JP2587849Y2 - Amplitude modulation transmitter - Google Patents
Amplitude modulation transmitterInfo
- Publication number
- JP2587849Y2 JP2587849Y2 JP1990104609U JP10460990U JP2587849Y2 JP 2587849 Y2 JP2587849 Y2 JP 2587849Y2 JP 1990104609 U JP1990104609 U JP 1990104609U JP 10460990 U JP10460990 U JP 10460990U JP 2587849 Y2 JP2587849 Y2 JP 2587849Y2
- Authority
- JP
- Japan
- Prior art keywords
- frequency amplifiers
- power supply
- signal
- amplitude
- amplitude modulation
- 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.)
- Expired - Lifetime
Links
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は増幅変調送信機に関し、特にアナログ音声信
号を複数ビットの信号に変換し、この複数ビットの信号
に対応して配置された複数の高周波増幅器をこの複数ビ
ットの信号に応じてオンオフ制御して振幅変調搬送波を
生成する振幅変調送信機に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to an amplification modulation transmitter, and in particular, converts an analog audio signal into a multi-bit signal, and converts a plurality of bits arranged corresponding to the multi-bit signal. The present invention relates to an amplitude modulation transmitter that generates an amplitude modulated carrier by controlling on / off of a high frequency amplifier according to a signal of a plurality of bits.
従来のこの種の振幅変調送信機は第２図に示すよう
に、複数の高周波増幅器１〜10と、出力合成用のインダ
クタ11〜20と、出力合成用のキャパシタ21と、搬送波信
号を各高周波増幅器１〜10に供給する発振器22と、入力
されたアナログ音声信号を多ビットのディジタル音声信
号に変換するＡ−Ｄ変換器23と、ディジタル音声信号に
応じて高周波増幅器１〜10の動作をON/OFFするデコーダ
24と、電源回路27とを備えている。As shown in FIG. 2, a conventional amplitude modulation transmitter of this type includes a plurality of high frequency amplifiers 1 to 10, inductors 11 to 20 for output synthesis, a capacitor 21 for output synthesis, and a carrier signal for each high frequency. An oscillator 22 for supplying the amplifiers 1 to 10, an A / D converter 23 for converting an input analog audio signal into a multi-bit digital audio signal, and turning on the high-frequency amplifiers 1 to 10 according to the digital audio signal. / OFF decoder
24 and a power supply circuit 27.
高周波増幅器１〜10は、ディジタル音声信号が示す
値、すなわち入力されたアナログ音声信号の振幅に応じ
て動作する数が制御される。この高周波増幅器の出力を
合成することにより、ほぼ入力音声信号に応じて階段状
に変化する振幅変調搬送信号が得られる。The number of high-frequency amplifiers 1 to 10 that operate according to the value indicated by the digital audio signal, that is, the amplitude of the input analog audio signal, is controlled. By combining the outputs of the high-frequency amplifier, an amplitude-modulated carrier signal that changes stepwise substantially in accordance with the input audio signal is obtained.
この従来の振幅変調送信機では、複数の高周波増幅器
を使用して構成されので、万一、高周波増幅器が故障し
ても量子化雑音が若干増加するのみで運転を継続でき
る。しかし、電源回路が一系統しかないために、この電
源回路が故障すると全ての高周波増幅器が動作を停止す
る。このような事態を防ぐために、２系統の電源回路を
設けて一方の電源回路が故障したときに他方の電源回路
に切り替える方法もあるが、切替器および切替制御回路
等が必要となりコスト高になる。Since this conventional amplitude modulation transmitter is configured using a plurality of high frequency amplifiers, even if the high frequency amplifier fails, operation can be continued with only a slight increase in quantization noise. However, since there is only one power supply circuit, when this power supply circuit fails, all the high-frequency amplifiers stop operating. In order to prevent such a situation, there is a method of providing two power supply circuits and switching to the other power supply circuit when one of the power supply circuits fails. .
本考案の目的は、電源回路が故障したときに電源を切
替えることなく放送を継続できる振幅変調送信機を提供
することにある。An object of the present invention is to provide an amplitude modulation transmitter that can continue broadcasting without switching power supply when a power supply circuit fails.
