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Developing a chip that can support phone conversations with just an earphone.
Earphone Mic Solutions
What is an earphone mic?
SANYO is developing a chip that can support phone conversations
with just an earphone.
Conversation is possible without taking off your earphones.
STFD (single transduce full duplex) technology makes a separate microphone unnecessary!
Increased flexibility in end product design
Phone conversions are possible even in crowds or noisy environments
Since the sound is picked up directly in the ear, wind and other sounds can be reduced.
Better audio quality than bone conduction microphones
Since an even clearer voice sound is possible, it is easy to identify the speaker.
New applications in various other wireless markets
Phone conversations are possible without removing one's earphones when listening to music.
Single Transducer Full Duplex
S.T.F.D.
Tympanic
The headphone diaphragm
catches the weak audio
signal emitted from
the tympanic
Tympanic
Vibrations in the air
Vocalization
Transmission
Reception
24
Under development
Diaphragm
Simultaneous transmission and
reception at a single diaphragm
To the
circuit
Signal conversion using a DSP.
Vibrations in the air
Signal transmission while maintaining clarity.
Higher audio
quality
Bone conduction
microphones
Hands free
Development roadmap
First generation
For business equipment
Evaluation board verification
For PC peripherals
STFD function confirmation
For portable accessories
Integration
Functions
• STFD
• Volume
STDF evaluation board
2005
2006
Wind sounds
Noise is reduced
Earphone mic
There are also
new applications
Resistant to noise
Second generation
For portable equipment
For wireless equipment
Lower power consumption
Higher functionality
Added functionality
• Noise canceler
• Speach speed conversion
• Hands free
2007
25
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