Previously, wireless earphones were based on Flash circuits, which cost more and took longer to develop. For CODECs closely related to audio quality, the previous Bluetooth headset chip also only supports SBC decoding. CSR recently launched the Bluetooth solution with built-in stereo DSP ROM BlueTunes ROM from these four aspects to solve the current predicament of stereo headset Bluetooth headset.
BlueTunes ROM provides a ready-to-use solution. It is the world's first ROM Bluetooth solution designed specifically for stereo headphones and integrated with a digital signal processor (DSP). It is designed to allow end users to seamlessly switch between wireless music playback and voice calls.
BlueTunes ROM is based on the lower cost ROM, and the developed code has been saved in the ROM. Users only need to select options through the interface, without much development work, which greatly reduces the Bluetooth stereo headset. Cost and development time.
BlueTunes ROM is based on the BlueCore5 multimedia platform. BlueCore5 multimedia integrates battery charger, DSP and RISC processor, stereo CODEC, Bluetooth radio frequency and ROM. The integrated stereo CODEC provides a signal-to-noise ratio of 95dB, and the total harmonic distortion is only 0.008%. BlueTunes ROM also supports SBC and MP3 decoding (licensing required), can get better audio quality for music playback, and has a configurable five-band equalizer (EQ) to improve the end user experience.
In terms of power saving, BlueTunes ROM provides highly optimized energy saving strategies. Using a 180 mAh battery can achieve up to 10 hours of music playback (MP3 48bit, using 2HD5 or 2DH3 data packets). If you use a 180 mAh battery and run CVC software, you can achieve 12 hours and 16 hours of talk time (respectively using HV3 and 2EV3 data packets).
In addition, the delay of the Bluetooth headset link (200ms) has also become an obstacle for Bluetooth headsets in video and gaming applications. The FastStream integrated in BlueTunes ROM can reduce the delay of the audio link to 28-34ms, thus avoiding the "lip-sync" problem, which is especially helpful for listening to audio through headphones or speakers while watching the video.
As a company that is 100% focused on short-range wireless technology, CSR has an inherent advantage in integrating other wireless technologies with Bluetooth as the center. For example, now that NFC mobile phones have become popular in some developing countries such as Japan, most of these NFC adopt passive mode. Once the phone has no battery, the NFC function cannot be used. CSR's NFC solution supports both passive and active modes, thanks to CSR's multi-antenna integration technology, which can solve the demanding requirements of low power consumption.
"From FM, GPS, Bluetooth low energy to Wi-Fi, UWB, NFC, CSR will integrate these short-range wireless technologies on a single Bluetooth chip to provide high-performance, low power, small size, and cost-effective solutions. To meet the needs of multi-directional wireless connectivity. For example, users only need to increase $ 1 to get both Bluetooth and GPS functions. "Xu Junfeng, vice president of CSR Asia Pacific, said at the CSR Shenzhen office when talking about product development strategies.
In order to integrate many short-range wireless technologies in mobile phones and other electronic devices in the most efficient and cost-effective manner, CSR proposed the concept of "connection center", that is, intelligently integrating these technologies on a single chip to avoid multiple technologies The negative effect of simple combination. Currently, a large number of CSR shipments are the fourth-generation product BlueCore4, which will focus on BlueCore6 next year, and the recently launched BlueCore7 targets future applications with the highest integration. The size of this single-chip CMOS IC BlueCore7 product is less than 4x4mm, but it includes Bluetooth v2.1 + EDR, Bluetooth low energy, enhanced GPS (eGPS), and FM transmitter and receiver with RDS function.
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