Bluetooth® Classic for wireless voice and audio

Primarily used for wireless headphones and portable speakers, audio quality is a main performance criterion for Bluetooth® Classic and needs thorough testing

Bluetooth® Classic for wireless voice and audio

Bluetooth® Classic is implemented in most mobile phones and laptops to enable wireless headset connectivity or connectivity between mobile phones and other devices for synchronization. Most new cars already offer Bluetooth® enabled in-car entertainment (ICE) systems and handsfree calling systems.

The unique feature set of Bluetooth® Classic

Bluetooth® is a frequency hopping spread spectrum system that works in the internationally available ISM bands at 2.4 GHz. The initial goal of Bluetooth® Classic is a data connection up to 700 kbit/s in an ad hoc network. The data connection is based on a protocol stack profile such as audio, file transfer or streaming that allows a complete single-device design. Bluetooth® specification 2.0 implemented an enhanced data rate (EDR) of up to 3 Mbit/s.

Basic rate Extended data rate
Spectrum 2.4 GHz ISM band 2.4 GHz ISM band
Number of channels 79 79
Channel spacing 1 MHz 1 MHz
Interference avoidance Adaptive frequency hopping spread spectrum (1600 hops/s over max. 79 channels) Adaptive frequency hopping spread spectrum (1600 hops/s over max. 79 channels)
Error detection/correction FEC FEC
Advertizing Advertizing sequence Advertizing sequence
Audio support YES (advanced audio distribution profile, handsfree profile, handsfree audio gateway profile) YES (advanced audio distribution profile, handsfree profile, handsfree audio gateway profile)
Header modulation GFSK (160 kHz deviation) GFSK (160 kHz deviation)
Data modulation GFSK (160 kHz deviation) π/4-DQPSK or 8DPSK
Max. data rate 1 Mbit/s 3 Mbit/s
Test setup for Bluetooth® Classic audio testing in signaling mode with the R&S®CMW wireless communication tester

Your Bluetooth® Classic test challenges

Developers of Bluetooth® enabled devices use ready-to-go chipsets or modules for easy integration of Bluetooth® connectivity into their device. However, each device design is slightly different. There are several factors in the final design that may influence the overall communications performance, such as antenna design, power supplies, other wireless communications chips or the final housing.

Therefore, it is necessary to test each Bluetooth® enabled device to verify the required performance and to ensure conformance with Bluetooth® SIG standards and regulatory requirements, especially since Bluetooth® operates in the unlicensed spectrum and has to interwork with other radio technologies using the same spectrum. Testing of Bluetooth® RF performance and quality can be quite easy.

Benefits of Rohde & Schwarz Bluetooth® test solutions

  • Test and measurement solutions from Rohde & Schwarz support Bluetooth® basic rate, EDR and LE in line with Bluetooth® core specifications v1.2, 2.0, 2.1, 3.0+HS, 4.0, 4.1, 4.2, 5 and 5.1. for design, certification and production
  • The R&S®CMW wireless communications test platform supports Bluetooth® up to version 5.1. It covers the Bluetooth® Classic signaling function and all Bluetooth® LE transmitter and receiver tests as specified by Bluetooth® SIG. In addition, dirty transmitter tests and application testing are supported
  • Bluetooth® test functions are also available for all major Rohde & Schwarz test instruments, including signal generators and signal analyzers. The test instruments support Bluetooth® as well as other non-cellular standards and all major cellular standards in one box

Related products

R&S®CMW270 wireless connectivity tester

The non-cellular expert covering Bluetooth® Classic and Bluetooth® LE testing up to version 5.1 in non-signaling and signaling mode. Qualified by Bluetooth® SIG for RF testing.

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R&S®SMBV100B vector signal generator

The new benchmark in its class with up to 500 MHz modulation bandwidth and excellent EVM performance even at high output power levels supporting Bluetooth® EDR and Bluetooth® LE 5.0 signal generation.

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R&S®FPL1000 spectrum analyzer

Experience high performance wherever you take it. It supports not only spectrum analysis, but also highly accurate power measurement and analysis of analog and digitally modulated signals.

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R&S®TS8997 regulatory test system for wireless devices

Supports regulatory testing for wireless devices operating in ISM bands based on ETSI and FCC.

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R&S®CMW100 communications manufacturing test set

The ultra-compact non-signaling tester optimized for production lines for calibration and verification.

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R&S®UPV audio analyzer

Compact instrument for all audio measurements designed for precise audio quality analysis.

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R&S®CMW-Z10 shielded box

Excellent shielding effectiveness and superior coupling characteristics for frequencies up to 6 GHz, is perfect for OTA testing of Bluetooth® devices.

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R&S®CMWrun sequencer software tool

Production-ready sequencer tool for parallel multi-DUT testing with integrated chipset control.

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Related resources

White paper: From cable replacement to the IoT – Bluetooth 5.1

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Application note: Bluetooth® adaptive frequency hopping on an R&S®CMW

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Application brochure: Bluetooth® testing with the R&S®CMW wideband radio communication tester

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Application note: Advanced Bluetooth® RF tests with R&S®CMWrun

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Application card: Conducted multi-standard in-device coexistence testing

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Related solutions

Bluetooth testing

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Non-cellular device manufacturing

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Audio testing of Bluetooth® components

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IoT testing

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