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id="favatar85679" class="pls favatar"> <a name="lastpost"></a><div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-5242.html" target="_blank" class="xw1" style="color: #FFCC00">lyh6328</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo85679" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo85679_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-5242.html" target="_blank" class="xi2" style="color: #FFCC00">lyh6328</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=5242&do=profile" target="_blank" class="xi2">6390</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=5242&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=lyh6328" id="a_showip_li_85679" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=lyh6328" id="a_repent_85679" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-5242.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=5242&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <div id="fj" class="y"> <label class="z">电梯直达</label> <input type="text" class="px p_fre z" size="2" onkeyup="$('fj_btn').href='forum.php?mod=redirect&ptid=10408&authorid=0&postno='+this.value" onkeydown="if(event.keyCode==13) {window.location=$('fj_btn').href;return false;}" title="跳转到指定楼层" /> <a href="javascript:;" id="fj_btn" class="z" title="跳转到指定楼层"><img src="static/image/common/fj_btn.png" alt="跳转到指定楼层" class="vm" /></a> </div> <strong> <a href="http://bbs.oecr.com/thread-10408-1-1.html" id="postnum85679" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>1</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon85679" src="static/image/common/online_member.gif" /> <em id="authorposton85679">发表于 2003-4-1 21:00:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=10408&page=1&authorid=5242" rel="nofollow">只看该作者</a> <span class="none"><img src="static/image/common/arw_r.gif" class="vm" alt="回帖奖励" /></span> <span class="pipe show">|</span><a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=10408&extra=&ordertype=2" class="show">正序浏览</a> <span class="pipe show">|</span><a href="javascript:;" onclick="readmode($('thread_subject').innerHTML, 85679);" class="show">阅读模式</a> </div> </div> </div><div class="pct"><style type="text/css">.pcb{margin-right:0}</style><div class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_85679"> 虽然人们习惯将家用摄录一体机称作摄象机,不过由于它是通过“摄”和“录”来共同完成任务的,因此在讲到它的历史时,就不可避免地要从家用录象机的诞生谈起。<br /> <br /> l975年索尼公司推出第一台家用录象机Betamax,中义译为贝特马可思,人们可以在家中录制精彩的电视节目了.当时在美国如日中天的RCA公司非常看好录象机市场,就想让当时还在美国创牌子打天下的索尼为其生产录象机,条伴是打RCA牌子.富有个性的索尼断然拒绝了此要求,从而激怒了RCA这第一大牌.于是RCA找到了松下,准备研制一种新型机来挤掉索尼。l976年,日本JVC公司发表了VHS系统,它在录制时间及磁带大小上比索尼占有优势。于是VHS与Beta两大家用录象系统爆发了“激战”,“战争”愈演愈烈。RCA与松下自然会支待JVC的VHS,而索尼绝不会轻易相让。1982年索尼开发了HiFi立体声Beta录象机,音频动态范围超过了80dB,这在当时是了不起的.1985年索尼又推出了Super Beta,水平清晰度提升至270线,紧接着VHS阵营就推出了HQ VHS(High Quality VHS),这样在技术上Beta已破VHS赶上了.<br /> <br /> <br /> </td></tr></table> </div> <div id="comment_85679" class="cm"> </div> <div id="post_rate_div_85679"></div> </div> </div> </td></tr> <tr><td class="plc plm"> <div id="p_btn" class="mtw mbm hm cl"> <a 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href="http://club.oecr.com/space-uid-7090.html" target="_blank" class="xi2" style="color: #0033CC">shlh</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=7090&do=profile" target="_blank" class="xi2">75</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=7090&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a