JP2001148849A - Video control system for multiple dwelling house - Google Patents

Video control system for multiple dwelling house

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Publication number
JP2001148849A
JP2001148849A JP33006299A JP33006299A JP2001148849A JP 2001148849 A JP2001148849 A JP 2001148849A JP 33006299 A JP33006299 A JP 33006299A JP 33006299 A JP33006299 A JP 33006299A JP 2001148849 A JP2001148849 A JP 2001148849A
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video signal
video
camera
distance
signal
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JP33006299A
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Japanese (ja)
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Noriyuki Matsuoka
則行 松岡
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Aiphone Co Ltd
アイホン株式会社
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Abstract

PROBLEM TO BE SOLVED: To automatically correct a high frequency attenuation frequency characteristic for a video signal fluctuated corresponding to a distance of a transmission line by detecting the distance of the transmission line on the basis of a level of a color burst signal included in the video signal. SOLUTION: The video control system for multiple dwelling house is provided with entrance units 1a, 1b, 1c with a camera that transmit a video signal captured by the camera, a video controller 2 having a video signal modulation section 11 that is connected respectively to the transmission line L1a, L1b, L1c with the camera and modulates the video signal, a living room monitor 3 having a video signal demodulation section 20 that demodulates the modulated video signal and a video display section 21 that displays the demodulated video signal, and the video controller 2 is provided with a detection section 10 that detects the distance of the transmission line from the entrance units 1a, 1b, 1c with the camera depending on the level of a color burst signal included in the video signal from the entrance units 1a, 1b, 1c with the camera and with a frequency characteristic correction section 12 that corrects the high frequency attenuation frequency characteristic fluctuated in the distance of the transmission line with the detection signal of distance from the detection section.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は集合住宅用映像制御装置に係り、特に映像信号を伝送する伝送路の距離の制約が解消され、S/N比の向上に伴いノイズが抑制された良好な映像を表示させることができる集合住宅用映像制御装置に関する。 The present invention relates to relates to a video control device for a collective housing, and eliminates the particular constraints of the distance of the transmission path for transmitting a video signal, good noise with improvement in S / N ratio is suppressed It relates to a video control device for a collective housing capable of displaying video.

【0002】 [0002]

【従来の技術】従来から、図3のブロック図に示す構成の集合住宅用映像制御装置が提案されている。 Heretofore, collective housing video control apparatus shown in the block diagram of FIG. 3 has been proposed.

【0003】同図に示す集合住宅用映像制御装置は、映像撮像機能としてカメラ(図示せず)より取り込んだ映像信号を送出する(複数の)カメラ付玄関機51a、5 [0003] Housing video controller shown in the figure, and sends a video signal taken by the camera (not shown) as an image pickup function (s) with a camera entrance machine 51a, 5
1b、51cと、各カメラ付玄関機51a、51b、5 1b, 51c and, entrance unit 51a with each camera, 51b, 5
1cに接続される伝送路L51a、L51b、L51c(線路長L51a<L51b<L51c)の距離に応じて変動する当該映像信号の周波数特性を手動で補正するケーブル補償器5 Transmission line L51a connected to 1c, L51b, L51c (line length L51a <L51b <L51c) cable compensator to correct the frequency characteristic of the video signal which varies as a function of the distance manually 5
2a、52b、52cと、各ケーブル補償器52a、5 2a, 52 b, and 52c, each cable compensators 52a, 5
2b、52cを介して周波数特性が補正された映像信号を変調する映像信号変調部60を有する映像制御機53 2b, video controller 53 with a video signal modulator 60 which frequency characteristics to modulate the corrected video signal via 52c
と、映像制御機53の映像信号変調部60を介して変調された映像信号を復調する映像信号復調部70、映像信号復調部70を介して復調された映像信号を映像表示する映像表示部71を有する居室モニタ54とで構成されている。 If the video display unit 71 for display a video signal demodulated through a video signal demodulator 70, a video signal demodulator 70 for demodulating the video signal modulated through the video signal modulator 60 of the video controller 53 It is composed of a room monitor 54 having a.

