JPH05260105A - Radio transmission equipment - Google Patents
Radio transmission equipmentInfo
- Publication number
- JPH05260105A JPH05260105A JP4051991A JP5199192A JPH05260105A JP H05260105 A JPH05260105 A JP H05260105A JP 4051991 A JP4051991 A JP 4051991A JP 5199192 A JP5199192 A JP 5199192A JP H05260105 A JPH05260105 A JP H05260105A
- Authority
- JP
- Japan
- Prior art keywords
- output
- envelope
- power amplifier
- radio frequency
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Transmitters (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、入力データを位相シフ
ト（ＰＳＫ符号変調）した無線周波信号に変換し、所定
レベルまで電力増幅した出力を送信するディジタル伝送
方式の無線送信装置に係り、特に入力データ1/0に対応
するＰＳＫ変調器の出力の無線周波数の搬送波の振幅に
変化を与えて、帯域外スペクトラムが抑圧された送信波
を出力する無線送信装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital transmission type wireless transmission apparatus for converting input data into a phase-shifted (PSK code-modulated) radio frequency signal and transmitting the power-amplified output. The present invention relates to a radio transmission device that outputs a transmission wave in which an out-of-band spectrum is suppressed by changing the amplitude of a radio frequency carrier output from a PSK modulator corresponding to input data 1/0.
【０００２】[0002]
【従来の技術】ディジタル方式の無線送信装置は、入力
データ1/0を例えば位相 0／πだけシフトする所謂ＰＳ
Ｋ符号化した無線周波信号に変換して出力するＰＳＫ変
調方式が主として用いられているが、その入力データ1/
0に対応する無線周波信号の位相偏移 0／πの転換点で
は、変調器出力の振幅分布に大きな変化が起って無線信
号出力に側帯波スペクトラムの拡散が起こり、其れを増
幅する電力増幅器の出力から、予め定められた帯域外の
妨害波が発射されてしまうと言う問題がある。この対策
として、従来は図５の４相ＰＳＫ変調の場合の構成図に
示す如く、平衡変調器201,202の出力のスペクトラム拡
散を抑止する為に、その前段に低域ろ波器LPF を設けて
信号パルスの波形を整形する場合は、電力増幅器30で直
線増幅するが、波形整形の低域ろ波器LPFが無くて電力
増幅器30が非線型増幅する場合は、点線の如く、非線型
の電力増幅器30の入力と出力の無線信号を検波器50で検
波して得た包絡線を比較制御器60にて比較して其の比較
出力の制御信号で該電力増幅器30の動作点を変えて、送
信出力波の帯域外スペクトラムを抑圧する方法が採られ
ていた。この他に、図示はしないが、位相の転換点付近
の位相変化を徐々に行い無線周波信号の振幅は変化させ
ず、その後、位相と振幅の両方を徐々に変化させる等の
方法がある。これらの帯域外スペクトラムを抑圧するた
めの技術は、位相の転換点付近の無線周波信号の振幅を
徐々に下げて行き、位相の転換点では振幅を零とする。
そして位相の転換が終了したら、徐々に振幅を上げて行
く方式である。この方式では、出力のＰＳＫ変調された
無線搬送波信号を検波して得る包絡線は変調度 100％の
振幅変調波となる。この技術は換言すれば、ＰＳＫ変調
器における入力データ1/0 に対応してＰＳＫ変調された
無線搬送波信号の振幅に変化を与えることにより、帯域
外スペクトラムを抑圧させているものと言える。2. Description of the Related Art A digital radio transmitter is a so-called PS that shifts input data 1/0 by, for example, phase 0 / π.
The PSK modulation method, which converts and outputs a K-coded radio frequency signal, is mainly used.
