Category:BT Audio
IC solutions
| Header text | Some models | Bluetooth | A2DP, AVRCP, HFP, etc | Output Analog / I2S / SPDIF | TWS | APTx | Features |
|---|---|---|---|---|---|---|---|
| OVC3860 | OmniVision | V2.0+EDR | A2DP V1.2, AVRCP V1.4 | ? | |||
| CSR8635 | qualcomm CSR | V4.1 | A2DP v1.2, AVRCP v1.4, HFP v1.6, HSP v1.2, DI v1.3 | Analog | X | Stero | |
| CSR8645 | qualcomm CSR | A2DP，AVRCP，HFP，AAC | X | X | APTx | Stero, | |
| CSR8670 | qualcomm CSR | V5.0 | A2DP V1.31, AVRCP V1.6, HFP 1.7 HSP 1.2, etc | Analog / I2S / SPDIF | TWS | APTx, APTx-LL, APTx-HD | |
| CSR8675 | qualcomm CSR | V5.0 | A2DP v1.3.1, AVRCP v1.6, HFP v1.7, HSP v1.2, MAP v1.1, PBAP v1.1.1, DID v1.1 | Analog / I2S / SPDIF | TWS | APTx | |
| BlueCore5 | qualcomm CSR | V2.1+EDR | A2DP V1.2, AVRCPV1.4 | ||||
| CSRA64215 | qualcomm CSR | V4.2 | A2DP V1.3, AVRCP V1.6, HFP v1.6, HSP v1.2, DI v1.3 | I2S | TWS | APTx, APTx-LL | |
| CSRA63225 | qualcomm CSR | ||||||
| BK8000L | Beken | V2.1 + EDR, +SPP | A2DP v1.2, AVRCP v1.0 | Aux-in, key control | |||
| BK8002 | Beken | V2.1 + EDR, +SPP | Aux-in, TF/SD, sequential MP3, FM(not good), key control | ||||
| BK8008 | Beken | TWS | |||||
| BK3254 | Beken | V4.1 | |||||
| BK3260 | Beken | V4.2 | |||||
| BK3266 | Beken | V4.2 | Aux-in, TF/SD, USB Disk, sequential MP3, change name, key control | ||||
| 66xx | Buildwin (appotech Jianrong) | ||||||
| RDA5856 | RDA | ||||||
| - | JL | ||||||
| IS1861S | ISS | ||||||
| BM2020 | Sunrise |
Concept
| Header text | English | Header text |
|---|---|---|
| A2DP | Advanced Audio Distribution Profile | Example |
| AVRCP | Audio/Video Remote Control Profile | Example |
| HFP | hand-free profile | 免提通话功能 |
| TWS | Qualcomm TrueWireless™ Stereo (TWS), which allows two devices to be configured as a stereo pair | 无线对笔功能，即一个手机可以同时连接2台蓝牙音箱，区分左右声道 |
| AAC | codec | |
| I2S | 数字音频输出 | |
| APTx, APTX-LL, APTX-HD | codec, qualcomm only https://en.wikipedia.org/wiki/AptX | 提升音质，减小延时，需要设备端（电脑、手机、平板〕也支持 |
| EDR | Enhanced Data Rate |
Current noise
Power
- Use soldering instead wires on power, or as short as possible, wires has large resistance.
- Better use linear regulator, if use DC-DC must avoid ripples, add LC circuits filter. See left side.(L - 10UH, D - 4148, C - 10~100UF)
- For normal AC-DC adapter, inductor can skipped.
- voltage must be 5V, not over 5V, 5.1-5.4V is not good
- Must lead out two wires to connect to power ground and audio ground seperatedly.
Other issues
- avoid interference signal, avoid large-size metals, avoid router, high power unit, etc
- avoid fully closed metal case
- Check different ground connection point to see the best place
- do not touch it
- If still noise, try to power supply amplifier and bluetooth module board seperately
Weak bluetooth signal
- Powr supply interference, ripples
- Power supply incorrect voltage
- delete former matched modules, and re-pair