【0004】このように構成された集合住宅用映像制御装置において、各カメラ付玄関機51a、51b、51 [0004] In such configured collective housing video control device, entrance unit 51a with each camera, 51b, 51
cのカメラ(図示せず)より取り込まれ、伝送路L51 c captured from a camera (not shown) of the transmission line L51
a、L51b、L51cをそれぞれ伝送された映像信号は、各ケーブル補償器52a、52b、52cを介して当該伝送路の距離に対応して変動する周波数特性が補正された当該映像信号として映像制御機53の映像信号変調部6 a, L51b, respectively transmitted video signals L51c, each cable compensators 52a, 52b, via 52c video controller as the video signal frequency characteristic is corrected to vary in response to the distance of the transmission path 53 video signal modulator 6
0に送出される。 0 is sent to.

【0005】映像制御機53の映像信号変調部60は、 [0005] The video signal modulator 60 of the video controller 53,
各ケーブル補償器52a、52b、52cを介して周波数成分が補正された映像信号を変調し居室モニタ54の映像信号復調部70に送出する。 Each cable compensators 52a, 52b, the frequency components through 52c is sent to the picture signal demodulation unit 70 of the room monitor 54 modulates the video signal corrected.

【0006】居室モニタ54の映像信号復調部70は、 [0006] The video signal demodulator 70 of the room monitor 54,
映像制御機53の映像信号変調部60を介して変調された映像信号を復調し映像表示部71に映像表示させる。 It demodulates the video signal modulated through the video signal modulator 60 of the video controller 53 to the video display on the video display unit 71.

【0007】 [0007]

【発明が解決しようとする課題】しかしながら、従来の集合住宅用映像制御装置は上述のように構成されているので、各カメラ付玄関機51a、51b、51cのカメラ(図示せず)より取り込まれた映像(映像信号)を居室モニタ54の映像表示部71にて映像表示するためには、各ケーブル補償器52a、52b、52cを介して伝送路L51a、L51b、L51cの距離に対応して変動する周波数特性を手動で補正せねばならず煩雑さを有する難点があるとともに、当該装置を構成するにあたり製造コストが増大する難点があった。 [SUMMARY OF THE INVENTION However, conventional collective housing video controller which is configured as described above, captured from each camera with entrance machine 51a, 51b, 51c of the camera (not shown) and in order to display video images (video signal) by the video display unit 71 of the room monitor 54, the transmission line L51a, L51b, varies corresponding to the distance L51c through the cable compensators 52a, 52b, and 52c with the frequency characteristic has a drawback with the complexity it must take into manually corrected for, manufacturing cost in configuring the device there is a difficulty to increase.

【0008】本発明は上述の難点を解消するためになされたもので、映像信号に含まれるカラーバースト信号のレベルをもとに伝送路の距離を検出し、伝送路の距離に対応して変動する映像信号の高域減衰周波数特性を自動で補正させた集合住宅用映像制御装置を提供することを目的とする。 [0008] The present invention has been made to solve the above drawbacks, to detect the distance of the transmission path based on the level of the color burst signal included in the video signal, varies with the distance of the transmission path and to provide a high-frequency attenuation frequency characteristic collective housing video control device with automatically correct the image signal to be.

【0009】 [0009]

【課題を解決するための手段】このような目的を達成するため、本発明による集合住宅用映像制御装置は、カメラより取り込んだ映像信号を送出するカメラ付玄関機と、カメラ付玄関機に伝送路でそれぞれ接続され映像信号を変調する映像信号変調部を有する映像制御機と、変調された映像信号を復調する映像信号復調部、復調された映像信号を映像表示する映像表示部を有する居室モニタとで構成され、映像制御機は、カメラ付玄関機からの映像信号に含まれるカラーバースト信号のレベルによりカメラ付玄関機からの伝送路の距離を検出する検出部と、検出部からの距離の検出信号により伝送路の距離に応じて変動する高域減衰周波数特性を補正する周波数特性補正部とを備えたものである。 Means for Solving the Problems] To achieve the above object, collective housing image control apparatus according to the present invention transmits a camera-equipped entrance device for sending a video signal taken by the camera, the entrance-equipped camera a video controller having a video signal modulator for modulating the video signal are connected by road, video signal demodulator for demodulating the modulated video signal, room monitor having an image display unit for displaying video image signal demodulated is composed of a video controller includes a detector for detecting the distance of the transmission path from the camera-equipped entrance machine the level of the color burst signal included in the video signal from the entrance-equipped camera, the distance from the detector it is obtained by a frequency characteristic correcting unit that compensates the high-frequency attenuation frequency characteristic which varies as a function of the distance of the transmission path by the detection signal.