At the turning point of the phase shift 0 / π of the radio frequency signal corresponding to 0, a large change occurs in the amplitude distribution of the modulator output, the spread of the sideband spectrum occurs in the radio signal output, and the power to amplify it There is a problem that an interference wave out of a predetermined band is emitted from the output of the amplifier. As a countermeasure against this, conventionally, as shown in the configuration diagram of the four-phase PSK modulation of FIG. 5, in order to suppress the spread spectrum of the outputs of the balanced modulators 20 1 and 20 2 , a low-pass filter LPF is provided in the preceding stage. When the waveform of the signal pulse is shaped by providing the signal, linear amplification is performed by the power amplifier 30, but when the power amplifier 30 is non-linearly amplified without the low-pass filter LPF for waveform shaping, as indicated by the dotted line, The comparison controller 60 compares the envelopes obtained by detecting the input and output radio signals of the linear power amplifier 30 with the detector 50 and compares the operating point of the power amplifier 30 with the control signal of the comparison output. Instead, a method of suppressing the out-of-band spectrum of the transmission output wave has been adopted. Other than this, although not shown, there is a method in which the phase is gradually changed in the vicinity of the phase change point, the amplitude of the radio frequency signal is not changed, and then both the phase and the amplitude are gradually changed. A technique for suppressing these out-of-band spectrums is to gradually reduce the amplitude of the radio frequency signal in the vicinity of the phase turning point, and make the amplitude zero at the phase turning point.
Then, when the phase conversion is completed, the amplitude is gradually increased. In this system, the envelope obtained by detecting the output PSK-modulated wireless carrier signal is an amplitude-modulated wave with a modulation degree of 100%. In other words, it can be said that this technique suppresses the out-of-band spectrum by changing the amplitude of the PSK-modulated wireless carrier signal corresponding to the input data 1/0 in the PSK modulator.
【０００３】[0003]
【発明が解決しようとする課題】送信出力波の帯域外ス
ペクトラムを抑圧した従来のディジタル無線送信装置
は、図５の構成で、電力増幅器30が非線型増幅する場合
は、ＰＳＫ変調器の出力の振幅が変化し位相がシフトし
た無線周波数のQPSK信号を非線型増幅する電力増幅器30
の入力と出力の無線信号の検波出力の包絡線を比較し、
其の比較出力で該電力増幅器の動作点を変えて対応する
が、図５で電力増幅器30が直線増幅する場合は、入力デ
ータ1/0 で振幅分布が変化する無線周波信号の増幅出力
の振幅歪（奇数次の混変調歪）を少なくするため、入力
の無線信号レベルの広い範囲で入力と出力の振幅の直線
性が良いことが必要である。そのため、所謂Ａ級増幅の
線型増幅器であって且つ出力電力に余裕のある大容量の
電力増幅器でなければならず、従って、其の電力増幅器
30の電力能率は著しく低くなり、送信装置としての消費
電力が大きく放熱も困難になる等という問題があった。
本発明の目的は、ＰＳＫ変調された無線周波信号を増幅
する電力増幅器の電力能率が高くて且つＰＳＫ変調器の
歪を含めた綜合的な伝送歪を改善して、帯域外スペクト
ラムが抑圧された信号出力を送信するディジタル方式の
無線送信装置を実現することにある。The conventional digital radio transmitter that suppresses the out-of-band spectrum of the transmission output wave has the configuration shown in FIG. 5, and when the power amplifier 30 performs non-linear amplification, the output of the PSK modulator is changed. Power amplifier 30 for non-linear amplification of radio frequency QPSK signals whose amplitude is changed and whose phase is shifted
Comparing the envelope of the detection output of the input and output radio signals,
The comparison output corresponds by changing the operating point of the power amplifier. When the power amplifier 30 linearly amplifies in FIG. 5, the amplitude of the amplified output of the radio frequency signal whose amplitude distribution changes with the input data 1/0. In order to reduce distortion (odd order intermodulation distortion), it is necessary that the linearity of the amplitude of the input and output is good in a wide range of the radio signal level of the input. Therefore, it must be a so-called class A amplification linear amplifier and a large-capacity power amplifier with a sufficient output power.
The power efficiency of 30 is remarkably low, and there is a problem that the power consumption of the transmitting device is large and heat dissipation is difficult.
It is an object of the present invention that the power efficiency of a power amplifier that amplifies a PSK-modulated radio frequency signal is high and that the comprehensive transmission distortion including the distortion of the PSK modulator is improved and the out-of-band spectrum is suppressed. It is to realize a digital type wireless transmission device that transmits a signal output.