href="http://club.oecr.com/home.php?mod=magic&mid=showip&idtype=user&id=shlh" id="a_showip_li_85684" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/showip.small.gif" alt="" /> IP卡</a> <a href="http://club.oecr.com/home.php?mod=magic&mid=checkonline&idtype=user&id=shlh" id="a_repent_85684" class="xi2" onclick="showWindow(this.id, this.href)"><img src="static//image/magic/checkonline.small.gif" alt="" /> 狗仔卡</a> </div> <div id="avatarfeed"><span id="threadsortswait"></span></div> </div> </div> <div> <div class="avatar"><a href="http://club.oecr.com/space-uid-7090.html" class="avtm" target="_blank"><img src="http://www.oecr.com/uc_server/avatar.php?uid=7090&size=middle" /></a></div> </div> </div> </td> <td class="plc"> <div class="pi"> <strong> <a href="http://bbs.oecr.com/forum.php?mod=redirect&goto=findpost&ptid=10408&pid=85684" id="postnum85684" onclick="setCopy(this.href, '帖子地址复制成功');return false;"> <em>6</em>楼</a> </strong> <div class="pti"> <div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon85684" src="static/image/common/online_member.gif" /> <em id="authorposton85684">发表于 2003-8-24 02:04:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=10408&page=1&authorid=7090" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <h2>家用摄像机的成长历程(转自高海鹏)</h2> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_85684"> 很好啊</td></tr></table> </div> <div id="comment_85684" class="cm"> </div> <div id="post_rate_div_85684"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition85684"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" href="forum.php?mod=post&action=reply&fid=34&tid=10408&repquote=85684&extra=&page=1" onclick="showWindow('reply', this.href)">回复</a> <a class="replyadd" href="forum.php?mod=misc&action=postreview&do=support&tid=10408&pid=85684&hash=79032b9e" onclick="showWindow('login', this.href)" onmouseover="this.title = ($('review_support_85684').innerHTML ? $('review_support_85684').innerHTML : 0) + ' 人 支持'">支持 <span id="review_support_85684"></span></a> <a class="replysubtract" href="forum.php?mod=misc&action=postreview&do=against&tid=10408&pid=85684&hash=79032b9e" onclick="showWindow('login', this.href)" onmouseover="this.title = 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cellspacing="0" cellpadding="0"> <tr> <td class="pls" rowspan="2"> <div id="favatar85683" class="pls favatar"> <div class="pi"> <div class="authi"><a href="http://club.oecr.com/space-uid-1768.html" target="_blank" class="xw1" style="color: #FF99FF">default</a> </div> </div> <div class="p_pop blk bui card_gender_" id="userinfo85683" style="display: none; margin-top: -11px;"> <div class="m z"> <div id="userinfo85683_ma"></div> </div> <div class="i y"> <div> <strong><a href="http://club.oecr.com/space-uid-1768.html" target="_blank" class="xi2" style="color: #FF99FF">default</a></strong> <em>当前离线</em> </div><dl class="cl"> <dt>积分</dt><dd><a href="http://club.oecr.com/home.php?mod=space&uid=1768&do=profile" target="_blank" class="xi2">1790</a></dd> </dl><div class="imicn"> <a href="http://club.oecr.com/home.php?mod=space&uid=1768&do=profile" target="_blank" title="查看详细资料"><img src="static/image/common/userinfo.gif" alt="查看详细资料" /></a> <a 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<div class="pdbt"> </div> <div class="authi"> <img class="authicn vm" id="authicon85683" src="static/image/common/online_member.gif" /> <em id="authorposton85683">发表于 2003-4-1 21:48:00</em> <span class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=10408&page=1&authorid=1768" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <h2>家用摄像机的成长历程(转自高海鹏)</h2> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_85683"> 不过相对来说，现在的DC也具有了摄像功能，同时也具有DV所无法比拟的静态图象分析能力；而且，随着DC摄像功能的完善，我相信DV的市场会越来越小，或者说DC和DV在不久的将来有可能会融合一体。