【0010】このような集合住宅用映像制御装置において、映像制御機の検出部は、カメラより取り込まれたカメラ付玄関機から伝送路を伝送された映像信号に含まれるカラーバースト信号のレベルをもとに、当該伝送路の距離を検出する。 [0010] In such a collective housing video control apparatus, the detection portion of the video controller, the level of the color burst signal contained in the video signal transmitted through the transmission line from the captured entrance-equipped cameras from cameras DOO in, it detects the distance of the transmission path. 映像制御機の周波数特性補正部は、検出部からの距離の検出信号をもとに伝送路の距離に対応して変動する映像信号の高域減衰周波数特性を自動で補正し、居室モニタの映像信号復調部からの出力波形(復調波)が正常に再現されるよう映像信号変調部の変調波の周波数成分をカラーバースト信号のレベルの減衰が生じないレベルに制御する。 Frequency characteristic correction unit of the image controller corrects high-frequency attenuation frequency characteristics of the video signal which is varied corresponding to the distance of the transmission path based on the detection signal of the distance from the detector automatically, the room monitor picture controlling the frequency components of the modulated wave of the video signal modulator so that the output waveform from the signal demodulation unit (demodulation wave) is reproduced normally to a level which attenuates the level of the color burst signal does not occur. これにより、映像信号を伝送する伝送路の距離の制約が解消され、S/N比の向上に伴いノイズが抑制された良好な映像を居室モニタの映像表示部に表示させることができる。 Accordingly, restriction of the distance of the transmission path for transmitting a video signal is eliminated, the noise due to the improvement of the S / N ratio can be displayed a good image with suppressed on the video display unit of the room monitor.

【0011】 [0011]

【発明の実施の形態】以下、本発明による集合住宅用映像制御装置を適用した好ましい形態の一実施例について、図面を参照して説明する。 DETAILED DESCRIPTION OF THE INVENTION Hereinafter, an embodiment of a preferred form of applying the collective housing image control apparatus according to the present invention will be described with reference to the drawings.

【0012】図1は本発明による集合住宅用映像制御装置の一実施例の構成を示すブロック図であり、映像撮像機能としてカメラ(図示せず)より取り込んだ映像信号を送出する(複数の)カメラ付玄関機1a、1b、1c [0012] Figure 1 is a block diagram showing the structure of an embodiment of a collective housing image control apparatus according to the present invention, it sends a video signal taken by the camera (not shown) as an image pickup function (s) entrance machine 1a with a camera, 1b, 1c
と、各カメラ付玄関機1a、1b、1cに接続される伝送路L1a、L1b、L1c(線路長L1a<L1b<L1c)の距離を、伝送される映像信号に含まれるカラーバースト信号のレベル(以下、振幅レベルと称す)により検出する検出部10、各伝送路L1a、L1b、L1cを伝送された映像信号を変調する映像信号変調部11、検出部10からの距離の検出信号をもとに、各伝送路L1a、L1b、L1c If, entrance device 1a with the cameras, 1b, the transmission path L1a connected to 1c, L1b, L1c (line length L1a <L1b <L1c) the distance, the level of the color burst signal included in the video signal to be transmitted ( hereinafter, the detection unit 10 detected by referred to as amplitude levels), each transmission path L1a, L1b, video signal modulator 11 for modulating a video signal transmitted to L1c, based on the detection signal of the distance from the detector 10 , each transmission path L1a, L1b, L1c
の距離に応じて変動し、当該伝送路の表皮効果、絶縁材料の誘電体積等により周波数の平方根にほぼ反比例して振幅レベルが減衰される映像信号の周波数特性(以下、 Vary depending on the distance, the skin effect of the transmission channel, the frequency characteristic of the video signal amplitude level is attenuated in inverse proportion substantially to the square root of the frequency by a dielectric volume, etc. of the insulating material (hereinafter,
高域減衰周波数特性と称す、図2(a)のグラフ図参照)を自動で補正することにより、映像信号変調部11 Referred to as the high-frequency attenuation frequency characteristics, by correcting automatically the reference graph) in FIG. 2 (a), the video signal modulator 11
の変調波の周波数成分をカラーバースト信号の振幅レベルの減衰が生じない所定の閾値レベル(図2(b)のグラフ図参照)に制御する周波数特性補正部12を有する映像制御機2と、映像制御機2の映像信号変調部11を介して変調された映像信号を復調する映像信号復調部2 A video controller 2 having a frequency characteristic correcting unit 12 for controlling the predetermined threshold level the amplitude attenuation level does not occur in the frequency component color burst signal (see graph in FIG. 2 (b)) of the modulated wave, a video video signal demodulator 2 for demodulating a video signal modulated through the video signal modulator 11 of the controller 2
0、映像信号復調部20を介して復調された映像信号を映像表示する映像表示部21を有する居室モニタ3とで構成されている。 0, and a video signal demodulated through a video signal demodulator 20 in the living room monitor 3 having an image display unit 21 for displaying images.

