User Manual

Unified Communications Microphone & Speaker System

YVC-1000 White Paper

implemented, all of the YVC-1000’s acoustic settings are optimized via the reproduction of the measuring sounds.

● Adjustment with an external speaker connected

This function is particularly useful when connecting an external speaker since the difference in delay between the

external and built-in speakers and frequency response can be corrected. (Refer to 3) to 4) of 2.2 in Chapter 3.)

If YVC-1000 detects acoustic problems during normal operations, or during the automatic audio tuning processes,

the users are notified of the anomalies and their causes via the lighting up and blinking of the tuning fork’s button,

and the audio guidance. With conventional conference microphone and speaker systems, what was causing the

voice degradations as in the following example could not be picked out, thus users had difficulty in dealing with

those causes. However since YVC-1000 specifies those causes and notifies the users of them, tiptop conditions can

be brought to conferences.

2.2 Operations and mechanisms

The automatic audio tuning function optimizes the following four function parameters by learning about the

acoustic environment in a room where it works.

1) Adaptive echo canceller

2) Automatic room EQ

3) Correction of the difference in delay between built-in and external speakers

4) Correction for the frequency response of external speaker(s)

1) Adaptive echo canceller

YVC-1000's echo canceller is a filter-type adaptive echo canceller that learns about the acoustic characteristics

between the speakers and microphones. Since this is different than a suppressor type echo canceller, both parties

can simultaneously hold pleasant conversations. When the automatic audio tuning functions are implemented, the

measuring sounds are reproduced from the speakers, and because the adaptive filter can sufficiently learn by this,

this can bring to conferences a simultaneous conversation efficiency by both parties which is optimized

immediately after conversing has started.

2) Automatic room EQ

In normal operation, automatic room EQ calculates the optimal parameter settings for approximately several tens of

seconds to several minutes while gradually adapting to the operating environment. Upon execution of the

automatic audio tuning function, the measuring sounds are reproduced from the speakers to immediately update

the optimal settings of automatic room EQ parameters. This allows YVC-1000 to reproduce voices with the best

audio quality from the start of conferences.

3) Correction of the difference in delay between the built-in and external speakers

If any delay between the input and output of external speakers exists (e.g. when using a TV as an external speaker),

it may cause a time lag between the voices being simultaneously reproduced from the external and built-in

speakers. The delay times of external speakers are measured by executing the automatic audio tuning function.