JPH07162325A - Fm receiver - Google Patents
Fm receiverInfo
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- JPH07162325A JPH07162325A JP5338892A JP33889293A JPH07162325A JP H07162325 A JPH07162325 A JP H07162325A JP 5338892 A JP5338892 A JP 5338892A JP 33889293 A JP33889293 A JP 33889293A JP H07162325 A JPH07162325 A JP H07162325A
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- pdm
- wave
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Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はPDM波(パルス密度変
調波)の復調装置を有するFM受信装置に関し、特に、
FM受信装置にパルスカウント型の復調器を用いる際に
弱電界で生ずる欠落パルスの補間手段に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FM receiver having a demodulator for PDM waves (pulse density modulated waves), and
The present invention relates to an interpolating means for a missing pulse generated in a weak electric field when a pulse counting demodulator is used in an FM receiver.
【0002】[0002]
【従来の技術】図4は従来のPDM波復調器の基本的な
構成例を示すブロック図であるが、この場合はFM波1
をゼロクロス検出器2でゼロクロス検出し、PDM波3
を得てLPF(ローパスフィルタ)100を通してベー
スバンド信号30を得る。FM受信装置でIF(中間周
波数)信号のゼロクロスを取り出すと、図3(a)に示
すPDM波となる。図3(a)では時刻t1,t2,t
3,…,t7までのPDM波が示されている。2. Description of the Related Art FIG. 4 is a block diagram showing a basic configuration example of a conventional PDM wave demodulator. In this case, an FM wave 1 is used.
Is detected by the zero cross detector 2 and the PDM wave 3
Then, the baseband signal 30 is obtained through the LPF (low pass filter) 100. When the zero cross of the IF (intermediate frequency) signal is taken out by the FM receiver, the PDM wave shown in FIG. In FIG. 3A, times t1, t2, t
PDM waves up to 3, ..., t7 are shown.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、FM受
信装置では弱電界になるとノイズが付加され、そのゼロ
クロスを取ると図3(a)’のようにパルスが欠落する
場合が生ずる(図3(a’)の例ではt=t5で欠落が
生じている)。PDM波の復調器では図3(a)及び図
3(a’)に示すようなパルス列をLPF(低域フィル
タ)でベースバンド信号に復元するので図3(a’)の
ようなパルスの欠落はベースバンド信号に大きなノイズ
として表れ、FM受信機では受信感度の低下の要因とな
るという問題点があった。すなわち、FM受信装置のパ
ルスカウント型などにおけるPDM波の復調時にPDM
波を構成するパルスが欠落すると復調したベースバンド
信号はノイズを伴うので著しく質が劣化するという問題
点があった。However, in the FM receiver, when a weak electric field is generated, noise is added, and when the zero cross is taken, a pulse may be missing as shown in FIG. 3 (a) '(see FIG. 3 (a)). In the example of '), a dropout occurs at t = t5). In a PDM wave demodulator, a pulse train as shown in FIGS. 3 (a) and 3 (a ') is restored to a baseband signal by an LPF (low-pass filter). Therefore, a pulse as shown in FIG. 3 (a') is missing. Has a problem in that it appears as a large noise in the baseband signal, which causes a decrease in reception sensitivity in the FM receiver. That is, when the PDM wave is demodulated in the pulse counting type of the FM receiver,
There is a problem in that the quality of the demodulated baseband signal is significantly deteriorated because the demodulated baseband signal is accompanied by noise when the pulses forming the wave are lost.
【0004】本発明は上記問題点に鑑みてなされたもの
であり、パルスカウント型のFM受信装置におけるPD
M波の復調において、PDM波に欠落パルスが存在する
とき、その欠落パルスを補間して質のよいベースバンド
信号の復調を可能とするPDM波の復調装置を提供する
ことを目的とする。The present invention has been made in view of the above problems, and a PD in a pulse count type FM receiver is provided.