【0013】また、映像信号に含まれるカラーバースト信号とは、水平同期信号のバックポーチ部に例えば3. [0013] The color burst signal included in the video signal, for example, 3 in the back porch of the horizontal synchronizing signal.
85MHzの色副搬送波の8〜12サイクル分を挿入したものであり、当該カラーバースト信号の波高値は、水平同期信号の振幅と同じ大きさとされる(図示せず)。 Is obtained by inserting the 8 to 12 cycles of the color subcarrier of 85MHz, the peak value of the color burst signal, (not shown) is the same size as the amplitude of the horizontal synchronization signal.

【0014】このように構成された集合住宅用映像制御装置において、以下、その動作について図1のブロック図、図2(a)および図2(b)のグラフ図をそれぞれ参照して説明する。 [0014] In such configured collective housing video control device, hereinafter, the block diagram of FIG. 1 for the operation will be described with reference respectively to the graph of FIG. 2 (a) and 2 (b).

【0015】各カメラ付玄関機1a、1b、1cのカメラ(図示せず)より取り込まれた映像信号に含まれるカラーバースト信号は、伝送される伝送路L1a、L1b、L The transmission path L1a color burst signal included in the video signal captured by each camera-equipped entrance machine 1a, 1b, 1c of the camera (not shown) is to be transmitted, L1b, L
1cの表皮効果、絶縁材料の誘電体積等により周波数の平方根にほぼ反比例し、当該伝送路の距離に対応して振幅レベルが減衰される(図2(a)のグラフ図参照)。 1c of the skin effect, approximately in inverse proportion to the square root of the frequency by a dielectric volume, etc. of the insulating material, the amplitude level is attenuated in correspondence to the distance of the transmission path (see graph in FIG. 2 (a)).

【0016】映像制御機2の検出部10は、各伝送路L The detection unit 10 of the image control device 2, each transmission path L
1a、L1b、L1cを伝送された映像信号に含まれるカラーバースト信号の振幅レベルをもとに、当該カメラ付玄関機からの伝送路の距離をそれぞれ検出し、検出された距離の検出信号を周波数特性補正部12に送出する。 1a, L1b, based on the amplitude level of the color burst signal included in the video signal transmitted to L1c, the distance of the transmission path from the entrance-equipped the camera detects each frequency detection signal of the detected distance and it sends to the compensator unit 12. 周波数特性補正部12は、入力された検出信号をなす距離情報をもとに、映像信号変調部11を介して変調される映像信号の変調波の周波数成分を当該伝送路の距離の変動に対応した周波数成分に自動で補正することにより、居室モニタ3の映像信号復調部20からの出力波形(復調波)が正常に再現されるよう当該カラーバースト信号の振幅レベルを減衰が生じない所定の閾値レベルに制御する(図2(b)のグラフ図参照)。 Frequency characteristic correcting unit 12, based on the distance information constituting the inputted detection signals, corresponding to the frequency components of the modulated wave of the video signal is modulated through the video signal modulator 11 to change the distance of the transmission path by correcting automatically the frequency components, a predetermined threshold amplitude level of the color burst signal attenuation does not occur so that the output waveform from the video signal demodulator 20 of the room monitor 3 (demodulated wave) is reproduced normally controlling the level (see graph in Figure 2 (b)). 映像信号変調部11 Video signal modulator 11
は、当該伝送路の距離に応じて変動する高域減衰周波数特性が補正された映像信号を変調し居室モニタ3の映像信号復調部20に送出する。 It is sent to the picture signal demodulation unit 20 of the room monitor 3 high-frequency attenuation frequency characteristic which varies as a function of the distance of the transmission line by modulating a corrected video signal.

【0017】居室モニタ3の映像信号復調部20は、映像制御機2の映像信号変調部11を介して変調された映像信号を復調し映像表示部21に映像表示させる。 The video signal demodulator 20 of the room monitor 3 demodulates the video signal modulated through the video signal modulator 11 of the image control device 2 to a video display on the video display unit 21.

