Still mode video signal reproducing apparatus

Claim 1

An apparatus for reproducing video signals recorded on tracks which are obliquely formed on a tape, comprising: at least two main rotary heads having different azimuth angles with respect to each other for scanning said tracks; an auxiliary rotary head having the same azimuth angle as that of one of said main rotary heads, said auxiliary rotary head being disposed to substantially scan the same track as that scanned by said one of the main rotary heads; motor means for driving said tape; tape driving means for controlling said motor means to intermittently drive the tape during a slow motion reproduction mode by an amount corresponding to a predetermined number of said tracks during each of a plurality of predetermined time intervals; and head control means for controlling the operation of said main rotary heads and said auxiliary rotary head such that said video signals are reproduced by said one of the main rotary heads and said auxiliary rotary head having the same azimuth angle when said tape is stopped, and the video signals are reproduced by said main rotary heads during movement of said tape.

Claim 2

An apparatus for reproducing video signals recorded on tracks which are obliquely formed on a tape, comprising: at least two main rotary heads having different azimuth angles with respect to each other for scanning said tracks; an auxiliary rotary head having the same azimuth angle as that of one of said main rotary heads, said auxiliary rotary head being disposed to substantially scan the same track as that scanned by said one of the main rotary heads; motor means for driving said tape; tape driving means for controlling said motor means to intermittently drive the tape during a slow motion reproduction mode by an amount corresponding to a predetermined number of said tracks during each of a plurality of predetermined time intervals; and head control means for controlling the operation of said main rotary heads and said auxiliary rotary head such that said video signals are reproduced by said one of the main rotary heads and said auxiliary rotary head having the same azimuth angle when said tape is stopped, and the video signals are reproduced by said main rotary heads during movement of said tape.

Claim 6

An apparatus for reproducing video signals recorded on tracks which are obliquely formed on a tape, comprising: at least two main rotary heads having different azimuth angles with respect to each other for scanning said tracks; an auxiliary rotary head having the same azimuth angle as that of one of said main rotary heads, said auxiliary rotary head being disposed to substantially scan the same track as that scanned by said one of the main rotary heads; a tape capstan motor for driving said tape; tape driving means for controlling said tape capstan motor to intermittently drive the tape by an amount corresponding to a predetermined number of said tracks during each of a plurality of predetermined time intervals, said tape driving means including a drive pulse generating circuit for generating a motor drive pulse in response to a head switching pulse and having first monostable multivibrator means for determining the interval of said drive pulse in accordance with a slow-motion playback ratio, a brake pulse generating circuit for generating a motor brake pulse in response to a control signal reproduced from said tape, said tape being intermittently driven by alternately supplying said motor drive pulse and said motor brake pulse to said tape capstan motor, and flip-flop means responsive to said first monostable multivibrator means and to said motor brake pulse for producing a gate signal; and gate means receiving said control signal and said gate signal for feeding said control signal to said brake pulse generating circuit during each drive pulse interval; and head control means for controlling the operation of said main rotary heads and said auxiliary rotary head such that said video signals are reproduced by said one of the main rotary heads and said auxiliary rotary head when said tape is stopped, and the video signals are reproduced by said main rotary heads during movement of said tape.

Claim 7

An apparatus for reproducing video signals recorded on tracks which are obliquely formed on a tape, comprising: at least two main rotary heads having different azimuth angles with respect to each other for scanning said tracks; an auxiliary rotary head having the same azimuth angle as that of one of said main rotary heads, said auxiliary rotary head being disposed to substantially scan the same track as that scanned by said one of the main rotary heads; a tape capstan motor for driving said tape; tape driving means for controlling said tape capstan motor to intermittently drive the tape by an amount corresponding to a predetermined number of said tracks during each of a plurality of predetermined time intervals, said tape driving means including a drive pulse generating circuit for generating a motor drive pulse in response to a head switching pulse and having first monostable multivibrator means for determining the interval of said drive pulse in accordance with a slow-motion playback ratio, a brake pulse generating circuit for generating a motor brake pulse in response to a control signal reproduced from said tape, said tape being intermittently driven by alternately supplying said motor drive pulse and said motor brake pulse to said tape capstan motor, and flip-flop means responsive to said first monostable multivibrator means and to said motor brake pulse for producing a gate signal; and gate means receiving said control signal and said gate signal for feeding said control signal to said brake pulse generating circuit during each drive pulse interval; and head control means for controlling the operation of said main rotary heads and said auxiliary rotary head such that said video signals are reproduced by said one of the main rotary heads and said auxiliary rotary head when said tape is stopped, and the video signals are reproduced by said main rotary heads during movement of said tape.

Claim 9

An apparatus for reproducing video signals recorded on tracks which are obliquely formed on a tape, comprising: at least two main rotary heads having different azimuth angles with respect to each other for scanning said tracks; an auxiliary rotary head having the same azimuth angle as that of one of said main rotary heads, said auxiliary rotary head being disposed to substantially scan the same track as that scanned by said one of the main rotary heads; a tape capstan motor for driving said tape; tape driving means for controlling said tape capstan motor to intermittently drive the tape by an amount corresponding to a predetermined number of said tracks during each of a plurality of predetermined time intervals, said tape driving means including a drive pulse generating circuit for generating a motor drive pulse in response to a head switching pulse and having first monostable multivibrator means for determining the interval of said drive pulse in accordance with a slow-motion playback ratio, and a brake pulse generating circuit for generating a motor brake pulse in response to a control signal reproduced from said tape, said tape being intermittently driven by alternately supplying said motor drive pulse and said motor brake pulse to said tape capstan motor; and head control means for controlling the operation of said main rotary heads and said auxiliary rotary head such that said video signals are reproduced by said one of the main rotary heads and said auxiliary rotary head when said tape is stopped, and the video signals are reproduced by said main rotary heads during movement of said tape, said head control means including a first switch circuit which switches one of the outputs from said other of said main rotary heads and said auxiliary rotary head in response to a switching signal, a second switch circuit which switches one of the outputs of said one of said main rotary heads and said first switch circuit in response to said head switching pulse, a switching signal generating circuit having third monostable multi-vibrator means connected to said drive pulse generating circuit for generating a signal indicative of movement of the tape, and second gate means receiving said indicative signal and said head switching pulse for producing said switching signal indicating a duration wherein said other of said main rotary heads should be switched.

Claim 10

An apparatus for reproducing video signals recorded on tracks which are obliquely formed on a tape, comprising: at least two main rotary heads having different azimuth angles with respect to each other for scanning said tracks; an auxiliary rotary head having the same azimuth angle as that of one of said main rotary heads, said auxiliary rotary head being disposed to substantially scan the same track as that scanned by said one of the main rotary heads; a tape capstan motor for driving said tape; tape driving means for controlling said tape capstan motor to intermittently drive the tape by an amount corresponding to a predetermined number of said tracks during each of a plurality of predetermined time intervals, said tape driving means including a drive pulse generating circuit for generating a motor drive pulse in response to a head switching pulse and having first monostable multivibrator means for determining the interval of said drive pulse in accordance with a slow-motion playback ratio, and a brake pulse generating circuit for generating a motor brake pulse in response to a control signal reproduced from said tape, said tape being intermittently driven by alternately supplying said motor drive pulse and said motor brake pulse to said tape capstan motor; and head control means for controlling the operation of said main rotary heads and said auxiliary rotary head such that said video signals are reproduced by said one of the main rotary heads and said auxiliary rotary head when said tape is stopped, and the video signals are reproduced by said main rotary heads during movement of said tape, said head control means including a first switch circuit which switches one of the outputs from said other of said main rotary heads and said auxiliary rotary head in response to a switching signal, a second switch circuit which switches one of the outputs of said one of said main rotary heads and said first switch circuit in response to said head switching pulse, a switching signal generating circuit having third monostable multi-vibrator means connected to said drive pulse generating circuit for generating a signal indicative of movement of the tape, and second gate means receiving said indicative signal and said head switching pulse for producing said switching signal indicating a duration wherein said other of said main rotary heads should be switched.