An object of the present invention is to provide a PDM wave demodulation device capable of demodulating a high-quality baseband signal by interpolating the missing pulse in the PDM wave when demodulating the M wave.
【0005】[0005]
【課題を解決するための手段】上記の目的を達成するた
めに第1の発明のFM受信装置は、PDM信号をパルス
間隔の大きさに比例した振幅の信号に変換するPDM信
号変換手段と、PDM信号変換手段の出力からパルス列
を作成する第1のパルス列作成手段と、第1のパルス列
作成手段から出力されるパルスのピーク値を保持して次
のパルスのタイミングで該ピーク値を出力するピーク値
保持手段と、出力されたピーク値とPDM信号変換手段
との差信号から正極成分のパルス列を得る第2のパルス
列作成手段と、正極成分のパルス列を前記第1のパルス
列作成手段からの出力パルスで制御して補間パルスを抽
出する補間パルス抽出手段と、補間パルスとPDM信号
を合成して補間PDM信号を得る信号合成手段と、を有
することを特徴とする。In order to achieve the above object, the FM receiver of the first invention comprises a PDM signal converting means for converting a PDM signal into a signal having an amplitude proportional to the size of the pulse interval. First pulse train creating means for creating a pulse train from the output of the PDM signal converting means, and a peak for holding the peak value of the pulse output from the first pulse train creating means and outputting the peak value at the timing of the next pulse Value holding means, second pulse train creating means for obtaining a pulse train of the positive component from the difference signal between the output peak value and the PDM signal converting means, and a pulse train for the positive component of the output pulse from the first pulse train creating means And an interpolating pulse extracting means for extracting the interpolating pulse by controlling with the above, and a signal synthesizing means for synthesizing the interpolating pulse and the PDM signal to obtain the interpolating PDM signal. That.
【0006】第2の発明のFM受信装置は、パルスカウ
ント方式のFM受信装置において、FM波をパルス列に
変換する信号変換手段を有することを特徴とする。An FM receiving apparatus of the second invention is a pulse counting type FM receiving apparatus, characterized in that it has a signal converting means for converting an FM wave into a pulse train.
【0007】[0007]
【作用】上記の目的を達成するために第1の発明のFM
受信装置は、PDM信号変換手段によりPDM信号をパ
ルス間隔の大きさに比例した振幅の信号に変換し、第1
のパルス列作成手段によりPDM信号変換手段の出力か
らパルス列を作成し、ピーク値保持手段により第1のパ
ルス列作成手段から出力されるパルスのピーク値を保持
して次のパルスのタイミングで該ピーク値を出力し、第
2のパルス列作成手段により出力されたピーク値とPD
M信号変換手段との差信号から正極成分のパルス列を得
て、補間パルス抽出手段により正極成分のパルス列を前
記第1のパルス列作成手段からの出力パルスで制御して
補間パルスを抽出し、信号合成手段により補間パルスと
PDM信号を合成して補間PDM信号を得る。これによ
り、入力したPDM波に欠落パルスがある場合、欠落パ
ルスを補間して補間PDM波を作り、その補間PDM波
から復調信号を得る。In order to achieve the above object, the FM of the first invention
The receiving device converts the PDM signal into a signal having an amplitude proportional to the magnitude of the pulse interval by the PDM signal converting means, and first
Pulse train creating means creates a pulse train from the output of the PDM signal converting means, the peak value holding means holds the peak value of the pulse output from the first pulse train creating means, and the peak value is set at the timing of the next pulse. The peak value output by the second pulse train creating means and the PD
A pulse train of the positive component is obtained from the difference signal from the M signal converting means, and the pulse train of the positive component is controlled by the output pulse from the first pulse train creating means by the interpolation pulse extracting means to extract the interpolation pulse and synthesize the signal. The interpolating pulse and the PDM signal are combined by means to obtain an interpolating PDM signal. Thus, when the input PDM wave has a missing pulse, the missing pulse is interpolated to form an interpolated PDM wave, and a demodulation signal is obtained from the interpolated PDM wave.