【０００４】[0004]
【課題を解決するための手段】この目的達成のための本
発明の基本構成は、図１の原理図に示す如く、入力デー
タの単極パルスUを両極パルスBに変換する単極／両極パ
ルス変換器10と、其の出力の両極パルスBにより局部発
振器40の出力の無線周波数の搬送波を平衡変調し位相シ
フトした無線周波数のＰＳＫ信号（図１では２相ＰＳＫ
であるＢＰＳＫ信号）を出力する平衡変調器20と、その
出力の無線周波数のＰＳＫ信号を増幅し所定レベルの送
信出力とする電力増幅器30と、其の送信出力を検波し其
の無線周波信号の包絡線を得る包絡線検波器50と、其の
出力の包絡線を所定の包絡線と比較し其の比較出力によ
り前記電力増幅器の利得を制御する比較制御器60からな
るディジタル方式の無線送信装置において、該無線送信
装置から最終的に正しく出力されるべき無線周波信号の
包絡線を別途入力クロックに合せて入力データから生成
する包絡線生成器１を具え、其の別途生成した包絡線と
前記電力増幅器30の出力を検波して得た包絡線とを前記
比較制御器60にて比較し、其の比較出力により、前記電
力増幅器30の利得を制御して、其の電力増幅器の出力の
送信出力の包絡線が前記の別途生成した包絡線に一致す
るように制御する構成とする。The basic structure of the present invention for achieving this object is, as shown in the principle diagram of FIG. 1, a unipolar / bipolar pulse for converting a unipolar pulse U of input data into a bipolar pulse B. A radio frequency PSK signal obtained by balance-modulating a phase-shifted radio frequency carrier output from the local oscillator 40 by the converter 10 and its output bipolar pulse B (two-phase PSK in FIG. 1).
BPSK signal), a power amplifier 30 that amplifies the output radio frequency PSK signal into a transmission output of a predetermined level, and detects the transmission output to detect the radio frequency signal. A digital radio transmission device comprising an envelope detector 50 for obtaining an envelope, a comparison controller 60 for comparing the envelope of its output with a predetermined envelope and controlling the gain of the power amplifier by the comparison output. In the above, the radio transmitter further comprises an envelope generator 1 for separately generating an envelope of a radio frequency signal to be correctly output from an input data in accordance with an input clock, and the separately generated envelope and the envelope The envelope obtained by detecting the output of the power amplifier 30 is compared by the comparison controller 60, and the gain of the power amplifier 30 is controlled by the comparison output, and the output of the power amplifier is transmitted. Output envelope is front A configuration in which control of such separately to match the generated envelope.
【０００５】[0005]
【作用】図１の構成の本発明の動作は、図２の各部のデ
ータと波形の関係を示す図により説明される。図２の
データは、入力の単極パルスUを示し、単／両変換器10
にて両極パルスBに変換され、単／両コンバータに示
す如く、両極パルスBを出力して平衡変調器20へ入力さ
れる。また、平衡変調器20には、局発に示す如き、無
線周波数の搬送波が入力されて其の搬送波を前記入力の
両極パルスBにより平衡変調し、平衡変調器の出力に
示す如き、位相が所定値だけシフトした無線周波数のＰ
ＳＫ信号を出力する。そして此の出力の無線周波数のＰ
ＳＫ信号は、電力増幅器30にて所定の出力レベルまで電
力増幅され送信出力として出力されるが、その送信出力
は包絡線検波器50にて検波され其の包絡線を出力する。
一方、本発明の包絡線生成器１は、生成包絡線に示す
如き、無線送信装置から最終的に正しく出力されるべき
ＰＳＫ変調された無線信号出力波の包絡線を別途入力ク
ロックに合せて入力データから生成し、前記の包絡線検
波器50の出力の其の時の送信出力の包絡線と、比較制御
器60にて比較し、其の比較出力により、前記電力増幅器
30の利得を制御する。すると、電力増幅器30の出力は、
出力に示す如き、正しい無歪のＰＳＫ変調された無線
周波信号となる。そして此の本発明の構成によれば、そ
の歪みは補正されるので、電力増幅器30は、其の入力信
号と出力信号の振幅の直線性の必要が無いので、電力能
率が高い非線型増幅の所謂Ｃ級動作の電力増幅器を用い
る事が可能となり、送信装置としての電力効率を著しく
改善する事が出来る。また、本発明の構成によれば、包
絡線生成器１が、電力増幅器30のみならず平衡変調器20
で発生する歪みも含めて送信装置から正しく出力される
べき送信出力波の無線周波信号の包絡線を別途入力デー
タから生成し、比較制御器60にて、送信出力の包絡線と
比較して制御信号を生成し、前記歪の補正に利用される
ので、平衡変調器20と電力増幅器30とで発生する信号歪
の全てを補正改善する事が出来る。The operation of the present invention having the configuration of FIG. 1 will be described with reference to the diagram of FIG. The data in FIG. 2 shows the unipolar pulse U at the input,
Is converted into a bipolar pulse B at, and the bipolar pulse B is output and input to the balanced modulator 20 as shown in the single / double converter. Further, as shown in the local oscillator, a carrier of radio frequency is input to the balanced modulator 20, the carrier is balanced-modulated by the bipolar pulse B of the input, and the phase is predetermined as shown in the output of the balanced modulator. Radio frequency P shifted by a value
Output the SK signal. And the radio frequency P of this output
The SK signal is power-amplified by the power amplifier 30 to a predetermined output level and output as a transmission output. The transmission output is detected by the envelope detector 50 and the envelope is output.
