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Model DP524

Two-Channel AC-2 / AC-3
Digital Audio Decoder

Users' Manual

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Summary of Contents for DP524

Page 1: ...Model DP524 Two Channel AC 2 AC 3 Digital Audio Decoder Users Manual MAIN...

Page 2: ...MAIN...

Page 3: ...ility whether in contract in tort under any warranty in negligence or otherwise shall not exceed the cost of repair or replacement of the defective components and under no circumstances shall Dolby La...

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Page 5: ...Chassis Link 3 4 3 5 Configuring the Rear Panel DIP Switch S101 3 4 3 5 1 Switch nos 1 7 8 Test Tone 3 5 3 5 2 Switch nos 2 5 6 Software Download 3 5 3 5 3 Switch no 3 Digital Output Format Selection...

Page 6: ...iming J103 37 pin D connector 6 1 Status Control J104 25 pin D connector 6 2 RS 232 Port J105 6 2 Analog Audio Input J106 J107 6 2 6 2 RS 449 Interface Description 6 3 6 2 1 Functional Description 6 3...

Page 7: ...uts are provided A full duplex serial control system has also been implemented which allows the user to retrieve Status or Aux data from the decoder It is also possible for the user to update the unit...

Page 8: ...r 1 3 Dolby AC 3 and AC 2 Despite the low spectrum efficient data rate Dolby AC 3 and AC 2 yield very high audio quality and is suitable for the most demanding of professional and consumer distributio...

Page 9: ...kHz 44 1kHz or 48kHz Set by Encoder 112 kbps 32kHz 44 1kHz or 48kHz Set by Encoder 128 kbps 32kHz 44 1kHz or 48kHz Set by Encoder 160 kbps 32kHz 44 1kHz or 48kHz Set by Encoder 192 kbps 32kHz 44 1kHz...

Page 10: ...ou are qualified to do so WARNING Check that the correct fuses have been installed To reduce the risk of fire replace the fuses only with the same type and rating Exposed portions of the power supply...

Page 11: ...izionato sul valore corretto o Assicurarsi che la portata ed il tipo di fusibili siano quelli prescritti dalla casa costruttrice o L apparecchiatura deve avere un collegamento di messa a terra ben ese...

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Page 13: ...ility of low data rates permits efficient use of cable bandwidth as either a baseband signal or as a subcarrier above video 2 2 Telecommunications The Model DP524 can be used with T1 or ISDN lines for...

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Page 15: ...m its carton Remove the plastic wrapping and place on a flat surface If there are no signs of physical damage proceed to Fusing Information below 3 2 1 Claims for Shipping Damage If in your inspection...

Page 16: ...Settings The Model DP524 includes certain user selectable options that are configured by means of internal jumpers as shown below Their default settings shipped with the unit are shown in the figure...

Page 17: ...the top cover front panel assembly forward then away towards the rear Carefully set aside this sub assembly Reverse the above procedure when re assembling the unit S101 J200 DP524 MOTHERBOARD 1 ON OFF...

Page 18: ...link so that the audio ground is never totally isolated from the chassis ground To connect audio ground directly to chassis ground in the DP524 move jumper J3 to the closed position move jumper towar...

Page 19: ...to the incoming sample rate so that both the test tone and audio output have the same sample rate The frequency of the test tone varies somewhat with the sample rate chosen Output Sample Rate Frequen...

Page 20: ...on 3 5 4 Switch nos 4 5 6 Command Aux Data down Switch position determines whether the RS 232 port J105 is configured as an Aux Data output or is used for remote control Mode S101 4 Aux Data Down Comm...

Page 21: ...e rear panel connector on the DP524 is a BNC female connector rather than the typical phono jack normally encountered in S PDIF installations 4 2 2 AES EBU Output J101 Alternatively connect this outpu...

Page 22: ...ipment DTE and is typically connected to data circuit terminating equipment DCE such as telecommunications or RF modems Detailed information on the RS 449 interface is provided in Section 6 2 System C...

Page 23: ...s product 4 3 4 Parallel Status and Control J104 It is possible to remotely enable the Test Tone and Download functions By taking pin 19 of the J104 to 5V the Test Tone is enabled By taking pin 20 of...

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Page 25: ...e Test Tone Generator has been activated position 1 of rear panel DIP Switch S101 is up Mute The red Mute LED indicates that the unit is not currently able to recover valid audio This may because the...

Page 26: ...compatible format The downloading procedure is described below Remove all connectors to the DP524 except for the mains power Connect rear panel connector J105 to a standard PC serial port Note the po...

Page 27: ...tput J102 BNC type connector 0 5V p p typical 75 ohms Encoded Data In and Timing J103 37 pin D connector Pin Connection Pin Connection 1 Shield chassis ground 2 NC no connection 20 NC 3 NC 21 NC 4 NC...

Page 28: ...ND Digital ground 19 TEST IN Input Enable Test Tone 20 DOWNLOAD Input Enable Software Download 21 FAULT Output System Failure 22 TEST OUT Output Test Mode 23 MUTE Output Decoder Muted 24 NC Do Not Con...

Page 29: ...receives a data clock from a DCE device on the receive timing RT pins and receives data on the receive data RD pins The internal timing and sample clocks of the DP524 are phase locked to ST and RT res...

Page 30: ...be used to interconnect the units The special cable connects the TT outputs of the DP523 directly to the ST inputsof the DP523 and to the RT inputs of the DP524 This cable also connects the SD output...

Page 31: ...rupted then the unit responds with a single ASCII character x If the command is expecting a reply as in the case of Return Status then that status byte is returned The data sequence is as follows pref...

Page 32: ...he loaded algorithms The Index byte starts at 0 and is incremented until the unit returns a zero On each successive call the unit will return the following ASCII character in the associated null termi...

Page 33: ...sec 1 0 1 1 224k bits sec 1 1 0 0 256k bits sec 1 1 0 1 320k bits sec 1 1 1 0 384k bits sec 1 1 1 1 448k bits sec 6 3 2 AC 3 Related commands The following commands are only applicable to the AC 3 al...

Page 34: ...ta FD Where data is as follows B7 B6 B5 B4 B3 B2 B1 B0 0 0 0 0 0 0 C1 C0 C0 and C1 are defined as follows C1 C0 Comment 0 0 Custom mode no digital dialog normalization 0 1 Custom mode digital dialog n...

Page 35: ...an 120 dB 1 kHz Level Stability AC 2 Better than 0 2 dB AC 3 Better than 0 01 dB Audio Coding Method Dolby AC 2 or AC 33 Time Delay Varies with algorithm Contact Dolby Laboratories External Timing Ext...

Page 36: ...to 24dBm Full Scale Front Panel Indicators Signal Presence CH A Green indicates that a signal greater than 60dB FS is present on the channel A output Signal Presence CH B Green indicates that a signal...

Page 37: ...x 29 8 cm 8 5 pounds 3 9 kg approx Emissions Complies with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules Environmental Requirements Temperature Operating 0 oC to 50 oC...

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