【0008】第2の発明のFM受信装置は、パルスカウ
ント方式のFM受信装置において、信号変換手段により
FM波をパルス列に変換し、請求項1記載のPDM波の
復調装置により弱電界においてFM波のパルス列に欠落
パルスが生じた場合、欠落パルスを補間して補間PDM
波を作り、その補間PDM波から復調信号を得る。The FM receiving apparatus of the second invention is a pulse counting type FM receiving apparatus, wherein the signal converting means converts the FM wave into a pulse train, and the PDM wave demodulating apparatus according to claim 1 uses the FM wave in a weak electric field. If a missing pulse occurs in the pulse train of, the missing pulse is interpolated to interpolate PDM
A wave is created and a demodulated signal is obtained from the interpolated PDM wave.
【0009】[0009]
【実施例】図1は本発明に基づくFM受信措置における
PDM波の復調装置の一実施例の構成を示すブロック図
であり、50はPDM波補間回路である。図1で、FM
波1をゼロクロス検出器2でゼロクロス検出し、PDM
波3を得てPDM補間回路で欠落信号位置の近傍位置に
補間パルスを生成して補間PDM波3’を作り、補間P
DM波3’をLPF(ローパスフィルタ)100を通し
てベースバンド信号30を得る。以下、パルスカウント
型復調を用いるFM受信装置に適用するPDM波の復調
装置について述べるが、以下の説明ではFM波(IF信
号)のゼロクロスを取り出した以降〜復調する前のPD
M波の補間処理について説明する。1 is a block diagram showing the configuration of an embodiment of a PDM wave demodulating device in an FM receiving apparatus according to the present invention, and 50 is a PDM wave interpolating circuit. In Figure 1, FM
Wave 1 is detected by zero cross detector 2 and PDM
Wave 3 is obtained, an interpolation pulse is generated at a position near the missing signal position by the PDM interpolation circuit, an interpolation PDM wave 3'is created, and an interpolation P
A baseband signal 30 is obtained by passing the DM wave 3 ′ through an LPF (low pass filter) 100. Hereinafter, a PDM wave demodulator applied to an FM receiver that uses pulse count type demodulation will be described. In the following description, the PD after the zero cross of the FM wave (IF signal) is taken out to before the demodulation is performed.
The M wave interpolation process will be described.
【0010】図2は、本発明に基づくPDM波の復調装
置のPDM波補間回路50の一実施例の構成を示すブロ
ック図であり、3はPDM波(欠落信号を含む)、4は
電子スイッチ、5は定電圧源、6は抵抗、7はコンデン
サ、8は遅延時間τ1の遅延回路、9は差動増幅器、1
0はボックスカー回路でありピーク保持手段に相当し、
11は差動増幅器+スライサ、12はパルス出力、13
は鋸波、14は遅延時間τ2の遅延回路、15は差動増
幅器、16は整流素子、17,18は遅延時間τmin/
2の遅延回路、19はゲート回路であり補間パルス抽出
手段に相当し、20は加算回路であり合成手段に相当
し、3’は補間後のPDM信号(補間PDM信号)であ
る。FIG. 2 is a block diagram showing a configuration of an embodiment of a PDM wave interpolation circuit 50 of a PDM wave demodulation device according to the present invention. 3 is a PDM wave (including a missing signal), 4 is an electronic switch. 5 is a constant voltage source, 6 is a resistor, 7 is a capacitor, 8 is a delay circuit with a delay time τ1, 9 is a differential amplifier, 1
0 is a boxcar circuit, which corresponds to peak holding means,
11 is a differential amplifier + slicer, 12 is a pulse output, 13
Is a sawtooth wave, 14 is a delay circuit having a delay time τ2, 15 is a differential amplifier, 16 is a rectifying element, and 17 and 18 are delay times τ min /
Reference numeral 2 is a delay circuit, 19 is a gate circuit and corresponds to an interpolation pulse extracting means, 20 is an adding circuit and corresponds to a combining means, and 3'is an interpolated PDM signal (interpolated PDM signal).
