At least one commercial device, the HTC TyTN pocket PC phone, states "Bluetooth 2.0 without EDR" on its data sheet.[10]
[edit] Bluetooth 2.1
Bluetooth Core Specification Version 2.1 is fully backward-compatible with 1.1, and was adopted by the Bluetooth SIG on July 26, 2007.[9] This specification includes the following features:
* Extended inquiry response: provides more information during the inquiry procedure to allow better filtering of devices before connection. This information includes the name of the device, a list of services the device supports, plus other information like the time of day and pairing information.
* Sniff subrating: reduces the power consumption when devices are in the sniff low-power mode, especially on links with asymmetric data flows. Human interface devices (HID) are expected to benefit the most, with mouse and keyboard devices increasing their battery life by a factor of 3 to 10. It lets devices decide how long they will wait before sending keepalive messages to one another. Previous Bluetooth implementations featured keep alive message frequencies of up to several times per second. In contrast, the 2.1 specification allows pairs of devices to negotiate this value between them to as infrequently as once every 5 or 10 seconds.
* Encryption Pause Resume: enables an encryption key to be refreshed, enabling much stronger encryption for connections that stay up for longer than 23.3 hours (one Bluetooth day).
* Secure Simple Pairing: radically improves the pairing experience for Bluetooth devices, while increasing the use and strength of security. It is expected that this feature will significantly increase the use of Bluetooth.[11]
* Near Field Communication (NFC) cooperation: automatic creation of secure Bluetooth connections when NFC radio interface is also available. This functionality is part of the Secure Simple Pairing where NFC is one way of exchanging pairing information. For example, a headset should be paired with a Bluetooth 2.1 phone including NFC just by bringing the two devices close to each other (a few centimeters). Another example is automatic uploading of photos from a mobile phone or camera to a digital picture frame just by bringing the phone or camera close to the frame.[12][13]
|
| sus |
|
Guest
Guest
|
Re: bluetooth
scris pe 20 nov 2008 21:29 de Guest
interesant dar prea lung frate
pe scurt, eu vreau un hansfree bluetooth dar sa mearga sa ascult muzica, am inteles ca doar la handsfree cu fir poti sa asculti muzica ceea ce eu nu cred
|
| sus |
|
Guest
Guest
|
Re: bluetooth
scris pe 15 dec 2008 17:36 de Guest
vreau sa-mi iau un bluetooth ca m-au prins gaborii cand vorbeam la telefon si am doua puncte. ce nu stiu io, merge orice casca la orice telefon sau daca e nokia trbuie nokia, daca e motorola motorola etc. depinde de exemplu la digi.mobil se poate potrivi motorola
|
| sus |
|
motorolaL7
Veteran member
152 mesaje
|
Re: bluetooth
scris pe 14 mar 2009 19:06 de motorolaL7
interesant dar prea lung frate
pe scurt, eu vreau un hansfree bluetooth dar sa mearga sa ascult muzica, am inteles ca doar la handsfree cu fir poti sa asculti muzica ceea ce eu nu cred
sigur se poate asculta muzica la headset bluetooth doar ca, ar trebui sa vezi versiunea
bluetooth al telefonului de ex bluetooth v1.2 ti-ar trebui un headset v1.2
sau la BT v2.0 iti trebuie headset 2.0
p.s sunt independente de producator dar depinde de versiunea utilizata mentinata mai sus
Editat de motorolaL7 pe 14 mar 2009 19:07
|
| sus |
|
Guest
Guest
|
Re: bluetooth
scris pe 21 mar 2011 20:10 de Guest
castile bluetooth sunt compatibile cu orice telefon care are bluetooth,dar de preferat sa fie aceasi marca cu telefonul(pt o calitate optima a sumetului)
|
| sus |
|
|
Forum telefoane mobile
|