本考案の振幅変調送信機は、アナログ音声信号を複数
ビットの信号に変換し、この複数ビットの信号に対応し
て配置された複数の高周波増幅器をこの複数ビットの信
号に応じてオンオフ制御することにより振幅変調搬送波
を生成する振幅変調送信機において、２つの電源回路を
備え、前記複数の高周波増幅器の隣接する増幅器が互い
に異なる前記電源回路から電源をそれぞれ供給されるよ
うに構成されている。The amplitude modulation transmitter of the present invention converts an analog voice signal into a signal of a plurality of bits, and controls on / off of a plurality of high-frequency amplifiers arranged corresponding to the signal of the plurality of bits according to the signal of the plurality of bits. In the amplitude modulation transmitter for generating an amplitude modulated carrier wave, two power supply circuits are provided, and adjacent amplifiers of the plurality of high-frequency amplifiers are configured to be respectively supplied with power from the different power supply circuits.
次に本考案について図面を参照して説明する。第１図
は本考案の一実施例を示すブロック図であり、第２図に
示した従来の振幅変調送信機と同一部分には同一番号を
付してある。第２図と異なるところは２つの電源回路2
5,26を備えていることである。複数の高周波増幅器１〜
10は発振器22から搬送波信号が供給されてこれを増幅す
るが、一方、デコーダ24の出力信号により高ON/OFF制御
される。ところで、入力されるアナログ音声信号はＡ−
Ｄ変換器23でディジタル音声信号に変換されてデコーダ
24に供給される。このデコーダ24ではアナログ音声信号
の振幅に応じて高周波増幅器の動作をON/OFFするための
複数ビットの信号を生成し出力している。Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention, and the same parts as those of the conventional amplitude modulation transmitter shown in FIG. 2 are denoted by the same reference numerals. 2 is different from Fig. 2
5,26. Multiple high-frequency amplifiers 1
10 is supplied with a carrier signal from the oscillator 22 and amplifies it. On the other hand, a high ON / OFF control is performed by an output signal of the decoder 24. By the way, the input analog audio signal is A-
The digital audio signal is converted by the D converter 23 and
Supplied to 24. The decoder 24 generates and outputs a multi-bit signal for turning on / off the operation of the high-frequency amplifier according to the amplitude of the analog audio signal.
この場合、100％変調時の正側ピークレベルでは全て
の高周波増幅器１〜10を動作させ、100％変調時の負側
ピークのレベルでは全ての高周波増幅器１〜10を停止さ
せる。また、無変調状態の搬送波レベルでは、100％変
調時の正側ピークレベルの1/2の振幅、すなわち、送信
電力では1/4になるように、高周波増幅器１〜10の内下
段からほぼ1/4までの高周波増幅器６〜10を動作させ
る。このように制御された各高周波増幅器１〜10の出力
は、インダクタ11〜20およびキャパシタ21からなる出力
合成回路で電圧加算され、アナログ音声信号に応じて階
段状に変化する振幅変調搬送波出力となる。なお、高周
波増幅器の数を多くすることによって階段波による量子
化雑音を実用上問題ない値まで低減できる。In this case, all the high frequency amplifiers 1 to 10 are operated at the positive peak level at the time of 100% modulation, and all the high frequency amplifiers 1 to 10 are stopped at the negative peak level at the time of 100% modulation. In addition, at the carrier level in the unmodulated state, the amplitude is approximately one-half of the positive peak level at the time of 100% modulation, that is, approximately 1/4 from the lower stage of the high-frequency amplifiers 1 to 10 so that the transmission power is 1/4. The high frequency amplifiers 6 to 10 up to / 4 are operated. The output of each of the high-frequency amplifiers 1 to 10 controlled in this manner is subjected to voltage addition by an output combining circuit including inductors 11 to 20 and a capacitor 21, and becomes an amplitude-modulated carrier wave output that changes stepwise according to the analog audio signal. . By increasing the number of high-frequency amplifiers, quantization noise due to staircase waves can be reduced to a value that causes no practical problem.
ここで、高周波増幅器1,3,…,9は電源回路25から電源
を供給され、また、高周波増幅器2,4,…,10は電源回路2
6から電源を供給されている。仮に、電源回路26が故障
した場合は、高周波増幅器2,4,…,10は動作を停止する
が、高周波増幅器1,3,…,9は動作する。このように、隣
接する高周波増幅器が互いに異なる電源回路から電源を
供給されているので、万一、一方の電源回路が故障して
も１つおきに動作し、出力振幅は定常時の1/2、つまり
出力電力は1/4となり、階段数が半分になるために量子
化雑音は増加するが放送をそのまま継続できる。The high-frequency amplifiers 1, 3,..., 9 are supplied with power from the power supply circuit 25, and the high-frequency amplifiers 2, 4,.
