前苏联专利SU1132805A3 Digital-to-analog converter

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专利摘要:
1444216 Digital - to - analogue conversion STANDARD TELEPHONES & CABLES Ltd 20 Feb 1975 7157/75 Heading H3H An analogue output is derived from a P.C.M. signal by increasing its sampling rate in interpolator 1, converting only the most significant bits to a pulse density signal in a rate-multiplier 3, and low-pass filtering 4 to give the analogue output. Noise is reduced by feeding back the least significant bits through a filter 12. The filter may comprise one or more delays whose outputs are combined with different weighting factors: several examples are described, Figs. 4, 8, 10, 11, not shown. The interpolator may be simply a recirculating register, Fig. 6, not shown, for merely repeating each P.C.M. word, e.g. 32 times or may be a linear interpolator, Fig. 7, not shown. D-to-A converter 3 comprises a synchronous binary counter 5, Fig. 2, fed with fast clock pulses fc, binarily weighted frequencies being obtained at its outputs A, B, C, D which are gated by the 4 most significant bits of the interpolated P.C.M. signal to produce a pulse train E of mean density corresponding to these 4 bits.
公开号:SU1132805A3
申请号:SU762309106
申请日:1976-01-08
公开日:1984-12-30
发明作者:Джон Джинджелл Майкл
申请人:Интернэшнл Стандарт Электрик Корпорейшн (Инопредприятие)；
IPC主号:

专利说明:

The invention relates to the field of] pulse technology and can be used in communication systems with code-pulse modulation.
Known digital-to-analog Converter containing precision resistors, a reference voltage source ^ keys and an operational amplifier [1]
This converter is difficult to manufacture; since to achieve high accuracy, individual adjustment of precision resistors is required.
Also known digital-to-analog Converter containing a frequency multiplier, the output of which is connected to the input of the low-pass filter, the output of which is connected to the output bus [2].
The disadvantage of this converter is the limited accuracy due to the errors of the analog elements (precision resistors and keys) used in the device. ;
The purpose of the invention is improving the accuracy of the conversion.
The set goal is achieved by the fact that in digital-analog; a converter containing a frequency multiplier whose output is connected to the input of a low-pass filter, the output of which is connected to the output bus, a selection block, an adder, a comparator, an error signal filter, and an interpolator are introduced, the output of which is connected to the first input of the adder, the output of which connected to the input of the selection block and the first input of the comparator, the second input of which is connected to the output of the selection block and the input of the frequency multiplier, and the output through the error signal filter to the second input of the adder.
The drawing shows a structural diagram of a device.
The converter contains a series-connected interpolator 1, adder 2, block 3 selection, frequency multiplier 4, filter 5 low

权利要求:
Claims (1)
[1]
DIGITAL ANALOG CONVERTER, contains a frequency multiplier whose output is connected to the input of a low-pass filter, the output of which is connected to the output bus, which is characterized by the fact that, in order to increase the accuracy of the conversion. In this case, a selection block, an adder, a comparator, an error signal filter, and an interpolator are inserted into it, the output of which is connected to the first input of the adder, the output of which is connected to the input of the selection block and the first input of the comparator, the second input of which is connected to the output of the selection block and the input of the multiplier frequency, and the output is through the filter of the error signal to the second input of the adder.
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引用文献:

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

US3110894A|1959-04-09|1963-11-12|Itt|Digital-to-analog converter|

US3532864A|1967-08-08|1970-10-06|United Aircraft Corp|Linear interpolation function generation|JPS5751295B2|1975-08-28|1982-11-01|

GB1580447A|1976-12-01|1980-12-03|Post Office|Code converters|

NL7801909A|1978-02-21|1979-08-23|Philips Nv|DEVICE FOR DECODING A SIGNAL CODED WITH ADAPTIVE DELTA MODULATION.|

DE3021012C2|1980-06-03|1985-08-22|ANT Nachrichtentechnik GmbH, 7150 Backnang|Generalized interpolative method for the digital-analog conversion of PCM signals|

US4313173A|1980-06-10|1982-01-26|Bell Telephone Laboratories, Incorporated|Linear interpolator|

GB2107949B|1981-10-15|1985-04-11|Standard Telephones Cables Ltd|Digital decoder|

DE3203012C2|1982-01-29|1990-08-16|Siemens Ag, 1000 Berlin Und 8000 Muenchen, De|

US4786923A|1982-09-07|1988-11-22|Canon Kabushiki Kaisha|Image recording system for image recording in response to signals entered from a recording information generating unit|

EP0437301A3|1983-07-29|1991-09-25|Burr-Brown Corporation|Apparatus and methods for digital-to-analogue conversion|

DE3535021C2|1984-10-02|1989-10-19|Canon K.K., Tokio/Tokyo, Jp|

GB2183115A|1985-11-15|1987-05-28|Philips Electronic Associated|Digital to analogue converter|

DE3709207A1|1987-02-28|1988-09-08|Standard Elektrik Lorenz Ag|CIRCUIT ARRANGEMENT FOR CONVERTING DIGITAL TONE SIGNAL VALUES TO ANALOG TONE|

GB9103777D0|1991-02-22|1991-04-10|B & W Loudspeakers|Analogue and digital convertors|

GB2319411B|1996-11-18|2000-11-15|Fujitsu Ltd|Modem signal transmission and/or reception apparatus|

法律状态:

优先权:

申请号 | 申请日 | 专利标题

GB715775A|GB1444216A|1975-02-20|1975-02-20|D/a converter for pcm|

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