On the other hand, the envelope generator 1 of the present invention inputs the envelope of the PSK-modulated radio signal output wave that should be finally output correctly from the radio transmitter as shown in the generation envelope, separately according to the input clock. Generated from the data, the envelope of the output of the envelope detector 50 at that time and the envelope of the transmission output at that time are compared by the comparison controller 60, and by the comparison output, the power amplifier
Control a gain of 30. Then, the output of the power amplifier 30 is
As shown in the output, a correct distortion-free PSK-modulated radio frequency signal is obtained. Further, according to the configuration of the present invention, since the distortion is corrected, the power amplifier 30 does not need the linearity of the amplitude of the input signal and the output signal thereof, and thus the power amplifier 30 is a nonlinear amplification with high power efficiency. It is possible to use a so-called class C power amplifier, and it is possible to remarkably improve the power efficiency of the transmitter. Further, according to the configuration of the present invention, the envelope generator 1 includes not only the power amplifier 30 but also the balanced modulator 20.
In addition, the envelope of the radio frequency signal of the transmission output wave that should be correctly output from the transmission device including the distortion generated by is generated from the input data separately, and the comparison controller 60 compares it with the envelope of the transmission output and controls it. Since the signal is generated and used for the correction of the distortion, it is possible to correct and improve all the signal distortion generated in the balanced modulator 20 and the power amplifier 30.
【０００６】[0006]
【実施例】図３は本発明の実施例で４相ＰＳＫ変調の場
合の無線送信装置の構成例を示す。本実施例では、単極
／両極パルス変換器101,102と平衡変調器201,202の２系
統分を備え、その前段に、入力データ(0,1)の１系列の
単極パルスを、後段の４相ＰＳＫ変調に適する様に２系
列の単極パルスのデータ(00,11;01,10) に組み替えて出
力するマッピング回路80と、前記２系統の平衡変調器20
1,202 の一方202に対する、局部発振器40の出力の無線
周波数の搬送波の位相をπ/2だけ偏移させるπ/2移相器
70とを付加し、４相位相シフト変調のＱＰＳＫ変調器を
構成している。また、入力データから別途正しい送信出
力波の包絡線を生成する包絡線生成器１を備える本発明
の構成によれば、発生する歪は全て補正されるので、Ｐ
ＳＫ変調器として図６に示す如き従来の平衡変調器を使
用せず、図４に示す如く、無線周波数の搬送波信号を、
単極／両極パルス変換器(10)の出力によりオン／オフす
る単純な非直線素子のスイッチ(SW)２を使用する事によ
り、所要のＢＰＳＫ変調器とＱＰＳＫ変調器とを簡単に
構成することが出来る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows an example of the configuration of a wireless transmission device in the case of 4-phase PSK modulation according to an embodiment of the present invention. In this embodiment, two systems of a unipolar / bipolar pulse converter 10 1, 10 2 and a balanced modulator 20 1, 20 2 are provided, and one series of unipolar of input data (0, 1) is provided in the preceding stage. A mapping circuit 80 for rearranging the pulses into data of two series of unipolar pulses (00,11; 01,10) so as to be suitable for the four-phase PSK modulation at the subsequent stage and outputting the data, and the balanced modulator of the two systems 20
1, 20 for one 20 second 2, the phase of the carrier of the radio frequency output of the local oscillator 40 [pi / 2 only by shift [pi / 2 phase shifter
70 is added to form a QPSK modulator for four-phase phase shift modulation. Further, according to the configuration of the present invention including the envelope generator 1 that separately generates the correct envelope curve of the transmission output wave from the input data, all the generated distortions are corrected.
