SMPTE RP 171-1993 Type-Specific Messages for Digital Control Interface of Analog Audio Tape Recorders.pdf

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1、SMPTE RP*L7L 73 m 8357YL 00003bb LOB m SMPTE RECOMMENDED PRACTICE Type-Specific Messages for Digital Control Interface of Analog Audio Tape Recorders RP 171-1993 Page i of 34 pages 1 Scope This practice details and defines the type-specific messages used for the control of analog audio tape recorder

2、 devices. These type-specific messages provide the means for the control and monitoring of a specific type of virtual machine and are implemented within an architectre of a greater control message language. 2 General 2.1 Virtual machine type Analog audiotape recorders shall beidentied as a as an 8-b

3、it word, in hexadecimal form. 2.2 Notation rirtual machine of atype whichis uniquely coded as “03,” expressed This practice describes the keyword coding, naming conventions and its argument constructs in a form as shown below. The coding ”NN“ represents the assigned keyword code, expressed as an 8-b

4、t word, in hexadecimal form. NN KEYWORD Keyword or ItF descriptive text or I/F NAME Format: Parameter description; . Parameter value coding, scale or range: Parameter definitions and explanations. .ln the practices listed in annex BI keywords are listed numerically, in hexadecimal notation. Keywords

5、 numbering 40h - FFh are reserved for the type-specific, virtual machine subsets. The type-specific messages for the ATR are contained within this subset. 2.2.1 Command classifications All tape motion state commands are indicated by the command classification “TMS.” Each TMS command causes a transit

6、ion into a transport state. These states are mutually exclusive. Tape motion process commands are indicated by the command classification “TMP.” Tape motion processes are overriding control commands that cause the controlled device to automatically choose its own tape motion states to achieve the de

7、sired result. The tape motion state will be reflected in theTMS tally, as though that TMS command had been issued. TMPs are mutually exclusive. Copyright O 1993 by the SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 Approved July 1,1993 (91 4) 761-1 1

8、 O0 SUPTE RPM373 93 pil 8357403 O000367 044 I RP 171-1993 All audio record commands are indicated by the command classification “ARC.” ARC commands affect the manner in which tracks are selected and subsequently sequenced through record entries and exits. All audio monitor commands are indicated by

9、the command classification “AMC.” AMC commands affect the manner in which audio line output source selections are made. 2.2.2 Resewed keywords All keyword codes listed as “reserved are specifically retained for the expansion of the range of compatible message usage between ATR and VTR type-specific

10、devices. 3 Index of keywords 3.1 Numerical index of keywords, mnemonics, and information field names Commands which have a related information field for tally purposes are identified by a of the index listing. sign within the body Message keywords Mnemonic I/F field names Mnemonic 40 TMS 41 TMS 42 T

11、MS 43 TMS 44 TMS 45 TMS 46 47 48 49 ARC 4A ARC 48 ARC 4C 4D TMP 4E TMP 4F TMS 50 TMS 51 TMP 52 TMP 53 54 55 56 57 TMS 58 59 5A 5B 5c 5D 5E 5F not used STOP VARIABLE PLAY PLAY STEP AUDIBLE FAST SHUTTLE not used reserved CAPSTAN REFERENCE SELECT REHEARSE SELECT RECORD STROBE RECORD EXIT TAPE CODE SELE

12、CT TARGET SEARCH SYNC PREROLL SEARCH SYNC LOCK LOCK PREROLL SEARCH CHASE reserved reserved reserved reserved TAPE RELEASE FIXED SPEED SELECT not used not used not used not used not used not used 40 STOP 41 VAPL 42 STPL 43 STEP 44 AFST 45 SHUT 46 47 48 CAPS 49 REMS 4A RSTB 48 REEX 4c TACS 4D TASE 4E

13、SPRS 4F SYNC 50 LOCK 51 LPRS 52 CHAS 53 54 55 56 57 FISS 59 5A 5B 5c 5D 5E 5F TARL 58 not used INTERNAL LTC not used SELECTED TAPE CODE INTERNAL LTC USERBIT not used TAPE TIMER not used reserved CAPSTAN REFERENCE TALLY REHEARSE TALLY CHANNEL RECORD STATUS not used TAPE CODE SELECTION TALLY SYNC VELO

