Marc Lehmann > Video-Capture-V4l > Video::Frequencies

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NAME ^

Video::Frequencies - Many, many frequency constants and lists.

SYNOPSIS ^

   use Video::Frequencies;

   while (my($name,$list) = each %CHANLIST) {
      print "$name\n";
      while (my($channel,$freq) = each %$list) {
         printf "   %-4s %9d\n", $channel, $freq;
      }
      print "\n";
   }

DESCRIPTION ^

This module exports (yes, exports!) frequency constants as well as hashes with channel => frequency relations for digital and analog video and audio broadcast. Another, shorter way to put it is "worldwide channel/frequency list". All frequencies are given in kHz.

It's a good idea to use perldoc -m Video::Frequencies to get an idea on how the various constants and lists look like.

Exported Audio Carrier Frequencies ^

   NTSC_AUDIO_CARRIER
   PAL_AUDIO_CARRIER_I
   PAL_AUDIO_CARRIER_BGHN
   PAL_AUDIO_CARRIER_MN
   PAL_AUDIO_CARRIER_D
   SEACAM_AUDIO_DKK1L
   SEACAM_AUDIO_BG      
   NICAM728_PAL_BGH
   NICAM728_PAL_I

NICAM 728 32-kHz, 14-bit digital stereo audio is transmitted in 1ms frames containing 8 bits frame sync, 5 bits control, 11 bits additional data, and 704 bits audio data. The bit rate is reduced by transmitting only 10 bits plus parity of each 14 bit sample, the largest sample in a frame determines which 10 bits are transmitted. The parity bits for audio samples also specify the scaling factor used for that channel during that frame. The companded audio data is interleaved to reduce the influence of dropouts and the whole frame except for sync bits is scrambled for spectrum shaping. Data is modulated using QPSK, at below following subcarrier freqs

Broadcast Format by Country ^

(M) NTSC

Antigua, Aruba, Bahamas, Barbados, Belize, Bermuda, Bolivia, Burma, Canada, Chile, Colombia, Costa Rica, Cuba, Curacao, Dominican Republic, Ecuador, El Salvador, Guam Guatemala, Honduras, Jamaica, Japan, South Korea, Mexico, Montserrat, Myanmar, Nicaragua, Panama, Peru, Philippines, Puerto Rico, St Christopher and Nevis, Samoa, Suriname, Taiwan, Trinidad/Tobago, United States, Venezuela, Virgin Islands

(B) PAL

Albania, Algeria, Australia, Austria, Bahrain, Bangladesh, Belgium, Bosnia-Herzegovinia, Brunei Darussalam, Cambodia, Cameroon, Croatia, Cyprus, Denmark, Egypt, Ethiopia, Equatorial Guinea, Finland, Germany, Ghana, Gibraltar, Greenland, Iceland, India, Indonesia, Israel, Italy, Jordan, Kenya, Kuwait, Liberia, Libya, Luxembourg, Malaysa, Maldives, Malta, Nepal, Netherlands, New Zeland, Nigeria, Norway, Oman, Pakistan, Papua New Guinea, Portugal, Qatar, Sao Tome and Principe, Saudi Arabia, Seychelles, Sierra Leone, Singapore, Slovenia, Somali, Spain, Sri Lanka, Sudan, Swaziland, Sweden, Switzeland, Syria, Thailand, Tunisia, Turkey, Uganda, United Arab Emirates, Yemen

(N) PAL

Argentina (Combination N), Paraguay, Uruguay

(M) PAL (525/60, 3.57MHz burst)

Brazil

(G) PAL

Albania, Algeria, Austria, Bahrain, Bosnia/Herzegovinia, Cambodia, Cameroon, Croatia, Cyprus, Denmark, Egypt, Ethiopia, Equatorial Guinea, Finland, Germany, Gibraltar, Greenland, Iceland, Israel, Italy, Jordan, Kenya, Kuwait, Liberia, Libya, Luxembourg, Malaysia, Monaco, Mozambique, Netherlands, New Zealand, Norway, Oman, Pakistan, Papa New Guinea, Portugal, Qatar, Romania, Sierra Leone, Singapore, Slovenia, Somalia, Spain, Sri Lanka, Sudan, Swaziland, Sweeden, Switzerland, Syria, Thailand, Tunisia, Turkey, United Arab Emirates, Yemen, Zambia, Zimbabwe

(D) PAL

China, North Korea, Romania, Czech Republic

(H) PAL

Belgium

(I) PAL

Angola, Botswana, Gambia, Guinea-Bissau, Hong Kong, Ireland, Lesotho, Malawi, Nambia, Nigeria, South Africa, Tanzania, United Kingdom, Zanzibar

(B) SECAM

Djibouti, Greece, Iran, Iraq, Lebanon, Mali, Mauritania, Mauritus, Morocco

(D) SECAM

Afghanistan, Armenia, Azerbaijan, Belarus, Bulgaria, Estonia, Georgia, Hungary, Zazakhstan, Lithuania, Mongolia, Moldova, Poland, Russia, Slovak Republic, Ukraine, Vietnam

(G) SECAM

Greece, Iran, Iraq, Mali, Mauritus, Morocco, Saudi Arabia

(K) SECAM

Armenia, Azerbaijan, Bulgaria, Estonia, Georgia, Hungary, Kazakhstan, Lithuania, Madagascar, Moldova, Poland, Russia, Slovak Republic, Ukraine, Vietnam

(K1) SECAM

Benin, Burkina Faso, Burundi, Chad, Cape Verde, Central African Republic, Comoros, Congo, Gabon, Madagascar, Niger, Rwanda, Senegal, Togo, Zaire

(L) SECAM

France

Channel->Frequency Relations ^

The Channel->Frequency relations are stored in the following hashes. The keys are the Channel names, the values are the corresponding frequency in kHz. For example, "arte" is channel "SE6" in the town in Germany I live in, so, consequently, $PAL_EUROPE{SE6} equals 140250, the frequency I have to tune my receiver.

   US broadcast          %NTSC_BCAST
   US cable              %NTSC_CABLE
   US HRC                %NTSC_HRC
   JP broadcast          %NTSC_BCAST_JP
   JP cable              %NTSC_CABLE_JP
   Australia             %PAL_AUSTRALIA
   Europe                %PAL_EUROPE
   Europe East           %PAL_EUROPE_EAST
   Italy                 %PAL_ITALY
   Ireland               %PAL_IRELAND
   Newzealand            %PAL_NEWZEALAND

   CCIR frequencies      %FREQ_CCIR_I_III
                         %FREQ_CCIR_SL_SH
                         %FREQ_CCIR_H
   OIRT frequencies      %FREQ_OIRT_I_III
                         %FREQ_OIRT_SL_SH
                         %FREQ_UHF

The List of Lists ^

The hash %CHANLIST contains name => channel-list pairs, e.g. $CHANLIST{"ntsc-bcast"} contains a reference to %NTSC_BCAST.

AUTHOR ^

Nathan Laredo (laredo@broked.net), adapted to perl by Marc Lehmann <schmorp@schmorp.de>

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