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STA013 Datasheet(PDF) 17 Page - STMicroelectronics |
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STA013 Datasheet(HTML) 17 Page - STMicroelectronics |
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17 / 38 page  The meaning of the flags are shown in the follow- ing tables: MPEG IDs IDex ID 0 0 MPEG 2.5 0 1 reserved 1 0 MPEG 2 1 1 MPEG 1 Layer in Layer III these two flags must be set always to "01". Protection_bit It equals "1" if no redundancy has been added and "0" if redundancy has been added. Bitrate_index indicates the bitrate (Kbit/sec) depending on the MPEG ID. bitrate index ID = 1 ID = 0 ’0000’ free free ’0001’ 32 8 ’0010’ 40 16 ’0011’ 48 24 ’0100’ 56 32 ’0101’ 64 40 ’0110’ 80 48 ’0111’ 96 56 ’1000’ 112 64 ’1001’ 128 80 ’1010’ 160 96 ’1011’ 192 112 ’1100’ 224 128 ’1101’ 256 144 ’1110’ 320 160 ’1111’ forbidden forbidden Sampling Frequency indicates the sampling frequency of the encoded audio signal (KHz) depending on the MPEG ID Sampling Frequency MPEG1 MPEG2 MPEG2.5 ’00’ 44.1 22.05 11.03 ’01’ 48 24 12 ’10’ 32 16 8 ’11’ reserved reserved reserved Padding bit if this bit equals ’1’, the frame contains an addi- tional slot to adjust the mean bitrate to the sam- pling frequency, otherwise this bit is set to ’0’. Private bit Bit for private use. This bit will not be used in the future by ISO/IEC. Mode Indicates the mode according to the following ta- ble. The joint stereo mode is intensity_stereo and/or ms_stereo. mode mode specified ’00’ stereo ’01’ joint stereo (intensity_stereo and/or ms_stereo) ’10’ dual_channel ’11’ single_channel (mono) Mode extension These bits are used in joint stereo mode. They in- dicates which type of joint stereo coding method is applied. The frequency ranges, over which the intensity_stereo and ms_stereo modes are ap- plied, are implicit in the algorithm. Copyright If this bit is equal to ’0’, there is no copyright on the bitstream, ’1’ means copyright protected. Original/Copy This bit equals ’0’ if the bitstream is a copy, ’1’ if it is original. Emphasis Indicates the type of de-emphasis that shall be used. emphasis emphasis specified ’00’ none ’01’ 50/15 microseconds ’10’ reserved ’11’ CCITT J,17 STA013 - STA013B - STA013T 17/38 |
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