【0011】また、本実施例では、電子スイッチ4、定
電圧源5、抵抗6、及びコンデンサ7はPDM信号変換
手段を構成し、遅延回路6及び差動増幅器9は第1のパ
ルス列作成手段を構成し、差動増幅器+スライサ、遅延
回路14、差動増幅器15、及び整流素子16は第2の
パルス列作成手段を構成する。Further, in this embodiment, the electronic switch 4, the constant voltage source 5, the resistor 6 and the capacitor 7 constitute PDM signal conversion means, and the delay circuit 6 and the differential amplifier 9 constitute the first pulse train generation means. The differential amplifier + slicer, the delay circuit 14, the differential amplifier 15, and the rectifying element 16 constitute a second pulse train creating means.
【0012】図3は、図2のPDM波補間回路50の各
構成部分の入出力信号波形図であり、図3(a),
(a’)にPDM波1のパルスタイミングを示す。な
お、図3(a)は欠落のないパルス列、図3(a’)は
欠落パルスのあるパルス列の例である。定電圧源5を抵
抗6を介してコンデンサ7に充電するが、コンデンサ7
は電子スイッチ3でPDM波1のパルスでONして電荷
を放電する。なお、コンデンサ7としてはPDM波1の
パルス幅で十分に放電できる容量のものを用いるように
する。FIG. 3 is an input / output signal waveform diagram of each component of the PDM wave interpolation circuit 50 of FIG.
(A ') shows the pulse timing of the PDM wave 1. It should be noted that FIG. 3A shows an example of a pulse train having no missing pulse, and FIG. 3A 'shows an example of a pulse train having a missing pulse. The constant voltage source 5 is charged into the capacitor 7 via the resistor 6, but the capacitor 7
Is turned on by the pulse of the PDM wave 1 by the electronic switch 3 to discharge the electric charge. As the capacitor 7, a capacitor having a capacity capable of sufficiently discharging the pulse width of the PDM wave 1 is used.
【0013】また、コンデンサ7の端子電圧13は図3
(b),(b’)に示すような鋸波状の波形(以下、鋸
波と記す)を示す。ここで、図3(b’)はt=t5の
パルスが欠落している場合(図1(a’)参照)であ
り、本発明はt=t5の近傍に補間パルスを挿入するこ
とを具体的目的とする。The terminal voltage 13 of the capacitor 7 is shown in FIG.
A sawtooth waveform (hereinafter referred to as a sawtooth wave) as shown in (b) and (b ') is shown. Here, FIG. 3 (b ') is a case where the pulse of t = t5 is missing (see FIG. 1 (a')), and the present invention specifically inserts an interpolation pulse in the vicinity of t = t5. Purpose.
【0014】図3(b’)に示すようにt=t5のパル
スが欠落すると鋸波の振幅が欠落区間で大きくなる。ま
た、図3(b),(b’)の鋸波の山の大きさ(振幅)
はt1〜t2,t2〜t3,t3〜t4,…のパルス間
隔に近似的に比例している。鋸波13を遅延時間τ1の
遅延回路8に加えると、図3(b’)の鋸波は図3
(c)に示すように時間τ1だけずれた信号となる。As shown in FIG. 3 (b '), when the pulse of t = t5 is missing, the amplitude of the sawtooth wave becomes large in the missing section. In addition, the size (amplitude) of the sawtooth peaks in FIGS. 3B and 3B '
Are approximately proportional to the pulse intervals of t1 to t2, t2 to t3, t3 to t4, .... When the sawtooth wave 13 is added to the delay circuit 8 having the delay time τ1, the sawtooth wave in FIG.
As shown in (c), the signals are shifted by time τ1.
