Digital signal processing spectrum inversion for analog speech channels

Kishi, M.; Tajima, Jun; Kanmuri, N.; Seki, S.

doi:10.1109/t-vt.1983.23973

Cited by 6 publications

(1 citation statement)

References 3 publications

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“…This block is basically composed of an input low-pass filter, one local oscillator, a mixer, and an output low-pass filter [2], as shown in Figure 1(b), where the inversion of the first sub-band in Figure 1(a) at f o = f L + f split is considered. The input signal bandwidth is first limited to f split and is then mixed with the oscillator frequency f o = f L + f split .…”

Section: Introductionmentioning

confidence: 99%

An area‐efficient switched‐capacitor relaxation oscillator with digitally controlled frequency tunability

Ausin

Ramos

Torelli

et al. 2008

Circuit Theory & Apps

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SUMMARYThis paper describes a programmable low-jitter switched-capacitor (SC) square-wave oscillator for the use in a variety of voice-band signal-processing applications. The core of the circuit is a relaxation oscillator whose oscillation frequency programmability does not resort to variations either in capacitor values or in the sampling frequency. As a result, total capacitance is reduced and, hence, silicon area is minimized while low phase jitter and high resolution programmability are achieved. Simulation results referred to the design of an SC oscillator in 0.35-m CMOS technology are presented to demonstrate the feasibility of the proposed approach.

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Section: Introductionmentioning

confidence: 99%

An area‐efficient switched‐capacitor relaxation oscillator with digitally controlled frequency tunability

Ausin

Ramos

Torelli

et al. 2008

Circuit Theory & Apps

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Monsurrò

Pennisi

Scotti

et al. 2009

Circuit Theory & Apps

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Design of digital signal processing quadrature modulator for digital fm and analog FM signals

Yamao

1987

Electron. Comm. Jpn. Pt. I

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In the field of mobile communication, the transmission of picture and data signals in addition to conventional speech transmission requires modulators that are suitable to both analog and digital FM. In the present paper such a quadrature modulator is proposed which provides stable transmission characteristics by digital signal processing (DSP) techniques. The analysis is mainly aimed at additional noise effects due to the digital generation of analog FM signals. The relations between the sampling frequency used in the D‐A conversion of analog speech signals and the sideband noises accompanying modulation are developed. The relations are given between the number of bits used for quantization in the A‐D conversion and the baseband signal/noise ratio in the case of FM or PM reception of the analog FM wave generated by the proposed modulator. Based on the results of this analysis, a modulator design method providing sufficiently high noise suppression is presented in a flowchart form. The results of measurement of a quadrature modulator realized by the proposed method are shown to agree well with the results of analysis. The agreement demonstrates that the required modulator characteristics can be obtained without tuning.

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Digital signal processing spectrum inversion for analog speech channels

Cited by 6 publications

References 3 publications

An area‐efficient switched‐capacitor relaxation oscillator with digitally controlled frequency tunability

An area‐efficient switched‐capacitor relaxation oscillator with digitally controlled frequency tunability

Untitled

Design of digital signal processing quadrature modulator for digital fm and analog FM signals

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