Instead of using the conventional balanced modulator as shown in FIG. 6 as the SK modulator, as shown in FIG.
Simple configuration of required BPSK modulator and QPSK modulator by using switch (SW) 2 which is a simple non-linear element that is turned on / off by the output of unipolar / bipolar pulse converter (10). Can be done.
【０００７】[0007]
【発明の効果】以上説明した如く、本発明によれば、Ｐ
ＳＫ変調された無線周波信号を増幅する電力増幅器が高
能率のＣ級増幅器であって消費電力が少なく且つ簡単な
構成で信号歪の低いＰＳＫ変調された送信波を出力する
ディジタル無線送信装置が実現できるので、これを携帯
型の無線機に適用すれば、該携帯無線機の重量の大部分
を占める電源の電池を小形化し軽量化する効果が得られ
る。As described above, according to the present invention, P
A power amplifier for amplifying a SK-modulated radio frequency signal is a high-efficiency class C amplifier, which realizes a digital radio transmitter which outputs a PSK-modulated transmission wave with low signal distortion and low power consumption and a simple configuration. Therefore, if this is applied to a portable wireless device, the effect of reducing the size and weight of the battery of the power source, which occupies most of the weight of the portable wireless device, can be obtained.
【図１】 本発明の無線送信装置の基本構成を示す原理
図FIG. 1 is a principle diagram showing a basic configuration of a wireless transmission device of the present invention.
【図２】 本発明の無線送信装置の動作を説明するため
の各部のデータと其の波形の関係を示す図FIG. 2 is a diagram showing the relationship between the data of each unit and its waveform for explaining the operation of the wireless transmission device of the present invention.
【図３】 本発明の請求項２の実施例の４相ＰＳＫ変調
の無線送信装置の構成図FIG. 3 is a configuration diagram of a 4-phase PSK modulation wireless transmission device according to an embodiment of claim 2 of the present invention.
【図４】 本発明の請求項３の実施例の２相ＰＳＫ変調
器と４相ＰＳＫ変調器の回路図FIG. 4 is a circuit diagram of a two-phase PSK modulator and a four-phase PSK modulator according to a third embodiment of the present invention.
【図５】 従来の４相ＰＳＫ変調の無線送信装置の構成
図FIG. 5 is a configuration diagram of a conventional 4-phase PSK modulation wireless transmission device.
【図６】 従来のＰＳＫ変調器の平衡変調器の回路図FIG. 6 is a circuit diagram of a balanced modulator of a conventional PSK modulator.
１は包絡線生成器、２はスイッチSW、10は単極- 両極パ
ルス変換器、20は平衡変調器、30は電力増幅器、40は局
部発振器、50は包絡線検波器、60は比較制御器、70はπ
/2移相器、80はマッピング回路である。1 is an envelope generator, 2 is a switch SW, 10 is a unipolar-bipolar pulse converter, 20 is a balanced modulator, 30 is a power amplifier, 40 is a local oscillator, 50 is an envelope detector, and 60 is a comparison controller. , 70 is π
A / 2 phase shifter, 80 is a mapping circuit.
