• Title/Summary/Keyword: FM SIGNAL

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Interference of FDM-FM Signal upon PSK Signal (PSK 신호에 대한 FDM-FM 신호의 섭간영향)

  • 이형재;이대령;조성준
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.6 no.1
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    • pp.21-26
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    • 1981
  • The effect of wideband FDM-FM signal on binary CPSK signal in an interchannel interference environment has been investigated. A general equation of the bir error rate of binary CPSK signal with cochannel and adjacent channel interference from FDM-FM signal has been derived. The numerical results are given in graphs as the functions of carrier to noise ratio (CNR), carrier to interference ratio(CIR) and normalized carrier separation between PSK and FM signals. The results obtained can be used om desogmomg tje freqiemcy allocation, bandwidths and powers of PSK and FM signals in same radio frequency (RF) bands.

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A study on the interference on FM Radio channel from HD Radio signal (HD Radio에 의한 FM 방송의 간섭 연구)

  • Lee, Sang-Woon
    • Journal of Satellite, Information and Communications
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    • v.7 no.1
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    • pp.122-127
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    • 2012
  • The purpose of this study is to know about the interference on FM Radio channel from HD Radio signal. In Korea, a data service channel, named DARC is operated by a major FM radio broadcaster which has national wide service area. Therefore, an analysis of the interference on FM radio channel with DARC data channel from HD Radio, most recently developed digital radio system. Technical parameters of FM radio with DARC data channel and HD Radio system are considered for this simulation. As results some interference generated because of HD Radio signal according to its signal allocation and service mode of HD Radio.

Decomposition of Speech Signal into AM-FM Components Using Varialle Bandwidth Filter (가변 대역폭 필터를 이용한 음성신호의 AM-FM 성분 분리에 관한 연구)

  • Song, Min;Lee, He-Young
    • Speech Sciences
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    • v.8 no.4
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    • pp.45-58
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    • 2001
  • Modulated components of a speech signal are frequently used for speech coding, speech recognition, and speech synthesis. Time-frequency representation (TFR) reveals some information about instantaneous frequency, instantaneous bandwidth and boundary of each component of the considering speech signal. In many cases, the extraction of AM-FM components corresponding to instantaneous frequencies is difficult since the Fourier spectra of the components with time-varying instantaneous frequency are overlapped each other in Fourier frequency domain. In this paper, an efficient method decomposing speech signal into AM-FM components is proposed. A variable bandwidth filter is developed for the decomposition of speech signals with time-varying instantaneous frequencies. The variable bandwidth filter can extract AM-FM components of a speech signal whose TFRs are not overlapped in timefrequency domain. Also, amplitude and instantaneous frequency of the decomposed components are estimated by using Hilbert transform.

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Implementation of DS/SS(FM-DS/SS) system using FM (FM을 이용한 DS/SS(FM-DS/SS) 시스템의 구현)

  • 정명덕;박지언;변건식
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.9 no.1
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    • pp.98-107
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    • 1998
  • For implementation of FM-DS/SS system. This paper has analyzed SO(Synchronous Oscillator) being oscillated by the motivation of injected signal. Transmitter has adopted FM-DS/SS modulation method using RF output-signal of FM. Receiver is used SO to demodulation of FM-DS/SS and applied sliding correlator for synchronization of PN clock. As a result of the inspection, SO presented stable lock ability in spite of doppler apperance and proved the synchronous properties of it in the FM-DS/SS system.

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Intersystem Interference between Analog and Digital Communication Systems, Part 1: Interference into PSK signal from FDM-FM signal (아나로그 및 디지탈 무선통신 시스템간의 간섭 영향 -PSK 신호에 미치는 FM 신호의 간섭-)

  • 조성준
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.15 no.6
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    • pp.29-34
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    • 1978
  • It has been investigated that the elect of an wideband FDM-FM signal upon an M-ary coherent PSK (MCPSK) signal in an intersystem radio interference environment between analog and digital systems, which had not been discussed before and had been obscure. It is assumed that PSK and FM signal are adjacently allocated in same radio frequency band. And the symbol error performance of MCPSK signal with co-channel and adjacent channel interference from an FDM-FM signal is evaluated with considering the receiver noise. The numerical results for the theoretical symbol error rates of MCPSK system in the presence of Gaussian noise and co-channel or adjacent channel interference are given in graphical forms as the function of carrier-to-noise ratio (CNR), carrier-to-interference ratio (CIR) and normalized carrier separation between the desired PSK and interfering FM signal. The objective of this research is to find some optimal conditions for coexistence of analog and digital systems in an intersystem interference environment. The results we obtained here stress a possible utilization of them for designing the frequency allocation, bandwidth and power of PSK channel in the intersystem interference from an FDM-FM signall.

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Characteristics of Echolocation Calls of the Parti-coloured Bat, Vespertilio sinensis, in Relation to Environment Type (환경특성에 따른 안주애기박쥐(Vespertilio sinensis)의 반향정위 특징)

  • Chung, Chul-Un;Han, Sang-Hoon
    • Journal of Environmental Science International
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    • v.24 no.3
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    • pp.353-358
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    • 2015
  • In this study, we analyzed two types of echolocation calls used by the parti-coloured bat, Vespertilio sinensis. Bats were captured in the Naejangsan National Park in October 2013. Call sounds of hand-released bats were recorded at the location of capture within the National Park. We analyzed pulse duration (PD), pulse interval (PI), peak frequency (PF), maximum frequency ($F_{MAX}$), minimum frequency ($F_{MIN}$), and bandwidth (BW). V. sinensis emitted the different types of the echolocation calls depending on the surrounding environment. Frequency modulated-constant frequency (FM-CF) signal of audible range was emitted when they flew in the uncluttered space over the canopy. However, when flying in the cluttered space below the canopy, they only emitted FM signal. FM-CF signal is in the audible range (e.g., low frequency), and FM signal has a harmonic broadband frequency range of two. There were significant differences in PD, PI, PF, FMAX, FMIN, and BW between the calls emitted over and below the canopy. Considering the functional characteristics of FM and CF signals, we conclude that the foraging activity of V. sinensis was observed below the canopy, and recommend the use of FM signal and broadband as echolocation signals.

FM Data transmission through optical fiber

  • Rabou, N.A.;Ikeda, H.;Yoshida, H.;Shinohara, S.;Tsuchiya, E.
    • 제어로봇시스템학회:학술대회논문집
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    • 1990.10b
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    • pp.1119-1122
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    • 1990
  • Presnted is a new optical transmission system to transmit the FM control signal (80 MHz) through an optical fiber by the use of an inexpensive LED having a cutoff frequency of as low as 30 MHz. Studies are carried out on the division of the FM signal frequency at 80 MHz by a factor of four. The FM signal frequency is, after the transmission through the optical fiber, then multiplied by a factor of four so as to obtain the normal FM control signal.

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RADIO FREQUENCY INTERFERENCE FROM FDM-FM SIGNALS ON QAM SIGNAL - DATA IN VOICE CASE - (QAM 신호에 대한 FDM-FM 신호의 간섭 영향 - Data In Voice의 경우-)

  • Ko, Bong-Jin;Cho, Sung-Joon
    • Proceedings of the KIEE Conference
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    • 1987.07b
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    • pp.864-868
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    • 1987
  • In this paper we have Investigated the effects of two wideband FDM-FM signals on n-ary QAM signal allocated between FDM-FM signals (in DIV case). Here, we assumed that the instantaneous frequency distribution of wideband FDM-FM signal is Gaussian. The numerical results of symbol error rate are given in graphs as the parameters of carrier to noise ratio (CNR), carrier to interference ratio (CIR) and normalized carrier separation between QAM and FDM-FM carrier frequencies.

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Implementation of a digital FM composite signal generator (디지털 방식 FM 합성 신호 발생기의 구현)

  • 정도영;김대용;유영갑
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.23 no.5
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    • pp.1349-1359
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    • 1998
  • In this paper, presented is the result of a digital implementation of a FM stereo composite signal generator. The chip utilizing DDFS(Direct Digital Frequency Synthesizer architecture is implemented using $1.0\mu\textrm{m}$ CMOS gate-array technology thereby replacing analog componentry. To verify the process of generating composite signals a conventional logic simulation method was used. The processed chip was mounted on an evaluation PCB to test and analyze to signals. According to the measurement result obtained by using a 12-bit DAC, the digital FM composite signal generator produces a 74DB spectrally pure signal over its entire tuning range, which is superior to that of analog counterpart by 14dB in it spectral reponse. And further enhancements of the spectral response is expected to be achieved by using a high resolution digital to analog converter, such as a 16-bit DAC. The resulting signals is superior to the signal of the analoy circuitry typically used, in major characteristics such as S/N ratios, accuracy, tuning stability, and signal seperation.

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A study on the interference on FM Radio channel from DRM+ signal (DRM+에 의한 FM 라디오 방송채널의 간섭 연구)

  • Lee, Sang-Woon
    • Journal of Satellite, Information and Communications
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    • v.6 no.2
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    • pp.35-40
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    • 2011
  • The purpose of this study is to know about the interference on FM Radio channel from DRM+ signal. In Korea, a data service channel, named DARC is operated by a major FM radio broadcaster which has national wide service area. Therefore, an analysis of the interference on FM radio channel with DARC data channel from DRM+, most recently developed digital radio system. Technical parameters of FM radio with DARC data channel and DRM+ system are considered for this simulation. To maintain without no interference from DRM+, FM radio channel with DARC data channel should have the power level difference over 14.7dB at 150KHz frequency distance.