【0015】次に、鋸波13(図3(b’))と遅延回
路8の出力の鋸波(図3(c))を差動増幅器9で演算
し、図3(d)に示す出力パルスを得る。図3(d)の
出力パルス列は図3(b’)の鋸波13の振幅、すなわ
ち、図3(a’)のパルス間隔に比例している。ボック
スカー10で差動増幅器9の出力のピーク値(図3
(d))を次のパルスまで保持する(すなわち、出力さ
れるパルスのピーク値を保持し、次のパルスのピーク値
を次のパルスまで保持し、次いで一次のパルスもそのピ
ーク値を保持する)。Next, the sawtooth wave 13 (FIG. 3B ') and the sawtooth wave of the output of the delay circuit 8 (FIG. 3C) are calculated by the differential amplifier 9, and the output shown in FIG. 3D is obtained. Get the pulse. The output pulse train of FIG. 3D is proportional to the amplitude of the sawtooth wave 13 of FIG. 3B ′, that is, the pulse interval of FIG. 3A ′. The peak value of the output of the differential amplifier 9 in the box car 10 (see FIG.
(D)) is held until the next pulse (that is, the peak value of the output pulse is held, the peak value of the next pulse is held until the next pulse, and then the first pulse also holds the peak value. ).
【0016】差動増幅器+スライサ11は基本的にはボ
ックスカー10の出力と鋸波13との差を作り、その正
の成分を拡大して一定値にスライスする。従って、図3
(e)で、破線で示すボックスカー10の出力と一点鎖
線で示されている鋸波13の出力の差をとり、その正の
部分をパルス化すると差動増幅器+スライサ11の出力
として図3(f)に示すようなt3’〜t3とt5’〜
t6のパルス12が得られる。なお、図3(f)でt=
t5’の位置は図3(a)のt=t5の位置の近傍位置
となる。The differential amplifier + slicer 11 basically makes a difference between the output of the box car 10 and the sawtooth wave 13, and expands the positive component to slice it into a constant value. Therefore, FIG.
In (e), the difference between the output of the boxcar 10 indicated by the broken line and the output of the sawtooth wave 13 indicated by the alternate long and short dash line is taken, and when the positive portion thereof is pulsed, the output of the differential amplifier + slicer 11 is obtained. As shown in (f), t3 'to t3 and t5' to
A pulse 12 of t6 is obtained. In addition, t = in FIG.
The position of t5 ′ is a position near the position of t = t5 in FIG.
【0017】次に、差動増幅器+スライサ11の出力パ
ルス12を△t2の微小遅延回路14に加えその出力と
出力パルス12の差を差動増幅器15でとり、更に整流
素子18で差動出力の正極成分を出力させ、図3(g)
に示すような幅τ2Nのパルスをt=t3’とt5’に
作る。ここで、補間に必要なパルスはt=t5’のパル
スでありt3’のパルスは不要である。そこで、整流素
子16の出力(図3(g)参照)を遅延回路17でτ
min/2だけ遅延させ図3(h)に示すようにし、この
パルスをゲート回路19で差動増幅器+スライサ11の
出力パルス12によりゲートし、(g)のt=t5’
((h)のt5’+τmin/2)のパルスのみを取り出
して図3(i)に示すパルスとする。Next, the output pulse 12 of the differential amplifier + slicer 11 is applied to the minute delay circuit 14 of Δt2, the difference between the output and the output pulse 12 is taken by the differential amplifier 15, and further the differential output is made by the rectifying element 18. The positive electrode component of is output as shown in FIG.
A pulse having a width τ2N as shown in (1) is created at t = t3 ′ and t5 ′. Here, the pulse required for interpolation is the pulse of t = t5 ', and the pulse of t3' is unnecessary. Therefore, the output of the rectifying element 16 (see FIG. 3 (g)) is set to τ
It is delayed by min / 2 as shown in FIG. 3 (h), and this pulse is gated by the output pulse 12 of the differential amplifier + slicer 11 in the gate circuit 19, and t = t5 ′ in (g).
