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Video::Frequencies.3pm

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 companeded 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 cable HRC          %NTSC_CABLE_HRC
    JP broadcast          %NTSC_BCAST_JP
    JP cable              %NTSC_CABLE_JP
    Argentina             %PAL_ARGENTINA
    Australia             %PAL_AUSTRALIA
    Australia optus       %PAL_AUSTRALIA_OPTUS
    China broadcast       %PAL_BCAST_CN
    Europe West           %PAL_EUROPE_WEST
    Europe East           %PAL_EUROPE_EAST
    Italy                 %PAL_ITALY
    Ireland               %PAL_IRELAND
    Newzealand            %PAL_NEWZEALAND
    South Africa bcast    %PAL_BCAST_ZA
    France                %SECAM_FRANCE
    Russia                %SECAM_RUSSIA
 
    CCIR frequencies      %FREQ_CCIR_I_III
                          %FREQ_CCIR_SL_SH
                          %FREQ_CCIR_H
    OIRT frequencies      %FREQ_OIRT_I_III
                          %FREQ_OIRT_SL_SH
                          %FREQ_OIRT_H
                          %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 <pcg@goof.com>