Claims (3)
ス(B)に変換する単極／両極パルス変換器(10)と、其の
出力の両極パルス(B)により局部発振器(40)の出力の無
線周波数の搬送波を平衡変調して位相シフトした無線周
波数のＰＳＫ信号を出力する平衡変調器(20)と、その出
力の無線周波数のＰＳＫ信号を所定レベルまで増幅する
電力増幅器(30)と、其の出力の送信出力を検波して其の
無線周波数信号の包絡線を得る包絡線検波器(50)と、其
の出力の包絡線を所定の包絡線と比較し其の比較出力に
より前記電力増幅器の利得を制御する比較制御器(60)か
らなり該電力増幅器(30)の出力を送信出力とするディジ
タル方式の無線送信装置において、該無線送信装置から
最終的に正しく出力されるべき無線周波信号の包絡線を
別途入力クロックに合わせて入力データから生成する包
絡線生成器(1) を具え、其の別途生成した包絡線と前記
電力増幅器(30)の出力を検波した包絡線とを前記比較制
御器(60)にて比較し、其の比較出力により前記電力増幅
器の利得を制御して、該電力増幅器の出力の包絡線が前
記の別途生成した包絡線に一致するように制御すること
を特徴とした無線送信装置。1. A local oscillator (40) comprising a monopolar / bipolar pulse converter (10) for converting a monopolar pulse (U) of input data into a bipolar pulse (B) and a bipolar pulse (B) of its output. (20) that outputs a PSK signal of a radio frequency that is phase-shifted by phase-modulating the carrier of the radio frequency of the output of the above, and a power amplifier (30) that amplifies the PSK signal of the radio frequency of the output to a predetermined level And an envelope detector (50) that detects the transmission output of the output and obtains the envelope of the radio frequency signal, and compares the envelope of the output with a predetermined envelope and In a digital type wireless transmission device that comprises a comparison controller (60) for controlling the gain of the power amplifier and uses the output of the power amplifier (30) as a transmission output, it should be finally output correctly from the wireless transmission device. The input curve of the radio frequency signal should be adjusted according to the input clock. And an envelope generator (1) generated from the power amplifier (1), the separately generated envelope and the envelope detected from the output of the power amplifier (30) are compared by the comparison controller (60). The wireless transmission device is characterized in that the gain of the power amplifier is controlled by the comparison output of (1) to match the envelope of the output of the power amplifier with the separately generated envelope.
パルス変換器(101,102)と平衡変調器(201,202)の２系統
分と、その前段で入力データ(0,1)の１系列の単極パル
スを後段でＰＳＫ変調するのに適した２系列の単極パル
スのデータ[(0,0)(1,1);(0,1)(1,0)]に組み替えて出力
するマッピング回路(80)と、前記２系統の平衡変調器(2
01,202)の何れか一方(202)の為の局部発振器(40)の出力
の搬送波の位相をπ/2だけ偏移させるπ/2移相器(70)を
具えて、入力データを４相位相シフト変調することを特
徴とする請求項１記載の無線送信装置。2. In the wireless transmission device, two systems of a monopolar / bipolar pulse converter (10 1, 10 2 ) and a balanced modulator (20 1, 20 2 ) are provided, and input data (0, Data of 2 series of unipolar pulse suitable for PSK modulation of 1 series of unipolar pulse in 1) [(0,0) (1,1); (0,1) (1,0)] And a mapping circuit (80) for rearranging and outputting to the two systems of the balanced modulator (2
0 1, 20 2 ), the local oscillator (40) output for either (20 2 ) is shifted by π / 2 to shift the phase of the carrier by a π / 2 phase shifter (70). The radio transmitting apparatus according to claim 1, wherein the data is quadrature phase shift modulated.
変調器(20)が、局部発振器(40)の出力の無線周波数の搬
送波を、単極／両極パルス変換器(10)の出力によりオン
／オフするスイッチ(2)に代替されたことを特徴とする
請求項１記載の無線送信装置。3. The balanced modulator (20) of the PSK modulator of the radio transmitter turns on the radio frequency carrier of the output of the local oscillator (40) by the output of the unipolar / bipolar pulse converter (10). The wireless transmission device according to claim 1, wherein the wireless transmission device is replaced by a switch (2) for turning on / off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4051991A JPH05260105A (en) | 1992-03-11 | 1992-03-11 | Radio transmission equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4051991A JPH05260105A (en) | 1992-03-11 | 1992-03-11 | Radio transmission equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05260105A true JPH05260105A (en) | 1993-10-08 |
Family
ID=12902326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4051991A Withdrawn JPH05260105A (en) | 1992-03-11 | 1992-03-11 | Radio transmission equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05260105A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08102768A (en) * | 1994-09-30 | 1996-04-16 | Nec Corp | Transmitter |
| CN111312278A (en) * | 2014-03-03 | 2020-06-19 | 三星电子株式会社 | Method and apparatus for high frequency decoding for bandwidth extension |
-
1992
- 1992-03-11 JP JP4051991A patent/JPH05260105A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08102768A (en) * | 1994-09-30 | 1996-04-16 | Nec Corp | Transmitter |
| CN111312278A (en) * | 2014-03-03 | 2020-06-19 | 三星电子株式会社 | Method and apparatus for high frequency decoding for bandwidth extension |
| CN111312278B (en) * | 2014-03-03 | 2023-08-15 | 三星电子株式会社 | Method and apparatus for high frequency decoding of bandwidth extension |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990518 |