公开(公告)号：JPH0831056A

公开(公告)日：1996-02-02

申请号：JP17950394

申请日：1994-07-06

Applicant: SONY CORP

Inventor： SAWATANI TAKU

IPC: G11B15/46 ,  G11B15/087

Abstract: PURPOSE:To find a tape traveling speed without misjudgment by comparing a difference signal outputted out of a subtraction circuit with a prescribed threshold and measuring the number of pulses to be obtained based on a comparing result. CONSTITUTION:After a reproducing output S1 is amplified by an amplifier 4, only a reproducing pilot signal S2 is passed by an LPF 5. Then, this signal is multiplied by a reference pilot signal S3 by a balanced modulator 6 to obtain a balanced modulation output S4. Subsequently, the output S4 is inputted to a BPFs 7 and 8, and error signals 35 and S6 outputted from detectors 9 and 10 are inputted to a subtractor 11. Then, an ATF error signal S7 outputted by the subtractor 11 is given to an LPF 12, and the signal after removing its high frequency component is waveform-shaped by a zero cross comparator 13 to obtain a detecting pulse S8, which is then counted by a counter 14, and the number of pulses S9 per unit time is compared with a constant S10 by a comparator 15 to obtain a discriminating result S11. Consequently, even when an amplitude of the signal S7 is fluctuated, a traveling mode can be discriminated with high accuracy.

公开(公告)号：JPH06105382A

公开(公告)日：1994-04-15

申请号：JP27365892

申请日：1992-09-17

Applicant: SONY CORP

Inventor： SAWATANI TAKU ,  AINE TOMONARI ,  URUSHIDO HIROSHI ,  MASUDA TAKASHI

IPC: H04B1/06 ,  H04B10/00 ,  H04B10/114 ,  H04Q9/00

Abstract: PURPOSE:To allow a decoder to decode a remote control signal with respect to plural remote control light receiving sections. CONSTITUTION:The DEVICE is provided with plural light receiving sections 11-1n to receive a remote control signal. A switch circuit 20 selects one of plural light receiving outputs of the sections 11-1n, and is provided with a switching signal generating means 3, which generates a switching signal SE to obtain sequentially plural light receiving outputs through the sequential changeover of the switch circuit 20 and also with a signal detection means 32 detecting whether or not an output signal of the switch circuit 20 includes a specific pattern. When the signal detection means 32 detects it that the output signal of the switching circuit 20 includes a specific pattern, the switching signal SE is controlled to be held at that time. An output signal of the switching circuit is decoded by a decode means 31 to obtain a decoded output of the remote control signal.