A Key of Bluetooth Speaker or Bluetooth Amplifier --- Bluetooth module

A Key of Bluetooth Speaker or Bluetooth Amplifier --- Bluetooth module 

Bluetooth speakers or bluetooth amplifiers have become more and more popular now as wireless signal transmission. You could see them  every year at CES. At same time, bluetooth Technology had been improved from 1.0 version to 4.1 one now, it is can achieve CD level music for the bluetooth 4.0 version, and it is used hifi audio.You will not connect those signal input cable, only set up bluetooth connection between your bluetooth devices like as iPhone or android smartphone, tablet.Then, you can play stream music form your local disk or internel through WIFI, of course, you should install a music play, if it support to play lossless format such as WAV, APE, FLAC, APAC, it absolutely achieve CD quality. 

But do you know how it is used in PCB?  normally, it is soldered as a module where the bluetooth ic and other op ic will be soldered there, also the program will be burned on ROM inside previously.manufacturer purchase it from module supplier, which is customized by the supplier, for example display name on the host, prompt, volume..., and so on.We also provide those customizations. There is more stable and quality module that is made of CSR8645, which support apxt decoding.The moudles had been used in a lot of bluetooth speakers or amplifiers, like as FATMAN mini tube bluetooth amplifiers and other Bluetooth speakers by UK.Especially, the original manufacturer of bluetooth ic provide us strong support from PCB designing.

 It is better to start weaving your fishing nets than merely coveting fish at the water, right? If you want to  develop your high quality Bluetooth speaker or amplifier or modify your current audio system to ass wireless connection function, it will be a better choice.

This CSR8645 Rom Module Functions:

1. Bluetooth version 4.0 plus EDR standard specification.
2. Radio power: Class 2.
3. Support A2DP 1.2, AVRCP 1.4, HFP1.6(including WBS and Msbc), HSP1.2.,etc protocols.
4. Adopt CSR voice enhancing technology of latest sixth version CVC to realize noise reduction and echo cancellation.
5. Support multipoint connection (connection to 2 phone for voice and music)
6. Support CSR Secure Simple Pairing, Proximity Pairing and CSR Proximity connection.
7. Support user to define muliti-language voice prompt function.
8. Support voice dialing / rejection calling.
9. Support SBC, MP3, AAC, APT-X music format.

            10. Support output port: PIO / UART/SPI/AIO/SPK/MIC/USB.

            11. Built-in 16 bits stereo decoder, S/N of digital to analog convert is up to 95Db.

            12. Built-in DC DC conversion power management.

            13. Integrated Li-ion battery charging function, charging current is up to 400mA maximum.

            14. Smaller SMT package: 26.5mm*13mm*2.2mm.

            15. RoHS compliance.

 More details, please find http://www.aliexpress.com/store/product/CSR8645-ROM-Bluetooth-Module-Bluetooth-4-0-Mulitport-Output-Support-APT-X-Decoding-DIY-RoHS-Compliance/725205_1276174862.html

Or use this one with key board.

http://www.aliexpress.com/store/product/CSR8645-ROM-Bluetooth-Module-Bluetooth4-0-Mulitiport-Output-Support-APT-X-Decoding-With-Key-Board-DIY/725205_1644152718.html

Bluetooth High Speed Technology

Bluetooth High Speed Technology

Bluetooth high speed technology lets you quickly send video, music and other large files between your devices.


The Bluetooth SIG announced the release of Bluetooth high speed technology in April 2009 when it completed Bluetooth Core Specification Version 3.0 + HS. The v3.0 Specification enables the use of a Generic Alternate MAC/PHY, allowing well known Bluetooth protocols, profiles, security, and pairing to be used in consumer devices while achieving faster throughput by momentary use of a secondary radio already present in the device.(more Bluetooth product information, please visit http://www.wistao.com/en/index)


Bluetooth high speed technology is also included in the newer Bluetooth v4.0 Specification released in June 2010.