【0018】 [0018]

【発明の効果】以上の説明から明らかなように、本発明の集合住宅用映像制御装置によれば、カメラ付玄関機のカメラより取り込まれた映像信号に含まれるカラーバースト信号のレベルをもとに、当該カメラ付玄関機から映像信号を変調する映像制御機までの伝送路の距離を検出し、当該伝送路の距離に対応して変動する映像信号の高域減衰周波数特性を自動で補正することができる。 As is apparent from the foregoing description, according to the collective housing image control device of the present invention, the level of the color burst signal included in the video signal taken from the entrance machine camera with a camera based on to detect the distance of the transmission path to the video controller for modulating a video signal from the entrance-equipped the camera is corrected automatically high-frequency attenuation frequency characteristics of the video signal which is varied corresponding to the distance of the transmission path be able to. これにより、従来例のように映像信号の高域減衰周波数特性の補正を手動で行なう煩雑さが解消され、かつ伝送路毎に割り当てられるケーブル補償器が不要とされ当該装置を構成するにあたり製造コストを低減することができるとともに、S/N比を向上させるために難点となる伝送路の距離の延長などの制約が解消され、ノイズが抑制された良好な映像を表示させることができる。 Thus, manufacturing cost Upon manually corrected complexity of performing high-frequency attenuation frequency characteristics of the video signal as in the prior art are eliminated, and cables compensator assigned to each transmission path constituting the unnecessary the device the it is possible to reduce, restrictions such as the extension of the distance of the transmission path as a difficulty to improve the S / N ratio is eliminated, noise can be displayed a good image with suppressed.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明による集合住宅用映像制御装置の一実施例の構成を示すブロック図。 Block diagram showing the structure of an embodiment of a set according to the invention; FIG residential video control apparatus.

【図2】本発明による集合住宅用映像制御装置の一実施例において、(a)は伝送路を伝送された映像信号に含まれるカラーバースト信号のレベルと当該伝送路の周波数との関係を示すグラフ図。 [Figure 2] In one embodiment of the collective housing image control apparatus according to the present invention, showing the relationship between (a) the level and frequency of the transmission path of the color burst signal included in the video signal transmitted over the transmission path graph. (b)は高域減衰周波数特性が補正された映像信号に含まれるカラーバースト信号のレベルと伝送路の周波数との関係を示すグラフ図。 (B) is a graph showing a relationship between a frequency of the level and the transmission path of the color burst signal high-pass attenuation frequency characteristics is included in the corrected video signal.

【図3】従来の集合住宅用映像制御装置の構成を示すブロック図。 FIG. 3 is a block diagram showing a configuration of a conventional collective housing video control apparatus.

【符号の説明】 DESCRIPTION OF SYMBOLS

1a、1b、1c・・・・・カメラ付玄関機 2・・・・・映像制御機 3・・・・・居室モニタ 10・・・・・検出部 11・・・・・映像信号変調部 12・・・・・周波数特性補正部 20・・・・・映像信号復調部 21・・・・・映像表示部 L1a、L1b、L1c・・・・・伝送路 1a, 1b, 1c ..... with a camera entrance machine 2 ..... video controller 3 ----- room monitor 10 ----- detector 11 ..... video signal modulator 12 ----- frequency characteristic correcting portion 20 ----- video signal demodulator 21 ----- image display unit L1a, L1b, L1c ..... transmission path

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 5C054 DA08 EA01 EA03 ED12 ED15 EE01 EG08 EJ05 FB04 HA22 5C057 AA01 AA03 BA02 CB07 CC01 DA11 DB02 DC02 DC09 EA17 EB05 EC01 EC02 EC12 EF01 GC02 GE02 GH01 GH05 5C066 AA01 BA02 CA05 EB11 EC02 EC11 EF04 GA05 GA16 KA13 KC03 KD02 KD06 KP02 5K046 AA01 BA00 BB03 DD11 EE00 EE01 EE12 EE42 ────────────────────────────────────────────────── ─── front page of continued F-term (reference) 5C054 DA08 EA01 EA03 ED12 ED15 EE01 EG08 EJ05 FB04 HA22 5C057 AA01 AA03 BA02 CB07 CC01 DA11 DB02 DC02 DC09 EA17 EB05 EC01 EC02 EC12 EF01 GC02 GE02 GH01 GH05 5C066 AA01 BA02 CA05 EB11 EC02 EC11 EF04 GA05 GA16 KA13 KC03 KD02 KD06 KP02 5K046 AA01 BA00 BB03 DD11 EE00 EE01 EE12 EE42

