Key |
Type |
Value |
---|---|---|
Type |
name |
(Optional) The type of PDF object that this dictionary describes; if present, shall be Sound for a sound object. |
R |
number |
(Required) The sampling rate, in samples per second. |
C |
integer |
(Optional) The number of sound channels. Default value: 1. |
B |
integer |
(Optional) The number of bits per sample value per channel. Default value: 8. |
E |
name |
(Optional) The encoding format for the sample data: Raw Unspecified or unsigned values in the range 0 to 2B − 1 Signed Twos-complement values muLaw m-law–encoded samples ALaw A-law–encoded samples Default value: Raw. |
CO |
name |
(Optional) The sound compression format used on the sample data. (This is separate from any stream compression specified by the sound object’s Filterentry; see Table 5 and 7.4, “Filters.” ) If this entry is absent, sound compression shall not be used; the data contains sampled waveforms that shall be played at R samples per second per channel. |
CP |
(various) |
(Optional) Optional parameters specific to the sound compression format used. No standard values have been defined for the CO and CP entries. |