Only the pulse of (t5 ′ + τ min / 2 of (h)) is taken out and used as the pulse shown in FIG. 3 (i).
【0018】一方、PDM波3を遅延回路18でτmin
/2(実際には図3(d)のパルスの処理の遅延を含
む)だけ遅延させ図3(i)に示したゲート回路19の
ゲート出力とのタイミングを合わせて加算回路20でゲ
ート出力と遅延回路18の出力を加算して補間後のPD
M信号(補間PDM信号)出力3’を得る(図3(j)
参照)。On the other hand, the PDM wave 3 is delayed by the delay circuit 18 by τ min.
/ 2 (actually including the delay of the pulse processing of FIG. 3D) is delayed to match the gate output of the gate circuit 19 shown in FIG. PD after interpolation by adding the outputs of the delay circuit 18
An M signal (interpolated PDM signal) output 3'is obtained (FIG. 3 (j)).
reference).
【0019】上述の補間PDM信号をLPF(低域フィ
ルタ)を通して復調して質のよいベースバンド信号を得
ることができる(すなわち、t=t5’はt5の近傍で
あり、近似的にt5=t5’とできるのでPDM復調で
S/Nの劣化は少なくなる)。なお、上記説明ではPD
M波の補間回路をパルスカウント型のFM受信装置の弱
電界受信の際のPDM波の欠落パルスの補間に用いる場
合について述べたが、通常のPDM波における欠落パル
スの補間にも適用できることはいうまでもない。The above-described interpolated PDM signal can be demodulated through an LPF (low pass filter) to obtain a good quality baseband signal (that is, t = t5 'is near t5, and approximately t5 = t5. ', So PDM demodulation reduces S / N degradation). In the above description, PD
The case where the M wave interpolation circuit is used to interpolate the missing pulse of the PDM wave at the time of weak electric field reception of the pulse count type FM receiver has been described, but it is also applicable to the interpolation of the missing pulse of the normal PDM wave. There is no end.
【0020】[0020]
【発明の効果】以上説明したように本発明によれば、パ
ルスカウント型のFM受信装置で弱電界受信の際生ずる
PDM波のパルス欠落をパルスの欠落位置の近傍位置に
補間できるので、パルスカウント型のFM受信装置にお
けるPDM波の復調の際のS/Nの大きな劣化を抑制す
ることができ、受信感度向上を実現することができる。
また、一般的なPDM波のパルス列に生ずる欠落パルス
についても適用できるので、復調したベースバンド信号
の質を向上させ得る。As described above, according to the present invention, a pulse count type FM receiving apparatus can interpolate a missing pulse of a PDM wave that occurs when a weak electric field is received, to a position near the missing position of the pulse. It is possible to suppress a large deterioration of S / N at the time of demodulating the PDM wave in the FM receiver of the type, and to improve the receiving sensitivity.
Further, since it can be applied to the missing pulse generated in the pulse train of the general PDM wave, the quality of the demodulated baseband signal can be improved.
【図1】本発明に基づくPDM波の復調装置の一実施例
の構成を示すブロック図である。FIG. 1 is a block diagram showing the configuration of an embodiment of a PDM wave demodulation device according to the present invention.
【図2】PDM波補間回路の一実施例である。FIG. 2 is an example of a PDM wave interpolation circuit.
【図3】図2のPDM波補間回路の各構成部分の入出力
信号波形図である。FIG. 3 is an input / output signal waveform diagram of each component of the PDM wave interpolation circuit of FIG.
【図4】従来のPDM波復調器の基本的な構成例を示す
ブロック図である。FIG. 4 is a block diagram showing a basic configuration example of a conventional PDM wave demodulator.