Bluetooth high speed technology works by isolating activity from the AMPs, enabling the use of new radios without full system integration. This reduces costs while expanding future build opportunities. It also removes the user from new paradigms and supports existing Bluetooth use cases, making them faster and ensuring continuity for the UX experience while lowering costs and reducing training requirements.


The v3.0 + HS enhancement to the Core Specification provides consumers with powerful, wireless connections that are more robust and reliable than ever before. Features include:

Power Optimization - By using the high speed radio only when you need it, Bluetooth high speed reduces power consumption, which means a longer battery life for your devices.


Improved Security - The Generic Alternate MAC/PHY in Bluetooth high speed enables the radio to discover other high speed devices only when they are needed to transfer your music, pictures or other data. Not only does this optimize power, but it also aids in the security of the radios.


Enhanced Power Control - Limited drop-outs are now a reality. The enhanced power control of Bluetooth high speed makes power control faster and ensures limited drop-outs, reducing consumer experience of impacts from power. Users are now less likely to lose a headset connection—even when the phone is in a coat pocket or deep inside a purse.


Lower Latency Rates - Unicast Connectionless Data improves the customer experience of speed by lowering latency rates, sending small amounts of data more quickly.

CSR APT-X Audio Professional Coding and Decoding Technology

CSR APT-X Audio Professional Coding and Decoding Technology

CSR aptX audio coding technology replaces the standard audio codec Bluetooth employs for streaming stereo audio wirelessly from audio devices to headphones and speakers, delivering improved, high-fidelity sound comparable to the CD quality consumers have come to expect from their home entertainment systems. 

Already installed in a fast-growing ecosystem of top-notch Bluetooth headphones, hot speaker docks, and Bluetooth adapters for in-car and home-based audio systems, aptX® audio coding technology super-charges the fidelity of stereo audio when streamed over a Bluetooth wireless connection. So next time you use aptX® enabled Bluetooth headphones to enjoy the plaintive voice of Stevie Nicks streaming from your new Android powered like as Samsung smart phone or IPhone5, listen up to the positive difference aptX makes.

Although standard Bluetooth technology offers the ability to stream stereo audio wirelessly from audio devices to headphones and speakers, this bandwidth-constrained solution does not come close to the audio quality consumers have come to expect from their electronic entertainment systems. CSR aptX audio coding technology solves this problem, breaking the bandwidth barrier to deliver CD-quality stereo audio wirelessly over Bluetooth connections for a variety of consumer electronics applications. As a result, aptX is becoming a preferred choice for premium quality Bluetooth audio, having been deployed in a fast growing list of products by companies including Samsung®, Nokia®, HTC®, Motorola®, Creative®, Sennheiser® and many more.

CSR's world renowned aptX® audio compression solutions retain the full integrity of original digital audio and are optimized for instant real-time audio streaming. The suite of algorithms has earned a reputation for some of the highest audio quality, extremely low latency and strong resilience to bit errors, and has been proven in wireless, broadcast and professional live performance applications. (More Bluetooth audio information, please visit Wistao Technology Website http://www.wistao.com/en/index.html).

Product	Description
aptX® Lossless	The aptX® Lossless audio codec is developed for HD-Audio in professional and consumer applications.
aptX® Enhanced	The aptX® audio codec offers broadcasters a unique feature set delivering audio quality indistinguishable from linear at much reduced bit rates.
aptX®	By incorporating aptX® audio coding technology into the next generation of Bluetooth® stereo products, developers can offer consumers audio quality indistinguishable from wired with an impressive dynamic range.
aptX Live®	With virtually no delay, a strong, robust connection, and providing excellent channel density, aptX Live® enables real-time digital wireless audio in bandwidth constrained environments.

