Gain varying device capable of varying each gain of analog and digital signals
AssigneeSony Corporation
InventorsTakuji Himeno, Hiroshi Takahata
Life of this patent
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Abstract
A gain varying device includes a zero-cross detector for detecting a zero cross or a vicinity thereof in an input analog or digital signal, an analog gain varier for varying the gain of the input analog signal, and a digital gain varier for varying the gain of the input digital signal. In this device, the timing to vary the gain of the analog or digital signal in the individual gain varier is determined in accordance with the zero-cross detection timing, so that smooth switching can be realized in the gain varying operation without generation of any audible noise.
Claims11
A gain varying device comprising:
- analog gain varying means for varying a gain of an input analog signal;
- zero-cross detector means for detecting a zero cross in the input analog signal;
- analog-digital converter means for converting into a digital signal the analog signal from said analog gain varying means;
- digital gain varying means for varying a gain of the digital signal converted by said analog-digital converter means;
- and
- control means for controlling gain variation timing of said analog gain varying means and gain variation timing of said digital gain varying means in response to zero-cross timing detected by said zero-cross dectector means, wherein the gain variation timing by the digital and analog gain varying means are separated by a predetermined time interval.
A gain varying device comprising:
- analog gain varying means for varying a gain of an input analog signal;
- analog-digital converter means for converting into a digital signal an analog signal from said analog gain varying means;
- zero-cross detector means for detecting a zero cross or a signal level in a vicinity thereof in the digital signal from said analog-digital converter means;
- digital gain varying means for varying a gain of the digital signal from said analog-digital converter means;
- transfer means for transferring predetermined communication data to said analog gain varying means and to said digital gain varying means;
- and
- control means for selectively permitting transfer or inhibiting transfer of the communication data from said transfer means to said analog gain varying means in response to a timing of the detected zero cross or signal level in the vicinity thereof detected by said zero-cross detector means, wherein said communication data is transferred to said analog gain varying means after a predetermined time delay.
A gain varying device comprising:
- zero-cross detector means for detecting a zero cross or a signal level in a vicinity thereof in an input digital signal;
- digital-analog converter means for converting the input digital signal into an analog signal;
- analog gain varying means for varying a gain of the analog signal converted by said digital-analog converter means;
- and
- control means for switching and controlling a gain variation timing of said analog gain varying means in response to an output of said zero-cross detector means.
Dependencies are inferred from the claim text.