</td></tr></table> </div> <div id="comment_85683" class="cm"> </div> <div id="post_rate_div_85683"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition85683"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" 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class="pct"><div class="pcb"> <h2>家用摄像机的成长历程(转自高海鹏)</h2> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_85682"> 谈到DV系统的画质、音质,我们不妨与LD比较一下,DV/mini DV的解析度为500线,视顿讯噪比为54dB&#59;而LD的解析度为425线,高档机的视频讯噪比为52dH。这样一比DV/mini DV应胜出LD一筹.音质上DV系统具有不低于CD的音质,与Hi8或S-VHS-C相比,DV系统更是领先太多。Hi8与S-VHS-C水平解析度为400线, 视顿讯比均为45dB,这比起DV系统差了很多. 除此之外DV/mini DV系统还有值得一提的地方, 因为是数字方式录制, 所以用数字机对录的时候,图象、声音是不会有损失的,并且可以对接计算机.这是模拟系统根本办不到的.而从母带长期保存及反复观看后的图象还原上讲,模拟系统又输了一大截.<br /> <br /> 因此,DV/mini DV系统的推出,以它特有的小巧.高闽质.高音质,功能的强大,以及众多的日本厂家的大力推广,mini DV摄录机广受欢迎,市场份额也不断攀升,在日本国内已占领大部分市场.<br /> <br /> 总的看来,家用摄像机正在向图象更清晰,操作更简便,体积更小巧的方向发展,价格也越来越低.<br /> </td></tr></table> </div> <div id="comment_85682" class="cm"> </div> <div id="post_rate_div_85682"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr id="_postposition85682"></tr> <tr> <td class="pls"></td> <td class="plc" style="overflow:visible;"> <div class="po hin"> <div class="pob cl"> <em> <a class="fastre" 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class="pct"><div class="pcb"> <h2>家用摄像机的成长历程(转自高海鹏)</h2> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_85681"> 随着模拟摄录技术越来越走向极限,以及日、美、欧、港台等等诸多消费大“户”民用摄录机市场的趋近于饱和,模拟向数字化发展成为必然.<br /> <br /> 在研制数字家用摄录系统的时候,日本各大公司害怕再有Beta与VHS之战,组成了一个名为“高清晰数字录象机协会”(HD Digital VCR Conference)的组织,制定了统一的规格,叫作DV(Digital Video Cassette)。DV恪式分为两种,一种是迎合将来家用的DV录象机,录象时间为270分钟,带子长7.8cm×宽12.5cm×高l.46cm,比V8/Hi8略大一点儿,另一种为家用数码摄录机专用的DV录象带,录象时间为60分钟(LP密录为90分钟),带子长4.8cm×宽6.6cm×高l.22cm,大约只有V8/Hi8的一半大,由于外观小巧迷你又称Mini DV.<br /> <br /> 由于是数码信号,要装下众多信息及实现高画质、高音质、视频压缩不可避免,不过DV系统的压缩比要远低于DVD,视频压缩率为5倍,理沦上应比DVD强一点儿,数位缺陷也应不会产生.DV系统的亮度信号的取样频率高达l3.5MHz,而色信号的取样频率也可达3.375MHz。清晰度理论上可达500线.视频讯噪比可达54dB。DV系统在音响方面也很考究和实用,有l6bit/48kHz、44.1kHz、32kHz两声道及l2bit/32kHz四声道几种规格,四声道可做为两组立体声的音源,彼此可以混音,后期制作相当的方便.<br /> <br /> <br /> </td></tr></table> </div> <div id="comment_85681" class="cm"> </div> <div id="post_rate_div_85681"></div> </div> </div> </td></tr> <tr><td class="plc plm"> </td> </tr> <tr 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class="pipe">|</span> <a href="http://bbs.oecr.com/forum.php?mod=viewthread&tid=10408&page=1&authorid=5242" rel="nofollow">只看该作者</a> </div> </div> </div><div class="pct"><div class="pcb"> <h2>家用摄像机的成长历程(转自高海鹏)</h2> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_85680"> l987年是决定命运的一年,3月JVC公司率先发表了高画质的S-VHS(Super VHS),清晰度一举提升至400线。这使得在数量上本已占优的VHS在技术上也占了优。尽管索尼很快推出了Super Hi-Band,但解象度只有300线,直至近8个月之后索尼才推出了ED Beta,虽解忻度达到500线,但录制时间较短,且晚于S-VHS甚多。再加上美国RCA及松下的支待,索尼“全军覆没”,除技术之外,所有的汗水与金钱付诸东流.<br /> <br /> VHS与Beta之战,VHS可谓“先胜”。此战的胜利使VHS系统在摄象机家用市场上占尽优势,有鉴于此,索尼公司力图东山再起,主攻摄象机家用市场.针对VHS体积大的缺点,而推出了带宽只有8mm,录影时间达60分钟的Video8(V8)手掌式摄象机.这种掌中宝摄象机的推出,立刻在市场上大受欢迎。这使VHS阵营措手不及,JVC紧急推出VHS-Compact(VHS-C)来对抗,但因摄录时间较短使得V8大占优势。l989年索尼又推出了400线解象度的Video Hi8(Hi8).JVC也推出了S?/FONTVHS-C型解象度也达400线,而C型机摄录时间为45分钟,比Hi8的l20分钟少了很多.因此索尼的V8及Hi8抢回了不少市场。而VHS的普及程度,VHS空白带的低价位,以及JVC推出的VHS/VHS-C,S-VHS/S-VHS-C转换匣,使V8及Hi8的势头得到一定程度的扼制。在除美国以外的市场上,V8及Hi8的销量已全面超过了VHS-C及S-VHS-C.<br /> <br /> <br /> 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