公开(公告)号：WO1993014494A1

公开(公告)日：1993-07-22

申请号：PCT/US1993000458

申请日：1993-01-15

Applicant: ALESIS

Inventor： ALESIS ,  BARR, Keith ,  ZAK, Alan ,  RYLE, Marcus

IPC: G11B05/09

CPC classification number: G11B27/036 ,  G11B5/0086 ,  G11B20/1208 ,  G11B27/032 ,  G11B27/3027 ,  G11B27/3036 ,  G11B2020/10592 ,  G11B2220/90 ,  G11B2220/913

Abstract: A method and apparatus for recording multiple channels (305) of digital audio data onto one-half inch tape using a rotary head recorder. The tape format includes sector spaces (306) and a write timing sector (308) to provide reduced susceptibility to errors arising from head misalignment, provides improved punch-in and punch-out capabilities using overdub identification values (415) recorded within each channel of audio information, and provides a unique time code word (420) that facilitates accurate high-speed scan and search operations, as well as multiple device synchronization. Each pair of audio tracks (203) terminates with a write timing sector that serves as an absolute location marker for the rotary head, and allows the digital audio system to determine precise head location with respect to the tape.

Abstract translation: 一种使用旋转磁头记录器将数字音频数据的多个通道（305）记录到半英寸磁带上的方法和装置。 磁带格式包括扇区空间（306）和写定时扇区（308），以提供对由头部未对准引起的错误的敏感度降低，使用记录在每个通道的每个通道内的过量标识值（415）提供改进的穿透和打孔能力 音频信息，并且提供有助于精确的高速扫描和搜索操作以及多个设备同步的唯一时间码字（420）。 每对音轨（203）终止于用作旋转磁头的绝对位置标记的写定时扇区，并且允许数字音频系统确定相对于磁带的精确磁头位置。

公开(公告)号：WO1993014562A1

公开(公告)日：1993-07-22

申请号：PCT/US1993000460

申请日：1993-01-15

Applicant: ALESIS

Inventor： ALESIS ,  BARR, Keith ,  ZAK, Alan ,  RYLE, Marcus ,  BROWN, David ,  LAFKY, Carl

IPC: H03D03/24

CPC classification number: H04L7/10 ,  H04L7/0066 ,  H04L7/033 ,  H04L7/041

Abstract: A digital audio interface protocol carries multiple channels of digital audio information serially between a transmitting digital audio tape recorder and a plurality of receiving recording units. Using a three stage process, the circuitry of the present invention allows the receiving VCO's (708) to 'lock on' to the sampling rate of the serial digital data stream without any explicit sampling information. In a first stage, the VCO frequency is adjusted until a sync pattern is properly received. In a second stage, the VCO frequency is adjusted to oscillate a preselected number of times between sync pattern occurrences. In a third stage, the VCO phase is adjusted to match the phase of the serial data stream.

公开(公告)号：WO1993014496A1

公开(公告)日：1993-07-22

申请号：PCT/US1993000453

申请日：1993-01-15

Applicant: ALESIS

Inventor： ALESIS ,  BARR, Keith ,  ZAK, Alan ,  RYLE, Marcus ,  BROWN, David

IPC: G11B05/86

CPC classification number: G11B27/10 ,  G11B27/002 ,  G11B27/032 ,  G11B27/3036 ,  G11B2220/90 ,  G11B2220/913

Abstract: A method for synchronously operating two or more rotary head digital audio tape recorders without having to dedicate a separate timing track. The present invention synchronizes the machines in three steps. First, the slave unit reads the time code (111) value from the data stream and compares this time code (111) to the master's time code (111) examining the difference in time code (111) values and adjusting the transport speed so that the values are approximately equal. Next, the slave's capstan motors are slowed down (or sped up) so that the slave and master units are within one drum revolution of each other. Finally, the slave's microprocessor adjusts the speed of the entire system to skip individual samples until the master and slave units are synchronized.

Abstract translation: 一种用于同时操作两个或更多个旋转磁头数字音频磁带录像机的方法，而不必专用单独的定时轨道。 本发明在三个步骤中同步机器。 首先，从单元从数据流中读取时间码（111）值，并将该时间码（111）与主时间码（111）进行比较，检查时间码（111）的差值，调整传送速度，使得 值大致相等。 接下来，从机的主导轴电机减慢（或加速），从而从机和主机在彼此的一个转鼓内。 最后，从站的微处理器调整整个系统的速度，以跳过各个采样，直到主站和从站单元同步。