4 電子スイッチ(PDM信号変換手段) 5 定電圧源(PDM信号変換手段) 6 抵抗(PDM信号変換手段) 7 コンデンサ(PDM信号変換手段) 8 遅延回路(第1のパルス列作成手段) 9 差動増幅器(第1のパルス列作成手段) 10 ボックスカー回路(ピーク値保持手段) 11 差動増幅器+スライサ(第2のパルス列作成手
段) 14 遅延回路(第2のパルス列作成手段) 15 差動増幅器(第2のパルス列作成手段) 16 整流素子(第2のパルス列作成手段) 19 ゲート回路(補間パルス抽出手段) 20 加算回路(合成手段)4 Electronic Switch (PDM Signal Converting Means) 5 Constant Voltage Source (PDM Signal Converting Means) 6 Resistor (PDM Signal Converting Means) 7 Capacitor (PDM Signal Converting Means) 8 Delay Circuit (First Pulse Train Creating Means) 9 Differential Amplifier (First pulse train creating means) 10 Boxcar circuit (peak value holding means) 11 Differential amplifier + slicer (second pulse train creating means) 14 Delay circuit (second pulse train creating means) 15 Differential amplifier (second) Pulse train creating means) 16 rectifying element (second pulse train creating means) 19 gate circuit (interpolation pulse extracting means) 20 adding circuit (synthesizing means)
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 H04L 27/156 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location H04L 27/156
Claims (2)
した振幅の信号に変換するPDM信号変換手段と、 前記PDM信号変換手段の出力からパルス列を作成する
第1のパルス列作成手段と、 前記第1のパルス列作成手段から出力されるパルスのピ
ーク値を保持して次のパルスのタイミングで該ピーク値
を出力するピーク値保持手段と、 前記出力されたピーク値と前記PDM信号変換手段との
差信号から正極成分のパルス列を得る第2のパルス列作
成手段と、 前記正極成分のパルス列を前記第1のパルス列作成手段
からの出力パルスで制御して補間パルスを抽出する補間
パルス抽出手段と、 前記補間パルスと前記PDM信号を合成して補間PDM
信号を得る信号合成手段と、 を有することを特徴とするFM受信装置。1. A PDM signal converting means for converting a PDM signal into a signal having an amplitude proportional to the size of a pulse interval; a first pulse train creating means for creating a pulse train from the output of the PDM signal converting means; The peak value holding means for holding the peak value of the pulse output from the first pulse train creating means and outputting the peak value at the timing of the next pulse; and the difference between the output peak value and the PDM signal converting means. Second pulse train creating means for obtaining a pulse train of a positive component from a signal; interpolation pulse extracting means for controlling the pulse train of the positive component by an output pulse from the first pulse train creating means to extract an interpolation pulse; Interpolation PDM by synthesizing pulse and the PDM signal
An FM receiving apparatus comprising: a signal synthesizing unit that obtains a signal.
いて、FM波をパルス列に変換する信号変換手段と請求
項1記載のFM受信装置。2. The FM receiving apparatus according to claim 1, wherein in the pulse counting type FM receiving apparatus, a signal converting means for converting an FM wave into a pulse train.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP33889293A JP3367728B2 (en) | 1993-12-02 | 1993-12-02 | FM receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33889293A JP3367728B2 (en) | 1993-12-02 | 1993-12-02 | FM receiver |
Publications (2)
Publication Number | Publication Date |
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JPH07162325A true JPH07162325A (en) | 1995-06-23 |
JP3367728B2 JP3367728B2 (en) | 2003-01-20 |
Family
ID=18322344
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP33889293A Expired - Fee Related JP3367728B2 (en) | 1993-12-02 | 1993-12-02 | FM receiver |
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JP (1) | JP3367728B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20000038210A (en) * | 1998-12-04 | 2000-07-05 | 윤종용 | Non-control frequency demodulator |
-
1993
- 1993-12-02 JP JP33889293A patent/JP3367728B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20000038210A (en) * | 1998-12-04 | 2000-07-05 | 윤종용 | Non-control frequency demodulator |
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JP3367728B2 (en) | 2003-01-20 |
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