Speech signal transmitting and receiving apparatus with noise sensitive volume control
DCFirst Claim
1. A speech signal transmitting and receiving apparatus comprising:
- a speech signal encoder for compressing input speech signals by digital signal processing for high quality voice transmission at a low bit rate and for producing patterns of analytic parameters from the input speech signal;
a transmitting and receiving circuit for transmitting the compressed speech signals output by said speech signal encoder and for receiving compressed speech signals transmitted from another transmitter and reproducing a corresponding received sound;
noise domain detection means supplied with patterns of analytic parameters produced by said speech signal encoder during compression of the input speech signals for determining a noise domain in which only noise exists in the input speech signal;
noise level detecting means for detecting a noise level of the input speech signal in the noise domain; and
means for controlling a volume of the corresponding received sound responsive to the noise level detected by said noise domain detection means.
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Abstract
A speech signal transmitting receiving apparatus, such as a portable telephone set, includes a speech signal transmitting encoding circuit, a noise domain detection unit, a noise level detection unit and a controller. The speech signal transmitting encoding circuit compresses input speech signals by digital signal processing at a high efficiency. The noise domain detection unit detects the noise domain using an analytic pattern produced by the speech signal transmitting encoding circuit. The noise level detection unit detects the noise level of the noise domain detected by the noise domain detection unit. The controller controls the received sound volume responsive to the noise level detected by the noise level detection unit.
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Citations
22 Claims
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1. A speech signal transmitting and receiving apparatus comprising:
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a speech signal encoder for compressing input speech signals by digital signal processing for high quality voice transmission at a low bit rate and for producing patterns of analytic parameters from the input speech signal; a transmitting and receiving circuit for transmitting the compressed speech signals output by said speech signal encoder and for receiving compressed speech signals transmitted from another transmitter and reproducing a corresponding received sound; noise domain detection means supplied with patterns of analytic parameters produced by said speech signal encoder during compression of the input speech signals for determining a noise domain in which only noise exists in the input speech signal; noise level detecting means for detecting a noise level of the input speech signal in the noise domain; and means for controlling a volume of the corresponding received sound responsive to the noise level detected by said noise domain detection means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A speech signal transmitting and receiving apparatus having a transmitter and a receiver, comprising:
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noise level detection means for detecting a sound signal level entering a transmitting microphone as a noise level when there is no transmitting speech input at said transmitter; and control means for controlling a volume of sound reproduced from a compressed speech signal received from another transmitter responsive to the noise level detected by said noise level detection means. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification