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Every effort has been made to assure the accuracy of the information contained in this manual, and the reliability of the Alcorn McBride Digital Audio Machine hardware and software. Errors can sometimes go undetected, however. If you find one, please bring it to our attention so that we can correct it for others. Alcorn McBride welcomes comments and suggestions on the content and layout of its documentation. Applications described herein are for illustrative purposes only. Alcorn McBride Inc.
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:HOFRPH Thanks for purchasing The Alcorn McBride Digital Audio Machine™. The Digital Audio Machine replaces tape machines, CDs and solid state audio players in permanent audio playback installations, providing hours of high-quality, maintenance-free digital audio. Any 16-bit 44.1 Khz WAV file, stereo or mono, may be played. This format is not compatible with the MPEG Layer-2 Audio format of the Model AM-2.
&RQWUROV DQG ,QGLFDWRUV The Digital Audio Machine provides controls that can accommodate a wide variety of installations. The front panel incorporates a test switch, status indicator, PC-Card slot and serial port. The rear panel provides the audio, digital audio and control connectors: P ow er 15 VD C M in 1 A M ax - R igh t + C o ntro l Le ft Test Button The Test Button always plays the lowest numbered track. A recessed push-button is located on the front of the unit.
Ground Lift Be sure to configure the Digital Audio Machine’s switches before rack mounting the units, or the switches may be inaccessible. In the event of AC hum or noise, this switch, located at the rear of the left side of the Digital Audio Machine, may be opened to isolate the Digital Audio Machine’s ground from its chassis.
Control Connector Be sure to configure the Digital Audio Machine for contact closures or voltage inputs before connecting any wires. This connector provides all of the signals needed to interface to the Digital Audio Machine. In addition to serial control, the first fifteen files of the Digital Audio Machine may be played, paused or stopped using eight parallel inputs located on the rear connector.
3DUDOOHO &RQWURO Parallel Inputs Be sure to configure the slide switch before connecting any wires. The Digital Audio Machine can be controlled using either contact closures or voltage inputs on the female DB-37 Control Connector. A switch located on the side of the unit next to the connector selects between the two input types. Voltage inputs are rated for 24 VDC. Consult factory for other voltage options. The table below describes the function of each input.
The table below shows the binary combinations possible, and what file they select: 8 4 2 1 File Off Off Off Off None Off Off Off On 1 Off Off On Off 2 Off Off On On 3 Off On Off Off 4 Off On Off On 5 Off On On Off 6 Off On On On 7 On Off Off Off 8 On Off Off On 9 On Off On Off 10 On Off On On 11 On On Off Off 12 On On Off On 13 On On On Off 14 On On On On 15 For example, connecting pins 8 and 27 together with the slide swi
Using a terminal block to hold the diodes makes the wiring neater.
Parallel Outputs Two status outputs are provided. They are dry contact closures rated at 24 VDC and 0.9 amp max. Their function is described below. Function Pins Description Playing 9,28 Closed when the unit is playing. Fault 10,29 Closed when the unit detects a fault condition. 6LPSOH 6HULDO &RQWURO The Digital Audio Machine may be controlled using serial RS-232 messages via either the front DB-9 Programming Connector or the rear DB-37 Control Connector.
Command Bytes: Message Response: Comments: Examples: Play command causes the specified file to play from the beginning. The unit defaults to file #1 at power-up, unless an autoexec file exists. When receiving this command, the Digital Audio Machine always looks for the file on the currently selected drive. nSE or nnSE or nnnSE where n, nn, or nnn is the file number in ASCII. R This is similar to the “Search to Address” command in chapter addressing mode used in Pioneer Laser Disc protocol.
)LOH 1DPHV File names are represented in simple DOS 8.3 format – in other words, an eight character name, a period, and then a three character extension. The name is made up of eight characters specifying the type (SND for sound file, PLY for Play List, CMD for command), and the number of the file (5 digits from 00000 to 00511). The three character extension is used to tell the Digital Audio Machine the data format of the file.
3OD\ /LVWV Play Lists provide a mechanism for the Digital Audio Machine to automatically play a collection of tracks in a predefined sequence. Play Lists often allow the Digital Audio Machine to be used to perform complex functions that would normally require an external controller. Play Lists can perform functions as simple as looping a single track, or as complex as user prompted pacing of the playback. Overview Play Lists hold the key to the power of the Digital Audio Machine.
