Video::Frequencies(3) Many, many frequency constants and lists.


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";


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


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

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
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
Argentina (Combination N), Paraguay, Uruguay
(M) PAL (525/60, 3.57MHz burst)
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
China, North Korea, Romania, Czech Republic
Angola, Botswana, Gambia, Guinea-Bissau, Hong Kong, Ireland, Lesotho, Malawi, Nambia, Nigeria, South Africa, Tanzania, United Kingdom, Zanzibar
Djibouti, Greece, Iran, Iraq, Lebanon, Mali, Mauritania, Mauritus, Morocco
Afghanistan, Armenia, Azerbaijan, Belarus, Bulgaria, Estonia, Georgia, Hungary, Zazakhstan, Lithuania, Mongolia, Moldova, Poland, Russia, Slovak Republic, Ukraine, Vietnam
Greece, Iran, Iraq, Mali, Mauritus, Morocco, Saudi Arabia
Armenia, Azerbaijan, Bulgaria, Estonia, Georgia, Hungary, Kazakhstan, Lithuania, Madagascar, Moldova, Poland, Russia, Slovak Republic, Ukraine, Vietnam
Benin, Burkina Faso, Burundi, Chad, Cape Verde, Central African Republic, Comoros, Congo, Gabon, Madagascar, Niger, Rwanda, Senegal, Togo, Zaire

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
   OIRT frequencies      %FREQ_OIRT_I_III

The List of Lists

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


Nathan Laredo ([email protected]), adapted to perl by Marc Lehmann <[email protected]>