Claims (1)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】カメラより取り込んだ映像信号を送出するカメラ付玄関機(1a、1b、1c)と、前記カメラ付玄関機に伝送路(L1a、L1b、L1c)でそれぞれ接続され前記映像信号を変調する映像信号変調部(11)を有する映像制御機(2)と、変調された映像信号を復調する映像信号復調部(20)、復調された前記映像信号を映像表示する映像表示部(21)を有する居室モニタ(3)とで構成され、 前記映像制御機は、前記カメラ付玄関機からの前記映像信号に含まれるカラーバースト信号のレベルにより前記カメラ付玄関機からの前記伝送路の距離を検出する検出部(10)と、前記検出部からの距離の検出信号により前記伝送路の距離に応じて変動する高域減衰周波数特性を補正する周波数特性補正部(12)とを備えたことを 1. A camera with entrance device for sending a video signal taken from the camera (1a, 1b, 1c) and the transmission line to the entrance-equipped the camera (L1a, L1b, L1c) the video signal is connected with a video signal modulator for modulating (11) the video controller having a (2), a video signal demodulator (20) for demodulating the modulated video signal, the video display unit (21 for displaying images of the video signal demodulated ) is constituted out with room monitor (3) having a, the image control unit, the distance of the transmission path from the entrance-equipped camera on the level of the color burst signal included in the video signal from the entrance-equipped the camera a detection unit for detecting (10) a, that a frequency characteristic correction unit for correcting (12) the high-frequency attenuation frequency characteristic which varies as a function of the distance of the transmission path by the detection signal of the distance from the detector the 特徴とする集合住宅用映像制御装置。 Set and said housing for the video controller.
JP33006299A 1999-11-19 1999-11-19 Video control system for multiple dwelling house Pending JP2001148849A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33006299A JP2001148849A (en) 1999-11-19 1999-11-19 Video control system for multiple dwelling house

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Application Number Priority Date Filing Date Title
JP33006299A JP2001148849A (en) 1999-11-19 1999-11-19 Video control system for multiple dwelling house

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JP2001148849A true JP2001148849A (en) 2001-05-29

Family

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Family Applications (1)

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JP33006299A Pending JP2001148849A (en) 1999-11-19 1999-11-19 Video control system for multiple dwelling house

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Country Link
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003111068A (en) * 2001-09-27 2003-04-11 Nohmi Bosai Ltd Multiple dwelling house intercom system
JP2005525729A (en) * 2002-02-15 2005-08-25 アヴォセント コーポレイション Automatic equalization of the video signal
JP2007208535A (en) * 2006-01-31 2007-08-16 Aiphone Co Ltd Multiple dwelling house interphone system
JP2008048049A (en) * 2006-08-11 2008-02-28 Matsushita Electric Works Ltd Intercom system for multiple dwelling house
KR101033054B1 (en) 2009-02-12 2011-05-06 미쓰비시덴키 가부시키가이샤 Display device
JP2011151731A (en) * 2010-01-25 2011-08-04 Denso Corp Vehicle periphery monitoring apparatus
US9560371B2 (en) 2003-07-30 2017-01-31 Avocent Corporation Video compression system
US9743095B2 (en) 2002-10-01 2017-08-22 Avocent Corporation Video compression encoder

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003111068A (en) * 2001-09-27 2003-04-11 Nohmi Bosai Ltd Multiple dwelling house intercom system
JP4629932B2 (en) * 2001-09-27 2011-02-09 能美防災株式会社 Apartment house intercom system
JP2005525729A (en) * 2002-02-15 2005-08-25 アヴォセント コーポレイション Automatic equalization of the video signal
US9743095B2 (en) 2002-10-01 2017-08-22 Avocent Corporation Video compression encoder
US9560371B2 (en) 2003-07-30 2017-01-31 Avocent Corporation Video compression system
JP2007208535A (en) * 2006-01-31 2007-08-16 Aiphone Co Ltd Multiple dwelling house interphone system
JP2008048049A (en) * 2006-08-11 2008-02-28 Matsushita Electric Works Ltd Intercom system for multiple dwelling house
KR101033054B1 (en) 2009-02-12 2011-05-06 미쓰비시덴키 가부시키가이샤 Display device
JP2011151731A (en) * 2010-01-25 2011-08-04 Denso Corp Vehicle periphery monitoring apparatus
US8581984B2 (en) 2010-01-25 2013-11-12 Denso Corporation Vehicle circumference monitor apparatus

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