| 摘要 |
The preferred embodiments of the present invention generally improve communications capabilities between at least two devices (arbitrarily called local and remote). In the preferred embodiments of the present invention, the signal levels of communication are adjusted in response to a change between and/or among a plurality of modes. The adjusted signal levels affect not only received signal levels, but also received noise levels of echo. Even after echo cancellation is attempted, imperfect echo cancellation leaves residual echo noise. Thus, adjusting signal levels also adjusts noise levels of residual echo noise. This change in signal levels and the resulting change in residual echo noise leads to a change in signal-to-noise ratios in response to the devices changing between and/or among the plurality of modes. The communication system can be changed to maximize performance over the communication channels with specific signal-to-noise ratios that are established during the plurality of modes.
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