We provide you Bluetooth Module baced on Bluetooth 4.0 and apt-x technology.If you want to upgrade your audio system or DIY, you may click below:  

CSR8645 ROM Bluetooth Module Bluetooth 4.0 Mulitport Output Support APT-X Decoding DIY RoHS Compliance High Quality,

The module had been soldered on PCB, you just need connect output to your amplifier, and connect power wire for DC 5V, then you can enjoy wireless Bluetooth music from iPhone, iPad or other mobile smart terminals 

CSR8645 Bluetooth Module 

Pins of CSR8645 Bluetooth Module

Basics of Bluetooth Wireless Technology

Basics of Bluetooth Wireless Technology

Bluetooth technology is a short-range communications technology that is simple, secure, and everywhere. You can find it in billions of devices ranging from mobile phones, laptops, tablets and computers to medical devices and home entertainment products. It is intended to replace the cables connecting devices, while maintaining high levels of security.

The key features of Bluetooth technology are robustness, low power, and low cost. The Bluetooth Specification defines a uniform structure for a wide range of devices to connect and communicate with each other.

When two Bluetooth enabled devices connect to each other, this is called pairing. The structure and the global acceptance of Bluetooth technology means any Bluetooth enabled device, almost everywhere in the world, can connect to other Bluetooth enabled devices located in proximity to one another.

Connections between Bluetooth enabled electronic devices allow these devices to communicate wirelessly through short-range, ad hoc networks known as piconets. Piconets are established dynamically and automatically as Bluetooth enabled devices enter and leave radio proximity meaning that you can easily connect whenever and wherever it's convenient for you.

Each device in a piconet can also simultaneously communicate with up to seven other devices within that single piconet and each device can also belong to several piconets simultaneously. This means the ways in which you can connect your Bluetooth devices is almost limitless.

A fundamental strength of Bluetooth wireless technology is the ability to simultaneously handle data and voice transmissions. which provides users with a variety of innovative solutions such as hands-free headsets for voice calls, printing and fax capabilities, and synchronization for PCs and mobile phones, just to name a few.

The range of Bluetooth technology is application specific.The Core Specification mandates a minimum range of 10 meters or 30 feet, but there is no set limit and manufacturers can tune their implementations to provide the range needed to support the use cases for their solutions.

Bluetooth Core Specification

Unlike other wireless standards, the Bluetooth Core Specification provides product developers both link layer and application layer definitions, which support data and voice applications.

Spectrum

Bluetooth technology operates in the unlicensed industrial, scientific and medical (ISM) band at 2.4 to 2.485 GHz, using a spread spectrum, frequency hopping, full-duplex signal at a nominal rate of 1600 hops/sec. The 2.4 GHz ISM band is available and unlicensed in most countries.

Interference

Bluetooth technology's adaptive frequency hopping (AFH) capability was designed to reduce interference between wireless technologies sharing the 2.4 GHz spectrum. AFH works within the spectrum to take advantage of the available frequency. This is done by the technology detecting other devices in the spectrum and avoiding the frequencies they are using. This adaptive hopping among 79 frequencies at 1 MHz intervals gives a high degree of interference immunity and also allows for more efficient transmission within the spectrum. For users of Bluetooth technology this hopping provides greater performance even when other technologies are being used along with Bluetooth technology.

Range

Range is application specific and although a minimum range is mandated by the Core Specification, there is not a limit and manufacturers can tune their implementation to support the use case they are enabling. 

Range may vary depending on class of radio used in an implementation:

• Class 3 radios – have a range of up to 1 meter or 3 feet
• Class 2 radios – most commonly found in mobile devices – have a range of 10 meters or 33 feet
• Class 1 radios – used primarily in industrial use cases – have a range of 100 meters or 300 feet

Power

The most commonly used radio is Class 2 and uses 2.5 mW of power. Bluetooth technology is designed to have very low power consumption. This is reinforced in the specification by allowing radios to be powered down when inactive.

The Generic Alternate MAC/PHY in Version 3.0 HS enables the discovery of remote AMPs for high speed devices and turns on the radio only when needed for data transfer giving a power optimization benefit as well as aiding in the security of the radios.

Bluetooth low energy technology, optimized for devices requiring maximum battery life instead of a high data transfer rate, consumes between 1/2 and 1/100 the power of classic Bluetooth technology.