Bluetooth Speaker Box

Cirrus Logic offers a comprehensive sound enhancement solution for portable speakerphones ranging from mono/voice only applications to premium stereo entertainment systems. Achieving clear, loud, echo-free, full-duplex operation on a portable speakerphone represents the ultimate challenge in mobile and hands-free devices. Any solution must be able to tolerate extreme Echo-to-Near Ratios (ENR’s) in combination with a wide range of noise and acoustical environments from large open rooms down to cubicle spaces. Entertainment products also require the ability to deliver spacious stereo sound that engulfs the listener from a compact device regardless of location. Cirrus Logic’s SoundClear® technology for portable, wireless applications has the power, range and intelligent adaption to enable clear and natural voice communication under all these conditions. With SoundClear technology a portable speakerphone can provide high quality hands-free communication anywhere while transforming a connected smartphone into a robust entertainment device for music, video and games.

Bluetooth Speaker Box


SoundClear embedded software for Bluetooth speaker boxes is optimized to run on the CSR 8670 and BC5-MM. The solution includes:

  • Both spectral and spatial noise reduction
  • InstantAdapt™ for changing noise environments
  • Dual microphone and single microphone solutions
  • High Definition (HD) wideband processing
  • True full-duplex, echo free speakerphone operation
  • FlexEQ™ dynamic equalization for optimum intelligibility
  • Automatic volume and level control
  • Spectrally-matched comfort noise
Voice Processor
  • HD Voice/wideband and narrow-band support
  • Voice Activity Detector (VAD) for low power “Always on” command recognition applications
  • ASR Enhance™ pre-processor for increased ASR accuracy in noise
  • Transmit (Tx) and receive (Rx) noise elimination
  • AEC plus non-linear residual echo suppressor for superior full-duplex echo-free speakerphone operation
  • Ambient aware parametric EQ and automatic level control for both Tx and Rx voice streams
  • Automatic volume control for Rx output
  • Spectrally matched comfort noise generator for Tx voice and comfort noise generator for Rx stream
Portable Codec
  • Integrated stereo 24 bit low power codec
    • 2 ADC, 98 dB SNR, -88 dB THD+N
    • 2 DAC, 98 dB SNR, -86 dB THD+N
  • Up to 96 kHz sample rate
  • Digital signal processing engine
  • Programmable automatic level control (ALC)
Speaker Amplifier
  • Hybrid Class-D architecture
    • 1.35 W into 8 ohms @ 1% THD+N
    • 98 dB SNR, 0.02% THD+N @ 1W
  • Over-temperature protection
  • Short-circuit protection
MEMS Microphone
  • Analog and digital
  • Top and bottom ports
  • Signal-to-noise ratio (SNR):
    • 65 dB [analog]
    • 63 dB [digital]
  • Acoustic overload point (AOP) @ 10% THD:
    • 130 dB SPL [analog]
    • 120 dB SPL [digital]
  • Sensitivity with ±1 dB tolerance:
    • -38 dBV/Pa [analog]
    • -26 dBFS/Pa [digital]

Portable Codecs

Supported Products
  • CS42L51
    Low-Power Stereo Codec with Headphone Amplifier
  • WM8993
    Codec with Stereo Speaker Drivers and Class W Headphone Driver

MEMS Microphones

Supported Products
  • WM7121PE
    Top Port Analog Silicon Microphone
  • WM7132PE
    Bottom Port Analog Silicon Microphone
  • WM7331E
    Bottom Port Analog Silicon Microphone
  • WM7216E
    Low Power Top Port Digital Silicon Microphone
  • WM7236E
    Bottom Port Digital Silicon Microphone

Class-D Speaker Amplifiers

Supported Products
  • CS35L00
    Low Power Class-D Audio Amplifiers
  • CS35L01/03
    Low Power Class-D Audio Amplifiers
  • CS35L32
    5 V Boosted Class-D Amplifier With Integrated Dual LED Drivers
ATS7101
ATS8102
Voice
  • 1 or 2-mic Headset TX NR
  • 1-mic Speakerphone TX NR
-
  • 1 or 2-mic Speakerphone TX AEC
  • RX NR & AVC
  • TX Comfort Noise (spectrally matched)
  • RX Comfort Noise
  • TX PEQ
  • RX PEQ
  • RX MBC
  • Dynamic RX Volume & EQ
  • Sidetone
-
Playback
  • Mono/Stereo 8/16/24/32/48 kHz Playback & PEQ
-
  • Virtual Stereo Surround
-
  • Multi-band Compressor
-
  • Context Aware Playback
-
  • Audio Volume & Trims
-
  • Tone Control
-
  • Bass Manager
-
  • Delay Manager
-
  • Band Xpander
-
  • Bass Enhancer
-
  • Dynamic Volume Leveler
-
  • Intelligent Room Calibration
-
  • Multi-channel Surround
-
  • Crossbar Mixer
-
  • Speaker Protection
-
  • Dolby Digital Post-processing Support
-
  • DTS Post-processing Support
-
Control
  • 1 Input Channel
-
  • 1 Output Channel
-
  • Single Trigger Word Detection
-
  • Seamless Trigger to Search
-
  • Sensory Engine Support
-
  • Uncompressed Audio Stream
-
  • ASR Enhance
-
  • Trigger Directed ASR
-
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