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7 records (took 0.021 seconds)

    1.
    发明专利
    未知

    公开(公告)号：DE602005018012D1

    公开(公告)日：2010-01-14

    申请号：DE602005018012

    申请日：2005-02-10

    Applicant: ST MICROELECTRONICS SRL

    Inventor： GROSSO ANTONIO ,  MERONI CRISTIANO ,  BOTTI EDOARDO

    IPC: H03M1/18

    Abstract: The dynamic range of operation of a digital-to-analog converter of an audio system, including at least first and second subsets of individually selectable elementary current sources for delivering analog output current contributions, a code conversion circuit for selecting elementary current sources of said subsets first and second in function of the value of each sampled code of a pulse code modulated input signal, is embedded by multiplying by a certain factor incoming digital codes of said pulse code modulated input signal after their value has remained lower than a predefined threshold value for a certain period of time and for as long as their value equals or surpasses than said threshold value and correspondingly scaling and de-scaling by the same factor the amplitude of said analog output current contributions produced by the elementary current sources of said two subsets.

    2.
    发明专利
    未知

    公开(公告)号：ITTO20000931D0

    公开(公告)日：2000-10-06

    申请号：ITTO20000931

    申请日：2000-10-06

    Applicant: ST MICROELECTRONICS SRL

    Inventor： BASCHIROTTO ANDREA ,  MERONI CRISTIANO ,  BOTTI EDOARDO ,  GHIONI MASSIMO

    IPC: H03M1/06 ,  H03M1/74

    Abstract: A method for digital-to-analog conversion of a digital input code into a first output analog signal and a second output analog signal to be supplied to a first terminal and a second terminal, respectively, of an audio load, the conversion being performed by means of a DAC with N-level balanced output, the conversion method includes using N/2 positive generator elements supplying respective positive elementary contributions which are nominally equal to one another, and N/2 negative generator elements supplying respective negative elementary contributions which are nominally equal to one another and, in absolute value, equal to the positive elementary contributions; attributing the same progressive addresses to the positive generator elements and to the negative generator elements; defining a first index for the positive input codes and a second index for the negative input codes; and, in the presence of an input code at the input of the DAC, selecting between the first index and the second index, the index corresponding to the sign of the input code; activating a first set of positive generator elements and a second set of negative generator elements, the number of the positive generator elements activated and the number of the negative generator elements activated being equal to one another and proportional to the input code, and the addresses of the positive generator elements activated and of the negative generator elements activated being a function of the selected index; generating the first output analog signal by summing the positive elementary contributions supplied by the positive generator elements activated, and generating the second output analog signal by summing the negative elementary contributions supplied by the negative generator elements activated; and updating the selected index according to the input code.

    3.
    发明专利
    未知

    公开(公告)号：IT1320694B1

    公开(公告)日：2003-12-10

    申请号：ITTO20000931

    申请日：2000-10-06

    Applicant: ST MICROELECTRONICS SRL

    Inventor： MERONI CRISTIANO ,  BOTTI EDOARDO ,  BASCHIROTTI ANDREA ,  GHIONI MASSIMO

    IPC: H03M1/06 ,  H03M1/74

    Abstract: A method for digital-to-analog conversion of a digital input code into a first output analog signal and a second output analog signal to be supplied to a first terminal and a second terminal, respectively, of an audio load, the conversion being performed by means of a DAC with N-level balanced output, the conversion method includes using N/2 positive generator elements supplying respective positive elementary contributions which are nominally equal to one another, and N/2 negative generator elements supplying respective negative elementary contributions which are nominally equal to one another and, in absolute value, equal to the positive elementary contributions; attributing the same progressive addresses to the positive generator elements and to the negative generator elements; defining a first index for the positive input codes and a second index for the negative input codes; and, in the presence of an input code at the input of the DAC, selecting between the first index and the second index, the index corresponding to the sign of the input code; activating a first set of positive generator elements and a second set of negative generator elements, the number of the positive generator elements activated and the number of the negative generator elements activated being equal to one another and proportional to the input code, and the addresses of the positive generator elements activated and of the negative generator elements activated being a function of the selected index; generating the first output analog signal by summing the positive elementary contributions supplied by the positive generator elements activated, and generating the second output analog signal by summing the negative elementary contributions supplied by the negative generator elements activated; and updating the selected index according to the input code.

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