14、CITY PREROLL DURATION SYNC POINT LOCK TIME not used not used reserved reserved reserved reserved not used FIXED SPEED TALLY TAPELENGTH not used SYNC LOCK ACCURACY LOCK DEVIATION not used not used I NTC SETC INUB TAT I CRET REHT CRES TACT SVTY PRDU SPNT LKTT FIST TLTH S LAC LKDE Page 2 of 34 pages SM

15、PTE RP*i173 93 W 8357403 O000368 T8O W 60 TMS 61 TMS 62 63 ARC 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 AMC 71 AMC 72 AMC 73 74 75 76 77 78 79 7A 78 7c PRESET FAST FORWARD FASTREVERSE not used RECORD READY SELECT not used AUTO ATTENUATE SELECT LIFTER DEFEAT SELECT not used not used not used- not used

16、not used not used not used not used LOCK MODE SELECT GLOBAL MONITOR SELECT EXCLUSIVE SYNC SELECT SYNC INPUT SELECT not used not used not used not used not used not used LOCAL LOCKOUT SELECT not used PLAY MODE SELECT PRST 60 FFOR 61 FREV 62 63 RECS 64 65 AUAS 66 TLDS 67 68 69 6A 6B 6C 6D 6E 6F LKMS 7

17、0 MONS 71 ESYS 72 SYIS 73 74 75 76 77 78 79 LLOS 7A 7B PLMS 7c TMP TALLY TMS TALLY VELOCITY TALLY not used RECORD READY TALLY not used AUTO ATTENUATE TALLY LIFTER DEFEAT TALLY reserved reserved reserved reserved reserved reserved reserved reserved LOCK MODE TALLY GLOBAL MONITOR TALLY EXCLUSIVE SYNC

18、TALLY SYNC INPUT TALLY EXTERNAL TIME CODE EXTERNAL USERBITS SLEW RATE REQUESTED OFFSET ACTUAL OFFSET STRIDE LENGTH LOCAL LOCKOUT TALLY TIME CODE ATTRIBUTES PLAY MODE TALLY RP 171-1993 TMPT TMST VELT RECT AUAT TLDT LKMT MONT ESYT SY IT EXTC EXUB . SLRT ROFT AOFT STLT LLOT TCAT PLMT . 3.2 Functional i

19、ndex of keywords, mnemonics, and information field names Commands which have a related information field for tally purposes are identified by brackets within the body of the index listing. Message keywords Mnemonic I/F field names System utility Mnemonic 7A LOCAL LOCKOUT SELECT LLOS 7A LOCAL LOCKOUT

20、 TALLY LLOT Tape motion procedures (TMP) 4E TARGET SEARCH TASE 4F SYNC PREROLL SEARCH SPRS 60 TMP TALLY 52 LOCK PREROLL SEARCH LPRS I 53 CHASE CHAS I TMPT Page 3 of 34 pages SMPTE RP*171 93 m 8357401 0000369 917 m RP 171-1993 Tape motion states (TMS) 41 STOP 58 TAPE RELEASE 43 PLAY 61 FAST FORWARD 6

21、2 FAST REVERSE 44 STEP 42 VARIABLE PLAY 45 AUDIBLE FAST 46 SHUTTLE 51 SYNC 51 LOCK STOP 61 TARL STPL I FFOR I FREV 62 STEP I VAPL I AFST I SHUT I SYNC I LOCK 1 Tape motion references 59 FIXED SPEED SELECT FISS 59 49 CAPSTAN REFERENCE SELECT CAPS 49 60 PRESET PRST 79 Synchronization parameters 70 LOC

22、K MODE SELECT LKMS 70 7C PLAY MODE SELECT PLMS 7C I 51 I 51 I 4E I 77 I 5c 60 PRESET PRST 4D 60 PRESET PRST 46* 41 * 43 * 74 * Position and time code utilities 60 PRESET TMP TALLY VELOCITY TALLY TMST VELT FIXED SPEED TALLY FIST CAPSTAN REFERENCE TALLY CRET STRIDE LENGTH LOCK MODE TALLY PLAY MODE TAL

23、LY SYNC POINT LOCK TIME SYNC VELOCITY , PREROLL DURATION REQUESTED OFFSET SYNCILOCK ACCURACY SLEW RATE ACTUAL OFFSET LOCK DEVIATION STLT LKMT PLMT SPNT LKTT SVTY PRDU RO FT suc SLRT AOFT LKDE TAPE CODE SELECT TALLY TACT TAPE TIMER TAT I INTERNAL LTC I NTC SELECTED TAPE CODE SETC EXTERNAL TIME CODE E

24、XTC * = Time I/Fs wh,ich may be used as event triggers. PRST 5A TAPE LENGTH TLTH 78 TIME CODE ATTRIBUTES TCAT 44 INTERNAL LTC USERBITS INUB 75 EXTERNAL USERBITS EXUB Page 4 of 34 pages SMPTE RP*37L 93 m 8357403 0000370 639 m Audio record control (ARC) 64 RECORD READY SELECT RECS 64 4A REHEARSE SELEC

25、T REMS 4A 48 RECORD STROBE RSTB 48 4C RECORD EXIT REEX I Audio monitor control (AMC) 71 GLOBAL MONITOR SELECT MONS 71 72 EXCLUSIVE SYNC SELECT ESYS 72 73 SYNC INPUT SELECT SYIS 73 66 AUTO ATTENUATE SELECT AUAS 66 67 LIFTER DEFEAT SELECT TLDS 67 4 Keywords, definitions, and syntax 40 41 42 not used S

26、TOP Format: VARIABLE PLAY Format: RP 171-1993 RECORD READY TALLY RECT REHT REHEARSE TALLY CHANNEL RECORD STATUS CRES GLOBAL MONITOR TALLY MONT EXCLUSIVE SYNC TALLY ESYT SYNC INPUT TALLY SYIT AUTO ATTENUATE TALLY AUAT LIFTER DEFEAT TALLY TLDT (TMS) Causes the controlled ATR to stop as soon as possibl

27、e; all recording tracks are automatically exited from record operation prior to execution. (TMS) Causes the controlled ATR to enter capstan- controlled variable forward playback mode with specified velocity relative to the FIXED SPEED. If the controlled ATR is recording, all recording tracks will ex

28、it record mode. 3-byte signed binary number: twos complement scale: OOOOOOh = stationary 01OOOOh = fixed speed forward 7FOOOOh = approximately 127 times standard fixed speed forward FFOOOOh = fixed speed reverse 800000h = 128 times fixed speed reverse NOTE -Argument does not imply resolution of a co

29、ntrolled device. 43 STDPLAY (TMS) Causes the controlled ATR to enter playback at the speed determined by the value in the FIXED SPEED I/F. If the controlled ATR is recording, all recording tracks will exit record mode. Format: Page 5 of 34 pages - SMPTE RP*L7L 93 El 8357401 000037L 575 B RP 171-1993

30、 44 45 46 47 48 49 STEP Format: AUDIBLE FAST Format: SHUTTLE Format: (TMC) Causes the controlled ATR to move the tape a specified number of STRIDE LENGTHS forward or backward, with respect to its current position, only while in STOP or STEP. Successive commands are cumulative until next TMS or TMP (

31、other than STEP). The number argument refers to the quantity and direction of STRIDE PERIODS of tape movement requested. The longitudinal STRIDE LENGTH is defined in the STRIDE LENGTH I/F. 1 -byte signed number: range: -127 . t127 (TMS ) Causes the controlled ATR to enter fast tape motion with audib

32、le but not necessarily broadcastable audio at specified direction and velocity relative to the FIXED SPEED. All recording tracks are automatically exited from record operation prior to execution. 3-byte signed binary number; same format as in VARIABLE PLAY. (TMS) Causes the controlled ATR to travel

33、at specified direction and velocity relative to FIXED SPEED without necessarily reproducing audio. All recording tracks are automatically exited from record operation prior to execution. 3-byte signed binary number; same format as in VARIABLE PLAY. not used reserved CAPSTAN REFERENCE SELECT Causes t

34、he controlled ATR to select a capstan reference. This command is meaningful only when not in CHASE TMP, SYNC, or LOCK TMS. These operations will cause a return to the default selection. Format: 1 -byte special binary code: ooh = internal crystal (= default) O1 h = external capstan reference input FF

35、h = as selected locally Page 6 of 34 pages SMPTE RP*171 93 8357401 0000372 401 W RP 171-1993 4A REHEARSE SELECT (ARC) During all subsequent record entries and exits, related line-out switching functions will mimic record operation as defined by the SYNC-INPUT SELECT I/F without actually erasing or a

36、pplying bias and audio signal to tape. Format: 1 -byte special binary code: OOh = rehearse true (default) 04h = rehearse true FFh = as selected locally else = record enabled 48 RECORD STROBE (ARC) Causes record entry on the presently RECORD READY enabled track); causes record exit on any currently r

37、ecording track) that are RECORD READY disabled. Format: 4C RECORD EXIT (ARC) Causes a record exit on all currently recording track(s). Format: 4D TAPE CODE SELECT Format: Selects the source of code for all succeeding messages that refer to the SELECTED TAPE CODE. 1 -byte special binary code: OOh = i

38、nternai time code (= default) 01h = reserved 0211 = tape timer 03h = reserved 0411 = reserved FFh = as selected locally 4E TARGET SEARCH (TMP) Causes the controlled ATR to move to a defined tape position in accordance with the TAPE CODE SELECT. Format: (type TIME) NOTE - The SELECTED TAPE CODE refer

39、ence is selected by the command TAPE CODE SELECT. Page 7 of 34 pages SMPTE RP*LL 93 rn 357401 0000373 348 RP 171-1993 4F 50 51 52 SYNC PREROLL SEARCH (TMP) Causes the controlled ATR to move to the SELECTED TAPE CODE tape position determined by the PREROLL DURATION I/F minus any device- specific acce

40、leration allowance in advance of the SYNC POINT I/F. All recording tracks are automatically exited from record operation prior to execution. Format: SYNC (TMS) This command is styled to follow the functional intent of the VTR dialect SYNC command. When issued, causes the controlled device to immedia

41、tely establish synchronism with the selected TIMELINE SOURCE. NOTES 1 The controlled device will synchronize with the above-selected reference at the prescribed SYNC POINT with the prescribed SYNC VELOCITY precisely at the prescribed PREROLL DURATION after either the “immediate” reception or “EVENT”

42、 reception of this keycode. 2 It is essential that the selected TIMELINE SOURCE is incrementing in a real time manner at the delivery time of the command during the PREROLL DURATION and throughout the remainder of the SYNC operation. 3 PREROLL DURATION and SYNC POINT I/Fs must be predefined before b

43、oth SYNC PREROLL SEARCH and SYNC command execution. The controlled device must be cued to the correct preroll position before execution. 4 This command establishes synchronism independently of any previous preset REQUESTED OFFSET, as the offset at the instant of SYNC POINT is dependent upon the time

44、 of the commands delivery and the prescribed SYNC VELOCITY. As a function of SYNC operation, REQUESTED OFFSET may continuously be changed in order to maintain SYNC VELOCITY conformance relative to the selected TIMELINE SOURCE. Format: LOCK Format: CLOCK (TMS) When isssued, causes the controlled ATR

45、to establish synchronism in a manner as defined by the LOCK MODE I/F. Causes a LOCK PREROLL SEARCH operation should the controlled device not be cued to the correct prerolled position. NOTE - PREROLL DURATION, REQUIRED OFFSET, and LOCK TIME I/Fs must be predefined before LOCK execution. LOCK PREROLL

46、 SEARCH (TMP) Causes the controlled ATR to move to the SELECTED TAPE CODE tape position determined by the PREROLL DURATION I/F minus any device- specific acceleration allowance in advance of the REQUESTED OFFSET adjusted LOCK TIME I/F. All recording tracks are automatically exited from record operat

47、ion prior to execution. Format: Page 8 of 34 pages SMPTE RP*l171 93 = 8357401 0000374 284 = 53 CHASE Format: 54 reserved 55 reserved 56 reserved 57 reserved 58 TAPE RELEASE Format: 59 FIXED SPEED SELECT Format: 5A not used 5B not used 5C not used 5D not used 5E not used 5F not used RP 171-1993 (TMP)

48、 Causes the controlled device to attempt to follow, establish, and maintain synchronism with the EXTERNAL TIME CODE. Synchronism is established and maintained in a data-dependent manner. All recording tracks are automatically exited from record operation prior to any noncapstan servoed follow action

49、. (TMS) Releases the tape tension mechanism of the controlled ATR. All recording tracks are automatically exited from record operation prior to execution. This TMS is reset by STOP. Causes the controlled device to select the nominal tape speed. 1 -byte special binary code: loh = 1.875 ips 4.7625 Cm/S 20h = 3.750 ips 9.525 Cm/S 37h = 9.606 ips 24.40 Cm/S 3011 = 7,500 ips 19.05 cm/s 40h = 15.00 ips 38.10 cm/s 50h = 30.00 ips 76.20 cm/s FFh = as selected locally Page 9 of 34 pages SMPTE RP8171 93 H 8357491 0000375 110 RP 171-1993 60 PRESET Presets the named information field