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integrated interchip sound (I2S)

The I2S bus, which stands for Inter- IC Sound or Integrated Interchip Sound, is a unidirectional bus for the transmission of audio data. It was developed by Philips and transfers audio data between two active audio modules, a master and a slave. The modules can be ICs, digitalsignal processors( DSP), AD converters, DA converters or audio codecs. Since the I2S bus has no addressing, only two stations connected to the bus may be active at any time. If several modules are connected, they are deactivated.

The data transfer via the I2S bus is done by four lines for the clock signal (Clock), the word selection (Word Select), the data output (Data Out) and the data input (Data In). The Word Select line provides the channel assignment of the left and right channel in stereo. The clock pulses for the bit clock correspond to the individual bits on the data line. This means that the clock frequency is a multiple of the sampling rate. It is calculated by multiplying the number of bits per channel by the number of channels. For example, the data transfer rate for CD drives is 1.41 Mbit/s, which is calculated from the sampling rate of 44.1 kHz and the sampling depth of 16 bits; for audio CDs with two audio channels, it would be twice as high. For Digital Audio Tape( DAT) it is 1.536 Mbit/s and for Super Audio CD it is 4.6 Mbit/s.

The I2S bus is related to the SPI bus, Serial Peripheral Interface, with the difference that the bit widths of the data words for the two stereo channels are different. Furthermore, there is no word selection line in the SPI bus.

Informations:
Englisch: integrated interchip sound - I2S
Updated at: 26.11.2009
#Words: 280
Links: bus, identification code (IC), unidirectional, transmission, audio data (AU)
Translations: DE
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