Powered by 6. If the power supply circuit 26 fails, the high-frequency amplifiers 2, 4,..., 10 stop operating, but the high-frequency amplifiers 1, 3,. As described above, since the adjacent high-frequency amplifiers are supplied with power from different power supply circuits, even if one of the power supply circuits fails, every other power supply circuit operates, and the output amplitude becomes 1/2 of the steady state. That is, the output power is reduced to 1/4, and the number of steps is reduced by half, so that the quantization noise increases but the broadcast can be continued.
以上説明したように本考案は、２つの電源回路を用
い、複数の高周波増幅器の隣接する増幅器が互いに異な
る電源回路から電源を供給されるように接続することに
より、電源回路の１つが故障しても量子化雑音が若干増
加し出力電力が低下するのみで、そのまま放送を継続で
き冗長性が向上するという効果を有する。As described above, the present invention uses two power supply circuits and connects a plurality of high-frequency amplifiers so that adjacent amplifiers are supplied with power from different power supply circuits. However, only the quantization noise is slightly increased and the output power is reduced, so that the broadcast can be continued as it is and the redundancy is improved.
第１図は本考案の一実施例を示すブロック図、第２図は
従来の振幅変調送信機の一例を示すブロック図である。 １〜10…高周波増幅器、11〜20…インダクタ、21…キャ
パシタ、22…発振器、23…Ａ−Ｄ変換器、24…デコー
ダ、25〜27…電源回路。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional amplitude modulation transmitter. 1 to 10 high-frequency amplifiers, 11 to 20 inductors, 21 capacitors, 22 oscillators, 23 A / D converters, 24 decoders, 25 to 27 power supply circuits.
Claims (1)
号により増幅動作をそれぞれオンオフ制御されて前記搬
送波信号を増幅する縦方向に配置される複数の高周波増
幅器と、前記複数の高周波増幅器の出力を電圧加算する
合成回路と、アナログ音声信号の振幅に応じて前記複数
の高周波増幅器に対し縦方向配置の下段から上段に向け
ての動作数を制御するように前記ビット信号を生成して
前記複数の高周波増幅器へそれぞれ送出するデコーダ
と、前記複数の高周波増幅器に電源を供給する２つの電
源回路とを備え、前記縦方向に配置される複数の高周波
増幅器の隣接する増幅器が互いに異なる前記電源回路か
ら電源をそれぞれ供給されることを特徴とする振幅変調
送信機。An oscillator for outputting a carrier signal; a plurality of high-frequency amplifiers arranged in a vertical direction for amplifying the carrier signal by controlling an amplification operation on and off by a bit signal; and an output of the plurality of high-frequency amplifiers. A synthesis circuit for adding a voltage, and generating the bit signals so as to control the number of operations from the lower stage to the upper stage in the vertical direction with respect to the plurality of high-frequency amplifiers according to the amplitude of the analog audio signal. A power supply circuit for supplying power to the plurality of high-frequency amplifiers; and a power supply circuit for supplying power to the plurality of high-frequency amplifiers. Are respectively supplied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990104609U JP2587849Y2 (en) | 1990-10-04 | 1990-10-04 | Amplitude modulation transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990104609U JP2587849Y2 (en) | 1990-10-04 | 1990-10-04 | Amplitude modulation transmitter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0461947U JPH0461947U (en) | 1992-05-27 |
| JP2587849Y2 true JP2587849Y2 (en) | 1998-12-24 |
Family
ID=31849954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990104609U Expired - Lifetime JP2587849Y2 (en) | 1990-10-04 | 1990-10-04 | Amplitude modulation transmitter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2587849Y2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60254906A (en) * | 1984-05-31 | 1985-12-16 | Nec Corp | High frequency power amplifier device |
| JPS6162213A (en) * | 1984-09-03 | 1986-03-31 | Toshiba Corp | Amplitude modulation high frequency power amplifier |
| JPS61159829A (en) * | 1985-01-07 | 1986-07-19 | Sapporo Tv Hoso Kk | Uninterruptive transmitting system of transmitter |
-
1990
- 1990-10-04 JP JP1990104609U patent/JP2587849Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0461947U (en) | 1992-05-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |