摘要:

In a previous paper, a simple filtering scheme based on delta modulation and using only coefficients 0, +1, and −1 was presented. In the present paper, those results are extended to highpass and bandpass filters and various techniques are presented to improve the performance of these filters. Examples are provided.

DOI:10.1049/ip-g-1.1981.0048

出版商:IEE    

年代:1981

数据来源: IET

摘要:

Simple CCD and switched-capacitor circuits are described which increase the sampling rate of signals, using linear interpolation.

DOI:10.1049/ip-g-1.1981.0049

出版商:IEE    

年代:1981

数据来源: IET

摘要:

The advantages of digital filters and reasons for their increasing application are given. The restricted-bandwidth problem in microprocessor-based digital filters and previous approaches to overcoming this problem are discussed. Finally, a flexible, high-speed implementation employing AM2900 bit-slice devices and a TRW multiplier is presented.

DOI:10.1049/ip-g-1.1981.0050

出版商:IEE    

年代:1981

数据来源: IET

摘要:

A multiple-parameter variable digital filter is proposed which is derived from periodically switched analogue networks. A bilinear expansion of the system matrix with pairwise commutative matrices leads to a structure in which the significant parameters can be tuned independently. This method is demonstrated by a 2nd-order digital filter section. As an example, the results of a 2-parameter tunable 3rd-order lowpass filter are presented.

DOI:10.1049/ip-g-1.1981.0051

出版商:IEE    

年代:1981

数据来源: IET

摘要:

During the previous few years, many high-speed LSI devices for signal processing have been introduced. This has made the problem of implementing digital filters, and wave digital filters (WDF) in particular, considerably easier. This paper briefly surveys the research carried out on LSI and non-LSI hardware implementations of WDF during the last few years. This paper also describes a modification to earlier work on LSI implementations that enables the realisation of WDF with poles of attenuation.

DOI:10.1049/ip-g-1.1981.0052

出版商:IEE    

年代:1981

数据来源: IET

摘要:

The switched-capacitor transconductance is used to simulate both grounded and floating inductors. Use of the elements is demonstrated on a switched-capacitor simulation of a 5th-orderLClowpass filter.

DOI:10.1049/ip-g-1.1981.0053

出版商:IEE    

年代:1981

数据来源: IET

摘要:

A method is described for synthesising ladder networks in which each element may be assigned arbitrary loss, within limits. The networks may be terminated in resistances at one or both ends or they may be terminated in impedances consisting of a resistance and inductance in parallel. The networks are of the Cauer ladder type in which the transfer characteristics realised are rational functions possessing complex transmission zeros.

DOI:10.1049/ip-g-1.1981.0054

出版商:IEE    

年代:1981

数据来源: IET

摘要:

Simple direct formulas are given for the design of 4th-order AT-cut resonators or monolithic dual filters. It is shown that the matching transformers or annulling coils are not required to achieve a desired impedance.

DOI:10.1049/ip-g-1.1981.0055

出版商:IEE    

年代:1981

数据来源: IET

摘要:

The paper describes the construction and limitations of a type of waveform corrector suitable for use on video systems in the local telephony network. Component values are included for route lengths up to 1.5 km.

DOI:10.1049/ip-g-1.1981.0056

出版商:IEE    

年代:1981

数据来源: IET