Char Meaning L Loop next track. The track loops until the Resume input is activated or a serial play command is received, whereupon the next entry in the Play List is played. W Wait. Play stops at the end of current track until the Resume input is activated or a serial play command is received, whereupon the next entry in the Play List is played. U Uninterruptible. Causes the Digital Audio Machine to ignore the Resume input and serial Play command while playing.
Example Play List i,1,L6,37,w,415,5,60 < The Play List is a list of numbers representing the file numbers of audio tracks. The list can also contain special control codes or symbols to govern playback. The list can be arranged all on the same line, as shown above, or vertically as shown below. i 1 L6 37 w 5 60 < ;You can comment your Play List file by using ;semicolons. All text after a semicolon is ;ignored until the end of the line where a ;carriage return is encountered.
The first condition detected will be processed. Successive conditions are ignored. If more than one file has the same number, the first file found will be used. &RPPDQG )LOHV Command files are used only in units equipped with the optional internal drive. To permanently update the contents of the internal drive from the PC-Card slot, use a Command File.
Delete File "xxxxxxxx.xxx"DL Rename File "xxxxxxxx.xxx" "yyyyyyyy.yyy"RN Copy File, Removable to Internal "xxxxxxxx.xxx"CI Copy File, Internal to Removable "xxxxxxxx.
7URXEOHVKRRWLQJ *XLGH Q: I’ve copied several files from my PC onto a PCMCIA drive, but they do not appear in DVM Explorer. A: The PCMCIA drive may have been pre-formatted in a way which is incompatible with the AM-3 operating system. Use DVM Explorer to format the media, and then re-copy the files. Q: DVM Explorer shows a red circle in front of the file name. What does this mean? A: The file name does not follow the naming conventions outlined in this manual for video files.
0HFKDQLFDO ,QIRUPDWLRQ Strain Relief The rear panel of the Digital Audio Machine incorporates four threaded PEM nuts, which can be used to secure strain reliefs to prevent cables from being dislodged from their connectors. The PEM nuts accept 4-40 screws, with a length not to exceed 3/8 inches. Surface Mounting 6XUIDFH 0RXQW .
Rack Mounting Rack mounting the Digital Audio Machine is as simple as attaching top and bottom connecting plates to the sides (if more than one unit is to be connected together) and then adding the appropriate length rack mount ears, as shown in the drawings that follow. 5DFN 0RXQW .
5DFN 0RXQW .LW 8QLW 3DUW 1XPEHU Qty 1 1 1 1 2 6 8 Part Number 306-100007 306-100082 306-100080 306-100081 500-000565 500-000564 500-000540 Description Mounting Ear, Short Mounting Ear, Medium Connecting Plate, Top Connecting Plate, Bottom Screw, 4-40 x 1, Pan Head, Black Ox, CRES Screw, 6-32 x 3/8, Flat Head, Black Ox, CRES Screw, 10-32 x ¼, Pan Head, Black Ox, CRES 5DFN 0RXQW .
6SHFLILFDWLRQV Audio DAC Resolution: Deviation from Linear phase: Total Harmonic Distortion: Dynamic Range (A-weighted): Inter-channel Isolation: Interchannel Gain Mismatch: Frequency Response: Maximum Phase Non-Linearity: Output Level: Analog Output Load: 16 bits +/-0.5dB 0.003% 94dB 90dB 0.1dB 10 to 20 Khz +/- 0.1 dB 5 degrees Unbalanced, 4.07V P-P max (3.70 typical) into 20K 10K Ohm Minimum, 100pF Maximum Playback Time Approximately 3 hours stereo from an optional internal 2GB drive.
,QGH[ Advertising, 9 autoexec, 9, 12, 13 baud, 11 Command Bytes, 12, 18 Command File, 17 comments, 12, 18 Connectors, 6, 22 contact closures, 10, 11 Contact Closures, 7–8 copy, 18 DAC, 22 DB-37, 8, 11 DB-9, 6, 11 Delete, 18 Directory, 18 Distortion, 22 DOS, 13 Dynamic Range, 22 error codes, 18 Fault, 5, 7, 11 file extension, 13 File names, 13 File Select, 7 Firmware Version, 18 Format, 18 Frequency Response, 22 Gain, 22 hum, 6 internal, 6, 9 Interruptible, 15 laser disc, 12 LED, 5 LED Meaning, 5 Loop, 7–9,
